13698( 9) - 23-Sep-2014 15:58:36 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13698 Version: 9 Check-in Time: 23-Sep-2014 15:58:36 STScI Edit Number: 5 Title The environments and progenitors of calcium-rich transients ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Joe Lyman The University of Warwick Y CoI: Prof. Andrew J. Levan The University of Warwick N CoI: Prof. Nial R. Tanvir University of Leicester N CoI: Prof. Melvyn Davies Lund University N CoI: Dr. Ross Church Lund University N CoI: Ms. Charlotte Angus The University of Warwick N ------------------------------------------------------------------------------------ Abstract Calcium-rich transients represent a new, peculiar class of extra-galactic explosion in which up to half the ejecta is calcium. Exhibiting peak luminosities in the gap between novae and supernovae, and fast evolving light curves, they present a challenge for both observation and theory. Their host galaxy locations prove a problem for most proposed progenitor systems as they are preferentially located at extreme offsets from their putative hosts, and no underlying stellar population has yet been detected in these cases. In this proposal we will either detect for the first time, or conclusively rule out, underlying systems at the locations of a sample of these extreme-offset transients through very deep imaging provided by HST. Alongside this, we will characterise the underlying stellar population of examples of the class which appear, in projection, to be within the disks of their hosts. From these observations we will ascertain if Ca-rich transients are born in-situ or kicked from their birth sites at high velocity. Either scenario is of significant interest. If born in situ then there must be unusual chemical evolution properties in the exceptionally low mass systems in which they reside, which produce such unusual transients. In contrast if they are kicked then binary mergers (e.g. white dwarf -- neutron star) would become favoured systems, making these events powerful tools for constraining the evolution in creating tight binaries, and with important implications for gravitational wave searches. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain deep broadband imaging data over the course of 6 orbits in order to probe sufficient depths at the locations of 3 local Ca-rich transients that appear to have no underlying systems in shallower imaging, labelled SNe 2003dr, 2005E and 2007ke. Imaging will be done using the ACS/WFC in filters F435W and F606W to give us good overall sensitivity, and specifically sensitivity to young stellar populations. Accounting for visibility 13698( 9) - 23-Sep-2014 15:58:36 - [ 2] and guide star and instrumental overheads respectively, with three frames per orbit, the HST ETC was used to estimate limiting magnitudes of mF435W = 28 and mF606W = 28.3. A F435W-F606W colour will be useful should we detect anything, however we can also combine both images to attempt to discover extremely faint sources of flux. Additionally, we wish to characterise the stellar populations of two other proximate members, SNe 2001co and 2003dg, which are coincident with their hosts' stellar disks (there- fore such deep imaging is not required to observe the underlying population) over 4 orbits. For each, we will use the ACS/WFC to observe Halpha with FR656N (at central wavelength around 6680A) to a depth of 24.5 mag over one orbit (after accounting for visibility and overheads) as a tight constraint on the age of the underlying population. Additionally, F435W and F606W expo- sures will be obtained for half an orbit each to reach 26 mag, these will allow subtraction of the continuum light from the Halphaobservations and provide further constraints to the popu- lation through the colour (which can be compared to the F435W and F606W observations for 2003dr, 2005E and 2007ke, should we detect anything). ------------------------------------------------------------------------------------ 13698( 9) - 23-Sep-2014 15:58:36 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-2005E UNIDENTIFIED, BLANK RA=02H39M14.3400S, J2000 V = 26 FIELD DEC=+01D05'55.00" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2003DR GALAXY, SPIRAL RA=14H38M11.1300S, J2000 V = 26 DEC=+46D38'3.40" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-2007KE