15104( 4) - 12-Dec-2018 19:53:10 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15104 Version: 4 Check-in Time: 12-Dec-2018 19:53:10 STScI Edit Number: 1 Title Probing CO-dark Gas within the Planck Galactic Cold Clumps ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Cody Lee Dirks Northwestern University Y CoI: Dr. Dave M. Meyer Northwestern University N ------------------------------------------------------------------------------------ Abstract The Planck Catalogue of Galactic Cold Clumps (PGCC) has identified the coldest regions of interstellar dust across the entire sky based on submillimeter emission. These sources range from relatively diffuse cold clouds to pre-stellar cores embedded in giant molecular clouds. In recent years, theoretical and observational evidence has shown that there exists a component of the cold molecular ISM that is "CO-dark" - that is, it contains very little carbon monoxide, the most common tracer of molecular hydrogen, and thus is hidden and unaccounted for in our measurements of the molecular content of the ISM. The PGCC represents an excellent test bed to probe for this CO-dark gas. To do so, we can use the high-resolution UV absorption line capabilities of the STIS instrument to probe for CO at higher sensitivities than CO emission line surveys. Furthermore, we can independently measure both the molecular hydrogen and total hydrogen content, which have been shown to correlate well with Cl I and O I absorption, respectively. As part of a previous archival survey, we identified existing STIS sightlines in the sky vicinity of PGCC objects, and found that a surprisingly small number of these sightlines displayed strong CO absorption. This general lack of CO absorption directly indicates the presence of CO-dark gas near these cold dust emission sources. However, our archival study found no high-resolution far-UV STIS spectra of any stars that lie directly behind a PGCC source. We now propose to observe seven sightlines that probe the central cores of these regions, allowing us to better characterize the prevalence and nature of CO-dark gas in these sources. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to obtain high-resolution (R ~ 110, 000) STIS observations of selected inter- stellar UV absorption lines that were chosen based on their close vicinity on the sky to cold, dusty environments detected by Planck. Furthermore, we only selected sightlines that are clearly behind these regions, as determined by comparing Gaia parallax measurements for the stars to Planck distance estimates for the PGCC sources. We can address all of our stated scientific goals with the E140H echelle grating centered on 1343 A (covering the wavelength interval 1242-1444 A), and using the 0.2x0.2'' slit (except for the case of HD 217943, whose UV flux requires the use of 31x0.05NDB neutral density filter to avoid the MAMA bright limits). This setup will simultaneously capture the O I line at 1355.60 Angstroms, the Cl I lines at 1347.24, 1373.11, 1379.53, 1389.69 Angstroms, and the C I multiplets near 1277, 1280, 1329 Angstroms. It will also capture eight bands of molecular CO absorption between 15104( 4) - 12-Dec-2018 19:53:10 - [ 2] 1263 and 1419 Angstroms. We aim to achieve a spectral sensitivity of S/N ~ 20 for the Cl I line near the center of the bandpass. ------------------------------------------------------------------------------------ 15104( 4) - 12-Dec-2018 19:53:10 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD217943 STAR, B0-B2 V-IV, RA=23H03M23.7148S +/- 0.00325", J2000 V = 6.733 +/- 0.01 PULSATING VARIABLE DEC=+60D26'43.47" +/- 0.00281" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, parallax and magnitude (and their associated errors) taken from the SIMBAD Database, when available. Listed as pulsating variable - analysis of Hipparcos light curve shows variability of order 0.02 mag (Dubath et al 2011). Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 9.433976000495612E-4 -0.0011 0.00209 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD147196 STAR, B6-B9.5 V-IV, BE RA=16H21M19.1913S +/- 0.00492", J2000 V = 7.04 +/- 0.02 DEC=-23D42'28.75" +/- 0.00395" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, parallax and magnitude (and their associated errors) taken from the SIMBAD Database, when available. V magnitude error taken from Tycho-2 VT and BT magnitudes Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -7.819952715088989E-4 -0.02551 0.00664 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4768 STAR, B6-B9.5 III-I, RA=00H50M27.9210S +/- 0.00571", J2000 V = 7.57 +/- 0.01 EMISSION LINE STAR DEC=+59D40'18.30" +/- 0.00527" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, parallax and magnitude (and their associated errors) taken from the SIMBAD Database, when available. Error in V magnitude determined from Tycho-2 VT and BT magnitudes. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -3.7759270036627973E-4 -7.099999999999999E-4 0.00094 ------------------------------------------------------------------------------------------------------------------------------------ 4 HD94414 STAR, B3-B5 V-IV RA=10H50M55.9455S +/- 0.00536", J2000 V = 8.01 +/- 0.01 DEC=-77D07'28.58" +/- 0.00501" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, parallax and magnitude (and their associated errors) taken from the SIMBAD Database, when available. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.005669456119934517 -0.0012 0.0028 ------------------------------------------------------------------------------------------------------------------------------------ 15104( 4) - 12-Dec-2018 19:53:10 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 5 HD220058 STAR, B0-B2 V-IV, BE RA=23H20M19.0165S +/- 0.00789", J2000 V = 8.59 +/- 0.02 DEC=+55D48'28.08" +/- 0.00562" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, parallax and magnitude (and their associated errors) taken from the SIMBAD Database, when available. Error in V magnitude determined from Tycho-2 VT and BT magnitudes. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -3.1911505103861417E-4 -8.7E-4 0.0014 ------------------------------------------------------------------------------------------------------------------------------------ 6 HD236101 STAR, B6-B9.5 V-IV RA=23H20M29.4492S +/- 0.01737", J2000 V = 9.39 +/- 0.02 DEC=+54D34'39.97" +/- 0.01696" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, parallax and magnitude (and their associated errors) taken from the SIMBAD Database, when available. