0 Assigned ID: 1069 ----- Attempting Submission 1 (Fri Apr 07 23:03:06 GMT 2017) ----- resubmission of Phase 2 of 15496, continuation of program 15162 1180361562 ----- Attempting Submission 1 (Wed Jul 19 19:31:14 GMT 2017) ----- HST Phase II Proposal 15162 (SLSNe_HST_phase2.apt) successfully submitted. Receipt: # 15162-1 ----- Attempting Submission 2 (Fri Sep 08 20:53:47 GMT 2017) ----- ----- Attempting Submission 3 (Fri Aug 10 14:36:12 GMT 2018) ----- ----- Attempting Submission 4 (Fri Dec 07 20:22:27 GMT 2018) ----- Constraining the Late-Time Light Curve Behavior of Three Diverse Superluminous Supernovae The current generation of untargeted optical time-domain surveys have led to the discovery of rare and extreme transients such as superluminous supernovae (SLSNe). The mechanism that powers the hydrogen-poor Type I SLSNe remains elusive, though models such as a magnetar central engine and interaction with a hydrogen-poor circumstellar medium are both major contenders. One of the most promising observational methods available to test these models is to track the light curve evolution to very late times where model predictions diverge. We propose to obtain ACS/WFC imaging of three Type I SLSNe (PS16aqv, PS16fgt, and Gaia16apd) at greater than 500 rest-frame days after peak brightness when only HST provides the required sensitivity. These events span the diversity of decline timescales and colors exhibited by Type I SLSNe and will allow us to compare the late-time evolution of a diverse sample of events among themselves and with model predictions. These HST observation will be the latest ever of Type I SLSNe and will help to address important questions regarding their power source and diversity. In Cycle 25 we will use 6 orbits to observe three superluminous supernovae (PS16aqv, PS16fgt, and Gaia16apd) using ACS/WFC. We will obtain 2 orbits for each object, separated by at least a few months, to measure the late-time lightcurve decline rate. In Cycle 26 we will obtain 3 additional orbits (1 orbit per object) to measure the host galaxy flux. Stellar Physics 6 false false false false false false false SUPPORTED STAR SUPERNOVA J2000 J2000 STAR SUPERNOVA J2000 J2000 STAR SUPERNOVA J2000 J2000 ACS/WFC Imaging No No F775W ACS/WFC Imaging No No F625W ACS/WFC Imaging No No F625W POS-TARG DITHER 0.262 LINE 0.192 false false 68.14 4 18.39 ACS-WFC-DITHER-BOX 1 false The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. /Users/peterblanchard/Desktop/OP-cache/HST15496_phase2_newDec2018-v01.xml Template for PS16aqv (Tic-Visit :proposal-id 15496 :visit-id "01" :proposal-version -1 :trans-version "20181130" :date "07-Dec-2018 14:52:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15496 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15496 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2814 :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 3149 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. /Users/peterblanchard/Desktop/OP-cache/HST15496_phase2_newDec2018-v02.xml Template for PS16fgt (Tic-Visit :proposal-id 15496 :visit-id "02" :proposal-version -1 :trans-version "20181130" :date "07-Dec-2018 14:53:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15496 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15496 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2822 :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 3156 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. /Users/peterblanchard/Desktop/OP-cache/HST15496_phase2_newDec2018-v03.xml Template for Gaia16apd (Tic-Visit :proposal-id 15496 :visit-id "03" :proposal-version -1 :trans-version "20181130" :date "07-Dec-2018 14:50:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15496 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15496 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2874 :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 3238 :pcs-gap 0 ) true 1 0