GALAXY, ELLIPTICAL RA=02H54M23.9000S, J2000 V = 26 DEC=+41D34'16.30" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-2001CO GALAXY, SPIRAL RA=14H19M12.8348S, J2000 ~23 mag/arcsec^2 in visual DEC=+24D47'57.03" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-2003DG GALAXY, SPIRAL RA=11H57M31.9700S, J2000 ~23 mag/arcsec^2 in V DEC=-01D15'13.60" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13698( 9) - 23-Sep-2014 15:58:36 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13698( 9) - 23-Sep-2014 15:58:36 - [ 5] Visit: 01 Visit Requirements: ORIENT 40D TO 55 D On Hold Comments: Additional Comments: 4-point dither of the location of SN 2005E will be perform in filters F606W and F435W over 1 orbit each. WFC1-CTE aperture is used to combat CTE. 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 SN-2005E ACS/WFC ACCUM WFC2 F606W 1 500 S POS TARG see below 87.38451032464434, (2192 S) -31.705764036529335; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2005E ACS/WFC ACCUM WFC2 F435W 1 500 S POS TARG see below 87.38451032464434, (2324 S) -31.705764036529335; PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2005E 1 ACS/WFC ACCUM WFC2 F606W 1 none none none 1 548.0 S SN-2005E 1 ACS/WFC ACCUM WFC2 F606W 2 none none none 1 548.0 S SN-2005E 1 ACS/WFC ACCUM WFC2 F606W 3 none none none 1 548.0 S SN-2005E 1 ACS/WFC ACCUM WFC2 F606W 4 none none none 1 548.0 S SN-2005E 2 ACS/WFC ACCUM WFC2 F435W 1 none none none 2 581.0 S SN-2005E 2 ACS/WFC ACCUM WFC2 F435W 2 none none none 2 581.0 S SN-2005E 2 ACS/WFC ACCUM WFC2 F435W 3 none none none 2 581.0 S SN-2005E 2 ACS/WFC ACCUM WFC2 F435W 4 none none none 2 581.0 S 13698( 9) - 23-Sep-2014 15:58:36 - [ 6] Visit: 02 Visit Requirements: ORIENT 352D TO 20 D; ORIENT 163D TO 177 D On Hold Comments: Additional Comments: 4-point dither of the location of SN 2003dr will be perform in filters F606W and F435W over 1 orbit each. WFC2 aperture is used to contain the galaxy within a single chip. 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 SN-2003DR ACS/WFC ACCUM WFC2 F606W 1 500 S POS TARG see below -9.29885365064924, (2328 S) -12.702731862764875; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2003DR ACS/WFC ACCUM WFC2 F435W 1 600 S POS TARG see below -9.29885365064924, (2460 S) -12.702731862764875; PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2003DR 1 ACS/WFC ACCUM WFC2 F606W 1 none none none 1 582.0 S SN-2003DR 1 ACS/WFC ACCUM WFC2 F606W 2 none none none 1 582.0 S SN-2003DR 1 ACS/WFC ACCUM WFC2 F606W 3 none none none 1 582.0 S SN-2003DR 1 ACS/WFC ACCUM WFC2 F606W 4 none none none 1 582.0 S SN-2003DR 2 ACS/WFC ACCUM WFC2 F435W 1 none none none 2 615.0 S SN-2003DR 2 ACS/WFC ACCUM WFC2 F435W 2 none none none 2 615.0 S SN-2003DR 2 ACS/WFC ACCUM WFC2 F435W 3 none none none 2 615.0 S SN-2003DR 2 ACS/WFC ACCUM WFC2 F435W 4 none none none 2 615.0 S 13698( 9) - 23-Sep-2014 15:58:36 - [ 7] Visit: 03 Visit Requirements: ORIENT 250D TO 300 D On Hold Comments: Additional Comments: 4-point dither of the location of SN 2007ke will be perform in filters F606W and F435W over 1 orbit each. WFC1-CTE aperture is used to combat CTE. 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 SN-2007KE ACS/WFC ACCUM WFC1-CTE F606W 1 500 S POS TARG see below -1.9911196793179953, (2288 S) -3.0397210319149726; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2007KE ACS/WFC ACCUM WFC1-CTE F435W 1 600 S POS TARG see below -1.9911196793179953, (2416 S) -3.0397210319149726; PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2007KE 1 ACS/WFC ACCUM WFC1-CTE F606W 1 none none none 1 572.0 S SN-2007KE 1 ACS/WFC ACCUM WFC1-CTE F606W 2 none none none 1 572.0 S SN-2007KE 1 ACS/WFC ACCUM WFC1-CTE F606W 3 none none none 1 572.0 S SN-2007KE 1 ACS/WFC ACCUM WFC1-CTE F606W 4 none none none 1 572.0 S SN-2007KE 2 ACS/WFC ACCUM WFC1-CTE F435W 1 none none none 2 604.0 S SN-2007KE 2 ACS/WFC ACCUM WFC1-CTE F435W 2 none none none 2 604.0 S SN-2007KE 2 ACS/WFC ACCUM WFC1-CTE F435W 3 none none none 2 604.0 S SN-2007KE 2 ACS/WFC ACCUM WFC1-CTE F435W 4 none none none 2 604.0 S 13698( 9) - 23-Sep-2014 15:58:36 - [ 8] Visit: 04 Visit Requirements: ORIENT 139D TO 161 D On Hold Comments: Additional Comments: 3 point line dither will be used to obtain F606W and F438W observations over half an orbit each of the location of SN 2001co. These observations used the UVIS-2k2c-SUB subarray to combat buffer issues due to short exposure lengths. Halpha (F665N) observations will be taken over the subsequent orbit using the same aperture. 