A Search for Surviving Companions of Type Ia Supernovae in the Large Magellanic Cloud

0 Assigned ID: 2100 Submission failed due to an error: java.lang.NullPointerException Submission failed due to an error: java.lang.NullPointerException Submission failed due to an error: java.lang.NullPointerException Submission failed due to an error: java.lang.NullPointerException Submission failed due to an error: java.lang.NullPointerException ----- Attempting Submission 1 (Sat Mar 02 01:04:09 GMT 2013) ----- 0 ----- Attempting Submission 1 (Thu Jun 27 15:39:12 GMT 2013) ----- A Search for Surviving Companions of Type Ia Supernovae in the Large Magellanic Cloud Type Ia Supernovae (SNe) are widely recognized for their use as standardizable candles. There are two contrasting theories for their origin: a double-degenerate origin that is the result of the merger of two white dwarfs (WDs) and a single-degenerate origin in which a WD accretes material from a non-degenerate companion. The identification of surviving companions indicates a single-degenerate origin and, by comparing observations to model predictions, we can identify potential companions in the region of the SNR. The LMC is an ideal environment for the observation of SNe due to its proximity, orientation, and relatively low extinction. We have identified 9 Type Ia SNRs in the LMC that lack full data sets but are suitable for a search for surviving companions. We request B, V, I, and H-alpha observations of these SNRs. Photometry from these regions will enable us to find potential surviving companions. We further request J and H band observations of SNR 0509-67.5 in order to determine the spectral energy distribution and the nature of a point source in a diffuse patch of emission near its center. We will also use the BVI images to determine the star formation history in order to constraint the delay time of these Type Ia SNe. This program is designed to make a sensitive search for survivor companions to SN Ia progenitors using WFC3. The observations make use of WFC3/UVIS to obtain F475W, F555W, F814W ( roughly B, V, I-bands) and F656N (H-alpha) to probe the stellar population in the vicinity of nine LMC Type Ia supernova remnants (SNRs). Based on model predictions a wide range of possible survivor companions could potentially exist, this program is designed to obtain observations that can identify as wide a range as possible among the possible survivor types. The narrow-band H-alpha images will provide a detailed view of the nebular structure and enable the assessment of the geometric center of each SNR. Our phase 1 proposal contains a more detailed description of our program goals and rationale. For most of our targets a single visit of two orbits is used to obtain the observations. Two targets (SNR 0509-67.5 and SNR 0519-69.0) have existing HST observations, these observations therefore differ in that they are meant to supplement those existing observations and require a single a single orbit to execute. The observations of each target have been tuned based on the size and morphology of the individual target. Below, we first describe the general observations and then give brief descriptions of the differences employed for each object. A typical two-orbit visit of a target obtains a single short exposure (20s) in each of the F475W, F555W, and F814W filters. These are needed as some of the possible survivor companions might have magnitidus as bright as V=17 mag. The short exposures are designed to obtain unsaturated measurements for sources as bright as V=15 mag. The remainder of the observations are comprised of 3-dithered exposures per broad band filter with typical exposure times of ~350 s. These are grouped such that the F475W and F555W observations occur in the first orbit and the F656N and F814W exposures occur in the second orbit. The dither pattern used depends on the remnant size, with smaller remnants placing the target field centered in the UVIS1 detector and using small offsets following the WFC3-UVIS-DITHER-LINE-3pt pattern. Those offsets are provided as POS-TARG in order to facilitate mixing short and long exposures with minimal space-craft motion (and in the case of SNR 0509-69.0 to accomodate different exposure configurations for each of the WFC3/IR exposures. The larger remnants all employ the WFC3-UVIS-GAP-LINE pattern with the center option turned off to faciliate an offset of the pattern in some cases. All exposures use the FLASH option to make sure a background of roughly 10-12 e- is present to compensate for CTE issues in WFC3. The specifc times used are based upon the results found in (WFC3-2012-12_v1_0). In addition we have made new checks using the WFC3 ETC to reassure ourselves the science goals are still possible. The SNR 0509-69.0 observations (Visit 01) differ most from the others as this object has specific goals to probe the nature of a source near the center of that SNR. There WFC3/IR F110W and F160W observations will help better determine whether this source might be a background galaxy or nebular patch with an embedded point source. The WFC3/UVIS F814W observations will supplement existing archival observations. No short exposures are needed for this object. A single orbit is necessary to acquire these observations The SNR 0519-67.5 observations (Visit 02) need only obtain F475W and F814W observations as previous F656N and F550M observations already exist. A single orbit is need for these observations. Furthermore, this target is small enough that the necessary observations can be obtain using one of the WFC3/UVIS ccds so the UVIS1 aperture and a small dither pattern is employed to obtain sub-pixel sampling. The SNR N103B observations (Visit 03) use the small size of the remnant and place the target on the UVIS1 aperture. We note that observations of a nearby interstellar structure can also be obtained by constraining the observations to have an ORIENT between 120 and 245 degrees. This contraint was not included in the phase 1 proposal but in discussing with our technical contact how me might