The current Call for Proposals is for HST Cycle 34. HST Phase I submission for joint JWST-HST program JWST program ID is 11245 -584671422 Assigned ID: 6947 ----- Attempting Submission 1 (Thu Mar 19 00:34:01 GMT 2026) ----- The instructions email asks to enter cycle 33 for this 0 ----- Attempting Submission 1 (Thu Apr 30 01:52:27 GMT 2026) ----- Tidal disruption events (TDEs) are luminous flares produced when a star is torn apart and accreted by a massive black hole (MBH). More than 100 TDEs have been discovered so far, almost all originating from galactic nuclei where MBHs typically reside. However, galaxy-merger simulations predict a substantial population of wandering MBHs outside galactic centers--yet no TDE had ever been associated with one until now. The discovery of AT 2024tvd, the first confirmed off-nuclear TDE, opens an entirely new window on this phenomenon. Its location, offset from the bright stellar background of the galactic nucleus, offers a uniquely clean view of accretion physics in action and a chance to test the long-standing idea that TDEs arise from stars bound in nuclear star clusters (NSCs). We propose coordinated multiwavelength observations with JWST (infrared; NIRSpec IFU + NIRCam), HST (UV + optical imaging), and XMM-Newton (X-ray) to obtain a late-time (>700 days after optical peak) spectral energy distribution (SED) spanning X-ray to infrared wavelengths. The SED will be modeled with three components--the accretion disk, an NSC, and a dust echo--to constrain the MBH mass, accretion rate, and disk size. The NSC component will directly test the presence of a bound stellar cluster and measure its mass, age, and metallicity, testing whether the wandering MBH was delivered through a past galaxy merger. The dust component will characterize the temperature and luminosity of the surrounding dust. These observations will provide unique insights into the progression of accretion in TDEs, in addition to the demographics and growth pathways of wandering MBHs. One orbit will be used for ACS/SBC imaging in F140LP and F165LP (for red-leak correction). Two orbits for WFC3 imaging in F225W, F336W, F621M, and F775W. This team has performed extensive observational and theoretical work in the area of black hole and stellar astrophysics, especially TDEs, AGN physics, and supernovae. PI Dr. Kishore Patra is an expert observer who has extensive experience in time-domain astronomy. He has lead several HST/JWST programs as a PI and has authored several papers on supernovae, TDEs and related nuclear transient events. He will lead the data analysis and timely publication of results. CoI Prof. Ryan Foley is an expert observer and previous PI/CoI of multiple HST and JWST programs. He is a coauthor on several TDE papers. CoIs Prof. Ashley Villar, Prof. Sebastian Gomez, and Prof. Decker French are experts on theory and multi-wavelength observations of extragalactic transients, including TDEs, core-collapse supernovae, and kilonovae. They are also experts in X-ray, UV, optical and IR astronomy. CoIs Dr. Kirsty Taggart and Dr. Prasiddha Arunachalam are postdocs and expert observers with extensive experience with transients and JWST data. They have also led successful JWST and HST programs. CoIs Dr. Phillip Macias and Prof. Enrico Ramirez-Ruiz are theoretical astrophysicists focusing on high-energy phenomena. CoI Dr. Samaporn Tinyanont is an expert on infrared astronomy. CoIs Kyle Davis, Ravjit Kaur, and Nicholas Earl are graduate students. They are observers with expertise in multi-wavelength, time-domain astronomy. All CoIs will assist PI Patra with data analysis and timely publication of results. Supermassive Black Holes and Active Galaxies Stellar Populations and the Interstellar Medium 6 false false false false false false false true SECONDARY JWST 11245 false SUPPORTED UNIDENTIFIED ACCRETION DISK INFRARED EMITTER OPTICAL EMITTER ULTRAVIOLET EMITTER X-RAY EMITTER J2000 J2000 ACS/SBC Imaging No No F140LP ACS/SBC Imaging No No F165LP WFC3/UVIS Imaging No No F225W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F621M WFC3/UVIS Imaging No No F775W POS-TARG DITHER 0.179 LINE 0.116 false false 63.65 4 20.02 ACS-SBC-DITHER-BOX 1 false POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 2 false 1777501351508 Timing link suitability includes constraints ([Group (01 02) Within 30.0 days]) The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. Far-UV observation of 2024tvd (Tic-Visit :proposal-id 18237 :visit-id "01" :proposal-version -1 :trans-version "20250929" :date "29-Apr-2026 15:22:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "28" :si-bright-earth-limb-angle 20.0 :data-volume 148112 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18237 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18237 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2597 :al-overhead-at-end 0 :internal-dur-at-end 198 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) false 1 0 1777502610276 Timing link suitability includes constraints ([Group (01 02) Within 30.0 days]) The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. Near-UV and optical observations of 2024tvd (Tic-Visit :proposal-id 18237 :visit-id "02" :proposal-version -1 :trans-version "20250929" :date "29-Apr-2026 15:43:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 213904 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18237 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18237 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2601 :al-overhead-at-end 81 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18237 :visit-id "02" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2601 :al-overhead-at-end 81 :internal-dur-at-end 270 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) false 2 0