17152( 4) - 20-Feb-2024 03:25:22 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17152 Version: 4 Check-in Time: 20-Feb-2024 03:25:22 STScI Edit Number: 0 Title Probing for the extended exosphere of a 100 Myr mini-Neptune ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. George Zhou University of Southern Queensland Y CoI: Dr. Chelsea Huang University of Southern Queensland N CoI: Dr. Elisabeth R. Newton Dartmouth College N CoI: Keighley Elizabeth Rockcliffe Dartmouth College N CoI: Duncan Wright University of Southern Queensland N CoI: Nataliea Lowson University of Southern Queensland N CoI: Prof. Rob Wittenmyer University of Southern Queensland N CoI: Dr. Laura C Mayorga The Johns Hopkins University Applied N Physics Laboratory ------------------------------------------------------------------------------------ Abstract Photoevaporation shapes the Neptunes and super-Earths that we find in abundance around Sun-like stars. We will use STIS to probe for the escaping hydrogen exosphere of a mini-Neptune that is undergoing run-away mass-loss. HIP 94235b is a newly discovered planet around a 100 Myr old X-ray active Sun-like star in the AB Doradus moving group. It lies on the edge of the sub-Neptune desert that is thought to be sculpted by early photoevaporation. Unlike previous planets surveyed by HST with detected Lyman alpha escaping atmospheres, HIP 94235b is younger than its run-away mass-loss timescale, and is in the process of shedding the majority of its primordial hydrogen helium envelope. We will observe three Lyman alpha transits of HIP 94235b with STIS, and search for signatures of a significant neutral hydrogen exopshere. We expect transits with >10% transits to be detectable at high significance despite the stellar activity expected for such young stars. Comparing the true mass-loss rate against the energy-limited estimates will help us better understand the factors that govern the early evaporation history of young Neptunes. The extreme XUV environment HIP 94235b resides in will also help guide models of interactions between the stellar wind and escaping hydrogen atmospheres, crucial in interpreting all Lyman alpha transit results from past HST observations. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our program will observe three transits of HD178085b with STIS MAMA-FUV G140M 1222A to measure the planet's radius in Lyman alpha. Each visit will include five consecutive orbits. Visits 1 and 2 are timed to allow for orbit 1 to occur pre-ingress to establish the pre-transit baseline, orbits 2-3 in-transit, orbits 4-5 out of transit. Visit 3 is timed such that orbits 1-2 occur pre-ingress, 3-4 in-transit, and orbit 5 post-egress. Our timing requriement for the first exposure includes a 60 minute window to allow for scheduling flexibility. We can accept a wider phase window (upto 1 orbit) if required. With three visits, we are confident that the transit will be well sampled at the end of the program. 17152( 4) - 20-Feb-2024 03:25:22 - [ 2] The first exposure of each visit includes an ACQ and an ACQ/peak exposure. Each orbit include a single science exposure and a wavecal exposure, with the science exposure of the first orbit made shorter to allow for acquisition. Reduced gyro mode will impact the schedulability of the observations. We do not anticipate science impacts from 2-wheeled operations. ------------------------------------------------------------------------------------ 17152( 4) - 20-Feb-2024 03:25:22 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-178085 STAR, EXTRA-SOLAR RA=19H10M57.8700S, J2000 V = V = 8.347 +/- 0.03 PLANET, G V-IV DEC=-60D16'21.49" 9.470981 Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0015638398084429446 -0.10083599997869896 0.017080687478876836 ------------------------------------------------------------------------------------------------------------------------------------ 17152( 4) - 20-Feb-2024 03:25:22 - [ 4] Visit: 01 Visit Requirements: SCHED 100%; Period 7.713057 D AND ZERO-PHASE HJD 2459037.8704 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-178085 STIS/CCD ACQ F28X50OII MIRROR 1 5 S (5 S) PHASE 0.9829 TO 0.9884 I ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-178085 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 1.5 S (1.5 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1500 1 1350 S -MAMA G see below (1528 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 9 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 11 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 17152( 4) - 20-Feb-2024 03:25:22 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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-178085 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II HD-178085 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-178085 3 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 1 1528.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 1 N/A -MAMA HD-178085 5 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 2 N/A -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 2 N/A -MAMA HD-178085 7 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 3 N/A -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 3 N/A -MAMA HD-178085 9 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 4 N/A -MAMA G WAVE 10 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 4 N/A -MAMA HD-178085 11 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 5 N/A -MAMA G WAVE 12 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 5 N/A -MAMA 17152( 4) - 20-Feb-2024 03:25:22 - [ 6] Visit: 02 Visit Requirements: SCHED 100%; Period 7.713057 D AND ZERO-PHASE HJD 2459037.8704 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-178085 STIS/CCD ACQ F28X50OII MIRROR 1 5 S (5 S) PHASE 0.9829 TO 0.9884 I ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-178085 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 1.5 S (1.5 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1500 1 1350 S -MAMA G see below (1528 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 9 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 11 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G (2536 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 17152( 4) - 20-Feb-2024 03:25:22 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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-178085 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II HD-178085 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-178085 3 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 1 1528.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 1 N/A -MAMA HD-178085 5 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 2 N/A -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 2 N/A -MAMA HD-178085 7 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 3 N/A -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 3 N/A -MAMA HD-178085 9 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 4 N/A -MAMA G WAVE 10 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 4 N/A -MAMA HD-178085 11 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 5 N/A -MAMA G WAVE 12 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 5 N/A -MAMA 17152( 4) - 20-Feb-2024 03:25:22 - [ 8] Visit: 03 Visit Requirements: SCHED 100% 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-178085 STIS/CCD ACQ F28X50OII MIRROR 1 5 S (5 S) I ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-178085 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 1.5 S (1.5 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1500 1 1350 S -MAMA G see below (1462 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G see below (2520 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G see below (2520 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 9 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G see below (2520 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 11 HD-178085 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2536 S -MAMA G see below (2520 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 17152( 4) - 20-Feb-2024 03:25:22 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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-178085 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II HD-178085 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND HD-178085 3 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 1 1462.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 1 N/A -MAMA HD-178085 5 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 2 2520.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 2 N/A -MAMA HD-178085 7 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 3 2520.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 3 N/A -MAMA HD-178085 9 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 4 2520.0 S -MAMA G WAVE 10 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 4 N/A -MAMA HD-178085 11 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 5 2520.0 S -MAMA G WAVE 12 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 5 N/A -MAMA 17152( 4) - 20-Feb-2024 03:25:22 - [ 10] Summary Form for Proposal 17152 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.05ND, 52X0.1, F28X50OIII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1300, BUFFER-TIME=1500, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PHASE 0.9829 TO 0.9884, Period 7.713057 D AND ZERO-PHASE HJD 2459037.8704, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD-178085, WAVE ------------------------------------------------------------------------------------------------------------------------------------