0 Assigned ID: 1018 ----- Attempting Submission 1 (Fri Apr 08 23:31:48 GMT 2016) ----- HST Phase I Proposal 1018 (24_0509.apt) successfully submitted. Receipt: # 1018-1 0 ----- Attempting Submission 1 (Wed Jul 06 20:19:29 GMT 2016) ----- HST Phase II Proposal 14733 (24_0509.apt) successfully submitted. Receipt: # 14733-1 ----- Attempting Submission 2 (Wed Jul 06 20:21:48 GMT 2016) ----- HST Phase II Proposal 14733 (24_0509.apt) successfully submitted. Receipt: # 14733-2 ----- Attempting Submission 3 (Wed Jul 06 21:09:29 GMT 2016) ----- Observations of Ia supernovae have been invaluable in measuring distances on cosmological scales and led to the discovery of the accelerating universe. Even though it is accepted that these supernovae are the result of thermonuclear explosions of accreting white dwarf stars, little is known on the progenitor systems. One important tool in constraining these systems is the observations of supernova remnants. The remnant 0509-67.5 is of particular interest in this endeavor due to its remarkably circular structure and being situated in the Large Magellanic Cloud (LMC). Being located in the LMC, we know the distance to this remnant to greater accuracy than any of the galactic remnants. This enables us to translate the proper motion measurements of the forward shock into physical units of velocity, which we have done in Hovey et al. (2015). Using these measurements we are able to assess a dynamical offset of the explosion site from the geometric center of the remnant in the east-west plane. Unfortunately we are unable to make this measurement in the north-south plane due to our second epoch observation being imaged with the WFPC2 camera after the ACS camera failed. We are requesting a third observation of 0509-67.5 with the ACS camera so we can fully constrain the search radius for a possible surviving companion star. With a third epoch observation, we will be able to measure the proper motions around the entire rim to with much higher precision than those in Hovey et al. (2015) and place the best constraint on possible progenitor companion. This measurement is not technically challenging, but will deepen our knowledge of the progenitor systems of Ia supernovae. We have been awarded two orbits of HST time to obtain a third epoch observation of the LMC supernova remnant 0509-67.5 in order to measure the proper motions of the forward shock where the S/N was too low in our second epoch WFPC2 observation. Hence, we ask for a standard 4-point box dither pattern with the ACS WFC camera using a F658N narrow-band filter. This data will be used to constrain the search area for surviving companion stars under the single-degenerate model of Ia supernovae. Stellar Physics 12 false false false false false false SUPPORTED ISM SNR YES J2000 J2000 ACS/WFC Imaging No No F658N POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false /Users/lukehovey81/Downloads/cycle_24_0509/OP-cache/24_0509-v01.xml 1467831073197 The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. We ask that this be on WFC-2 and the roll angle be as close to -28.7994 degrees (or 331.2006) as possible (determined from taking the PA_APER keyword of -31.2714 from the 2006 ACS WFC observation of 0509-67.5, then subtracting $\beta_y$ of 177.528 for the WFC and then adding 180 degrees, as per the instructions found here: http://www.stsci.edu/hst/acs/documents/handbooks/cycle19/c07_obstechniques09.html in section 7.8.1) so that the PSFs of the image is nearly identical of the ACS observation taken in 2006 ID#11015 so that proper motions can be measured in low S/N portions of the remnant's rim. (Tic-Visit :proposal-id 14733 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "06-Jul-2016 12:51:13.0" :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 14733 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14733 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3223 :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 3556 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14733 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3334 :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 3556 :pcs-gap 0 ) true 2 0