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Title: PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk

Abstract

We present the discovery of PS18kh, a tidal disruption event discovered at the center of SDSS J075654.53+341543.6 (d ≃ 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 ≃ 12,000 K to T ≃ 25,000 K and it peaked at a luminosity of L ≃ 8.8 × 1043 erg s-1. PS18kh radiated E = (3.45 ± 0.22) × 1050 erg over the period of observation, with (1.42 ± 0.20) × 1050 erg being released during the rise to peak. Spectra of PS18kh show a changing, boxy/double-peaked Hα emission feature, which becomes more prominent over time. We use models of non-axisymmetric accretion disks to describe the profile of the Hα 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 itmore » 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.« less

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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
Pan-STARRS; ASAS-SN; ATLAS Collaboration
OSTI Identifier:
1561939
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 880; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

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., and Weiland, H. PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab2ae1.
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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. PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk. United States. https://doi.org/10.3847/1538-4357/ab2ae1
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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., and Weiland, H. Thu . "PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk". United States. https://doi.org/10.3847/1538-4357/ab2ae1. https://www.osti.gov/servlets/purl/1561939.
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@article{osti_1561939,
title = {PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk},
author = {Holoien, T. W. -S. and Huber, M. E. and Shappee, B. J. and Eracleous, M. and Auchettl, K. and Brown, J. S. and Tucker, M. A. and Chambers, K. C. and Kochanek, C. S. and Stanek, K. Z. and Rest, A. and Bersier, D. and Post, R. S. and Aldering, G. and Ponder, K. A. and Simon, J. D. and Kankare, E. and Dong, D. and Hallinan, G. and Reddy, N. A. and Sanders, R. L. and Topping, M. W. and Bulger, J. and Lowe, T. B. and Magnier, E. A. and Schultz, A. S. B. and Waters, C. Z. and Willman, M. and Wright, D. and Young, D. R. and Dong, Subo and Prieto, J. L. and Thompson, Todd A. and Denneau, L. and Flewelling, H. and Heinze, A. N. and Smartt, S. J. and Smith, K. W. and Stalder, B. and Tonry, J. L. and Weiland, H.},
abstractNote = {We present the discovery of PS18kh, a tidal disruption event discovered at the center of SDSS J075654.53+341543.6 (d ≃ 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 ≃ 12,000 K to T ≃ 25,000 K and it peaked at a luminosity of L ≃ 8.8 × 1043 erg s-1. PS18kh radiated E = (3.45 ± 0.22) × 1050 erg over the period of observation, with (1.42 ± 0.20) × 1050 erg being released during the rise to peak. Spectra of PS18kh show a changing, boxy/double-peaked Hα emission feature, which becomes more prominent over time. We use models of non-axisymmetric accretion disks to describe the profile of the Hα 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.},
doi = {10.3847/1538-4357/ab2ae1},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 880,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 2019},
month = {Thu Aug 01 00:00:00 EDT 2019}
}
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Figures / Tables:

Table 1 Table 1: Archival Photometry of SDSS J075654.53+341543.6
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Cold gas stripping in satellite galaxies: from pairs to clusters
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A Luminous, fast Rising Uv-Transient Discovered by Rotse: a Tidal Disruption Event?
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Disc formation from tidal disruptions of stars on eccentric orbits by Schwarzschild black holes
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Disk Formation Versus disk Accretion—What Powers Tidal Disruption Events?
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An ultraviolet–optical flare from the tidal disruption of a helium-rich stellar core
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Hello darkness my old friend: the fading of the nearby TDE ASASSN-14ae
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ASASSN-14ae: a tidal disruption event at 200 Mpc
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The unusual late-time evolution of the tidal disruption event ASASSN-15oi
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The Intermediate-Line Region in Active Galactic Nuclei
journal, October 2016

A Comparison of the X-Ray Emission from Tidal Disruption Events with those of Active Galactic Nuclei
journal, January 2018

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PS1-10jh CONTINUES TO FOLLOW THE FALLBACK ACCRETION RATE OF A TIDALLY DISRUPTED STAR
journal, December 2015

New Physical Insights about Tidal Disruption Events from a Comprehensive Observational Inventory at X-Ray Wavelengths
journal, April 2017

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The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl
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Elliptical accretion disks in active galactic nuclei
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MUSE REVEALS A RECENT MERGER IN THE POST-STARBURST HOST GALAXY OF THE TDE ASASSN-14li
journal, October 2016

