Gamma-Ray Bursts and magnetar-forming Supernovae

Ken'ichi Nomoto, Keiichi Maeda, Masaomi Tanaka, Tomoharu Suzuki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The connection between long Gamma Ray Bursts (GRBs) and Supernovae (SNe) have been established through the well observed cases. These events can be explained as the prompt collapse to a black hole (BH) of the core of a massive star (M≳40M). The energies of these GRB-SNe were much larger than those of typical SNe, thus these SNe are called Hypernovae (HNe). The case of SN 2006aj/GRB060218 appears different: the GRB was weak and soft, being called an X-Ray Flash (XRF); the SN is dimmer and has very weak oxygen lines. The explosion energy of SN 2006aj was smaller, as was the ejected mass. In our model, the progenitor star had a smaller mass than other GRB-SNe (M~20M), suggesting that a neutron star (NS) rather than a BH was formed. If the nascent NS was strongly magnetized as a magnetar and rapidly spinning, it may launch a weak GRB or an XRF. The peculiar light curve of Type Ib SN 2005bf may also be powered by a magnetar. The blue-shifted nebular emission lines of 2005bf indicate the unipolar explosion possibly related to standing accretion shock instability (SASI) associated with a newly born NS.

Original languageEnglish
Pages (from-to)129-137
Number of pages9
JournalAstrophysics and Space Science
Volume336
Issue number1
DOIs
Publication statusPublished - 2011 Nov
Externally publishedYes

Keywords

  • Gamma-Ray Bursts
  • Hypernovae
  • Magnetar
  • Neutron star
  • Supernovae
  • X-ray flash

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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