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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 × 10 43 erg s -1. PS18kh radiated E = (3.45 ± 0.22) × 10 50 erg over the period of observation, with (1.42 ± 0.20) × 10 50 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 linemore » 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.« 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) (SC-25)
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.
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. doi:10.3847/1538-4357/ab2ae1.
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. doi:10.3847/1538-4357/ab2ae1.
@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 = {2019},
month = {8}
}

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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
journal, November 2015

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Disk Formation Versus disk Accretion—What Powers Tidal Disruption Events?
journal, June 2015


An ultraviolet–optical flare from the tidal disruption of a helium-rich stellar core
journal, May 2012


Hello darkness my old friend: the fading of the nearby TDE ASASSN-14ae
journal, August 2016

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PTF10iya: a short-lived, luminous flare from the nuclear region of a star-forming galaxy: PTF10iya: a short-lived, luminous flare
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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
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A Comparison of the X-Ray Emission from Tidal Disruption Events with those of Active Galactic Nuclei
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PS1-10jh CONTINUES TO FOLLOW THE FALLBACK ACCRETION RATE OF A TIDALLY DISRUPTED STAR
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New Physical Insights about Tidal Disruption Events from a Comprehensive Observational Inventory at X-Ray Wavelengths
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The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl
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MUSE REVEALS A RECENT MERGER IN THE POST-STARBURST HOST GALAXY OF THE TDE ASASSN-14li
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ASASSN-15lh: A highly super-luminous supernova
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A large accretion disc of extreme eccentricity in the TDE ASASSN-14li
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The Wide-Field Infrared Survey Explorer (Wise): Mission Description and Initial On-Orbit Performance
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Tidal disruption of stars by black holes of 106–108 solar masses in nearby galaxies
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