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journal, January 2016

ATLAS: A High-cadence All-sky Survey System
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A large accretion disc of extreme eccentricity in the TDE ASASSN-14li
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The superluminous transient ASASSN-15lh as a tidal disruption event from a Kerr black hole
text, January 2016

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  • Apollo - University of Cambridge Repository
  • DOI: 10.17863/cam.8873

Optical Flares from the Tidal Disruption of Stars by Massive Black Holes
journal, August 2009

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  • Proceedings of the International Astronomical Union, Vol. 5, Issue S267
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Pan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational-wave source GW150914
text, January 2016

  • Smartt, Sj; Chambers, Kc; Smith, Kw
  • Apollo - University of Cambridge Repository
  • DOI: 10.17863/cam.1274

The seventh data release of the sloan digital sky survey
text, January 2009

  • Abazajian, K. N.; Al, Et; Adelman-McCarthy, J. K.
  • Institute of Physics Publishing
  • DOI: 10.5167/uzh-30878

Contribution of a Disk Component to Single Peaked Broad Lines of Active Galactic Nuclei
text, January 2009

The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
text, January 2010

A Description of Quasar Variability Measured Using Repeated SDSS and POSS Imaging
text, January 2011

Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties
text, January 2012

Las Cumbres Observatory Global Telescope Network
text, January 2013

A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
text, January 2014

General Relativistic Hydrodynamic Simulation of Accretion Flow from a Stellar Tidal Disruption
text, January 2015

Disc formation from tidal disruptions of stars on eccentric orbits by Schwarzschild black holes
text, January 2015

A Dark Year for Tidal Disruption Events
text, January 2015

Machine learning for transient discovery in Pan-STARRS1 difference imaging
text, January 2015

Insights into Tidal Disruption of Stars from PS1-10jh
text, January 2015

On the nature of Hydrogen-rich Superluminous Supernovae
text, January 2016

Hello Darkness My Old Friend: The Fading of the Nearby TDE ASASSN-14ae
text, January 2016

The TDE ASASSN-14li and its host resolved at parsec scales with the EVN
text, January 2016

iPTF16fnl: a faint and fast tidal disruption event in an E+A galaxy
text, January 2017

Revisiting optical tidal disruption events with iPTF16axa
text, January 2017

The Ultraviolet Spectroscopic Evolution of the Low-Luminosity Tidal Disruption Event iPTF16fnl
text, January 2017

BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
text, January 2017

Weighing Black Holes using Tidal Disruption Events
text, January 2018

The Unusual Late-Time Evolution of the Tidal Disruption Event ASASSN-15oi
text, January 2018

Stellar population synthesis at the resolution of 2003
text, January 2003

The Swift Ultra-Violet/Optical Telescope
text, January 2005

The Swift X-ray Telescope
text, January 2005

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    Works referencing / citing this record:

    Evidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate AT 2018fyk
    journal, July 2019

    • Wevers, T.; Pasham, D. R.; van Velzen, S.
    • Monthly Notices of the Royal Astronomical Society, Vol. 488, Issue 4
    • DOI: 10.1093/mnras/stz1976

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    journal, December 2019

    • Lu, Wenbin; Bonnerot, Clément
    • Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 1
    • DOI: 10.1093/mnras/stz3405

    Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS
    journal, September 2019

    • Holoien, Thomas W. -S.; Vallely, Patrick J.; Auchettl, Katie
    • The Astrophysical Journal, Vol. 883, Issue 2
    • DOI: 10.3847/1538-4357/ab3c66

    The Spectral Evolution of AT 2018dyb and the Presence of Metal Lines in Tidal Disruption Events
    journal, December 2019

    • Leloudas, Giorgos; Dai, Lixin; Arcavi, Iair
    • The Astrophysical Journal, Vol. 887, Issue 2
    • DOI: 10.3847/1538-4357/ab5792

    The ASAS-SN catalogue of variable stars – V. Variables in the Southern hemisphere
    journal, September 2019

    • Jayasinghe, T.; Stanek, K. Z.; Kochanek, C. S.
    • Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 1
    • DOI: 10.1093/mnras/stz2711

    An Unusual Mid-infrared Flare in a Type 2 AGN: An Obscured Turning-on AGN or Tidal Disruption Event?
    journal, November 2019

    The ASAS-SN Catalog of Variable Stars V: Variables in the Southern Hemisphere
    text, January 2019

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