0Assigned ID: 161
----- Attempting Submission 1 (Wed Apr 05 19:20:59 GMT 2017) -----
HST Phase I Proposal 161 (leftbehind12Z.apt) successfully submitted.
Receipt: # 161-1
----- Attempting Submission 2 (Fri Apr 07 23:34:06 GMT 2017) -----0----- Attempting Submission 1 (Wed Jul 19 14:19:20 GMT 2017) -----Left Behind: A Bound Remnant from a White Dwarf Supernova?Type Ia supernovae (SN Ia) have enormous importance to cosmology and astrophysics, but their progenitors and explosion mechanisms are not understood in detail. Recently, observations and theoretical models have suggested that not all thermonuclear white-dwarf supernova explosions are normal SN Ia. In particular, type Iax supernovae (peculiar cousins to SN Ia), are thought to be exploding white dwarfs that are not completely disrupted, leaving behind a bound remnant. In deep and serendipitous HST pre-explosion data, we have discovered a luminous, blue progenitor system for the type Iax SN 2012Z in NGC 1309, which we interpret as a helium-star donor to the exploding white dwarf. HST observations of SN 2012Z in 2016, when the supernova light was expected to have faded away, still show a source at the location, as expected in our model where the pre-explosion flux was coming from the companion. However, the 2016 data also show a surprise: an excess flux compared to the progenitor system. Our proposed observations here will help unravel the mystery of that excess flux: is it from the bound ex-white dwarf remnant? Or is it from the shocked companion star that has been bombarded by supernova ejecta? Either of these possibilities would provide key new evidence as to the nature of these white dwarf supernovae.We propose to obtain late-time optical ACS/WFC BVI images at the location of SN 2012Z in NGC 1309 to look for further changes in the system.
We have constructed our proposed observations to match the ACS/WFC data from Cycle 22, which in turn corresponded to the pre-explosion images and photometry of S1 in terms of filters and depth. Our best measurement of any changes from the pre-explosion and Cycle 22 images will come from image-subtraction analysis. We will use dithering and subsampling to improve the spatial resolution of the ACS images, as we did in our previous observations.
To measure a meaningful change in the system, we will aim for S/N ~ 10 at the brightness of the progenitor S1 in the new F435W and F555W images, and S/N ~ 8 in F814W. These choices match the depth achieved in the Cycle 22 images from 2016. Based on the ACS/WFC ETC, using a 0.15 arcsec (3 pixel) aperture radius, we require 9500 sec of exposure in F435W, 13500 sec in F555W, and 14100 sec in F814W. With overheads, this requires 14 orbits.
Given the expected ~years timescale for changes in the system, we propose these data for the nominal Cycle 26 period (late 2018/early 2019, at approximately +2500 days. As a small program, we are proposing for this time now in Cycle 25, as required.Stellar Physics6falsefalsefalsefalsefalsefalsefalseSUPPORTEDEXT-STARSUPERNOVAJ2000J2000ACS/WFCImagingNoNoF435WACS/WFCImagingNoNoF555WACS/WFCImagingNoNoF814WHst Same orient constraint links visits (01 02 03 04)The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 15205
:visit-id "01"
:proposal-version -1
:trans-version "20170613"
:date "17-Jul-2017 17:50:07.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1705344
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15205
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15205
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2882
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "01"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "01"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)true30Hst Same orient constraint links visits (01 02 03 04)The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 15205
:visit-id "02"
:proposal-version -1
:trans-version "20170613"
:date "17-Jul-2017 17:49:23.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1705344
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15205
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15205
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2882
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "02"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "02"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)true30Hst Same orient constraint links visits (01 02 03 04)The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 15205
:visit-id "03"
:proposal-version -1
:trans-version "20170613"
:date "17-Jul-2017 17:49:37.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1705344
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15205
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15205
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2882
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "03"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "03"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)true30Hst Same orient constraint links visits (01 02 03 04)The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 15205
:visit-id "04"
:proposal-version -1
:trans-version "20170613"
:date "17-Jul-2017 17:49:42.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 1705344
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15205
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15205
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2882
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "04"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "04"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2994
: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 3216
:pcs-gap 0
)true30The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.1531510767000244.5(Tic-Visit
:proposal-id 15205
:visit-id "05"
:proposal-version -1
:trans-version "20170613"
:date "17-Jul-2017 17:55:34.0"
: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 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15205
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15205
:visit-id "05"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2882
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "05"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2993
: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 3216
:pcs-gap 0
)true20/private/var/folders/q_/glfmvhmj0mq4qm_yvhs134lh0003lp/T/OPVisit825658886724007954.xml(Tic-Visit
:proposal-id 15205
:visit-id "06"
:proposal-version -1
:trans-version "20180409"
:date "17-Sep-2018 09:34:15.0"
: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 1136896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15205
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15205
:visit-id "06"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2882
: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 3216
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 15205
:visit-id "06"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2993
: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 3216
:pcs-gap 0
)false20