Photometry of the tidal disruption event PS18kh

DOI

We 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.

Identifier
DOI http://doi.org/10.26093/cds/vizier.18800120
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/880/120
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/880/120
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/880/120
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/880/120
Provenance
Creator Holoien 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.
Publisher CDS
Publication Year 2021
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Natural Sciences; Observational Astronomy; Physics