Are the Progenitors of SN 2002cx-like Objects Massive Stars or White Dwarfs?

Assigned ID: 800 ----- Attempting Submission 1 (Fri Feb 24 22:14:45 GMT 2012) ----- ----- Attempting Submission 1 (Wed Jul 11 02:27:34 GMT 2012) ----- ----- Attempting Submission 2 (Wed Jul 11 16:42:51 GMT 2012) ----- Are the Progenitors of SN 2002cx-like Objects Massive Stars or White Dwarfs? The largest class of "peculiar" supernovae (SN) is the SN 2002cx-like class. The SN are observationally similar to Type Ia SN, but with several differences that separate them into their own class. The recently discovered SN 2008ha, which is a member of the class, was extremely faint (M_V = -14.2 mag) and ejected only 0.3 M_sun of material. Despite its similarities to SN Ia, clearly it did not fully disrupt a Chandrasekhar-mass white dwarf. This discovery provoked some to question if it was the result of a massive star whose core collapsed to a black hole shortly after creation of a proto-neutron star, allowing only a small amount of ejecta to escape and creating a weak electromagnetic signature. We propose to observe the SN sites of four very nearby (D < 20 Mpc) members of this class, allowing us to resolve stars in the vicinity of the SN, and place estimates and/or limits on the mass of the progenitor star. If these SN come from massive stars, we should detect other massive stars in their neighborhood. Constraining the progenitors of these objects has far-reaching implications for stellar evolution, SN physics, metal enrichment, and black hole creation rates. This simple experiment should determine if the progenitors were massive stars or white dwarfs. We plan to get ACS images of the host galaxies and immediate progenitor environments of 4 supernovae. We want BVRI photometry to properly characterize the stellar populations and dust content of the galaxies. We hope to split the time 30,20,20,30% between BVRI. There are two orbit blocks for each target. For two targets (larger galaxies), we specified orientations that will maximize the galaxy on the instrument. HOT STARS 12 false 0.0 0.0 false false false false SUPPORTED GALAXY ELLIPTICAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY SPIRAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY SPIRAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY SPIRAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F625W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F625W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F625W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F625W ACS/WFC Imaging No No F814W POS-TARG DITHER 3.011 LINE false false 2 85.28 ACS-WFC-DITHER-LINE 1

false

1341973628038 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Orientations were chosen to get most of the galaxy. They can be expanded, but the science will be impacted somewhat. The more of the galaxy, the better. The best angles are near 145 and 335. (Tic-Visit :proposal-id 12999 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "10-Jul-2012 22:27:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12999 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12999 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2690 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12999 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2799 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3024 :pcs-gap 0 ) true 2 0 1341973630480 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12999 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "10-Jul-2012 22:27:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12999 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12999 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2682 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12999 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2791 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 /private/var/folders/Ea/Eaj9SYFeEtC0NyYIIjweME+++TM/-Tmp-/OPVisit6928840821452777500.xml 1342024838581 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12999 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "11-Jul-2012 12:40:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12999 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12999 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3158 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3491 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12999 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3267 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3491 :pcs-gap 0 ) true 2 0 1341973634901 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Orientations were chosen to get most of the galaxy. They can be expanded, but the science will be impacted somewhat. The more of the galaxy, the better. In particular, I was trying to get the bright spiral arm to the north east. The best angles are near 230. (Tic-Visit :proposal-id 12999 :visit-id "04" :proposal-version -1 :trans-version "20120604" :date "10-Jul-2012 22:27:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12999 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12999 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2690 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12999 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2799 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 2 0