J/ApJ/873/92ivo://CDS.VizieR/J/ApJ/873/92doi:10.26093/cds/vizier.18730092CDSBlagorodnova N.Cenko S.B.Kulkarni S.R.Arcavi I.Bloom J.S.,Duggan G.Filippenko A.V.Fremling C.Horesh A.Hosseinzadeh G.,Karamehmetoglu E.Levan A.Masci F.J.Nugent P.E.Pasham D.R.,Veilleux S.Walters R.Yan L.Zheng W.2021-03-23T12:28:49Z2020-09-02T13:54:22ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometryultraviolet-photometryspectroscopyultraviolet-astronomyWe present multiwavelength observations of the tidal disruption event (TDE) iPTF15af, discovered by the intermediate Palomar Transient Factory survey at redshift z=0.07897. The optical and ultraviolet (UV) light curves of the transient show a slow decay over 5 months, in agreement with previous optically discovered TDEs. It also has a comparable blackbody peak luminosity of L_peak_~1.5x10^44^erg/s. The inferred temperature from the optical and UV data shows a value of (3-5)x10^4^K. The transient is not detected in X-rays up to L_X_<3x10^42^erg/s within the first 5 months after discovery. The optical spectra exhibit two distinct broad emission lines in the HeII region, and at later times also H{alpha} emission. Additionally, emission from [NIII] and [OIII] is detected, likely produced by the Bowen fluorescence effect. UV spectra reveal broad emission and absorption lines associated with high-ionization states of NV, CIV, SiIV, and possibly PV. These features, analogous to those of broad absorption line quasars (BAL QSOs), require an absorber with column densities N_H_>10^23^cm^-2^. This optically thick gas would also explain the nondetection in soft X-rays. The profile of the absorption lines with the highest column density material at the largest velocity is opposite that of BAL QSOs. We suggest that radiation pressure generated by the TDE flare at early times could have provided the initial acceleration mechanism for this gas. Spectral UV line monitoring of future TDEs could test this proposal.2019ApJ...873...92Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/873/92CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)II/313 : Palomar Transient Factory (PTF) photometric catalog 1.0 (Ofek+, 2012)II/328 : AllWISE Data Release (Cutri+ 2013)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/ApJ/676/944 : GALEX & CFHTLS cand. tidal disruption events (Gezari+, 2008)J/ApJ/679/962 : Quasars with strong nitrogen emission lines (Jiang+, 2008)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/ApJ/692/758 : BAL QSOs in SDSS-DR5 (Gibson+, 2009)J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)J/ApJ/793/38 : Palomar Transient Factory photometric obs. (Arcavi+, 2014)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/ApJS/210/3 : SDSS bulge, disk & total stellar masses (Mendel+, 2014)J/ApJS/219/8 : SFR for WISE + SDSS spectroscopic galaxies (Chang+, 2015)J/A+A/593/A68 : PTF12os & iPTF13bvn spectra & light curves (Fremling+, 2016)J/MNRAS/463/3813 : ASASSN-15oi UBVI M2W1W2 light curves (Holoien+, 2016)J/MNRAS/455/2918 : Photom. & line luminosities for ASASSN-14li (Holoien+, 2016)J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)J/ApJ/844/46 : Photom. of transient event iPTF16fnl (Blagorodnova+, 2017)J/MNRAS/469/323 : SDSS quasars with PV broad absorption (Capellupo+, 2017)J/ApJ/852/72 : Luminosity functions of TDFs (van Velzen, 2018)http://wiserep.weizmann.ac.il/ : Weizmann Interactive Supernova Data Repositoryhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/873/92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/873/92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/873/92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/873/92https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/873/92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/873/92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/873/92/table2Optical difference imaging and Swift UV aperture photometry of iPTF15af in the AB magnitude systeml_UmagLimit flag on Umagmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[56664/57185.3] Modified Julian Datedtime.epochfloatPhase[-373.3/148] Days since discovery; MJD 57037.3dtime.phasefloatTelTelescope + Instrument information (1)meta.note;instrcharl_UVW1magLimit flag on UVW1magmeta.code.errorcharUVW1mag[19/20.8]? Uncorrected Swift/UVOT UVW1 band (AB) magnitudemagphot.mag;em.UVfloatnullablee_UVW1mag[0.08/0.3]? Uncertainty in UVW1magmagstat.error;phot.magfloatnullableUVM2mag[19/20.5]? Uncorrected Swift/UVOT UVM2 band (AB) magnitudemagphot.mag;em.UVfloatnullablee_UVM2mag[0.06/0.15]? Uncertainty in UVM2magmagstat.error;phot.magfloatnullableUVW2mag[18.8/20.5]? Uncorrected Swift/UVOT UVW2 band (AB) magnitudemagphot.mag;em.UVfloatnullablee_UVW2mag[0.05/0.16]? Uncertainty in UVW2magmagstat.error;phot.magfloatnullableUmag[19/20]? Uncorrected Swift/UVOT U band (AB) magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0.1/0.3]? Uncertainty in Umagmagstat.error;phot.magfloatnullablel_BmagLimit flag on Bmagmeta.code.errorcharBmag[18.4/21]? Uncorrected Swift/UVOT B band (AB) magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.15/0.8]? Uncertainty in Bmagmagstat.error;phot.magfloatnullablel_VmagLimit flag on Vmagmeta.code.errorcharVmag[17.5/21.2]? Uncorrected Swift/UVOT V band (AB) magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.15/0.6]? Uncertainty in Vmagmagstat.error;phot.magfloatnullablel_gmagLimit flag on gmagmeta.code.errorchargmag[18.4/21.1]? Uncorrected g band (AB) magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag[0.04/0.4]? Uncertainty in gmagmagstat.error;phot.magfloatnullablel_rmagLimit flag on rmagmeta.code.errorcharrmag[18.5/23.3]? Uncorrected r band (AB) magnitude (2)magphot.mag;em.opt.Rfloatnullablee_rmag[0.05/0.5]? Uncertainty in rmagmagstat.error;phot.magfloatnullablel_imagLimit flag on imagmeta.code.errorcharimag[19.8/21.1]? Uncorrected i band (AB) magnitudemagphot.mag;em.opt.Ifloatnullablee_imag[0.1/0.4]? Uncertainty in imagmagstat.error;phot.magfloatnullableJ/ApJ/873/92/table3*Log of ground-based (and HST/STIS) spectroscopic observations of iPTF15afrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhase[7/1035] Days since discovery; MJD 57037.3dtime.phaseintMJD[57044.5/58072.6] Modified Julian Date of the observationdtime.epochfloatDateUTC date of observationstime.epoch;obsnullableTelTelescope + InstrumentinstrcharPA[87/272]? Position angledegpos.posAngintnullableExp[600/2922] Exposure timestime.duration;obs.exposureintf_MJDFlag on HST+STIS observation (1)meta.codecharSpInteractive plot of spectrummeta.ref.urlchar