17699( 5) - 09-Dec-2025 18:47:07 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17699 Version: 5 Check-in Time: 09-Dec-2025 18:47:07 STScI Edit Number: 2 Title Can Lyman-alpha transits quantitatively test atmospheric escape models? ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Ethan Schreyer University of California - Santa Cruz Y CoI: Dr. James Edward Owen University of California - Los Angeles N CoI: Dr. Mark Raboin Swain Jet Propulsion Laboratory N CoI: Dr. Evgenya L. Shkolnik Arizona State University N CoI: Dr. Travis Stuart Barman University of Arizona N CoI: Dr. Ruth A. Murray-Clay University of California - Santa Cruz N CoI: Dr. R. O. Parke Loyd Eureka Scientific Inc. N CoI: Dr. David R. Ardila Jet Propulsion Laboratory N CoI: Prof. Hilke E. Schlichting University of California - Los Angeles N CoI: Dr. Jessica Spake Carnegie Institution of Washington N ------------------------------------------------------------------------------------ Abstract The loss of sub Neptune H/He envelopes is believed to be a key mechanism for forming super Earths and producing the bimodal radius distribution of small planets. The two leading hypotheses, photoevaporation (PE) and core powered mass loss (CPML), both produce results consistent with the observed exoplanet population, yet imply dramatically different atmospheric histories of small planets. Thus, escape models need to be validated with direct observations. Recently, it has been suggested that Lyman-alpha tail lengths provide such a test. Before they can be used to analyze escape processes across a large population of planets, these tail models must be validated. In this framework, the Lyman-alpha tail length decreases with increasing EUV flux. We will test this hypothesis by extending the range of EUV flux probed by full-duration Lyman-alpha transits with an additional planet. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will conduct all observations with STIS G140M/1222, a configuration with extensive heritage that limits contamination by geocoronal Lya airglow. HD 15337 has been previosuly observed with STIS G140L. To measure the tail, we stagger five 4-orbit visits. To guard against evolution in the out-of-transit Lya flux between these sets, we will conduct one-orbit pre-transit visit approximately 17-24~h (again, timing limited by SAA passages) ahead of each 4-orbit transit visit. ------------------------------------------------------------------------------------ 17699( 5) - 09-Dec-2025 18:47:07 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STAR, EXTRA-SOLAR RA=02H27M28.3781S, J2000 V = V = 9.09 PLANET, EXTRA-SOLAR DEC=-27D38'6.74" -3.882 PLANETARY SYSTEM, K V-IV Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.005537076695049783 -0.211935 0.0222922 ------------------------------------------------------------------------------------------------------------------------------------ 17699( 5) - 09-Dec-2025 18:47:07 - [ 3] Visit: 01 (Pre-transit 1) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 4] Visit: 02 (Transit 1) Visit Requirements: AFTER 01 BY 0.5 D TO 2.5 D; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.99151172 TO S) 0.99878739; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 2000 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 5] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA HD-15337 7 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 3 2622.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 3 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 6] Visit: 03 (Pre-transit 2) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 7] Visit: 04 (Transit 2) Visit Requirements: AFTER 03 BY 0.5 D TO 2.5 D; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.00000 TO S) 0.00848828; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA HD-15337 7 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 3 2622.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 3 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 9] Visit: 05 (Pre-transit 3) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 10] Visit: 06 (Transit 3) Visit Requirements: AFTER 05 BY 0.75 D TO 2.5 D; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.00970089 TO S) 0.01818918; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 11] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA HD-15337 7 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 3 2622.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 3 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 12] Visit: 07 (Pre-transit 4) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 13] Visit: 08 (Transit 4) Visit Requirements: AFTER 07 BY 22 H TO 2.5 D; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.01940179 TO S) 0.02789007; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 14] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA HD-15337 7 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 3 2622.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 3 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 15] Visit: 09 (Pre-transit 5) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 16] Visit: 10 (Transit 5) Visit Requirements: AFTER 09 BY 22 H TO 60 H; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.02910268 TO S) 0.03516574; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 17] Visit: 11 (Pre-transit 6) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 18] Visit: 12 (Transit 6) Visit Requirements: AFTER 11 BY 1 D TO 3.5 D; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.03637835 TO S) 0.04244141; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 19] Visit: 13 (Pre-transit 7) Visit Requirements: On Hold Comments: Additional Comments: As a primary scientific goal is to measure the length of the Lyman-alpha tail, we need to observe the egress of the Lyman-alpha transit. Therefore, we require the Transit 5 (10) (which is our furthest post-optical transit exposure) to be observed before Transit 1 (02), Transit 2 (04), Transit 3 (06) and Transit 4 (08). This will allow us to adjust the phases of these observations accordingly if we do not see the egress in Transit 5. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 GS ACQ SCENARIO BASE1O3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1000 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 20] Visit: 14 (Transit 7) Visit Requirements: AFTER 13 BY 26 H TO 3.5 D; Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-15337 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 PHASE 0.04365403 TO S) 0.04971709; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-15337 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 3.0 S (3 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (1571 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-15337 STIS/FUV TIME-TA 52X0.2 G140M 1222 BUFFER-TIME=1e4, WAVECAL=NO 1 1500 S -MAMA G see below (2622 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 40 S (40 -MAMA S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-15337 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD-15337 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-15337 3 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 1 1571.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA HD-15337 5 STIS/FUV TIME-TA 52X0.2 G140M 1222 none none none none 2 2622.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA 17699( 5) - 09-Dec-2025 18:47:07 - [ 21] Summary Form for Proposal 17699 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.05ND, 52X0.2, F25ND3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1e4, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 0.5 D TO 2.5 D, AFTER 03 BY 0.5 D TO 2.5 D, AFTER 05 BY 0.75 D TO 2.5 D, AFTER 07 BY 22 H TO 2.5 D, AFTER 09 BY 22 H TO 60 H, AFTER 11 BY 1 D TO 3.5 D, AFTER 13 BY 26 H TO 3.5 D, GS ACQ SCENARIO BASE1O3, PHASE 0.00000 TO 0.00848828, PHASE 0.00970089 TO 0.01818918, PHASE 0.01940179 TO 0.02789007, PHASE 0.02910268 TO 0.03516574, PHASE 0.03637835 TO 0.04244141, PHASE 0.04365403 TO 0.04971709, PHASE 0.99151172 TO 0.99878739, Period 17.180546 D AND ZERO-PHASE HJD2458414.55162 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD-15337, WAVE ------------------------------------------------------------------------------------------------------------------------------------