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Title: The Long Term Evolution of ASASSN-14li

Abstract

We present late-time optical spectroscopy taken with the Large Binocular Telescope's Multi-Object Double Spectrograph, late-time Swift UVOT and X-ray Telescope observations, as well as improved All-Sky Automated Survey for SuperNovae (ASAS-SN) pre-discovery limits on the nearby (d = 90.3 Mpc, z = 0.0206) tidal disruption event (TDE) ASASSN-14li. The late-time optical spectra show Hα emission well in excess of that seen in the SDSS host galaxy spectrum, indicating that the processes powering the luminous flares associated with TDEs can operate for several hundreds of days. The Swift observations reveal the presence of lingering apparently thermal UV (TUV ~ 3.5 × 104 K) and X-ray (TX ~ 7 × 105 K) emission. The characteristic temperatures evolve by, at most, a factor of ~2 over the 600 d follow-up campaign. The X-ray, UV and Hα luminosities evolve roughly in tandem and at a rate that is consistent with a power-law decay at late times. This behaviour is in stark contrast with the majority of optically discovered TDEs, which are X-ray faint and evolve on shorter time-scales. Finally, we address how the unique properties of ASASSN-14li can be used to probe the relationship between the TDE rate and host galaxy properties.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Carnegie Observatories, Pasadena, CA (United States)
  3. Univ. Diego Portales, Santiago (Chile); Millennium Inst. of Astrophysics, Santiago (Chile)
  4. Morehead State Univ., KY (United States)
Publication Date:
Research Org.:
Krell Inst., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535670
Grant/Contract Number:  
FG02-97ER25308
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 466; Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics

Citation Formats

Brown, J. S., Holoien, T. W. -S., Auchettl, K., Stanek, K. Z., Kochanek, C. S., Shappee, B. J., Prieto, J. L., and Grupe, D. The Long Term Evolution of ASASSN-14li. United States: N. p., 2017. Web. doi:10.1093/mnras/stx033.
Brown, J. S., Holoien, T. W. -S., Auchettl, K., Stanek, K. Z., Kochanek, C. S., Shappee, B. J., Prieto, J. L., & Grupe, D. The Long Term Evolution of ASASSN-14li. United States. doi:10.1093/mnras/stx033.
Brown, J. S., Holoien, T. W. -S., Auchettl, K., Stanek, K. Z., Kochanek, C. S., Shappee, B. J., Prieto, J. L., and Grupe, D. Tue . "The Long Term Evolution of ASASSN-14li". United States. doi:10.1093/mnras/stx033. https://www.osti.gov/servlets/purl/1535670.
@article{osti_1535670,
title = {The Long Term Evolution of ASASSN-14li},
author = {Brown, J. S. and Holoien, T. W. -S. and Auchettl, K. and Stanek, K. Z. and Kochanek, C. S. and Shappee, B. J. and Prieto, J. L. and Grupe, D.},
abstractNote = {We present late-time optical spectroscopy taken with the Large Binocular Telescope's Multi-Object Double Spectrograph, late-time Swift UVOT and X-ray Telescope observations, as well as improved All-Sky Automated Survey for SuperNovae (ASAS-SN) pre-discovery limits on the nearby (d = 90.3 Mpc, z = 0.0206) tidal disruption event (TDE) ASASSN-14li. The late-time optical spectra show Hα emission well in excess of that seen in the SDSS host galaxy spectrum, indicating that the processes powering the luminous flares associated with TDEs can operate for several hundreds of days. The Swift observations reveal the presence of lingering apparently thermal UV (TUV ~ 3.5 × 104 K) and X-ray (TX ~ 7 × 105 K) emission. The characteristic temperatures evolve by, at most, a factor of ~2 over the 600 d follow-up campaign. The X-ray, UV and Hα luminosities evolve roughly in tandem and at a rate that is consistent with a power-law decay at late times. This behaviour is in stark contrast with the majority of optically discovered TDEs, which are X-ray faint and evolve on shorter time-scales. Finally, we address how the unique properties of ASASSN-14li can be used to probe the relationship between the TDE rate and host galaxy properties.},
doi = {10.1093/mnras/stx033},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 466,
place = {United States},
year = {2017},
month = {1}
}

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Works referencing / citing this record:

A tidal disruption event in the nearby ultra-luminous infrared galaxy F01004-2237
journal, March 2017


The tidal disruption event AT2017eqx: spectroscopic evolution from hydrogen rich to poor suggests an atmosphere and outflow
journal, July 2019

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  • DOI: 10.1093/mnras/stz1837