0 Assigned ID: 5780 ----- Attempting Submission 1 (Tue Mar 26 22:54:07 GMT 2024) ----- HST Phase I Proposal 5780 successfully submitted. Receipt: # 5780-1 This target is not used in this proposal. This target is not used in this proposal. This target is not used in this proposal. This is now revised to replace the 4 orbits in visits 5/6 that were affected by guide star failures (HOPR 93268). There are two visits (10 and 11) of 2 orbits each, with 3 orbits of G230L/NUV and 1 orbit of G140L/FUV. There is only a single window from July 15-18 where these can be observed. 2002154880 ----- Attempting Submission 1 (Fri Aug 16 14:30:26 GMT 2024) ----- HST Phase II Proposal 17767 successfully submitted. Receipt: # 17767-1 ----- Attempting Submission 2 (Fri May 02 19:35:11 GMT 2025) ----- HST Phase II Proposal 17767 successfully submitted. Receipt: # 17767-2 ----- Attempting Submission 3 (Fri May 02 19:46:10 GMT 2025) ----- HST Phase II Proposal 17767 successfully submitted. Receipt: # 17767-3 ----- Attempting Submission 4 (Mon Jun 09 18:24:47 GMT 2025) ----- HST Phase II Proposal 17767 successfully submitted. Receipt: # 17767-4 ----- Attempting Submission 5 (Mon Jun 23 20:43:38 GMT 2025) ----- New visits for 4 orbits to replace the failures (HOPR 93268). Unveiling TDE Accretion Disks at Late Times with UV Spectroscopy and XMM-Newton The tidal disruption of a star by a supermassive black hole produces broadband emission as the debris forms a disk and accretes. Most previous work has focused on observations near maximum light when the accretion disk may be obscured by a reprocessing layer. However, recent observations have shown that long-lived UV plateaus may be common in these events at late times as the unobscured accretion disk becomes visible. We propose the first STIS UV spectroscopic observations on these timescales combined with XMM-Newton observations to diagnose the properties of the accretion disk, the spectral shape of the ionizing continuum, and how these are reflected in the broad emission lines. These observations will open a new window of investigation into late-time multiwavelength properties of TDEs and will strengthen connections between previous work on AGN accretion and newly formed TDE accretion disks. This proposal consists of non-disruptive ToO observations (up to 30 days response time) of 3 tidal disruption events (TDEs) for 8 orbits with HST + 15ks with XMM-Newton. Each TDE trigger will be for an old object, more than 200 days after optical discovery. We anticipate that our targets will be faint and in the range of 18th-21st AB magnitude on top of a host galaxy nucleus of similar optical brightness (but much fainter in the UV). For each TDE target, we need 8 orbits of observation: 4 with STIS/FUV-MAMA and 4 with STIS/NUV-MAMA. Due to the scheduling restriction that visits should be no longer than 3 orbits, we have broken up each TDE trigger into 3 visits: Visit 1: 3 orbits with STIS/FUV-MAMA using G140L and the 52x0.2D1 aperture (following advice in STIS handbook section 4.2.3 to place point sources near the D1 position for FUV) Visit 2: 3 orbits with STIS/NUV-MAMA using G230L with the 52x0.2 aperture Visit 3: 1 orbit with STIS/FUV-MAMA and 1 orbit with STIS/FUV-MAMA to complete the observation Each visit requires an ACQ in the first orbit. As these are triggered observations, we do not yet know the exact brightness of the TDE or the host. We expect that the TDE will be a UV-bright point source on top of a (much redder) galaxy nucleus. The ACQ process uses the STIS/CCD with the F28X50LP filter, but the host galaxy may dominate in the optical. I have entered placeholder parameters for a diffuse acquisition. The exposure times and checkbox size may be adjusted depending on the actual properties of the target, so we have not provided ETC output until the actual fluxes are known. A ToO Activation on TDE1 should activate Visits 01, 02, and 03. A ToO Activation on TDE2 should activate Visits 04, 05, and 06. A ToO Activation on TDE3 should activate Visits 07, 08, and 09. R. Chornock (UC Berkeley) is an expert in the spectroscopy of TDEs and other optical transients, with approved Lick and Keck programs for optical spectroscopy of TDEs. He is the PI of a complementary accepted Swift Cycle 20 program to obtain late-time UVOT photometry and XRT observations of TDEs on the same timescales probed here. He is currently the co-chair of the ZTF TDE and Massive Black Hole Science Working Group that is the leading source of TDE discoveries in the northern sky. UC Berkeley is also a founding partner in the LS4 survey, a new southern sky time-domain survey that will start operations in 2024. R. Margutti (UC Berkeley) Former member of the Swift-XRT team and founding member of YSE and LS4, current ZTF-O4 member, expert with X-ray data acquisition and analysis. Y. Yao (UC Berkeley) is a Miller Fellow and expert on multiwavelength observations of TDEs. E. Hammerstein (Maryland) is a finishing graduate student whose Ph.D. thesis subject includes the UV and optical properties of TDEs. K. D. Alexander (Arizona) is an expert on radio emission and multiwavelength properties of TDEs. She has approved PI and co-I programs to characterize the radio properties of TDEs on timescales ranging from days to years post-disruption. Supermassive Black Holes and Active Galaxies 6 false true false false false false true PRIMARY 45 true SUPPORTED GALAXY NUCLEUS QUASAR J2000 STAR UNDESIGNATED J2000 GALAXY NUCLEUS Point source transient on top of r~18th mag host J2000 GALAXY NUCLEUS J2000 GALAXY ACCRETION DISK NUCLEUS 1) TDE > 200 days after optical discovery 2) with UV magnitude brighter than m_UV < 21 AB mag GALAXY ACCRETION DISK NUCLEUS 1) TDE > 200 days after optical discovery 2) with UV magnitude brighter than m_UV < 21 AB mag GALAXY ACCRETION DISK NUCLEUS 1) TDE > 200 days after optical discovery 2) with UV magnitude brighter than m_UV < 21 AB mag STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/NUV-MAMA Spectroscopic No No G230L 2376 /Users/chornock/work/proposals/hst-cycle32/tde/OP-cache/late-time-tde-phaseII-v01.xml The scheduling data was generated by CASM 33.1. 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