12295( 3) - 11-Jun-2010 13:49:59 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12295 Version: 3 Check-in Time: 11-Jun-2010 13:49:59 STScI Edit Number: 0 Title Searching for the Progenitor of the Type Ib Supernova 2010O ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Howard E. Bond Space Telescope Science Institute CoI: Dr. Alessandra Aloisi Space Telescope Science Institute N CoI: Dr. Catherine D. Garmany National Optical Astronomy Observatory, N AURA CoI: Dr. Bethan James Space Telescope Science Institute N CoI: Mr. Jack Newton Puckett Observatory Supernova Search N CoI: Mr. Tim Puckett Puckett Observatory N CoI: Dr. Sangmo Tony Sohn Space Telescope Science Institute N CoI: Dr. Roeland P. van der Marel Space Telescope Science Institute N CoI: Dr. Gijs Nelemans Radboud Universiteit Nijmegen N CoI: Dr. Rasmus Voss Max-Planck-Institut fur extraterrestrische N Physik CoI: Mr. Mikkel Nielsen Radboud Universiteit Nijmegen N ------------------------------------------------------------------------------------ Abstract Several progenitor stars of Type II supernovae (SNe) have been identified in archival pre-explosion HST images. All of them are consistent with being red supergiants, as had been expected but never actually confirmed until the advent of HST imaging. The hydrogen-deficient Type Ib and Ic SNe are in a less satisfactory state. They are believed to be core-collapse SNe arising from massive stars that have lost their H envelopes. Unfortunately, though, there has never been an identified progenitor of an SN Ib or Ic, so it remains uncertain whether they are massive Wolf-Rayet stars, or less-massive stars in interacting binaries. The appearance of the Type Ib SN 2010O, in the starburst interacting galaxy NGC 3690 (Arp 299), offers a tantalizing new opportunity. NGC 3690 has been the subject of extensive HST observations, ranging from the UV and optical to the near-IR. We obtained ground-based images of SN 2010O, and find that there is a blue cluster in the archival HST images close to the nominal SN position. If the SN did indeed arise in this cluster, its spectral energy distribution, obtained from the HST archival data, constrains the turnoff mass to about 14 Msun. SN 2010O has also become even more interesting because of its close proximity to a variable X-ray source discovered by our team in pre-explosion Chandra images. Both of these findings would support the interacting-binary origin of this SN Ib. The astrometric precision possible from our ground-based images is insufficient to verify the location of SN 2010O conclusively. We therefore propose a set of short WFC3 exposures, while the SN is still luminous, in order to confirm the association of the SN with the young cluster and with the X-ray source. ------------------------------------------------------------------------------------ 12295( 3) - 11-Jun-2010 13:49:59 - [ 2] Observations Description ------------------------ The observations consist of WFC3/UVIS images of the interacting galaxies NGC 3690/Arp 299, for the primary purpose of precision astrometry of two supernovae while they are still bright, SN 2010O and SN 2010P. The astrometry will allow us to determine the precise locations of these SNe in pre-outburst archival HST images. We will take dithered exposures of 2 frames each in the U (F336W), B (F438W), and I (F814W) filters. We are placing the two SNe in chip 2, away from the chip gap, so as to center the galaxies better in the field, thus adding to the value of our images to the archive. To make sure that the SNe are not near the gap, we are constraining the ORIENT angle, and we include a BEFORE requirement to make sure that the SNe will still be bright enough to be detected at reasonably high S/N. The chosen dither pattern will fill in the chip gap. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12295( 3) - 11-Jun-2010 13:49:59 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2010O EXT-STAR, MXB, RA=11H28M29.0000S +/- 0.1", J2000 V = 21 SUPERNOVA, SUPERNOVA DEC=+58D34'7.00" +/- 0.1" TYPE IB Reference Frame: ICRS Comments: Primary target SN 2010O is at 11 38 33.86 +58 33 51.6 and secondary target SN 2010P is at 11 28 31.38 +58 33 49.3. The pointing entered above covers both targets (in chip 2), while placing most of the host galaxy well within the field of view. ------------------------------------------------------------------------------------------------------------------------------------ 12295( 3) - 11-Jun-2010 13:49:59 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 2.428 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.772 Angle_Between_Sides Center_Pattern YES Pattern_Comments: Purpose of this pattern is to bridge the gap between the WFC3 chips, as well as subpixel dithering. ------------------------------------------------------------------------------------------------------------------------------------ 12295( 3) - 11-Jun-2010 13:49:59 - [ 5] Visit: 01 Visit Requirements: SCHED 40%; ORIENT 75D TO 95 D; BEFORE 10-JUL-2010:00:00:00 On Hold Comments: Additional Comments: ORIENT requirement ensures that chip gap will not be near either of the two main targets. BEFORE date is because targets are supernovae which are fading, and must be observed as soon as practicable. Both constraints can be relaxed somewhat if necessary for scheduling. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2010O WFC3/UVI ACCUM UVIS F336W CR-SPLIT=NO 1 395 S PATTERN 1 1-3 S ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2010O WFC3/UVI ACCUM UVIS F438W CR-SPLIT=NO 1 370 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2010O WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 370 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2010O 1 WFC3/UVI ACCUM UVIS F336W 1 none none none 1 N/A S SN2010O 1 WFC3/UVI ACCUM UVIS F336W 2 none none none 1 N/A S SN2010O 2 WFC3/UVI ACCUM UVIS F438W 1 none none none 1 N/A S SN2010O 2 WFC3/UVI ACCUM UVIS F438W 2 none none none 1 N/A S SN2010O 3 WFC3/UVI ACCUM UVIS F814W 1 none none none 1 N/A S SN2010O 3 WFC3/UVI ACCUM UVIS F814W 2 none none none 1 N/A S 12295( 3) - 11-Jun-2010 13:49:59 - [ 6] Summary Form for Proposal 12295 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 10-JUL-2010:00:00:00, ORIENT 75D TO 95 D, PATTERN 1 1-3, SCHED 40% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W, F438W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2010O ------------------------------------------------------------------------------------------------------------------------------------