V445 puppis

Helium nova on a massive white dwarf

Mariko Kato, Izumi Hachisu

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The 2000 outburst of V445 Puppis shows unique properties, such as the absence of hydrogen, the enrichment of helium and carbon, and the slow development of the light curve with a small amplitude that does not resemble any classical novae. This object has been suggested to be the first example of a helium nova. We calculate theoretical light curves of helium novae and reproduce the observational light curve of V445 Pup. Modeling indicates a very massive white dwarf (WD), more massive than 1.3 M. The companion star is possibly either a helium star or a helium-rich main-sequence star. We estimate the ignition mass as several times 10-5 M , the corresponding helium accretion rate as several times 10-7 M yr-1, and the recurrence period as several tens of years. These values suggest that the WD is growing in mass and ends up either a Type la supernova or an accretion-induced collapse to a neutron star.

Original languageEnglish
JournalAstrophysical Journal
Volume598
Issue number2 II
DOIs
Publication statusPublished - 2003 Dec 1

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helium
light curve
novae
B stars
companion stars
main sequence stars
accretion
ignition
neutron stars
supernovae
outburst
carbon
hydrogen
estimates
modeling

Keywords

  • Binaries: close
  • Novae, cataclysmic variables
  • Stars: individual (V445 Puppis)
  • White dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

V445 puppis : Helium nova on a massive white dwarf. / Kato, Mariko; Hachisu, Izumi.

In: Astrophysical Journal, Vol. 598, No. 2 II, 01.12.2003.

Research output: Contribution to journalArticle

Kato, Mariko ; Hachisu, Izumi. / V445 puppis : Helium nova on a massive white dwarf. In: Astrophysical Journal. 2003 ; Vol. 598, No. 2 II.
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