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 SN-2001CO WFC3/UVI ACCUM UVIS2-2K2 F606W 1 330 S (990 POS TARG S C-SUB S) 10.84068327360652, 8.328183421021627; GS ACQ SCENARIO SINGLE; PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2001CO WFC3/UVI ACCUM UVIS2-2K2 F438W FLASH=9 1 330 S (990 POS TARG S C-SUB S) 10.84068327360652, 8.328183421021627; PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-2001CO WFC3/UVI ACCUM UVIS2-2K2 F665N FLASH=9 1 880 S POS TARG S C-SUB (2640 S) 10.84068327360652, 8.328183421021627; PATTERN 3 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2001CO 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB SN-2001CO 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB SN-2001CO 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB SN-2001CO 2 WFC3/UVI ACCUM UVIS2-2K F438W 1 none none none 1 N/A S 2C-SUB SN-2001CO 2 WFC3/UVI ACCUM UVIS2-2K F438W 2 none none none 1 N/A S 2C-SUB SN-2001CO 2 WFC3/UVI ACCUM UVIS2-2K F438W 3 none none none 1 N/A S 2C-SUB SN-2001CO 3 WFC3/UVI ACCUM UVIS2-2K F665N 1 none none none 2 N/A S 2C-SUB SN-2001CO 3 WFC3/UVI ACCUM UVIS2-2K F665N 2 none none none 2 N/A S 2C-SUB 13698( 9) - 23-Sep-2014 15:58:36 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2001CO 3 WFC3/UVI ACCUM UVIS2-2K F665N 3 none none none 2 N/A S 2C-SUB 13698( 9) - 23-Sep-2014 15:58:36 - [ 10] Visit: 05 Visit Requirements: ORIENT 312D TO 328 D; ORIENT 133D TO 145 D On Hold Comments: Additional Comments: 3 point line dither will be used to obtain F606W and F438W observations over half an orbit each of the location of SN 2001co. These observations used the UVIS-2k2c-SUB subarray to combat buffer issues due to short exposure lengths. Halpha (F665N) observations will be taken over the subsequent orbit using the same aperture. 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 SN-2003DG WFC3/UVI ACCUM UVIS2-2K2 F606W 1 330 S POS TARG S C-SUB see below 8.819788488036544, (978 S) 9.08589194666145; PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2003DG WFC3/UVI ACCUM UVIS2-2K2 F438W FLASH=9 1 330 S POS TARG S C-SUB see below 8.819788488036544, (978 S) 9.08589194666145; PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-2003DG WFC3/UVI ACCUM UVIS2-2K2 F665N FLASH=9 1 880 S POS TARG S C-SUB see below 8.819788488036544, (2625 S) 9.08589194666145; PATTERN 3 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2003DG 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 326.0 S S 2C-SUB SN-2003DG 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 326.0 S S 2C-SUB SN-2003DG 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 326.0 S S 2C-SUB SN-2003DG 2 WFC3/UVI ACCUM UVIS2-2K F438W 1 none none none 1 326.0 S S 2C-SUB SN-2003DG 2 WFC3/UVI ACCUM UVIS2-2K F438W 2 none none none 1 326.0 S S 2C-SUB SN-2003DG 2 WFC3/UVI ACCUM UVIS2-2K F438W 3 none none none 1 326.0 S S 2C-SUB SN-2003DG 3 WFC3/UVI ACCUM UVIS2-2K F665N 1 none none none 2 875.0 S S 2C-SUB SN-2003DG 3 WFC3/UVI ACCUM UVIS2-2K F665N 2 none none none 2 875.0 S S 2C-SUB SN-2003DG 3 WFC3/UVI ACCUM UVIS2-2K F665N 3 none none none 2 875.0 S S 2C-SUB 13698( 9) - 23-Sep-2014 15:58:36 - [ 11] Summary Form for Proposal 13698 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-2K2C-SUB, WFC1-CTE, WFC2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO SINGLE, ORIENT 133D TO 145 D, ORIENT 139D TO 161 D, ORIENT 163D TO 177 D, ORIENT 250D TO 300 D, ORIENT 312D TO 328 D, ORIENT 352D TO 20 D, ORIENT 40D TO 55 D, PATTERN 1 1, PATTERN 1 2, PATTERN 3 1, PATTERN 3 2, PATTERN 3 3, POS TARG -1.9911196793179953, -3.0397210319149726, POS TARG -9.29885365064924, -12.702731862764875, POS TARG 10.84068327360652, 8.328183421021627, POS TARG 8.819788488036544, 9.08589194666145, POS TARG 87.38451032464434, -31.705764036529335 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W, F438W, F606W, F665N ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-2001CO, SN-2003DG, SN-2003DR, SN-2005E, SN-2007KE ------------------------------------------------------------------------------------------------------------------------------------