This is a revised submission, with ORIENT ranges changed to allow for more flexible schedulability. ----- Attempting Submission 1 (Fri Jul 06 19:24:05 GMT 2012) ----- HST Phase II Proposal 12885 (kep_v6.apt) successfully submitted. ----- Attempting Submission 2 (Mon Jul 09 23:32:08 GMT 2012) ----- Kepler's SNR: A Type Ia Supernova from a Single Degenerate System? Kepler's supernova remnant (SN1604) is now known to be the result of a Type Ia supernova explosion. The SN occurred in a region modified by the circumstellar material from the progenitor system, thus implying a likely single degenerate precursor. We request second epoch HST images of the remnant with WFC3 (first epoch was in 2003 with ACS) in order to (i) carry out a careful and accurate assessment of the proper motion of the primary blast wave and, with improved modeling of the primary shock velocity, constrain the distance to this important object, and (ii) perform a sensitive search for any possible surviving companion star to the SN progenitor that should still be present near the center of the remnant. Resolving the distance uncertainty is key to understanding the dynamics of the system and establishing an accurate explosion energy for the SN, thus putting Kepler in the context of other Type Ia SNe. Constraining the precursor system by finding or placing stringent limits on a companion star could help answer one of the key outstanding questions about Type Ia SNe: how are they produced? Our second epoch observations will also allow us to measure the kinematics and brightness changes of the radiative knots and filaments, which arise from interactions between the blast wave and the densest portions of the circumstellar medium, and hence are tied to the evolution of the progenitor system. These changes can be seen to occur at ground-based resolution on a ~10 year timescale, but our first epoch data have shown that HST angular resolution is necessary to resolve the knot structures and complexes and accurately characterize these changes. WFC3 images will be obtained using two narrowband filters F656N and F658N, and four continuum filters, F336W, F438W, F547M and F814W. We will use 4 orbits for F656N, 2 orbits for F658N and 2 orbits total for the four continuum bands. All observations will use CR-SPLITS, offsets and dither patterns. We would prefer obtaining images at the same orientation as in our Cycle 12 program. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false SUPPORTED ISM EMISSION LINE NEBULA SNR J2000 J2000 4.4E-16 erg s-1 cm-2 arcsec-2 Faint H-alpha WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F658N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F814W POS-TARG DITHER DITHER 2 2.414 WFC3-UVIS-DITHER-LINE false true 0.145 2 85.759 POS-TARG WFC3-UVIS-GAP-LINE 46.84 3 true Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 20.2. 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CASM was run in Phase II mode. /Users/rsankrit/Research/Proposals/HST_Cycle20/PhaseII/OP-cache/kep_v7-v02.xml (Tic-Visit :proposal-id 12885 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "09-Jul-2012 16:07:30.0" :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 2309968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12885 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12885 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2911 :al-overhead-at-end 122 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12885 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3019 :al-overhead-at-end 122 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) true 2 0 Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /Users/rsankrit/Research/Proposals/HST_Cycle20/PhaseII/OP-cache/kep_v7-v03.xml (Tic-Visit :proposal-id 12885 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "09-Jul-2012 16:07:43.0" :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 2309968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12885 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12885 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2910 :al-overhead-at-end 122 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12885 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3022 :al-overhead-at-end 122 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) true 2 0