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Title: Six months of multiwavelength follow-up of the tidal disruption candidate ASASSN-14li and implied TDE rates from ASAS-SN

In this paper, we present ground-based and Swift photometric and spectroscopic observations of the candidate tidal disruption event (TDE) ASASSN-14li, found at the centre of PGC 043234 (d ≃ 90 Mpc) by the All-Sky Automated Survey for SuperNovae (ASAS-SN). The source had a peak bolometric luminosity of L ≃ 1044 erg s-1 and a total integrated energy of E ≃ 7 × 1050 erg radiated over the ~6 months of observations presented. The UV/optical emission of the source is well fitted by a blackbody with roughly constant temperature of T ~ 35 000 K, while the luminosity declines by roughly a factor of 16 over this time. The optical/UV luminosity decline is broadly consistent with an exponential decline, L∝e-t/t0, with t0 ≃ 60 d. ASASSN-14li also exhibits soft X-ray emission comparable in luminosity to the optical and UV emission but declining at a slower rate, and the X-ray emission now dominates. Spectra of the source show broad Balmer and helium lines in emission as well as strong blue continuum emission at all epochs. Finally, we use the discoveries of ASASSN-14li and ASASSN-14ae to estimate the TDE rate implied by ASAS-SN, finding an average rate of r ≃ 4.1 × 10-5more » yr-1 per galaxy with a 90 per cent confidence interval of (2.2–17.0) × 10-5 yr-1 per galaxy. ASAS-SN found roughly 1 TDE for every 70 Type Ia supernovae in 2014, a rate that is much higher than that of other surveys.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [11] ;  [3] ;  [3] ;  [3] ;  [3] ;  [12] ;  [6] more »;  [12] ;  [1] ;  [13] ;  [14] ;  [15] « less
  1. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy. Center for Cosmology and AstroParticle Physics (CCAPP)
  2. Diego Portales Univ., Santiago (Chile). Dept. of Astronomy; Millennium Inst. of Astrophysics, Santiago (Chile)
  3. Peking Univ., Beijing (China). Kavli Inst. for Astronomy and Astrophysics
  4. Carnegie Observatories, Pasadena, CA (United States)
  5. Morehead State Univ., Morehead, KY (United States). Dept. of Earth and Space Science
  6. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy
  7. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy; Grove City High School, OH (United States)
  8. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy. Center for Cosmology and AstroParticle Physics (CCAPP). Dept. of Physics
  9. Liverpool John Moores Univ. (United Kingdom). Astrophysics Research Inst.
  10. Coral Towers Observatory, Cairns, QLD (Australia)
  11. Whipple Observatory, Amado, AZ (United States)
  12. Warsaw Univ. Astronomical Observatory (Poland)
  13. Dartmouth College, Hanover, NH (United States). Dept. of Physics and Astronomy
  14. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy; Univ. of Arizona, Tucson, AZ (United States). LBT Observatory
  15. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
1329874
Report Number(s):
LA-UR--15-24845
Journal ID: ISSN 0035-8711
Grant/Contract Number:
AC52-06NA25396; FG02-97ER25308
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 455; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
Diego Portales Univ., Santiago (Chile); Peking Univ., Beijing (China); Morehead State Univ., Morehead, KY (United States); Liverpool John Moores Univ. (United Kingdom); Dartmouth College, Hanover, NH (United States)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS astronomy and astrophysics; accretion; accretion discs; black hole physics; galaxies; nuclei