| Title | PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk |
| Authors | 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, Subo Prieto, J. L. Thompson, Todd A. Denneau, L. Flewelling, H. Heinze, A. N. Smartt, S. J. Smith, K. W. Stalder, B. Tonry, J. L. Weiland, H. |
| Affiliation | Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, 191 W Woodruff Ave, Columbus, OH 43210 USA Ohio State Univ, Dept Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England Post Observ, Lexington, MA 02421 USA Lawrence Berkeley Natl Lab, Phys Div, One Cyclotron Rd, Berkeley, CA 94720 USA Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, 341 Campbell Hall, Berkeley, CA 94720 USA Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland CALTECH, Div Phys Math & Astron, 1200 East Calif Blvd, Pasadena, CA 91125 USA Univ Calif Riverside, Dept Phys & Astron, 900 Univ Ave, Riverside, CA 92521 USA Univ Calif Davis, Dept Phys, 1 Shields Ave, Davis, CA 95616 USA Univ Calif Los Angeles, Dept Phys & Astron, 430 Portola Plaza, Los Angeles, CA 90095 USA Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China Univ Diego Portales, Nucleo Astron, Fac Ingn & Ciencias, Av Ejercito 441, Santiago 441, Chile Millennium Inst Astrophys, Santiago, Chile LSST, 950 North Cherry Ave, Tucson, AZ 85719 USA |
| Keywords | accretion accretion disks black hole physics galaxies: nuclei |
| Issue Date | 2019 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Abstract | We present the discovery of PS18kh, a tidal disruption event discovered at the center of SDSS J075654.53 +341543.6 (d similar or equal to 322 Mpc) 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 75 days after. The optical/UV emission from PS18kh is well-fit as a blackbody with temperatures ranging from T similar or equal to 12,000 K to T similar or equal to 25,000 K and it peaked at a luminosity of L similar or equal to 8.8 x 10(43) erg s(-1). PS18kh radiated E = (3.45 +/- 0.22) x 10(50) erg over the period of observation, with (1.42 +/- 0.20) x 10(50) erg being released during the rise to peak. Spectra of PS18kh show a changing, boxy/double-peaked Ha emission feature, which becomes more prominent over time. We use models of non-axisymmetric accretion disks to describe the profile of the Ha 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) similar to 60r(g) to an outer radius of r(out) similar to 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. |
| URI | http://hdl.handle.net/20.500.11897/546208 |
| ISSN | 0004-637X |
| DOI | 10.3847/1538-4357/ab2ae1 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 科维理天文与天体物理研究所 |
