EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH

E. Chatzopoulos, J. C. Wheeler, J. Vinkó, A. P. Nagy, B. K. Wiggins, W. P. Even

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The recent discovery of the unprecedentedly super-luminous transient ASASSN-15lh (or SN 2015L) with its UV-bright secondary peak challenges all the power-input models that have been proposed for super-luminous supernovae. Here we examine some of the few viable interpretations of ASASSN-15lh in the context of a stellar explosion, involving combinations of one or more power inputs. We model the light curve of ASASSN-15lh with a hybrid model that includes contributions from magnetar spin-down energy and hydrogen-poor circumstellar interaction. We also investigate models of pure circumstellar interaction with a massive hydrogen-deficient shell and discuss the lack of interaction features in the observed spectra. We find that, as a supernova, ASASSN-15lh can be best modeled by the energetic core-collapse of an ∼40 M o star interacting with a hydrogen-poor shell of ∼20 M o. The circumstellar shell and progenitor mass are consistent with a rapidly rotating pulsational pair-instability supernova progenitor as required for strong interaction following the final supernova explosion. Additional energy injection by a magnetar with an initial period of 1-2 ms and magnetic field of 0.1-1 1014 G may supply the excess luminosity required to overcome the deficit in single-component models, but this requires more fine-tuning and extreme parameters for the magnetar, as well as the assumption of efficient conversion of magnetar energy into radiation. We thus favor a single-input model where the reverse shock formed in a strong SN ejecta-circumstellar matter interaction following a very powerful core-collapse SN explosion can supply the luminosity needed to reproduce the late-time UV-bright plateau.

Original languageEnglish
Article number94
JournalAstrophysical Journal
Volume828
Issue number2
DOIs
Publication statusPublished - Sep 10 2016

Fingerprint

magnetars
supernovae
explosions
explosion
hydrogen
shell
luminosity
interactions
stellar envelopes
energy
ejecta
light curve
plateaus
energetics
shock
tuning
plateau
injection
magnetic field
stars

Keywords

  • circumstellar matter
  • stars: evolution
  • stars: mass-loss
  • stars: massive
  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chatzopoulos, E., Wheeler, J. C., Vinkó, J., Nagy, A. P., Wiggins, B. K., & Even, W. P. (2016). EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH. Astrophysical Journal, 828(2), [94]. https://doi.org/10.3847/0004-637X/828/2/94

EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH. / Chatzopoulos, E.; Wheeler, J. C.; Vinkó, J.; Nagy, A. P.; Wiggins, B. K.; Even, W. P.

In: Astrophysical Journal, Vol. 828, No. 2, 94, 10.09.2016.

Research output: Contribution to journalArticle

Chatzopoulos, E, Wheeler, JC, Vinkó, J, Nagy, AP, Wiggins, BK & Even, WP 2016, 'EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH', Astrophysical Journal, vol. 828, no. 2, 94. https://doi.org/10.3847/0004-637X/828/2/94
Chatzopoulos, E. ; Wheeler, J. C. ; Vinkó, J. ; Nagy, A. P. ; Wiggins, B. K. ; Even, W. P. / EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH. In: Astrophysical Journal. 2016 ; Vol. 828, No. 2.
@article{459ae57542244152884b7321c0b3f9e6,
title = "EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH",
abstract = "The recent discovery of the unprecedentedly super-luminous transient ASASSN-15lh (or SN 2015L) with its UV-bright secondary peak challenges all the power-input models that have been proposed for super-luminous supernovae. Here we examine some of the few viable interpretations of ASASSN-15lh in the context of a stellar explosion, involving combinations of one or more power inputs. We model the light curve of ASASSN-15lh with a hybrid model that includes contributions from magnetar spin-down energy and hydrogen-poor circumstellar interaction. We also investigate models of pure circumstellar interaction with a massive hydrogen-deficient shell and discuss the lack of interaction features in the observed spectra. We find that, as a supernova, ASASSN-15lh can be best modeled by the energetic core-collapse of an ∼40 M o star interacting with a hydrogen-poor shell of ∼20 M o. The circumstellar shell and progenitor mass are consistent with a rapidly rotating pulsational pair-instability supernova progenitor as required for strong interaction following the final supernova explosion. Additional energy injection by a magnetar with an initial period of 1-2 ms and magnetic field of 0.1-1 1014 G may supply the excess luminosity required to overcome the deficit in single-component models, but this requires more fine-tuning and extreme parameters for the magnetar, as well as the assumption of efficient conversion of magnetar energy into radiation. We thus favor a single-input model where the reverse shock formed in a strong SN ejecta-circumstellar matter interaction following a very powerful core-collapse SN explosion can supply the luminosity needed to reproduce the late-time UV-bright plateau.",
keywords = "circumstellar matter, stars: evolution, stars: mass-loss, stars: massive, supernovae: general",
author = "E. Chatzopoulos and Wheeler, {J. C.} and J. Vink{\'o} and Nagy, {A. P.} and Wiggins, {B. K.} and Even, {W. P.}",
year = "2016",
month = "9",
day = "10",
doi = "10.3847/0004-637X/828/2/94",
language = "English",
volume = "828",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - EXTREME SUPERNOVA MODELS for the SUPER-LUMINOUS TRANSIENT ASASSN-15LH

