4 For 1: UV Spectroscopy of a Young, Nearby SN Ia, Cepheid Distances to 2 SN Ia, and Extremely Late-time Photometry of Another SN Ia

This target is not used in this proposal. DD proposal for new supernova, 4 for 1 Fixed a mislabeled figure 1301635851 Assigned ID: 18 ----- Attempting Submission 1 (Wed Mar 15 22:21:17 GMT 2017) ----- HST Phase I Proposal 18 (submitted_4_for_1.apt) successfully submitted. Receipt: # 18-1 ----- Attempting Submission 2 (Thu Mar 16 00:12:52 GMT 2017) ----- Looks ok from here This target is not used in this proposal. Renumbered the CCD visits as 11-14, to make it easier for the schedulers to determine which visits will be used. -980648012 ----- Attempting Submission 1 (Mon Mar 20 22:10:07 GMT 2017) ----- HST Phase II Proposal 14925 (14925.apt) successfully submitted. Receipt: # 14925-1 Will take care of those later. 4 For 1: UV Spectroscopy of a Young, Nearby SN Ia, Cepheid Distances to 2 SN Ia, and Extremely Late-time Photometry of Another SN Ia We recently discovered the Type Ia supernova (SN Ia) SN 2017cbv in NGC 5643 (D ~ 15 Mpc) within hours of explosion. The SN is about 10 days before peak, which will be at V ~ 12 mag, making it one of the brightest SN of the decade. This SN represents a rare opportunity to obtain a UV spectroscopic time series for a young/bright SN Ia. With such a UV data set, we will determine the metal abundance of the progenitor star and investigate how that metallicity affects SN distance calibration, one of the largest systematics for SN cosmology. Fortuitously, with only a modest increase in the number of orbits, we can simultaneously obtain a precise Cepheid distance to NGC 5643. While we obtain the UV spectra, we will observe Cepheid variables with WFC3 in parallel. Four years ago, there was another SN Ia, SN 2013aa, in NGC 5643. Therefore this single Cepheid measurement would add 2 SN-Cepheid calibrators, increasing the sample size by 10% with one set of observations! The number of SN-Cepheid calibrators is the largest uncertainty for measuring the local Hubble constant, and we significantly improve the measurement of H0 with a relatively small orbit request. Finally, the location of SN 2013aa falls into our Cepheid fields, allowing for a deep observation of a SN Ia 4 years after explosion. At this epoch, 57Co and 55Fe dominate the SN luminosity, and a measurement of the luminosity at this epoch compared to earlier times constrains the ratio of 56Ni to 57Co and 55Fe generated in the explosion. Those ratios are strongly dependent on the explosion mechanism and progenitor system, and our observations will help distinguish between these scenarios for SN 2013aa. We would like to observe the SN as soon as possible. We are aiming to get multiple epochs of UV spectra separated by roughly 2 days each (specific timing is listed in the visits) and covering roughly 10 days total. In parallel, we will observe the host galaxy in multiple filters. Those observations should cover the position of SN 2013aa. Stellar Physics Cosmology 0 SUPPORTED STAR SUPERNOVA TYPE IA J2000 J2000 STAR SUPERNOVA TYPE IA J2000 J2000 STIS/NUV-MAMA Spectroscopic No No G230L 2376 WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F160W 1490055312294 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit5806847494202413242.xml 51 (Tic-Visit :proposal-id 14925 :visit-id "01" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:12.0" :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 1242400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2727 :al-overhead-at-end 114 :internal-dur-at-end 1062 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3060.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055313404 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit5289467559405310786.xml 51 After visit 01 by 24 to 60 hours. (Tic-Visit :proposal-id 14925 :visit-id "02" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:13.0" :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 1242400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2727 :al-overhead-at-end 114 :internal-dur-at-end 1062 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3060.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055314609 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit2618568200650963494.xml 52 After visit 01 by 3 to 6 days. (Tic-Visit :proposal-id 14925 :visit-id "03" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:14.0" :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 1242400 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2787 :al-overhead-at-end 114 :internal-dur-at-end 1062 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3120.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055315839 Hst Same orient constraint links visits (01 02 03 04) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit1852298873756616770.xml 53 After visit 01 by 8 to 11 days. (Tic-Visit :proposal-id 14925 :visit-id "04" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:15.0" :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 1259840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2847 :al-overhead-at-end 198 :internal-dur-at-end 987 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055317726 Hst Same orient constraint links visits (11 12 13 14) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit7186859851534647896.xml 51 (Tic-Visit :proposal-id 14925 :visit-id "11" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:17.0" :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 1210624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2727 :al-overhead-at-end 114 :internal-dur-at-end 1028 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3060.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055318900 Hst Same orient constraint links visits (11 12 13 14) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit6893231220002512023.xml 51 After visit 11 by 24 to 60 hours. (Tic-Visit :proposal-id 14925 :visit-id "12" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:18.0" :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 1210624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "12" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2727 :al-overhead-at-end 114 :internal-dur-at-end 1028 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3060.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055320108 Hst Same orient constraint links visits (11 12 13 14) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit8961641449080516199.xml 52 After visit 11 by 3 to 6 days. (Tic-Visit :proposal-id 14925 :visit-id "13" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:19.0" :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 1210624 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "13" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2787 :al-overhead-at-end 114 :internal-dur-at-end 1028 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3120.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds. 1490055321283 Hst Same orient constraint links visits (11 12 13 14) The scheduling data was generated by CASM 25.0. CASM was run in Phase II mode. /private/var/folders/4m/dv63fh4j63bg2wr_gy0727zc0000gn/T/OPVisit1948739717153257047.xml 53 After visit 11 by 8 to 11 days. (Tic-Visit :proposal-id 14925 :visit-id "14" :proposal-version -1 :trans-version "20170109" :date "20-Mar-2017 17:15:21.0" :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 1229024 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14925 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14925 :visit-id "14" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2845 :al-overhead-at-end 116 :internal-dur-at-end 1048 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180.0 :pcs-gap 0 ) true 1 0 0.1 s for 12th mag star yields a S/N ~ 150 Time to saturation is 3 seconds.