construct an observation that used a different aperture depending on the spacecraft orientation at the time of the observations they suggested instead including this constraint (since it was both a very broad constraint and was simpler to schedule). If this constraint is not permitted we request to try and use our other option, setting the UVIS1 vs. UVIS2 aperture depending on the ORIENT at the time of scheduling. The SNR DEML 71 observations (visit 04) observations are still closer to the nominal/typical description given above. The single difference from the other observations is that a small offset is used so that the UVIS-CENTER apeture can be used but to offset the chip gap slightly from the nebular center. The short exposure use the UVIS1 aperture as the nebula mostly fits with the CCD and the most likely site for a bright companion is near the remnant center. The SNR 0548-70.4 observations (visit 05) are similar to those in visit 04 except the offset of the UVIS-CENTER aperture is slightly smaller to accomodate the slightly larger size of this remnant. The SNR DEML 316A observations (visit 06) have had their coordinates updated slightly compared to the original proposal so that the observations also cover the interaction region between SNR DEML 316A and SNR DEML 316B without any further constraint. The SNR DEML 249 and SNR DEML 238 observation (visit 07 and 08, respectively) have no offset of the UVIS-CENTER aperture as these remnants barely fit within the field-of-view of WFC3. The short exposure use the UVIS1 and target only the remnant center (rather than have the chip gap run directly through the remnant center). Finally the SNR 0454-67.7 observation (visit 09) also have no offset but now do not employ any offset for the short exposures, because this remnants morphology is poorly understood (possibly due to interaction with its surroundings) and so the center is poorly defined. RESOLVED STELLAR POPULATIONS Default false false false false false SUPPORTED EXT-STAR SUPERNOVA SUPERNOVA TYPE IA This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F475W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N POS-TARG MOSAIC DITHER 4 2.414 Centering turned off for sources with offset. WFC3-UVIS-DITHER-BOX false 81.785 false 0.112 0.173 3 85.759 POS-TARG WFC3-UVIS-GAP-LINE 23.884 3

false

1372347002420 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v01.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:30:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1788912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3249 :al-overhead-at-end 120 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 1 0 1372347034484 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v02.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "02" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:30:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2310000 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3249 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 1 0 1372347167727 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v03.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "03" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:32:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3249 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3352 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 2 0 1372347152739 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v04.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "04" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:32:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3249 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3352 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 2 0 1372347137928 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v05.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "05" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:32:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3302 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3413 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) true 2 0 1372347193535 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v06.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "06" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:33:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3249 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "06" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3352 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 2 0 1372347211762 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v07.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "07" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:33:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3302 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "07" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3413 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) true 2 0 1372347232561 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v08.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "08" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:33:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3302 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "08" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3413 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3635 :pcs-gap 0 ) true 2 0 1372347247789 /data/wolf/gruendl/docs/prop/HST/Cycle21/SNR/phase2/OP-cache/SNR1a_ver1-v09.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13282 :visit-id "09" :proposal-version -1 :trans-version "20130502" :date "27-Jun-2013 10:34:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4331248 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13282 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13282 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3249 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13282 :visit-id "09" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3352 :al-overhead-at-end 125 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3582 :pcs-gap 0 ) true 2 0