0Assigned ID: 239
----- Attempting Submission 1 (Thu Apr 06 15:49:27 GMT 2017) -----This target is not used in this proposal.With possible target and resulting scheduling
No bright object issues, and schedulable
We have requested another Swift epoch to confirm UV flux and whether it is on the rise or fall in flux
Please take a look for any problems, as it seems plausible that we will trigger based on the next Swift observation-816219032----- Attempting Submission 1 (Thu Jul 20 17:21:34 GMT 2017) -----
----- Attempting Submission 2 (Thu Jul 20 18:11:04 GMT 2017) -----
HST Phase II Proposal 15312 (tde.apt) successfully submitted.
Receipt: # 15312-2
----- Attempting Submission 3 (Mon May 14 19:35:21 GMT 2018) -----target is confirmed, and will be checked again before any trigger
generic target was just left in, not actually usedUltraviolet Spectroscopic Monitoring of a Tidal Disruption EventdTidal disruption events (TDE), where supermassive black holes destroy stars to
produce accretion flares, are of great current observational and
theoretical interest. Here we propose a seven epoch STIS UV
spectroscopic "movie'' of a UV bright TDE spread over the first ~90
days after a rapid TOO trigger. The roughly 15 day cadence is comparable
to the expected and observed time scales for kinematic changes in the
optical and UV emission and absorption lines. We will measure
the evolution of UV absorption and emission lines from elements
(e.g., C, N, Si) and ionization states/potentials not seen
in optical spectra of TDEs, which should help to illuminate their
dynamical evolution. In some cases, the debris from the stellar cores
should have significantly enhanced [N/C] abundances due to the CNO
cycle, so UV spectra can provide a means of differentiating debris from
the core and the envelope of the disrupted star. Optically-selected
TDEs are energetically dominated by their UV emission, making it
the wavelength range most needed to understand these fascinating
transients.The goal is to obtain a sequence of 7 STIS FUV-MAMA/G140L and NUV-MAMA/G230L UV spectra
of a tidal disruption event, obtaining roughly one spectrum every 15 days for 90 days.
Orbits are set for 1, 2, 2, 3, 4, 5 and 5 orbits for the first through seventh observations. The
exact final sequence may need adjusting to match the evolution of the target.
First observation is a disruptive, rapid (but not ultra-rapid) 2-5 day TOO, followed by observations
chained by 13-17 days. The second observation counts as a disruptive TOO, and the
remainder are non-disruptive.
We have set the acquisiton image for a point source with the standard F28X50LP filter and a
10 second exposure time -- this is appropriate for the early phases where any ASAS-SN
bright ASAS-SN TDE should have V~16-17 mag -- should yield a SNR=79 according to the
STIS acquistion ETC -- this should still be OK if the TDE is as bright as V~15, and hold
for at least the first 1/2 of the visits. The exposure times may need to be adjusted for the
later 1/2 of the visits and may need a switch to a diffuse source as the TDE fades relative
to its host.
We have used an along slit dither to clean up hot pixels, with a step of 16 pixels to be larger
than the recommended 0.35 arcsec -- we expect features fairly broad in velocity so we have
not used dithers perpendicular to the slit. A minimum of two exposures are then taken at
each dither position. The source should be well above sky, so the 0.2x50 slit should be fine
for both the FUV and NUV observations.Massive Black Holes And Their Host Galaxies6falsetruefalsefalsefalsefalseSUPPORTEDGALAXYACCRETION DISKQUASARYESJ2000Target would also have to meet STIS/MAMA safety criteriaSwfit UV flux at 2000A above 10^(-14.5) ergs/cm^2/A/secSTIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376POS-TARGDITHER0.3829LINEfalsefalse290.0STIS-ALONG-SLIT1falsePOS-TARGDITHER0.3829LINEfalsefalse390.0STIS-ALONG-SLIT2falsePOS-TARGDITHER0.3829LINEfalsefalse590.0STIS-ALONG-SLIT3falseTiming link suitability includes constraints ([02 After 01 by 13.0 to 17.0 days])The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode./tmp/OPVisit9150418925279578437.xmlDisruptive ToO trigger of 2-5 days turnaround.(Tic-Visit
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