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TOPIC: Superluminous supernova

Blobrana

L

Posts: 131433

Date: Nov 20 04:57 2014

Superluminous Supernovae	Permalink

Title: Superluminous Supernovae Powered by Magnetars: Late-time Light Curves and Hard Emission Leakage Author: S. Q. Wang, L. J. Wang, Z. G. Dai, X. F. Wu Recently, researches performed by two groups have revealed that the magnetar spin-down energy injection model with full energy trapping can explain the early-time light curves of SN 2010gx, SN 2013dg, LSQ12dlf, SSS120810 and CSS121015, but fails to fit the late-time light curves of these Superluminous Supernovae (SLSNe). These results imply that the original magnetar-powered model is challenged in explaining these SLSNe. Our paper aims to simultaneously explain both the early- and late-time data/upper limits by considering the leakage of hard emissions. We incorporate quantitatively the leakage effect into the original magnetar-powered model and derive a new semi-analytical equation. Comparing the light curves reproduced by our revised magnetar-powered model to the observed data and/or upper limits of these five SLSNe, we found that the late-time light curves reproduced by our semi-analytical equation are in good agreement with the late-time observed data and/or upper limits of SN 2010gx, CSS121015, SN 2013dg and LSQ12dlf and the late-time excess of SSS120810, indicating that the magnetar-powered model might be responsible for these SLSNe and that the gamma ray and X-ray leakage are unavoidable when the hard photons were down-Comptonised to softer photons. To determine the details of the leakage effect and unveil the nature of SLSNe, more high quality bolometric light curves and spectra of SLSNe are required. Read more (209kb, PDF) __________________

Blobrana

L

Posts: 131433

Date: Jun 9 13:51 2011

RE: Superluminous supernova	Permalink

Brightest exploding stars spotted Scientists have identified a new type of supernova or exploding star which is ten times brighter than any other type of stellar explosion. Astrophysicist Dr Mark Sullivan of Oxford University's Department of Physics is among researchers reporting the discovery in this week's Nature. Until now scientists have been aware of two basic types of supernova - 'Type Ia supernovae', which are thermonuclear explosions of small and very dense stars called white dwarfs - and slightly fainter 'core collapse supernovae', brought about by the deaths of very massive stars (possibly with masses up to 50-100 times that of the sun). This second type of supernova was featured in the BBC's Wonders of the Universe. The new research is published by 27 academics from Oxford, Caltech, the universities of California and Toronto, the Weizmann Institute and other leading institutions. Read more __________________

Blobrana

L

Posts: 131433

Date: Jun 9 07:24 2011

Extremely bright supernovae	Permalink

A team led by Caltech astronomers has discovered a new type of supernova that may burn 100 times brighter than typical exploding stars - and they're trying to figure out exactly how this new type works. The study, which identified four newly discovered supernovae as part of this unknown class, also solves the mystery behind two previously unexplained events - one that had been thought to be an extremely luminous Type II supernova, and another whose nature had scientists completely baffled. Read more __________________

Blobrana

L

Posts: 131433

Date: Jun 8 23:52 2011

Superluminous supernova	Permalink

A rare, superluminous kind of stellar explosion does not fit into the usual supernova categories Four new Palomar Transient Factory (PTF) supernovae, along with two events identified in the past several years that defied classification, all share the same unexplained traits: They are extraordinarily bright, and a spectral breakdown of their emitted light shows no trace of common supernova components such as hydrogen, iron and calcium. The extreme brightness of the new class of supernovae, some 10 times that of a typical type Ia supernova from an exploding white dwarf, rank them among the most luminous supernovae known. That luminosity enabled Robert Quimby, a postdoctoral researcher at the California Institute of Technology, and his colleagues to spot a handful of the new supernovae among the 1,000-plus supernovae of all kinds that have been found by PTF, even though core-collapse supernovae appear to be 10,000 times more common. Read more __________________

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