The explosion of supernova 2011fe in the frame of the core-degenerate scenario

• Autores: Soker, Noam; García Berro, Enrique; Althaus, Leandro Gabriel
• Año de publicación: 2013
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Astronómicas; Supernovae: Individual: Sn 2011fe; Supernovae: General
• Institución: Universidad Nacional de La Plata

We argue that the properties of the Type Ia supernova (SN Ia) SN 2011fe can be best explained within the frame of the core-degenerate (CD) scenario. In the CD scenario, a white dwarf (WD) merges with the core of an asymptotic giant branch (AGB) star and forms a rapidly rotating WD, with a mass close to and above the critical mass for explosion. Rapid rotation prevents immediate collapse and/or explosion. Spinning down over a time of 0-10¹⁰ yr brings theWD to explosion. A very long delayed explosion to post-crystallization phase, which lasts for about 2 × 10⁹ yr, leads to the formation of a highly carbon-enriched outer layer. This can account for the carbon-rich composition of the fastest-moving ejecta of SN 2011fe. In reaching the conclusion that the CD scenario best explains the observed properties of SN 2011fe, we consider both its specific properties, like a very compact exploding object and carbon-rich composition of the fastest-moving ejecta, and the general properties of SNe Ia.
Facultad de Ciencias Astronómicas y Geofísicas