J/ApJ/844/46ivo://CDS.VizieR/J/ApJ/844/46doi:10.26093/cds/vizier.18440046CDSBlagorodnova N.Gezari S.Hung T.Kulkarni S.R.Cenko S.B.Pasham D.R.,Yan L.Arcavi I.Ben-Ami S.Bue B.D.Cantwell T.Cao Y.,Castro-Tirado A.J.Fender R.Fremling C.Gal-Yam A.Ho A.Y.Q.,Horesh A.Hosseinzadeh G.Kasliwal M.M.Kong A.K.H.Laher R.R.,Leloudas G.Lunnan R.Masci F.J.Mooley K.Neill J.D.Nugent P.,Powell M.Valeev A.F.Vreeswijk P.M.Walters R.Wozniak P.2018-05-16T07:04:41Z2018-04-05T12:43:46ZCDS support team

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

cds-question@unistra.frvisible-astronomyWide-band photometryultraviolet-photometrysloan-photometryWe present ground-based and Swift observations of iPTF16fnl, a likely tidal disruption event (TDE) discovered by the intermediate Palomar Transient Factory (iPTF) survey at 66.6Mpc. The light curve of the object peaked at an absolute mag M_g_=-17.2. The maximum bolometric luminosity (from optical and UV) was L_p_~(1.0+/-0.15)x10^43^erg/s, an order of magnitude fainter than any other optical TDE discovered so far. The luminosity in the first 60 days is consistent with an exponential decay, with L{propto}e^-(t-t_0_)/{tau}^, where t_0_=57631.0 (MJD) and {tau}~15 days. The X-ray shows a marginal detection at L_X_=2.4_-1.1_^1.9^x10^39^erg/s (Swift X-ray Telescope). No radio counterpart was detected down to 3{sigma}, providing upper limits for monochromatic radio luminosities of {nu}L_{nu}_<2.3x10^36^erg/s and {nu}L_{nu}_<1.7x10^37^erg/s (Very Large Array, 6.1 and 22GHz). The blackbody temperature, obtained from combined Swift UV and optical photometry, shows a constant value of 19000K. The transient spectrum at peak is characterized by broad HeII and H{alpha} emission lines, with FWHMs of about 14000km/s and 10000km/s, respectively. HeI lines are also detected at {lambda}{lambda}5875 and 6678. The spectrum of the host is dominated by strong Balmer absorption lines, which are consistent with a post-starburst (E+A) galaxy with an age of ~650Myr and solar metallicity. The characteristics of iPTF16fnl make it an outlier on both luminosity and decay timescales, as compared to other optically selected TDEs. The discovery of such a faint optical event suggests a higher rate of tidal disruptions, as low-luminosity events may have gone unnoticed in previous searches.2017ApJ...844...46Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/844/46CatalogResearchIsServedByTAP VizieR generic servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)II/313 : Palomar Transient Factory (PTF) catalog 1.0 (Ofek+, 2012)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/AJ/116/1094 : MAPS-PP catalog of galaxies (Cabanela+, 1998)J/ApJS/122/51 : Spectroscopy of 10 rich galaxy clusters (Dressler+ 1999)J/ApJS/170/33 : Optical properties of Markarian galaxies (Petrosian+, 2007)J/ApJ/676/944 : GALEX & CFHTLS cand. tidal disruption events (Gezari+, 2008)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/793/38 : PTF photometric observations (Arcavi+, 2014)J/A+A/593/A68 : PTF12os & iPTF13bvn spectra & light curves (Fremling+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/844/46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/844/46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/844/46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/844/46https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/844/46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/844/46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.381800341673347e-19 1.2058628298368645e-18UVOpticaldefaultJ/ApJ/844/46/table3Optical and UV photometry of iPTF16fnl in AB magnitude systeme_umag[0.07/0.3]? Uncertainty in umagmagstat.error;phot.mag;em.opt.UfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57626.4/57724.7] Modified Julian Date, JD-240000.5dtime.epochfloatTelTelescope+Instrument Used (Swift+UVOT, P48+CFH12k or P60+SEDM)instr.setupcharUVW1mag[16.8/18.9]? Swift/UVOT UVW1 passband AB magnitudemagphot.mag;em.UVfloatnullablee_UVW1mag[0.04/0.08]? Uncertainty in UVW1magmagstat.error;phot.magfloatnullableUVM2mag[16.9/19.4]? Swift/UVOT UVM2 passband AB magnitudemagphot.mag;em.UVfloatnullablee_UVM2mag[0.04/0.2]? Uncertainty in UVM2magmagstat.error;phot.magfloatnullableUVW2mag[16.6/19.5]? Swift/UVOT UVW2 passband AB magnitudemagphot.mag;em.UVfloatnullablee_UVW2mag[0.04/0.08]? Uncertainty in UVW2magmagstat.error;phot.magfloatnullableUmag[16.3/17.5]? Swift/UVOT U passband AB magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0.04/0.07]? Uncertainty in Umagmagstat.error;phot.mag;em.opt.UfloatnullableBmag[15.6/16.1]? Swift/UVOT B passband AB magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.03/0.05]? Uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableVmag[15.1/15.7]? Swift/UVOT V passband AB magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.04/0.07]? Uncertainty in Vmagmagstat.error;phot.mag;em.opt.Vfloatnullableumag[17.1/19.8]? Palomar u' passband AB magnitude in SDSS systemmagphot.mag;em.opt.Ufloatnullablegmag[17.1/20.8]? Palomar g' passband AB magnitude in SDSS system (1)magphot.mag;em.opt.Bfloatnullablee_gmag[0.06/0.4]? Uncertainty in gmagmagstat.error;phot.mag;em.opt.Bfloatnullablermag[17.3/20.9]? Palomar r' passband AB magnitude in SDSS system (1)magphot.mag;em.opt.Rfloatnullablee_rmag[0.06/0.4]? Uncertainty in rmagmagstat.error;phot.mag;em.opt.Rfloatnullableimag[17.2/19]? Palomar i' passband AB magnitude, in SDSS systemmagphot.mag;em.opt.Ifloatnullablee_imag[0.07/0.4]? Uncertainty in imagemagstat.error;phot.mag;em.opt.Ifloatnullable