J/ApJ/903/31ivo://CDS.VizieR/J/ApJ/903/31doi:10.26093/cds/vizier.19030031CDSHung T.Foley R.J.Ramirez-Ruiz E.Dai J.L.Auchettl K.,Kilpatrick C.D.Mockler B.Brown J.S.Coulter D.A.Dimitriadis G.,Holoien T.W.-S.Law-Smith J.A.P.Piro A.L.Rest A.Rojas-Bravo C.,Siebert M.R.2022-03-11T14:12:05Z2022-02-10T08:13:46ZCDS support team

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

cds-question@unistra.frsupernovaeinfrared-photometryvisible-astronomybroad-band-photometryx-ray-sourcesWe present the multiwavelength analysis of the tidal disruption event (TDE) AT2018hyz (ASASSN-18zj). From follow-up optical spectroscopy, we detect the first unambiguous case of resolved double-peaked Balmer emission in a TDE. The distinct line profile can be well-modeled by a low eccentricity (e~0.1) accretion disk extending out to ~100Rp and a Gaussian component originating from non-disk clouds, though a bipolar outflow origin cannot be completely ruled out. Our analysis indicates that in AT2018hyz, disk formation took place promptly after the most-bound debris returned to pericenter, which we estimate to be roughly tens of days before the first detection. Redistribution of angular momentum and mass transport, possibly through shocks, must occur on the observed timescale of about a month to create the large H{alpha}-emitting disk that comprises <~5% of the initial stellar mass. With these new insights from AT2018hyz, we infer that circularization is efficient in at least some, if not all optically bright, X-ray faint TDEs. In these efficiently circularized TDEs, the detection of double-peaked emission depends on the disk inclination angle and the relative strength of the disk contribution to the non-disk component, possibly explaining the diversity seen in the current sample.2020ApJ...903...31Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/903/31CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/425/1789 : Berkeley supernova Ia program. I. (Silverman+, 2012)J/ApJS/208/20 : Nine-year WMAP point source catalogs (Bennett+, 2013)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/793/38 : Palomar Transient Factory photometric obs. (Arcavi+, 2014)J/ApJ/795/44 : PS1 SNe Ia (0.02<z<0.7) griz light curves (Rest+, 2014)J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/MNRAS/455/2918 : Photometry & line luminosities ASASSN-14li (Holoien+, 2016)J/MNRAS/463/3813 : ASASSN-15oi UBVI M2W1W2 light curves (Holoien+, 2016)J/ApJ/844/46 : Photometry of transient event iPTF16fnl (Blagorodnova+, 2017)J/ApJ/872/198 : UV-Opt LC tidal disruption flare AT2018zr (van Velzen+, 2019)J/ApJ/873/92 : Opt. & UV evolution of the TDE iPTF15af (Blagorodnova+, 2019)J/ApJ/880/120 : Photometry of tidal disruption event PS18kh (Holoien+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/903/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/903/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/903/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/903/31https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/903/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/903/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-rayOpticalInfrareddefaultJ/ApJ/903/31/tablea1Swift XRT observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58432/58667] Modified Julian Date; MJD-2400000.5dtime.epochdoubleTint[782/2595] Integration timestime.epochintl_Flux[<] Limit flag on Fluxmeta.code.error;phot.fluxcharFlux[3.95/9.67] Flux in 10^-14^erg/s/cm^2^phot.fluxfloate_Flux[2.58/3.88]? Error on Fluxstat.error;phot.fluxfloatnullableJ/ApJ/903/31/tablea2Photometric data of AT 2018hyzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[58432/58675] Modified Julian Date; MJD-2400000.5dtime.epochdoublemag[15.96/19.79] Apparent magnitude in Filtermagphot.magfloate_mag[0.01/0.11] Uncertainty in magmagstat.error;phot.magfloatFiltFilter usedinstr.setup;instr.filtercharTelTelescope used (Swift or Swope)instr.setupchar