Supersoft X-ray light curve of RS Ophiuchi (2006)

Izumi Hachisu, Mariko Kato, Gerardo Juan Manuel Luna

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

One of the candidates for Type la supernova progenitors, the recurrent nova RS Ophiuchi, underwent its sixth recorded outburst in 2006 February, and for the first time a complete light curve of supersoft X-rays has been obtained. It shows the much earlier emergence and longer duration of a supersoft X-ray phase than expected before. These characteristics can be naturally understood when a significant amount of helium layer piles up beneath the hydrogen-burning zone during the outburst, suggesting that the white dwarf (WD) is effectively growing in mass. We have estimated the WD mass in RS Oph to be 1.35 ±0.01 M and the growth rate of the WD mass to be at an average rate of ∼1 × 10-7 M yr-1. The white dwarf will probably reach the critical mass for Type la explosion if the present accretion continues further for a few to several times 105 yr.

Original languageEnglish
JournalAstrophysical Journal
Volume659
Issue number2 II
DOIs
Publication statusPublished - 2007 Apr 20

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light curve
outburst
critical mass
x rays
piles
supernovae
explosions
helium
explosion
pile
accretion
hydrogen

Keywords

  • Binaries: close
  • Binaries: symbiotic
  • Novae, cataclysmic variables
  • Stars: individual (RS Ophiuchi)
  • Supernovae: general
  • White dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Supersoft X-ray light curve of RS Ophiuchi (2006). / Hachisu, Izumi; Kato, Mariko; Luna, Gerardo Juan Manuel.

In: Astrophysical Journal, Vol. 659, No. 2 II, 20.04.2007.

Research output: Contribution to journalArticle

Hachisu, Izumi ; Kato, Mariko ; Luna, Gerardo Juan Manuel. / Supersoft X-ray light curve of RS Ophiuchi (2006). In: Astrophysical Journal. 2007 ; Vol. 659, No. 2 II.
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