16759( 3) - 08-Jul-2022 00:55:49 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16759 Version: 3 Check-in Time: 08-Jul-2022 00:55:49 STScI Edit Number: 0 Title Obtaining the UV Reddening Curve of Extreme-Rv Highly Polarizing Dust Irradiated by Zeta Ophiuchi ------------------------------------------------------------------------------------ Type Cycle GO 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Henry A. Kobulnicky University of Wyoming Y CoI: Ashley Piccone University of Wyoming N CoI: Jordan Antoinette Bartlett University of Wyoming N CoI: Dr. Matthew Samuel Povich Cal Poly Pomona Foundation, Inc. N ------------------------------------------------------------------------------------ Abstract Extinction and polarization by interstellar dust taints astrophysical signals, frustrating precision measurement of cosmological standard candles, electromagnetic components of multimessenger transients, and CMB signals. Understanding the origins of dust variations on small angular scales and along the line of sight in true three-dimensional detail, as informed by local physical influences, is now both possible and pressing. We propose STIS 1600-3100 A spectroscopy of five background stars probing a diffuse cloud irradiated by the O9.2IV star Zeta Oph, the nearest (182 pc) high-UV environment. Our optical polarization measurements along these mid-latitude low-confusion sightlines reveal a B field aligned with 8-micron bright filaments. The ratio of polarization to color excess, P/E(B-V), exceeds the empirical (Serkowski) limit of 9, indicating very efficient polarization and a high degree of grain alignment, plausibly from spin-up by radiative torques. The optical/infrared data indicate a reddening curve characteristic of R_V=A_V/E(B-V)<2.4, a signature of extreme dust and a size distribution favoring small grains. With measurement of the near-UV reddening slope, the height and width of the 2175 A bump, and potentially the far-UV rise, we will be able to forge a compelling association between extinction curve morphology, polarization efficiency, grain magnetic field alignment, and the dominant radiative influence of a well-characterized hot star. Characterizing the extinction of high-polarization low-Rv PAH-emitting grains in this local laboratory promotes understanding the conditions that produce anomalous dust in AGN, SNe, GRBs, and starbursts further afield. ------------------------------------------------------------------------------------ Observations Description ------------------------ We are conducting STIS G230L spectroscopy covering 1570-3180 Angstroms to obtain spectrophotometry over a broad bandpass with the maximum possible sensitivity, hence, using a large slit. Exposure times vary from 1360 s to 3270 s per star for each of 5 stars. A total of 5 orbits was allocated. ------------------------------------------------------------------------------------ 16759( 3) - 08-Jul-2022 00:55:49 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PK2021-04 STAR, G III-I, G V-IV RA=16H36M24.8476S, J2000 V = 12.19 +/- 0.01 DEC=-10D32'39.55" 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 -0.0017000408166328005 -0.02389 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 PK2021-13 STAR, F3-F9 RA=16H36M56.8080S, J2000 V = 12.32 +/- 0.01 DEC=-10D29'13.56" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 1.2203854249086092E-4 -0.00827 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 PK2021-24 STAR, G III-I, G V-IV RA=16H37M50.8080S, J2000 V = 12.20 +/- 0.01 DEC=-10D33'6.84" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 -0.001428828978350717 0.00904 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 PK2021-26 STAR, F3-F9 RA=16H38M1.1760S, J2000 V = 13.06 +/- 0.01 DEC=-10D34'46.92" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 8.138348160802473E-5 -0.008320000000000001 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 5 PK2021-27 STAR, F3-F9 RA=16H38M2.5920S, J2000 V = 12.95 +/- 0.01 DEC=-10D28'7.68" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 7.220187260177687E-4 -0.0030499999999999998 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16759( 3) - 08-Jul-2022 00:55:49 - [ 3] Visit: 01 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 PK2021-04 STIS/CCD ACQ F25ND3 MIRROR 1 9 S (9 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PK2021-04 STIS/NUV ACCUM 52X2 G230L 2376 1 2125 S -MAMA (2125 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 | ------------------------------------------------------------------------------------------------------------------------------------ PK2021-04 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A PK2021-04 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 N/A -MAMA 16759( 3) - 08-Jul-2022 00:55:49 - [ 4] Visit: 02 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 PK2021-13 STIS/CCD ACQ F25ND3 MIRROR 1 12 S (12 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PK2021-13 STIS/NUV ACCUM 52X2 G230L 2376 1 2113 S -MAMA (2113 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 | ------------------------------------------------------------------------------------------------------------------------------------ PK2021-13 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A PK2021-13 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 N/A -MAMA 16759( 3) - 08-Jul-2022 00:55:49 - [ 5] Visit: 03 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 PK2021-24 STIS/CCD ACQ F25ND3 MIRROR 1 12 S (12 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PK2021-24 STIS/NUV ACCUM 52X2 G230L 2376 1 2113 S -MAMA (2113 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 | ------------------------------------------------------------------------------------------------------------------------------------ PK2021-24 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A PK2021-24 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 N/A -MAMA 16759( 3) - 08-Jul-2022 00:55:49 - [ 6] Visit: 04 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 PK2021-26 STIS/CCD ACQ F25ND3 MIRROR 1 22 S (22 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PK2021-26 STIS/NUV ACCUM 52X2 G230L 2376 1 2070 S -MAMA (2070 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 | ------------------------------------------------------------------------------------------------------------------------------------ PK2021-26 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A PK2021-26 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 N/A -MAMA 16759( 3) - 08-Jul-2022 00:55:49 - [ 7] Visit: 05 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 PK2021-27 STIS/CCD ACQ F25ND3 MIRROR 1 22 S (22 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PK2021-27 STIS/NUV ACCUM 52X2 G230L 2376 1 2063 S -MAMA (2063 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 | ------------------------------------------------------------------------------------------------------------------------------------ PK2021-27 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A PK2021-27 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 N/A -MAMA 16759( 3) - 08-Jul-2022 00:55:49 - [ 8] Summary Form for Proposal 16759 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X2, F25ND3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names PK2021-04, PK2021-13, PK2021-24, PK2021-26, PK2021-27 ------------------------------------------------------------------------------------------------------------------------------------