J/ApJ/880/120ivo://CDS.VizieR/J/ApJ/880/120doi:10.26093/cds/vizier.18800120CDSHoloien T.W.-S.Huber M.E.Shappee B.J.Eracleous M.Auchettl K.,Brown J.S.Tucker M.A.Chambers K.C.Kochanek C.S.Stanek K.Z.Rest A.,Bersier D.Post R.S.Aldering G.Ponder K.A.Simon J.D.Kankare E.,Dong D.Hallinan G.Reddy N.A.Sanders R.L.Topping M.W.Bulger J.,Lowe T.B.Magnier E.A.Schultz A.S.B.Waters C.Z.Willman M.Wright D.,Young D.R.Dong S.Prieto J.L.Thompson T.A.Denneau L.Flewelling H.,Heinze A.N.Smartt S.J.Smith K.W.Stalder B.Tonry J.L.Weiland H.2021-04-07T12:56:17Z2021-02-01T07:23:55ZCDS support team

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

cds-question@unistra.frultraviolet-photometryinfrared-photometryvisible-astronomyWide-band photometryWe present the discovery of PS18kh, a tidal disruption event discovered at the center of SDSS J075654.53+341543.6 (d~322Mpc) by the Pan-STARRS Survey for Transients. Our data set includes pre-discovery survey data from Pan-STARRS, the All-sky Automated Survey for Supernovae, and the Asteroid Terrestrial-impact Last Alert System as well as high-cadence, multiwavelength follow-up data from ground-based telescopes and Swift, spanning from 56 days before peak light until 75days after. The optical/UV emission from PS18kh is well-fit as a blackbody with temperatures ranging from T~12000K to T~25000K and it peaked at a luminosity of L~8.8x10^43^erg/s. PS18kh radiated E=(3.45+/-0.22)x10^50^erg over the period of observation, with (1.42+/-0.20)x10^50^erg being released during the rise to peak. Spectra of PS18kh show a changing, boxy/double-peaked H{alpha} emission feature, which becomes more prominent over time. We use models of non-axisymmetric accretion disks to describe the profile of the H{alpha} line and its evolution. We find that at early times the high accretion rate leads the disk to emit a wind which modifies the shape of the line profile and makes it bell-shaped. At late times, the wind becomes optically thin, allowing the non-axisymmetric perturbations to show up in the line profile. The line-emitting portion of the disk extends from r_in_~60r_g_ to an outer radius of r_out_~1400r_g_ and the perturbations can be represented either as an eccentricity in the outer rings of the disk or as a spiral arm in the inner disk.2019ApJ...880..120Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/880/120CatalogResearchIsServedByTAP VizieR generic servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)VI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)J/A+A/451/457 : X-ray properties of AGN in CDFS (Tozzi+, 2006)J/ApJ/676/944 : GALEX & CFHTLS cand. tidal disruption events (Gezari+, 2008)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/ApJ/793/38 : Palomar Transient Factory photometric obs. (Arcavi+, 2014)J/A+A/562/A34 : UV FeII template from LBQS 2113-4538 (Hryniewicz+, 2014)J/MNRAS/437/656 : SN PS1-11ap light curves (McCrum+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/448/1206 : Superluminous supernovae in faint galaxies (McCrum+, 2015)J/MNRAS/463/3813 : ASASSN-15oi UBVI M2W1W2 light curves (Holoien+, 2016)J/MNRAS/455/2918 : Phot. & line luminosities for ASASSN-14li (Holoien+, 2016)J/ApJ/844/46 : Phot. of the transient event iPTF16fnl (Blagorodnova+, 2017)J/ApJS/232/8 : 16yrs of X-ray spectral analyses from 7Ms CDF-S (Liu+, 2017)J/ApJS/233/17 : Swift/BAT AGN spectroscopic survey. V. X-ray (Ricci+, 2017)J/AJ/156/241 : A first cat. of var. stars measured by ATLAS (Heinze+, 2018)J/ApJ/852/72 : Luminosities of tidal disruption flares (van Velzen, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/880/120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/880/120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/880/120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/880/120https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/880/120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/880/120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/880/120/table3Host-subtracted photometry of PS18khrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsMJD[58137.13/58277.15] Modified Julian Date (1)dtime.epochdoubleeMJD[58147.19/58261.31]? End of Modified Julian Date range (1)dtime.epochdoublenullableFiltPhotometric Filtermeta.notecharl_OmagThe 3-sigma upper limit flag on Omagmeta.code.errorcharOmag[17.1/21] Observed magnitude in Filter (2)magphot.magfloate_Omag[0.02/0.9]? Uncertainty in Omagmagstat.error;phot.magfloatnullableTelTelescope or Observatory used (3)meta.id;instr.telchar