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

Izumi Hachisu, Mariko Kato, Gerardo Juan Manuel Luna

研究成果: Article査読

85 被引用数 (Scopus)


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.

ジャーナルAstrophysical Journal
2 II
出版ステータスPublished - 2007 4月 20

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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