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A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies

A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies
A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies
We present the results of a Palomar Transient Factory (PTF) archival search for blue transients that lie in the magnitude range between "normal" core-collapse and superluminous supernovae (i.e., with –21 ≤ M R(peak) ≤ –19). Of the six events found after excluding all interacting Type IIn and Ia-CSM supernovae, three (PTF09ge, 09axc, and 09djl) are coincident with the centers of their hosts, one (10iam) is offset from the center, and a precise offset cannot be determined for two (10nuj and 11glr). All the central events have similar rise times to the He-rich tidal disruption candidate PS1-10jh, and the event with the best-sampled light curve also has similar colors and power-law decay. Spectroscopically, PTF09ge is He-rich, while PTF09axc and 09djl display broad hydrogen features around peak magnitude. All three central events are in low star formation hosts, two of which are E+A galaxies. Our spectrum of the host of PS1-10jh displays similar properties. PTF10iam, the one offset event, is different photometrically and spectroscopically from the central events, and its host displays a higher star formation rate. Finding no obvious evidence for ongoing galactic nuclei activity or recent star formation, we conclude that the three central transients likely arise from the tidal disruption of a star by a supermassive black hole. We compare the spectra of these events to tidal disruption candidates from the literature and find that all of these objects can be unified on a continuous scale of spectral properties. The accumulated evidence of this expanded sample strongly supports a tidal disruption origin for this class of nuclear transients.
2041-8205
1-16
Arcavi, Iair
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Gal-Yam, Avishay
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Sullivan, Mark
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Pan, Yen-Chen
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Cenko, S. Bradley
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Horesh, Assaf
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Ofek, Eran O.
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De Cia, Annalisa
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Yan, Lin
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Yang, Chen-Wei
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Howell, D.A.
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Tal, David
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Kulkarni, Shrinivas R.
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Tendulkar, Shriharsh P.
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Tang, Sumin
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Xu, Dong
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Sternberg, Assaf
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Cohen, Judith G.
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Bloom, Joshua S.
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Nugent, Peter E.
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Kasliwal, Mansi M.
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Perley, Daniel A.
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Quimby, Robert M.
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Miller, Adam A.
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Theissen, Christopher A.
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Laher, Russ R.
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Arcavi, Iair
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Gal-Yam, Avishay
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Sullivan, Mark
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Pan, Yen-Chen
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Cenko, S. Bradley
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Horesh, Assaf
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Ofek, Eran O.
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De Cia, Annalisa
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Yan, Lin
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Yang, Chen-Wei
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Howell, D.A.
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Tal, David
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Kulkarni, Shrinivas R.
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Tendulkar, Shriharsh P.
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Tang, Sumin
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Xu, Dong
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Sternberg, Assaf
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Cohen, Judith G.
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Bloom, Joshua S.
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Nugent, Peter E.
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Kasliwal, Mansi M.
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Perley, Daniel A.
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Quimby, Robert M.
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Miller, Adam A.
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Theissen, Christopher A.
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Laher, Russ R.
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Arcavi, Iair, Gal-Yam, Avishay, Sullivan, Mark, Pan, Yen-Chen, Cenko, S. Bradley, Horesh, Assaf, Ofek, Eran O., De Cia, Annalisa, Yan, Lin, Yang, Chen-Wei, Howell, D.A., Tal, David, Kulkarni, Shrinivas R., Tendulkar, Shriharsh P., Tang, Sumin, Xu, Dong, Sternberg, Assaf, Cohen, Judith G., Bloom, Joshua S., Nugent, Peter E., Kasliwal, Mansi M., Perley, Daniel A., Quimby, Robert M., Miller, Adam A., Theissen, Christopher A. and Laher, Russ R. (2014) A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies. The Astrophysical Journal Letters, 793 (38), 1-16. (doi:10.1088/0004-637X/793/1/38).

Record type: Article

Abstract

We present the results of a Palomar Transient Factory (PTF) archival search for blue transients that lie in the magnitude range between "normal" core-collapse and superluminous supernovae (i.e., with –21 ≤ M R(peak) ≤ –19). Of the six events found after excluding all interacting Type IIn and Ia-CSM supernovae, three (PTF09ge, 09axc, and 09djl) are coincident with the centers of their hosts, one (10iam) is offset from the center, and a precise offset cannot be determined for two (10nuj and 11glr). All the central events have similar rise times to the He-rich tidal disruption candidate PS1-10jh, and the event with the best-sampled light curve also has similar colors and power-law decay. Spectroscopically, PTF09ge is He-rich, while PTF09axc and 09djl display broad hydrogen features around peak magnitude. All three central events are in low star formation hosts, two of which are E+A galaxies. Our spectrum of the host of PS1-10jh displays similar properties. PTF10iam, the one offset event, is different photometrically and spectroscopically from the central events, and its host displays a higher star formation rate. Finding no obvious evidence for ongoing galactic nuclei activity or recent star formation, we conclude that the three central transients likely arise from the tidal disruption of a star by a supermassive black hole. We compare the spectra of these events to tidal disruption candidates from the literature and find that all of these objects can be unified on a continuous scale of spectral properties. The accumulated evidence of this expanded sample strongly supports a tidal disruption origin for this class of nuclear transients.

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Accepted/In Press date: 25 July 2014
Published date: 3 September 2014
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 394578
URI: https://eprints.soton.ac.uk/id/eprint/394578
ISSN: 2041-8205
PURE UUID: 0ef4fa19-e9c0-4ec2-a925-a9f40f1cf841
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 20 May 2016 13:34
Last modified: 10 Jul 2018 00:30

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Contributors

Author: Iair Arcavi
Author: Avishay Gal-Yam
Author: Mark Sullivan ORCID iD
Author: Yen-Chen Pan
Author: S. Bradley Cenko
Author: Assaf Horesh
Author: Eran O. Ofek
Author: Annalisa De Cia
Author: Lin Yan
Author: Chen-Wei Yang
Author: D.A. Howell
Author: David Tal
Author: Shrinivas R. Kulkarni
Author: Shriharsh P. Tendulkar
Author: Sumin Tang
Author: Dong Xu
Author: Assaf Sternberg
Author: Judith G. Cohen
Author: Joshua S. Bloom
Author: Peter E. Nugent
Author: Mansi M. Kasliwal
Author: Daniel A. Perley
Author: Robert M. Quimby
Author: Adam A. Miller
Author: Christopher A. Theissen
Author: Russ R. Laher

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