Hi,
the new visits using WFPC2 are visits 33 and 34.
----- Submission 1 (Tue May 09 21:30:26 GMT 2006) -----
----- Attempting Submission 2 (Fri Mar 30 19:58:07 GMT 2007) -----
Assigned ID: 170
----- Submission 1 (Fri Jan 27 00:58:47 GMT 2006) -----
Phase I Proposal 170 (saints) successfully submitted.
----- Submission 2 (Fri Jan 27 19:53:02 GMT 2006) -----
Phase I Proposal 170 (saints) successfully submitted.
SAINTS - Supernova 1987A INTensive Survey
SAINTS is a program to observe SN 1987A, the brightest supernova in 383 years, as it morphs into the youngest supernova remnant at age 19. HST is a unique tool for spatially-resolved observations of the many physical components of SN 1987A. A violent encounter is now underway between the fastest-moving debris and the circumstellar ring: the collision excites "hotspots" that light up suddenly. The optical, infrared and X-ray fluxes are rising rapidly and vary significantly on 6-month time scales: regularly-spaced HST, SPITZER, and CHANDRA observations are needed to understand the physics of these shocked regions. In Cycle 15, the many separate hotspots may begin to fuse as the shock fully enters the circumstellar ring. Photons from these shocks may excite previously invisible gas outside the ring, revealing the true extent of the mass loss that preceded the explosion of Sanduleak -69 202. The inner debris of the explosion itself, still excited by radioactive isotopes produced in the explosion, is now resolved by ACS and seen to be aspherical, providing direct evidence on the asymmetry of the explosion.
Many questions about SN 1987A remain unanswered despite our diligent efforts at observation and analysis since the launch of HST. How did the enigmatic three rings form? Precisely what took place in the core during the core collapse and bounce? Is a black hole or a neutron star left behind in the debris? The rich and deep data set from SAINTS will be a resource for current use and for future reference to help answer these central questions of supernova science.
Our ACS/HRC imaging program provides continuing information on the debris
luminosity and expansion, eruption of new hotspots, and recombination of the rings,
all at the highest available spatial resolution. Observations in a basic set of filters
(F250W, F330W, F435W, F555W, F625W, F814W, F658N, F660N, and F502N) will connect with
our earlier observations at similar signal-to-noise ratio ($S/N$).
We have good knowledge of the exposure times needed to obtain these data. Based on our experience
in Cycle 14, with 7 orbits we obtain $S/N \approx 5$--20 in the debris and 5--100 in the hotspots.
In
previous cycles, we were able to take advantage of the CVZ and use fewer orbits to
obtain the observations. In Cycle 15, with the 2-gyro
mode and possible shorter orbits, we are requesting a time allocation that is adequate to match th
e data from
previous cycles. Since the ACS/HRC G800L grism spectra described below will
pose some complications in extracting the emission-line strengths of some
lines, we would like to use narrow-band images through both F658N and F660N to
help extract the strengths of H$\alpha$ and [N~II] individually. We request 4 additional orbits to
obtain a deep H-$\alpha$ image
to make a sensitive search for brightening of as-yet unseen structures connected to the ring. We e
xpect that the rapidly increasing X-ray and EUV flux will photoionize any gas in the vicinity and
reveal its presence. The reconnaissance for
eruption of new hotspots should be done again late in Cycle 15, which takes 3
additional orbits.
The ACS/HRC/G800L grism observations require 3 orbits per visit and are
effective in providing spatially-resolved spectra of the individual hot
spots in the 5500--9800 \AA spectral range. Each orbit will consist of a
set of dithered exposures with different roll orientations to help
remove the complex background; we have had some preliminary success so
far (See Figure 4). A second visit after a six-month delay will provide a
180-degree-reversed orientation that will remove most of the
spatial-spectral confusion. These Cycle 15 grism spectra will provide a
direct comparison to the Cycle 14 data and our earlier STIS G750L
spectra, in order to monitor the rapidly changing line fluxes in
individual hot spots.NICMOS observations for Cycle 15 would include F110W, F160W, F205W, F108N,
F164N, F187N, and F212N, requiring 5 orbits and will yield a $S/N \approx of 5$-20 in the
debris and 20-100 in the hotspots. Observations in these filters were carried out in
Cycles 7, 8 and 14. Those observations will be used as templates to measure changes in the
emission of the debris and the ring from 7 years ago. They will also provide the best
limits on emission from a compact remnant in the debris.
ISM AND CIRCUMSTELLAR MATTER
12
false
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false
false
false
false
false
false
SUPPORTED
EXT-STAR
SUPERNOVA TYPE II
J2000
05 35 28.1100
-69 16 10.85
J2000
EXT-STAR
B6-B9.5 V-IV
J2000
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J2000
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J2000
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J2000
ACS/HRC
Imaging
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No
F250W
ACS/HRC
Imaging
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F330W
ACS/HRC
Imaging
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F435W
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Imaging
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F555W
ACS/HRC
Imaging
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F625W
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Imaging
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ACS/HRC
Imaging
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No
F814W
ACS/HRC
Imaging
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Imaging
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ACS/HRC
Imaging
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F658N
NIC1
Imaging
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F110W
NIC1
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F160W
NIC2
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F205W
NIC1
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No
F187N
NIC1
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NIC2
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No
F212N
ACS/HRC
Imaging
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No
F435W
ACS/HRC
Imaging
No
No
F555W
ACS/HRC
Imaging
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No
F625W
ACS/HRC
Imaging
No
No
F658N
ACS/HRC
Spectroscopic
No
No
G800L
ACS/HRC
Spectroscopic
No
No
G800L
POS-TARG
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LINE
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POS-TARG
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NIC-XSTRIP-DITH
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POS-TARG
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143.130096
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WFPC2-BOX
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POS-TARG
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:si-vis-utilization 2814
:al-overhead-at-end 0
:internal-dur-at-end 199
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
false
4
0
/tmp/OPVisit5888.xml
please try to schedule at orient 170
(Tic-Visit
:proposal-id 10867
:visit-id "33"
:proposal-version -1
:trans-version "20061210"
:date "29-Mar-2007 21:32:39.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "26"
:si-bright-earth-limb-angle 20.0
:data-volume 537792
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10867
:visit-id "33"
:obset-id "33"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10867
:visit-id "33"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2840
:al-overhead-at-end 160
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 10867
:visit-id "33"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2840
:al-overhead-at-end 160
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 10867
:visit-id "33"
:orbit-number 3
:pcs-time 355
:si-vis-utilization 2820
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
true
3
0
/tmp/OPVisit5882.xml
/tmp/OPVisit5889.xml
please try to schedule at orient 170
(Tic-Visit
:proposal-id 10867
:visit-id "34"
:proposal-version -1
:trans-version "20061210"
:date "29-Mar-2007 21:32:44.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "26"
:si-bright-earth-limb-angle 20.0
:data-volume 537792
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 10867
:visit-id "34"
:obset-id "34"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 10867
:visit-id "34"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2840
:al-overhead-at-end 160
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 10867
:visit-id "34"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2840
:al-overhead-at-end 160
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 10867
:visit-id "34"
:orbit-number 3
:pcs-time 355
:si-vis-utilization 2820
:al-overhead-at-end 180
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3281
:pcs-gap 0
)
true
3
0
/tmp/OPVisit5884.xml