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

Pan-Starrs; Asas-Sn; Atlas; T. W.S. Holoien; M. E. Huber; B. J. Shappee; M. Eracleous; K. Auchettl; J. S. Brown; M. A. Tucker; K. C. Chambers; C. S. Kochanek; K. Z. Stanek; A. Rest; D. Bersier; R. S. Post; G. Aldering; K. A. Ponder; J. D. Simon; E. Kankare; D. Dong; G. Hallinan; N. A. Reddy; R. L. Sanders; M. W. Topping; J. Bulger; T. B. Lowe; E. A. Magnier; A. S.B. Schultz; C. Z. Waters; M. Willman; D. Wright; D. R. Young; Subo Dong; J. L. Prieto; Todd A. Thompson; L. Denneau; H. Flewelling; A. N. Heinze; S. J. Smartt; K. W. Smith; B. Stalder; J. L. Tonry; H. Weiland

doi:10.3847/1538-4357/ab2ae1

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

Pan-Starrs, Asas-Sn, Atlas, T. W.S. Holoien, M. E. Huber, B. J. Shappee, M. Eracleous, K. Auchettl, J. S. Brown, M. A. Tucker, K. C. Chambers, C. S. Kochanek, K. Z. Stanek, A. Rest, D. Bersier, R. S. Post, G. Aldering, K. A. Ponder, J. D. Simon, E. KankareD. Dong, G. Hallinan, N. A. Reddy, R. L. Sanders, M. W. Topping, J. Bulger, T. B. Lowe, E. A. Magnier, A. S.B. Schultz, C. Z. Waters, M. Willman, D. Wright, D. R. Young, Subo Dong, J. L. Prieto, Todd A. Thompson, L. Denneau, H. Flewelling, A. N. Heinze, S. J. Smartt, K. W. Smith, B. Stalder, J. L. Tonry, H. Weiland

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

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 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.

Original language	English (US)
Article number	120
Journal	Astrophysical Journal
Volume	880
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ab2ae1
State	Published - Aug 1 2019

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© 2019. The American Astronomical Society. All rights reserved..

Keywords

accretion, accretion disks
black hole physics
galaxies: nuclei

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10.3847/1538-4357/ab2ae1

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Pan-Starrs, Asas-Sn, Atlas, 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., ... Weiland, H. (2019). PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk. Astrophysical Journal, 880(2), Article 120. https://doi.org/10.3847/1538-4357/ab2ae1

Pan-Starrs, Asas-Sn, Atlas, Holoien, TWS, Huber, ME, Shappee, BJ, Eracleous, M, Auchettl, K, Brown, JS, Tucker, MA, Chambers, KC, Kochanek, CS, Stanek, KZ, Rest, A, Bersier, D, Post, RS, Aldering, G, Ponder, KA, Simon, JD, Kankare, E, Dong, D, Hallinan, G, Reddy, NA, Sanders, RL, Topping, MW, Bulger, J, Lowe, TB, Magnier, EA, Schultz, ASB, Waters, CZ, Willman, M, Wright, D, Young, DR, Dong, S, Prieto, JL, Thompson, TA, Denneau, L, Flewelling, H, Heinze, AN, Smartt, SJ, Smith, KW, Stalder, B, Tonry, JL & Weiland, H 2019, 'PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk', Astrophysical Journal, vol. 880, no. 2, 120. https://doi.org/10.3847/1538-4357/ab2ae1

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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 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.",

keywords = "accretion, accretion disks, black hole physics, galaxies: nuclei",

author = "Pan-Starrs and Asas-Sn and Atlas and Holoien, {T. W.S.} and Huber, {M. E.} and Shappee, {B. J.} and M. Eracleous and K. Auchettl and Brown, {J. S.} and Tucker, {M. A.} and Chambers, {K. C.} and Kochanek, {C. S.} and Stanek, {K. Z.} and A. Rest and D. Bersier and Post, {R. S.} and G. Aldering and Ponder, {K. A.} and Simon, {J. D.} and E. Kankare and D. Dong and G. Hallinan and Reddy, {N. A.} and Sanders, {R. L.} and Topping, {M. W.} and J. Bulger and Lowe, {T. B.} and Magnier, {E. A.} and Schultz, {A. S.B.} and Waters, {C. Z.} and M. Willman and D. Wright and Young, {D. R.} and Subo Dong and Prieto, {J. L.} and Thompson, {Todd A.} and L. Denneau and H. Flewelling and Heinze, {A. N.} and Smartt, {S. J.} and Smith, {K. W.} and B. Stalder and Tonry, {J. L.} and H. Weiland",

year = "2019",

month = aug,

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doi = "10.3847/1538-4357/ab2ae1",

language = "English (US)",

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T2 - A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk

AU - Pan-Starrs,

AU - Asas-Sn,

AU - Atlas,

AU - Holoien, T. W.S.

AU - Huber, M. E.

AU - Shappee, B. J.

AU - Eracleous, M.

AU - Auchettl, K.

AU - Brown, J. S.

AU - Tucker, M. A.

AU - Chambers, K. C.

AU - Kochanek, C. S.

AU - Stanek, K. Z.

AU - Rest, A.

AU - Bersier, D.

AU - Post, R. S.

AU - Aldering, G.

AU - Ponder, K. A.

AU - Simon, J. D.

AU - Kankare, E.

AU - Dong, D.

AU - Hallinan, G.

AU - Reddy, N. A.

AU - Sanders, R. L.

AU - Topping, M. W.

AU - Bulger, J.

AU - Lowe, T. B.

AU - Magnier, E. A.

AU - Schultz, A. S.B.

AU - Waters, C. Z.

AU - Willman, M.

AU - Wright, D.

AU - Young, D. R.

AU - Dong, Subo

AU - Prieto, J. L.

AU - Thompson, Todd A.

AU - Denneau, L.

AU - Flewelling, H.

AU - Heinze, A. N.

AU - Smartt, S. J.

AU - Smith, K. W.

AU - Stalder, B.

AU - Tonry, J. L.

AU - Weiland, H.

PY - 2019/8/1

Y1 - 2019/8/1

N2 - 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.

AB - 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.

KW - accretion, accretion disks

KW - black hole physics

KW - galaxies: nuclei

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DO - 10.3847/1538-4357/ab2ae1

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JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

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

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