17399( 3) - 13-Jun-2024 20:46:05 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17399 Version: 3 Check-in Time: 13-Jun-2024 20:46:05 STScI Edit Number: 1 Title Astrometric signature of a Second Planet in Proxima ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Luigi R. Bedin INAF - Osservatorio Astronomico di Padova Y CoI: Prof. Adam J. Burgasser University of California - San Diego N CoI: Dr. Mattia Libralato INAF - Istituto di Astrofisica Spaziale N ------------------------------------------------------------------------------------ Abstract Proxima Centauri is the closest star to the Sun and the closest known exo-planetary system to Earth. It is therefore a key benchmark for detailed investigations of multi-planet system architecture, particularly for low mass stars. Recent ground-based radial velocity campaigns indicate the presence of at least one --and possibly a second-- exo-planet orbiting Proxima Centauri. To test the multi-planet configuration of this system, we propose to use HST in spatial-scanning mode to obtain the most precise relative astrometry for Proxima Centauri to date (~20 micro-arc-seconds). The proposed sequence of six (6) epochs of observations over three (3) years will unambiguously detect the astrometric perturbation of Proxima Centauri induced by the hypothesized planet c, and constrain that planet's orbital geometry and mass. ------------------------------------------------------------------------------------ Observations Description ------------------------ Observing Proxima Centauri ------------------------------------------------------------------------------------ 17399( 3) - 13-Jun-2024 20:46:05 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PROXIMA-CENT STAR, LOW MASS RA=14H29M29.0000S, J2000 V = 11.13 AURI-TIME COMPANION, M V-IV DEC=-62D40'25.00" Reference Frame: Other: SIMBAD ------------------------------------------------------------------------------------------------------------------------------------ 2 MOVING-PROXI STAR, DB, LOW MASS RA=14H29M34.4306S, J2000 V = 11.13 MA-CENTAURI COMPANION, WOLF RAYET - DEC=-62D40'34.22" WN Reference Frame: Other: SIMBAD 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 -0.549249654641678 0.7694650000000001 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17399( 3) - 13-Jun-2024 20:46:05 - [ 3] Visit: 01 Visit Requirements: ORIENT 80D TO 90 D; BETWEEN 06-JUL-2024 AND 26-SEP-2024 On Hold Comments: Additional Comments: first epoch must be taken as early as possible during Cy29 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 PROXIMA-CEN WFC3/UVI ACCUM UVIS1-FIX F467M FLASH=16 1 5 S (5 S) POS TARG -4, -4 TAURI-TIME S ------------------------------------------------------------------------------------------------------------------------------------ 2 PROXIMA-CEN WFC3/UVI ACCUM UVIS1 F467M FLASH=16 1 348 S (348 POS TARG -4, -4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 270.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 PROXIMA-CEN WFC3/UVI ACCUM UVIS1 F467M FLASH=16 1 348 S (348 POS TARG -4, 4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 0.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 4 PROXIMA-CEN WFC3/UVI ACCUM UVIS1 F467M FLASH=16 1 348 S (348 POS TARG 0, 0; SPATIAL TAURI-TIME S S) SCAN 0.2128, 270.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 5 PROXIMA-CEN WFC3/UVI ACCUM UVIS1 F467M FLASH=16 1 348 S (348 POS TARG 4, -4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 180.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 6 PROXIMA-CEN WFC3/UVI ACCUM UVIS1 F467M FLASH=16 1 350 S (350 POS TARG 4, 4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 90.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 7 PROXIMA-CEN WFC3/UVI ACCUM UVIS1 F467M FLASH=16 1 5 S (5 S) POS TARG 4, 4 TAURI-TIME 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 | ------------------------------------------------------------------------------------------------------------------------------------ PROXIMA-CENTAURI-TI 1 WFC3/UVI ACCUM UVIS1-FI F467M none none none none 1 N/A ME S X PROXIMA-CENTAURI-TI 2 WFC3/UVI ACCUM UVIS1 F467M none none none none 1 N/A ME S 17399( 3) - 13-Jun-2024 20:46:05 - [ 4] 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 | ------------------------------------------------------------------------------------------------------------------------------------ PROXIMA-CENTAURI-TI 3 WFC3/UVI ACCUM UVIS1 F467M none none none none 1 N/A ME S PROXIMA-CENTAURI-TI 4 WFC3/UVI ACCUM UVIS1 F467M none none none none 1 N/A ME S PROXIMA-CENTAURI-TI 5 WFC3/UVI ACCUM UVIS1 F467M none none none none 1 N/A ME S PROXIMA-CENTAURI-TI 6 WFC3/UVI ACCUM UVIS1 F467M none none none none 1 N/A ME S PROXIMA-CENTAURI-TI 7 WFC3/UVI ACCUM UVIS1 F467M none none none none 1 N/A ME S 17399( 3) - 13-Jun-2024 20:46:05 - [ 5] Visit: 02 Visit Requirements: ORIENT 275D TO 327 D; BETWEEN 19-FEB-2025 AND 22-MAR-2025 On Hold Comments: Additional Comments: first epoch must be taken as early as possible during Cy29 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 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 5 S (5 S) POS TARG -4, -4 TAURI-TIME S ------------------------------------------------------------------------------------------------------------------------------------ 2 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 348 S (348 POS TARG -4, -4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 270.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 3 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 348 S (348 POS TARG -4, 4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 0.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 4 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 348 S (348 POS TARG 0, 0; SPATIAL TAURI-TIME S S) SCAN 0.2128, 270.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 5 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 348 S (348 POS TARG 4, -4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 180.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 6 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 350 S (350 POS TARG 4, 4; SPATIAL TAURI-TIME S S) SCAN 0.2128, 90.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ 7 PROXIMA-CEN WFC3/UVI ACCUM UVIS2-FIX F467M FLASH=16 1 5 S (5 S) POS TARG 4, 4 TAURI-TIME 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 | ------------------------------------------------------------------------------------------------------------------------------------ PROXIMA-CENTAURI-TI 1 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X PROXIMA-CENTAURI-TI 2 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X 17399( 3) - 13-Jun-2024 20:46:05 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ PROXIMA-CENTAURI-TI 3 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X PROXIMA-CENTAURI-TI 4 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X PROXIMA-CENTAURI-TI 5 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X PROXIMA-CENTAURI-TI 6 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X PROXIMA-CENTAURI-TI 7 WFC3/UVI ACCUM UVIS2-FI F467M none none none none 1 N/A ME S X 17399( 3) - 13-Jun-2024 20:46:05 - [ 7] Summary Form for Proposal 17399 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS1, UVIS1-FIX, UVIS2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=16 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 06-JUL-2024 AND 26-SEP-2024, BETWEEN 19-FEB-2025 AND 22-MAR-2025, ORIENT 275D TO 327 D, ORIENT 80D TO 90 D, POS TARG -4, -4, POS TARG -4, 4, POS TARG 0, 0, POS TARG 4, -4, POS TARG 4, 4, SPATIAL SCAN 0.2128, 0.0 Degrees, Forward, 1.25 Arcsec, 6, SPATIAL SCAN 0.2128, 180.0 Degrees, Forward, 1.25 Arcsec, 6, SPATIAL SCAN 0.2128, 270.0 Degrees, Forward, 1.25 Arcsec, 6, SPATIAL SCAN 0.2128, 90.0 Degrees, Forward, 1.25 Arcsec, 6 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F467M ------------------------------------------------------------------------------------------------------------------------------------ Target Names PROXIMA-CENTAURI-TIME ------------------------------------------------------------------------------------------------------------------------------------