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

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 languageEnglish (US)
Article number120
JournalAstrophysical Journal
Volume880
Issue number2
DOIs
StatePublished - Aug 1 2019

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accretion disks
erg
accretion
perturbation
profiles
H lines
eccentricity
asteroid
asteroids
bells
supernovae
sky
luminosity
telescopes
radii
rings
temperature
rate

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Pan-Starrs, Asas-Sn, Atlas, Holoien, T. W. S., Huber, M. E., Shappee, B. J., ... Weiland, H. (2019). PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk. Astrophysical Journal, 880(2), [120]. https://doi.org/10.3847/1538-4357/ab2ae1
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. ; 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. In: Astrophysical Journal. 2019 ; Vol. 880, No. 2.
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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.",
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",
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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

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

In: Astrophysical Journal, Vol. 880, No. 2, 120, 01.08.2019.

Research output: Contribution to journalArticle

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T1 - PS18kh

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.

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Pan-Starrs, Asas-Sn, Atlas, Holoien TWS, Huber ME, Shappee BJ et al. PS18kh: A New Tidal Disruption Event with a Non-axisymmetric Accretion Disk. Astrophysical Journal. 2019 Aug 1;880(2). 120. https://doi.org/10.3847/1538-4357/ab2ae1