Your browser doesn't support javascript.
loading
A helium-burning white dwarf binary as a supersoft X-ray source.
Greiner, J; Maitra, C; Haberl, F; Willer, R; Burgess, J M; Langer, N; Bodensteiner, J; Buckley, D A H; Monageng, I M; Udalski, A; Ritter, H; Werner, K; Maggi, P; Jayaraman, R; Vanderspek, R.
Afiliación
  • Greiner J; Max-Planck-Institut für extraterrestrische Physik, Garching, Germany. jcg@mpe.mpg.de.
  • Maitra C; Max-Planck-Institut für extraterrestrische Physik, Garching, Germany.
  • Haberl F; Max-Planck-Institut für extraterrestrische Physik, Garching, Germany.
  • Willer R; Max-Planck-Institut für extraterrestrische Physik, Garching, Germany.
  • Burgess JM; Max-Planck-Institut für extraterrestrische Physik, Garching, Germany.
  • Langer N; Argelander-Institut für Astronomie, Universität Bonn, Bonn, Germany.
  • Bodensteiner J; Max-Planck-Institut für Radioastronomie, Bonn, Germany.
  • Buckley DAH; ESO - European Organisation for Astronomical Research in the Southern Hemisphere, Garching, Germany.
  • Monageng IM; South African Astronomical Observatory, Cape Town, South Africa.
  • Udalski A; Department of Physics, University of the Free State, Bloemfontein, South Africa.
  • Ritter H; Department of Astronomy, University of Cape Town, Cape Town, South Africa.
  • Werner K; South African Astronomical Observatory, Cape Town, South Africa.
  • Maggi P; Department of Astronomy, University of Cape Town, Cape Town, South Africa.
  • Jayaraman R; Astronomical Observatory, University of Warsaw, Warsaw, Poland.
  • Vanderspek R; Max-Planck-Institut für Astrophysik, Garching, Germany.
Nature ; 615(7953): 605-609, 2023 03.
Article en En | MEDLINE | ID: mdl-36949334
Type Ia supernovae are cosmic distance indicators1,2, and the main source of iron in the Universe3,4, but their formation paths are still debated. Several dozen supersoft X-ray sources, in which a white dwarf accretes hydrogen-rich matter from a non-degenerate donor star, have been observed5 and suggested as Type Ia supernovae progenitors6-9. However, observational evidence for hydrogen, which is expected to be stripped off the donor star during the supernova explosion10, is lacking. Helium-accreting white dwarfs, which would circumvent this problem, have been predicted for more than 30 years (refs. 7,11,12), including their appearance as supersoft X-ray sources, but have so far escaped detection. Here we report a supersoft X-ray source with an accretion disk whose optical spectrum is completely dominated by helium, suggesting that the donor star is hydrogen-free. We interpret the luminous and supersoft X-rays as resulting from helium burning near the surface of the accreting white dwarf. The properties of our system provide evidence for extended pathways towards Chandrasekhar-mass explosions based on helium accretion, in particular for stable burning in white dwarfs at lower accretion rates than expected so far. This may allow us to recover the population of the sub-energetic so-called Type Iax supernovae, up to 30% of all Type Ia supernovae13, within this scenario.
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2023 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2023 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido