A luminous, fast rising UV-transient discovered by rotse: A tidal disruption event?

J. Vinkó, F. Yuan, R. M. Quimby, J. C. Wheeler, E. Ramirez-Ruiz, J. Guillochon, E. Chatzopoulos, G. H. Marion, C. Akerlof

Research output: Article

50 Citations (Scopus)

Abstract

We present follow-up observations of an optical transient (OT) discovered by ROTSE on 2009 January 21. Photometric monitoring was carried out with ROTSE-IIIb in the optical and Swift in the UV up to +70 days after discovery. The light curve showed a fast rise time of ∼10 days followed by a steep decline over the next 60 days, which was much faster than that implied by 56Ni-56Co radioactive decay. The Sloan Digital Sky Survey Data Release 10 database contains a faint, red object at the position of the OT, which appears slightly extended. This and other lines of evidence suggest that the OT is of extragalactic origin, and this faint object is likely the host galaxy. A sequence of optical spectra obtained with the 9.2 m Hobby-Eberly Telescope between +8 and +45 days after discovery revealed a hot, blue continuum with no visible spectral features. A few weak features that appeared after +30 days probably originated from the underlying host. Fitting synthetic templates to the observed spectrum of the host galaxy revealed a redshift of z = 0.19. At this redshift, the peak magnitude of the OT is close to -22.5, similar to the brightest super-luminous supernovae; however, the lack of identifiable spectral features makes the massive stellar death hypothesis less likely. A more plausible explanation appears to be the tidal disruption of a Sun-like star by the central supermassive black hole. We argue that this transient likely belongs to a class of super-Eddington tidal disruption events.

Original languageEnglish
Article number12
JournalAstrophysical Journal
Volume798
Issue number1
DOIs
Publication statusPublished - jan. 1 2015

Fingerprint

galaxies
faint objects
radioactive decay
death
light curve
supernovae
optical spectrum
sun
templates
telescopes
continuums
stars
monitoring

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Vinkó, J., Yuan, F., Quimby, R. M., Wheeler, J. C., Ramirez-Ruiz, E., Guillochon, J., ... Akerlof, C. (2015). A luminous, fast rising UV-transient discovered by rotse: A tidal disruption event? Astrophysical Journal, 798(1), [12]. https://doi.org/10.1088/0004-637X/798/1/12

A luminous, fast rising UV-transient discovered by rotse : A tidal disruption event? / Vinkó, J.; Yuan, F.; Quimby, R. M.; Wheeler, J. C.; Ramirez-Ruiz, E.; Guillochon, J.; Chatzopoulos, E.; Marion, G. H.; Akerlof, C.

In: Astrophysical Journal, Vol. 798, No. 1, 12, 01.01.2015.

Research output: Article

Vinkó, J, Yuan, F, Quimby, RM, Wheeler, JC, Ramirez-Ruiz, E, Guillochon, J, Chatzopoulos, E, Marion, GH & Akerlof, C 2015, 'A luminous, fast rising UV-transient discovered by rotse: A tidal disruption event?', Astrophysical Journal, vol. 798, no. 1, 12. https://doi.org/10.1088/0004-637X/798/1/12
Vinkó, J. ; Yuan, F. ; Quimby, R. M. ; Wheeler, J. C. ; Ramirez-Ruiz, E. ; Guillochon, J. ; Chatzopoulos, E. ; Marion, G. H. ; Akerlof, C. / A luminous, fast rising UV-transient discovered by rotse : A tidal disruption event?. In: Astrophysical Journal. 2015 ; Vol. 798, No. 1.
@article{b86ece6a9f0a46a6b6188f656c0e3030,
title = "A luminous, fast rising UV-transient discovered by rotse: A tidal disruption event?",
abstract = "We present follow-up observations of an optical transient (OT) discovered by ROTSE on 2009 January 21. Photometric monitoring was carried out with ROTSE-IIIb in the optical and Swift in the UV up to +70 days after discovery. The light curve showed a fast rise time of ∼10 days followed by a steep decline over the next 60 days, which was much faster than that implied by 56Ni-56Co radioactive decay. The Sloan Digital Sky Survey Data Release 10 database contains a faint, red object at the position of the OT, which appears slightly extended. This and other lines of evidence suggest that the OT is of extragalactic origin, and this faint object is likely the host galaxy. A sequence of optical spectra obtained with the 9.2 m Hobby-Eberly Telescope between +8 and +45 days after discovery revealed a hot, blue continuum with no visible spectral features. A few weak features that appeared after +30 days probably originated from the underlying host. Fitting synthetic templates to the observed spectrum of the host galaxy revealed a redshift of z = 0.19. At this redshift, the peak magnitude of the OT is close to -22.5, similar to the brightest super-luminous supernovae; however, the lack of identifiable spectral features makes the massive stellar death hypothesis less likely. A more plausible explanation appears to be the tidal disruption of a Sun-like star by the central supermassive black hole. We argue that this transient likely belongs to a class of super-Eddington tidal disruption events.",
keywords = "Circumstellar matter, Radiation mechanisms: Non-thermal, Stars: Black holes, Stars: Magnetars, Supernovae: General",
author = "J. Vink{\'o} and F. Yuan and Quimby, {R. M.} and Wheeler, {J. C.} and E. Ramirez-Ruiz and J. Guillochon and E. Chatzopoulos and Marion, {G. H.} and C. Akerlof",
year = "2015",
month = "1",
day = "1",
doi = "10.1088/0004-637X/798/1/12",
language = "English",
volume = "798",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - A luminous, fast rising UV-transient discovered by rotse

T2 - A tidal disruption event?

AU - Vinkó, J.

AU - Yuan, F.

AU - Quimby, R. M.

AU - Wheeler, J. C.

AU - Ramirez-Ruiz, E.

AU - Guillochon, J.

AU - Chatzopoulos, E.

AU - Marion, G. H.

AU - Akerlof, C.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We present follow-up observations of an optical transient (OT) discovered by ROTSE on 2009 January 21. Photometric monitoring was carried out with ROTSE-IIIb in the optical and Swift in the UV up to +70 days after discovery. The light curve showed a fast rise time of ∼10 days followed by a steep decline over the next 60 days, which was much faster than that implied by 56Ni-56Co radioactive decay. The Sloan Digital Sky Survey Data Release 10 database contains a faint, red object at the position of the OT, which appears slightly extended. This and other lines of evidence suggest that the OT is of extragalactic origin, and this faint object is likely the host galaxy. A sequence of optical spectra obtained with the 9.2 m Hobby-Eberly Telescope between +8 and +45 days after discovery revealed a hot, blue continuum with no visible spectral features. A few weak features that appeared after +30 days probably originated from the underlying host. Fitting synthetic templates to the observed spectrum of the host galaxy revealed a redshift of z = 0.19. At this redshift, the peak magnitude of the OT is close to -22.5, similar to the brightest super-luminous supernovae; however, the lack of identifiable spectral features makes the massive stellar death hypothesis less likely. A more plausible explanation appears to be the tidal disruption of a Sun-like star by the central supermassive black hole. We argue that this transient likely belongs to a class of super-Eddington tidal disruption events.

AB - We present follow-up observations of an optical transient (OT) discovered by ROTSE on 2009 January 21. Photometric monitoring was carried out with ROTSE-IIIb in the optical and Swift in the UV up to +70 days after discovery. The light curve showed a fast rise time of ∼10 days followed by a steep decline over the next 60 days, which was much faster than that implied by 56Ni-56Co radioactive decay. The Sloan Digital Sky Survey Data Release 10 database contains a faint, red object at the position of the OT, which appears slightly extended. This and other lines of evidence suggest that the OT is of extragalactic origin, and this faint object is likely the host galaxy. A sequence of optical spectra obtained with the 9.2 m Hobby-Eberly Telescope between +8 and +45 days after discovery revealed a hot, blue continuum with no visible spectral features. A few weak features that appeared after +30 days probably originated from the underlying host. Fitting synthetic templates to the observed spectrum of the host galaxy revealed a redshift of z = 0.19. At this redshift, the peak magnitude of the OT is close to -22.5, similar to the brightest super-luminous supernovae; however, the lack of identifiable spectral features makes the massive stellar death hypothesis less likely. A more plausible explanation appears to be the tidal disruption of a Sun-like star by the central supermassive black hole. We argue that this transient likely belongs to a class of super-Eddington tidal disruption events.

KW - Circumstellar matter

KW - Radiation mechanisms: Non-thermal

KW - Stars: Black holes

KW - Stars: Magnetars

KW - Supernovae: General

UR - http://www.scopus.com/inward/record.url?scp=84919765237&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84919765237&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/798/1/12

DO - 10.1088/0004-637X/798/1/12

M3 - Article

AN - SCOPUS:84919765237

VL - 798

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 12

ER -