16840( 3) - 22-Apr-2022 03:40:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16840 Version: 3 Check-in Time: 22-Apr-2022 03:40:42 STScI Edit Number: 0 Title Two unique sources in a row: HLX-1 and a newborn hard tidal disruption event ------------------------------------------------------------------------------------ Type Cycle GO 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Dacheng Lin Northeastern University Y CoI: Dr. Olivier Godet Observatoire Midi-Pyrenees N CoI: Dr. Natalie A. Webb Observatoire Midi-Pyrenees N CoI: Dr. Roberto Soria National Astronomical Observatories of N China - NAOC CoI: Prof. Jimmy A. Irwin University of Alabama N CoI: Dr. Didier Barret Observatoire Midi-Pyrenees N CoI: Dr. Luca Zampieri Osservatorio Astronomico di Padova N CoI: Ms. Sara Federle Universidad Andres Bello N CoI: Prof. Enrico Maria Corsini Universita degli Studi di Padova N ------------------------------------------------------------------------------------ Abstract We request a Chandra observation (80 ks) of two very rare objects that fall within the same field of view: the strong intermediate-mass black hole candidate ESO 243-49 HLX-1 and a newborn hard tidal disruption event (TDE). For HLX-1, which has been in a prolonged low state for nearly 4 yr, the data will be crucial to measure the current level of the low state and test two competing models for the formation of the system. Five HST orbits are also requested to pin down the host population and age by measuring the host in UV and optical when the contamination from the central source is minimal. For the new hard TDE, our goal is to constrain its long-term X-ray evolution, especially to detect the fast drop, which would be a strong indicator of a jet being shut off. ------------------------------------------------------------------------------------ Observations Description ------------------------ Orbit 1: for ACS SBC F140LP, 4-point box dithering ~2640s of effective exposure time Orbit 2 for WFC3 UVIS F300X, with UV flashing and WFC3-UVIS-DITHER-BOX, 1456s split into 4 exposures of 364s each. Then the last 2 exposures in the F336W filter, also with UV flashing and dithering, 364s each; Orbit 3 for the last 2 exposures in the F336W filter, with UV flashing and dithering, 364s each, total of 1456s (including those of orbit 2). Then, all 4 exposures for F390W, dithered, 365s each, total of ~1460s (no UV flashing needed) Orbit 4 for F555W, 1480s split into 4 dithered exposures of 370s each. Then the first 2 exposures in the F621M filter, also with dithering, 371s each; 16840( 3) - 22-Apr-2022 03:40:42 - [ 2] orbit 5 for the last 2 dithered exposures in the F621M filter, 371s each, total of 1484s. Then all 4 dithered exposures for F775W, 363s each, total of ~1452s. ------------------------------------------------------------------------------------ 16840( 3) - 22-Apr-2022 03:40:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 FWB2009-HLX- STELLAR CLUSTER, RA=01H10M28.3000S, J2000 V = 24.5 1 GLOBULAR CLUSTER DEC=-46D04'22.30" 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 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16840( 3) - 22-Apr-2022 03:40:42 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-SBC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.179 Line_Spacing 0.116 Coordinate_Frame POS-TARG Pattern_Orient 20.02 Angle_Between_Sides 63.65 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16840( 3) - 22-Apr-2022 03:40:42 - [ 5] 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 FWB2009-HLX ACS/SBC ACCUM SBC F140LP 1 675 S PATTERN 1 1 -1 see below (2640 S) Comments: ACS.im.1011860 ETC run done using the well-determined Vega brightness in the U band and the best-fitting model spectrum. ACS.im.1011865 ETC run done using the observed flux density at 1500 Ang, from 2013. The two runs give essentially the same result, S/N = 10 for the requested exposure time. This is our best estimate of how the source will look like in 6 months' time. However, it could turn out to be a factor of 2 brighter or fainter, so the S/N could be ~7 or ~15. ------------------------------------------------------------------------------------------------------------------------------------ 