0 Assigned ID: 761 ----- Attempting Submission 1 (Fri Feb 24 21:51:11 GMT 2012) ----- Triggering on SN 2013dh. Added visit 61. -1776473554 ----- Attempting Submission 1 (Sat Jul 07 21:11:07 GMT 2012) ----- HST Phase II Proposal 12973 (phase-2.apt) successfully submitted. ----- Attempting Submission 2 (Wed Aug 01 17:56:24 GMT 2012) ----- ----- Attempting Submission 3 (Mon Jun 17 16:37:35 GMT 2013) ----- HST Phase II Proposal 12973 (sn2013dh.apt) successfully submitted. ----- Attempting Submission 4 (Mon Jun 17 16:39:22 GMT 2013) ----- HST Phase II Proposal 12973 (sn2013dh.apt) successfully submitted. ----- Attempting Submission 5 (Mon Jun 17 18:42:32 GMT 2013) ----- ----- Attempting Submission 6 (Fri Jun 21 19:45:39 GMT 2013) ----- ----- Attempting Submission 7 (Sat Jun 22 01:16:01 GMT 2013) ----- resubmission to redo failed visit. UV Spectroscopy of a Peculiar White Dwarf Supernova While type Ia supernovae (SNe Ia) have been extremely useful for studying the cosmic expansion history, their explosion mechanism and progenitor system remain unsolved problems. Moreover, as large samples of SNe are observed, the diversity among these explosions has grown: not all exploding white dwarfs look like normal SNe Ia. Understanding why these "peculiar" objects are different from the normal ones can help explain the standard SN Ia scenario, as well as give us a better understanding of the many endpoints of stellar evolution. Connecting observations to physical models has been difficult for both normal and peculiar white dwarf supernovae. The ultraviolet is an unexplored wavelength region for peculiar SNe Ia; the high opacity in the UV from typical thermonuclear burning products means that the UV flux in white dwarf supernovae is very sensitive to the outermost layers of ejecta. This material is the least processed, and is thus an ideal place to look for clues to progenitors and explosion mechanisms. Here we propose target-of-opportunity UV spectroscopy of a peculiar white dwarf SN using the STIS NUV-MAMA instrument to add a unique piece of the puzzle connecting peculiar SNe Ia and their progenitors. Our goal is to observe a single peculiar white-dwarf supernova using the STIS CCD for optical spectra and the STIS NUV_MAMA instrument for the near-UV. Many peculiar SNe Ia are faint, so we will restrict ourselves to low redshift events (z < 0.03). Peculiar SNe Ia evolve differently in the UV than their normal counterparts; we will therefore have two visits on our object. The first will be 2 of our 6 allotted orbits, with approximately half of an orbit being used for the optical spectrum using the STIS CCD, and the other 1.5 orbits being used for the STIS NUV-MAMA spectrum. This visit should cover the SN at maximum or prefereably a few days before maximum. By the time of the second visit, the SN will have faded considerably. The second visit will consist of 4 orbits: 0.5 orbits for the STIS CCD optical spectrum and 3.5 orbits with the NUV-MAMA instrument. We request that the second visit be scheduled approximately 1 week after the initial visit. This is a ToO proposal - we would like to trigger on SN 2013dh in NGC 5936. No realtime requirements. No special calibrations required. HOT STARS 12 false false 0.0 0.0 false false false SUPPORTED STAR SUPERNOVA TYPE IA J2000 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 Timing link suitability includes constraints ([02 After 01 by 5.0 to 9.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /private/var/folders/jz/0x6fxq6j4sb70m3vjknhgw2h0000gn/T/OPVisit9038581195808665332.xml 1371808093000 131.00329715502448 (Tic-Visit :proposal-id 12973 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "21-Jun-2013 21:11:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 321648 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12973 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12973 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3129 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12973 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 561 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3129 :pcs-gap 0 ) true 2 0 Target of Opportunity The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /Users/saurabh/proposals/hst.cycle20.curtis/visit61/OP-cache/visit61-phase2-v51.xml (Tic-Visit :proposal-id 12973 :visit-id "51" :proposal-version -1 :trans-version "20130502" :date "21-Jun-2013 20:58:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 321648 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12973 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12973 :visit-id "51" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3129 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12973 :visit-id "51" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2888 :al-overhead-at-end 0 :internal-dur-at-end 561 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3129 :pcs-gap 0 ) true 2 0 Target of Opportunity The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /Users/saurabh/proposals/hst.cycle20.curtis/visit61/OP-cache/visit61-phase2-v61.xml (Tic-Visit :proposal-id 12973 :visit-id "61" :proposal-version -1 :trans-version "20130502" :date "21-Jun-2013 20:58:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 174416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12973 :visit-id "61" :obset-id "61" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12973 :visit-id "61" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2777 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3129 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12973 :visit-id "61" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2888 :al-overhead-at-end 85 :internal-dur-at-end 394 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3129 :pcs-gap 0 ) true 2 0 Target of Opportunity Timing link suitability includes constraints ([02 After 01 by 5.0 to 9.0 days]) The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /private/var/folders/jz/0x6fxq6j4sb70m3vjknhgw2h0000gn/T/OPVisit8158315974492667735.xml 1372290491000 130.44992932654333 (Tic-Visit :proposal-id 12973 :visit-id "02" :proposal-version -1 :trans-version "20130502" :date "21-Jun-2013 21:11:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 478208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12973 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12973 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2717 :al-overhead-at-end 0 :internal-dur-at-end 113 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3071 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12973 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2828 :al-overhead-at-end 85 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3071 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12973 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2828 :al-overhead-at-end 85 :internal-dur-at-end 132 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3071 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12973 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2828 :al-overhead-at-end 0 :internal-dur-at-end 620 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3071 :pcs-gap 0 ) true 4 0 Target of Opportunity