SAINTS: Images of SN 1987ASN 1987A is the great supernova of the HST era. It is the only case
where we have detailed knowledge of the pre-existing structure in the
circumstellar gas. It is the only case where we can observe the
details of a transition from supernova to supernova remnant. An
unbroken string of observations is the essential tool for detecting
change and establishing a uniform legacy archive. As we have
demonstrated, images reveal a wide variety of processes at work-- most
notably the change in the energetics of the debris from radioactive
power in the first 5000 days to X-ray illumination from the outside at
the present day. We also observed the explosive eruption of
"hotspots" around the circumstellar ring and are now using their time
history to infer their structure. We have devised a way to image the
reverse shock at both Lyman alpha and H-alpha that will help solve a
riddle in the excitation of these lines and illuminate the
hydrodynamics of the site where non-thermal processes are at work. We
propose this novel UV work for the current cycle. The HST
observations have a unique blend of photometric fidelity and angular
resolution that also makes them the indispensable partner to ongoing
X-ray, radio, and far-IR observations. ALMA provides a new way to
study dust formation and the kinematics of the explosion by comparison
to HST images. This HST program is a long term study: for a 25 year
old remnant, we believe brief and simple annual sampling is adequate,
but an ongoing commitment is essential.The proposed imaging program of SN 1987A will provide continuing information on the
luminosity and expansion of the debris, eruption and evolution of hotspots, and photoionization
of the surrounding gas, all at the highest available spatial resolution.
Summary of the proposed observations:
Cycle 21: 1 orbit with F435W, F625W, 2 orbits with F657N, F502N, 4 orbits with F656N,
F645N, F665N and F658N, and 3 orbits with ACS/SBC/F122M = total 10 orbits
Cycle 22: 1 orbit with F435W, F625W = total 1 orbit
Cycle 23: 1 orbit with F435W, F625W, 2 orbits with F657N, F502N = total 3 orbits
Observations using WFC3/UVIS with filters F435W, F625W, F657N, F502N will connect
with our earlier observations at similar signal-to-noise ratio (S/N) through drizzled
observations.ISM AND CIRCUMSTELLAR MATTER0falsefalsefalsefalsefalsefalseSUPPORTEDEXT-STARSUPERNOVAThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000J2000WFC3/UVISImagingNoNoF438WWFC3/UVISImagingNoNoF625WWFC3/UVISImagingNoNoF657NWFC3/UVISImagingNoNoF502NACS/SBCImagingNoNoF122MWFC3/UVISImagingNoNoF645NWFC3/UVISImagingNoNoF656NWFC3/UVISImagingNoNoF658NWFC3/UVISImagingNoNoF665NPOS-TARGDITHER0.173LINE0.112falsefalse81.785423.884WFC3-UVIS-DITHER-BOX1falseThe scheduling data was generated by CASM 23.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14333
:visit-id "01"
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:trans-version "20150609"
:date "22-Jul-2015 14:07:47.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 91536
:tdrss-contact-duration 0
:coron NIL
)
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(Tic-Orbit
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 3148
:al-overhead-at-end 45
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3556
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(Tic-Orbit
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:visit-id "01"
:orbit-number 2
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:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
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(Tic-Orbit
:proposal-id 14333
:visit-id "01"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3331
:al-overhead-at-end 45
:internal-dur-at-end 137
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3556
:pcs-gap 0
)false30