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 2.3004474208769978E-5 5.0E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 7 HD334041 STAR, B6-B9.5 V-IV, RA=20H17M51.5088S +/- 0.03366", J2000 V = 10.36 +/- 0.05 EMISSION LINE STAR DEC=+30D57'38.05" +/- 0.01997" Reference Frame: ICRS Extended: NO Comments: Coordinates, PMs, and parallax (and their associated errors) taken from the SIMBAD Database. V magnitude and its associated error determined from Tycho-2 VT and BT magnitudes. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 -0.0039 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15104( 4) - 12-Dec-2018 19:53:10 - [ 5] Visit: 01 (HD217943) Visit Requirements: CVZ 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 HD217943 STIS/CCD ACQ F25ND5 MIRROR 1 20 S (20 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD217943 STIS/CCD ACQ/PEA 0.3X0.05N MIRROR 1 0.7 S (0.7 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD217943 STIS/FUV ACCUM 31X0.05ND E140H 1343 2 1759 S -MAMA B (3518 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD217943 1 STIS/CCD ACQ F25ND5 MIRROR none none none none 1 N/A HD217943 2 STIS/CCD ACQ/PEA 0.3X0.05 MIRROR none none none none 1 N/A K ND HD217943 3 STIS/FUV ACCUM 31X0.05N E140H 1343 none none 1 none 1 N/A -MAMA DB HD217943 3 STIS/FUV ACCUM 31X0.05N E140H 1343 none none 2 none 1 N/A -MAMA DB 15104( 4) - 12-Dec-2018 19:53:10 - [ 6] Visit: 02 (HD147196) Visit Requirements: 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 HD147196 STIS/CCD ACQ F25ND3 MIRROR 1 0.3 S (0.3 GS ACQ SCENARIO BASE1B3 S) Comments: Previously observed in 2015 in the optical with STIS - used same target acquistion exposure settings as that visit. ------------------------------------------------------------------------------------------------------------------------------------ 2 HD147196 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1074 S -MAMA (2148 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD147196 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD147196 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 1 N/A -MAMA HD147196 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 1 N/A -MAMA 15104( 4) - 12-Dec-2018 19:53:10 - [ 7] Visit: 03 (HD4768) Visit Requirements: CVZ 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 HD4768 STIS/CCD ACQ F28X50OII MIRROR 1 0.3 S (0.3 I S) Comments: Listed as emission line star in SIMBAD. No optical data is currently available to gauge strength of emission lines, so we choose the O III filter to minimize wavelength coverage. ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4768 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 2125 S -MAMA (4250 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD4768 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II HD4768 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 1 N/A -MAMA HD4768 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 1 N/A -MAMA 15104( 4) - 12-Dec-2018 19:53:10 - [ 8] Visit: 04 (HD94414) Visit Requirements: 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 HD94414 STIS/CCD ACQ F25ND3 MIRROR 1 0.3 S (0.3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD94414 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1285 S -MAMA (2570 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD94414 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1651 S -MAMA (3302 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD94414 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD94414 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 1 N/A -MAMA HD94414 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 1 N/A -MAMA HD94414 3 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 2 N/A -MAMA HD94414 3 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 2 N/A -MAMA 15104( 4) - 12-Dec-2018 19:53:10 - [ 9] Visit: 05 (HD220058) Visit Requirements: 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 HD220058 STIS/CCD ACQ F28X50OII MIRROR 1 0.7 S (0.7 I S) Comments: Listed as Be star in SIMBAD. No optical data is currently available to gauge strength of emission lines, so we choose the O III filter to minimize wavelength coverage. ------------------------------------------------------------------------------------------------------------------------------------ 2 HD220058 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1229 S -MAMA (2458 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD220058 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II HD220058 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 1 N/A -MAMA HD220058 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 1 N/A -MAMA 15104( 4) - 12-Dec-2018 19:53:10 - [ 10] Visit: 06 (HD236101) Visit Requirements: 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 HD236101 STIS/CCD ACQ F25ND3 MIRROR 1 1.0 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD236101 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1190 S -MAMA (2380 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD236101 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD236101 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 1 N/A -MAMA HD236101 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 1 N/A -MAMA 15104( 4) - 12-Dec-2018 19:53:10 - [ 11] Visit: 07 (HD334041) Visit Requirements: 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 HD334041 STIS/CCD ACQ F25ND3 MIRROR 1 3.0 S (3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD334041 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1109 S -MAMA (2218 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD334041 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1372 S -MAMA (2744 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 HD334041 STIS/FUV ACCUM 0.2X0.2 E140H 1343 2 1372 S -MAMA (2744 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD334041 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD334041 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 1 N/A -MAMA HD334041 2 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 1 N/A -MAMA HD334041 3 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 2 N/A -MAMA HD334041 3 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 2 N/A -MAMA HD334041 4 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 1 none 3 N/A -MAMA HD334041 4 STIS/FUV ACCUM 0.2X0.2 E140H 1343 none none 2 none 3 N/A -MAMA 15104( 4) - 12-Dec-2018 19:53:10 - [ 12] Summary Form for Proposal 15104 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.2, 0.3X0.05ND, 31X0.05NDB, F25ND3, F25ND5, F28X50OIII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CVZ, GS ACQ SCENARIO BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140H, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD147196, HD217943, HD220058, HD236101, HD334041, HD4768, HD94414 ------------------------------------------------------------------------------------------------------------------------------------