2 FWB2009-HLX WFC3/UVI ACCUM UVIS2-C51 F300X FLASH=10 1 384 S PATTERN 2 2 -1 S 2C-CTE see below (1448 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 FWB2009-HLX WFC3/UVI ACCUM UVIS2-C51 F336W FLASH=10 1 402 S PATTERN 2 3 -1 S 2C-CTE see below (1440 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 FWB2009-HLX WFC3/UVI ACCUM UVIS2-C51 F390W FLASH=9 1 403 S PATTERN 2 4 -1 S 2C-CTE see below (1452 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 FWB2009-HLX WFC3/UVI ACCUM UVIS2-C51 F555W 1 402 S PATTERN 2 5 -1 S 2C-CTE see below (1464 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 FWB2009-HLX WFC3/UVI ACCUM UVIS2-C51 F621M FLASH=6 1 402 S PATTERN 2 6 -1 S 2C-CTE see below (1472 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 FWB2009-HLX WFC3/UVI ACCUM UVIS2-C51 F775W FLASH=6 1 402 S PATTERN 2 7 -1 S 2C-CTE see below (1444 S) ------------------------------------------------------------------------------------------------------------------------------------ 16840( 3) - 22-Apr-2022 03:40:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FWB2009-HLX-1 1 ACS/SBC ACCUM SBC F140LP 1 none none none 1 660.0 S FWB2009-HLX-1 1 ACS/SBC ACCUM SBC F140LP 2 none none none 1 660.0 S FWB2009-HLX-1 1 ACS/SBC ACCUM SBC F140LP 3 none none none 1 660.0 S FWB2009-HLX-1 1 ACS/SBC ACCUM SBC F140LP 4 none none none 1 660.0 S FWB2009-HLX-1 2 WFC3/UVI ACCUM UVIS2-C5 F300X 1 none none none 2 362.0 S S 12C-CTE FWB2009-HLX-1 2 WFC3/UVI ACCUM UVIS2-C5 F300X 2 none none none 2 362.0 S S 12C-CTE FWB2009-HLX-1 2 WFC3/UVI ACCUM UVIS2-C5 F300X 3 none none none 2 362.0 S S 12C-CTE FWB2009-HLX-1 2 WFC3/UVI ACCUM UVIS2-C5 F300X 4 none none none 2 362.0 S S 12C-CTE FWB2009-HLX-1 3 WFC3/UVI ACCUM UVIS2-C5 F336W 1 none none none 2 360.0 S S 12C-CTE FWB2009-HLX-1 3 WFC3/UVI ACCUM UVIS2-C5 F336W 2 none none none 2 360.0 S S 12C-CTE FWB2009-HLX-1 3 WFC3/UVI ACCUM UVIS2-C5 F336W 3 none none none 3 360.0 S S 12C-CTE FWB2009-HLX-1 3 WFC3/UVI ACCUM UVIS2-C5 F336W 4 none none none 3 360.0 S S 12C-CTE FWB2009-HLX-1 4 WFC3/UVI ACCUM UVIS2-C5 F390W 1 none none none 3 363.0 S S 12C-CTE FWB2009-HLX-1 4 WFC3/UVI ACCUM UVIS2-C5 F390W 2 none none none 3 363.0 S S 12C-CTE FWB2009-HLX-1 4 WFC3/UVI ACCUM UVIS2-C5 F390W 3 none none none 3 363.0 S S 12C-CTE FWB2009-HLX-1 4 WFC3/UVI ACCUM UVIS2-C5 F390W 4 none none none 3 363.0 S S 12C-CTE FWB2009-HLX-1 5 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 4 366.0 S S 12C-CTE FWB2009-HLX-1 5 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 4 366.0 S S 12C-CTE FWB2009-HLX-1 5 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 4 366.0 S S 12C-CTE FWB2009-HLX-1 5 WFC3/UVI ACCUM UVIS2-C5 F555W 4 none none none 4 366.0 S S 12C-CTE FWB2009-HLX-1 6 WFC3/UVI ACCUM UVIS2-C5 F621M 1 none none none 4 368.0 S S 12C-CTE FWB2009-HLX-1 6 WFC3/UVI ACCUM UVIS2-C5 F621M 2 none none none 4 368.0 S S 12C-CTE FWB2009-HLX-1 6 WFC3/UVI ACCUM UVIS2-C5 F621M 3 none none none 5 368.0 S S 12C-CTE 16840( 3) - 22-Apr-2022 03:40:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ FWB2009-HLX-1 6 WFC3/UVI ACCUM UVIS2-C5 F621M 4 none none none 5 368.0 S S 12C-CTE FWB2009-HLX-1 7 WFC3/UVI ACCUM UVIS2-C5 F775W 1 none none none 5 361.0 S S 12C-CTE FWB2009-HLX-1 7 WFC3/UVI ACCUM UVIS2-C5 F775W 2 none none none 5 361.0 S S 12C-CTE FWB2009-HLX-1 7 WFC3/UVI ACCUM UVIS2-C5 F775W 3 none none none 5 361.0 S S 12C-CTE FWB2009-HLX-1 7 WFC3/UVI ACCUM UVIS2-C5 F775W 4 none none none 5 361.0 S S 12C-CTE 16840( 3) - 22-Apr-2022 03:40:42 - [ 8] Summary Form for Proposal 16840 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC, UVIS2-C512C-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=6, FLASH=9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 2, PATTERN 2 3, PATTERN 2 4, PATTERN 2 5, PATTERN 2 6, PATTERN 2 7 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140LP, F300X, F336W, F390W, F555W, F621M, F775W ------------------------------------------------------------------------------------------------------------------------------------ Target Names FWB2009-HLX-1 ------------------------------------------------------------------------------------------------------------------------------------