AU - Chatzopoulos, E.

AU - Wheeler, J. C.

AU - Vinkó, J.

AU - Nagy, A. P.

AU - Wiggins, B. K.

AU - Even, W. P.

PY - 2016/9/10

Y1 - 2016/9/10

N2 - The recent discovery of the unprecedentedly super-luminous transient ASASSN-15lh (or SN 2015L) with its UV-bright secondary peak challenges all the power-input models that have been proposed for super-luminous supernovae. Here we examine some of the few viable interpretations of ASASSN-15lh in the context of a stellar explosion, involving combinations of one or more power inputs. We model the light curve of ASASSN-15lh with a hybrid model that includes contributions from magnetar spin-down energy and hydrogen-poor circumstellar interaction. We also investigate models of pure circumstellar interaction with a massive hydrogen-deficient shell and discuss the lack of interaction features in the observed spectra. We find that, as a supernova, ASASSN-15lh can be best modeled by the energetic core-collapse of an ∼40 M o star interacting with a hydrogen-poor shell of ∼20 M o. The circumstellar shell and progenitor mass are consistent with a rapidly rotating pulsational pair-instability supernova progenitor as required for strong interaction following the final supernova explosion. Additional energy injection by a magnetar with an initial period of 1-2 ms and magnetic field of 0.1-1 1014 G may supply the excess luminosity required to overcome the deficit in single-component models, but this requires more fine-tuning and extreme parameters for the magnetar, as well as the assumption of efficient conversion of magnetar energy into radiation. We thus favor a single-input model where the reverse shock formed in a strong SN ejecta-circumstellar matter interaction following a very powerful core-collapse SN explosion can supply the luminosity needed to reproduce the late-time UV-bright plateau.

AB - The recent discovery of the unprecedentedly super-luminous transient ASASSN-15lh (or SN 2015L) with its UV-bright secondary peak challenges all the power-input models that have been proposed for super-luminous supernovae. Here we examine some of the few viable interpretations of ASASSN-15lh in the context of a stellar explosion, involving combinations of one or more power inputs. We model the light curve of ASASSN-15lh with a hybrid model that includes contributions from magnetar spin-down energy and hydrogen-poor circumstellar interaction. We also investigate models of pure circumstellar interaction with a massive hydrogen-deficient shell and discuss the lack of interaction features in the observed spectra. We find that, as a supernova, ASASSN-15lh can be best modeled by the energetic core-collapse of an ∼40 M o star interacting with a hydrogen-poor shell of ∼20 M o. The circumstellar shell and progenitor mass are consistent with a rapidly rotating pulsational pair-instability supernova progenitor as required for strong interaction following the final supernova explosion. Additional energy injection by a magnetar with an initial period of 1-2 ms and magnetic field of 0.1-1 1014 G may supply the excess luminosity required to overcome the deficit in single-component models, but this requires more fine-tuning and extreme parameters for the magnetar, as well as the assumption of efficient conversion of magnetar energy into radiation. We thus favor a single-input model where the reverse shock formed in a strong SN ejecta-circumstellar matter interaction following a very powerful core-collapse SN explosion can supply the luminosity needed to reproduce the late-time UV-bright plateau.

KW - circumstellar matter

KW - stars: evolution

KW - stars: mass-loss

KW - stars: massive

KW - supernovae: general

UR - http://www.scopus.com/inward/record.url?scp=84991628084&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84991628084&partnerID=8YFLogxK

U2 - 10.3847/0004-637X/828/2/94

DO - 10.3847/0004-637X/828/2/94

M3 - Article

AN - SCOPUS:84991628084

VL - 828

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 94

ER -