J/ApJ/933/196ivo://CDS.VizieR/J/ApJ/933/196doi:10.26093/cds/vizier.19330196CDSHoloien T.W.-S.Neustadt J.M.M.Vallely P.J.Auchettl K.Hinkle J.T.,Romero-Canizales C.Shappee B.J.Kochanek C.S.Stanek K.Z.Chen P.,Dong S.Prieto J.L.Thompson T.A.Brink T.G.Filippenko A.V.,Zheng W.Bersier D.Bose S.Burgasser A.J.Channa S.de Jaeger T.,Hestenes J.Im M.Jeffers B.Jun H.D.Lansbury G.Post R.S.,Ross T.W.Stern D.Tang K.Tucker M.A.Valenti S.Yunus S.,Zhang K.D.2025-02-13T20:11:31Z2024-11-26T09:03:45ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frspectroscopyultraviolet-astronomyvisible-astronomyphotometrytransient-sourcesactive-galactic-nucleisupernovaeWe present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object's evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSSJ171955.84+414049.4 on UT 2017 July 27 at a redshift of z=0.1641. The transient peaked at an absolute B-band magnitude of M_B,peak_=-22.81, corresponding to a bolometric luminosity of L_bol,peak_=8.3x10^44^erg/s, and exhibited late-time ultraviolet emission that was still ongoing in our latest observations. Integrating the full light curve gives a total emitted energy of E_tot_=(1.36+/-0.08)x10^52^erg, with (0.80+/-0.02)x10^52^erg of this emitted within 200 days of peak light. This late-time ultraviolet emission is accompanied by increasing X-ray emission that becomes softer as it brightens. ASASSN-17jz exhibited a large number of spectral emission lines most commonly seen in active galactic nuclei (AGNs) with little evidence of evolution. It also showed transient Balmer features, which became fainter and broader over time, and are still being detected >1000 days after peak brightness. We consider various physical scenarios for the origin of the transient, including supernovae (SNe), tidal disruption events, AGN outbursts, and ANTs. We find that the most likely explanation is that ASASSN-17jz was a SN IIn occurring in or near the disk of an existing AGN, and that the late-time emission is caused by the AGN transitioning to a more active state.2022ApJ...933..196Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/933/196CatalogResearchIsServedByTAP VizieR generic servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VII/23 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)II/328 : AllWISE Data Release (Cutri+ 2013)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/AJ/124/3042 : Narrow-line Sy1 galaxies from SDSS EDR (Williams+, 2002)J/ApJ/613/682 : AGN masses & broad-line region sizes (Peterson+, 2004)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)J/ApJ/793/38 : Palomar Transient Factory photometric obs. (Arcavi+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/MNRAS/455/2918 : Phot. & line luminosities for ASASSN-14li (Holoien+, 2016)J/MNRAS/463/3813 : ASASSN-15oi UBVI M2W1W2 light curves (Holoien+, 2016)J/ApJ/844/46 : Phot. of the transient event iPTF16fnl (Blagorodnova+, 2017)J/ApJS/233/17 : Swift/BAT AGN spectroscopic survey. V. X-ray (Ricci+, 2017)J/MNRAS/465/L114 : OGLE16aaa UVOT light curves (Wyrzykowski+, 2017)J/ApJ/880/120 : Phot. of the tidal disruption event PS18kh (Holoien+, 2019)J/ApJ/883/147 : LCs of the energetic H-stripped SN2016coi (Terreran+, 2019)J/ApJ/872/198 : LCs of tidal disruption flare AT2018zr (van Velzen+, 2019)J/ApJ/898/161 : 500days of ASASSN-18pg multiwavelength obs. (Holoien+, 2020)J/ApJ/903/31 : Phot. AT 2018hyz with Swift XRT, UVOT & Swope (Hung+, 2020)J/ApJ/930/12 : Phot. & sp. follow-up of ASASSN-20hx (Hinkle+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/933/196https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/933/196http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/933/196https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/933/196https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/933/196http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/933/196GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticaldefaultJ/ApJ/933/196/table3Stacked host-subtracted photometry of ASASSN-17jzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD1[57876.48/59051.2] Modified Julian date lower range (1)dtime.epochdoubleMJD2[57887.6/59052.7]? Modified Julian date upper range (1)dtime.epochdoublenullableFiltPhotometric filtermeta.id;instr.filtercharl_magThe 3-sigma upper limit flag on magmeta.code.error;phot.magcharmag[16.54/20.76] Apparent AB magnitude in Filt, corrected for Galactic extinction (2)magphot.magfloate_mag[0.01/0.6]? Uncertainty on magmagstat.error;phot.magfloatnullableJ/ApJ/933/196/fig3HST/STIS UV spectroscopic evolution of ASASSN-17jzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date (UT) (1)time.epochnullableMJD[58015.6/58061.8] Modified Julian date of observationdtime.epochdoubleindexedlambda[988/2714.3] Wavelength; Angstroms0.1nmem.wlfloatFlux[-6.8e-15/1.98e-14] Flux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.flux;em.UVdoubleJ/ApJ/933/196/tablea1Optical spectroscopic Observation logs of ASASSN-17jzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57965.9/59107.2] Modified Julian date of observationtime.epochdoubleDateYear of observation (UT)stime.epochnullableTelTelescopemeta.id;instr.telcharInstInstrument (G1)meta.id;instrcharGratingGratingmeta.id;instrcharSlit[1/2] Slitarcsecinstr.setupfloatExpExposure timestime.duration;obs.exposurecharspInteractive spectrum plotmeta.ref.urlcharJ/ApJ/933/196/fig2Optical spectroscopic evolution of ASASSN-17jzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57965.9/59107.2] Modified Julian date of observationdtime.epochdoubleindexedInstSpectroscopic instrument (G1)meta.id;instrcharDateObservation date (UT)time.epochnullablem_Date[ab] Multiple observation on Datemeta.code.multip;time;obscharlambda[2629.6/10218.5] Wavelength; Angstroms0.1nmem.wlfloatFlux[-1.2e-14/2.35e-14] Flux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.flux;em.optdouble