On the progenitor and supernova of the sn 2002cx-like supernova 2008ge
Cargando...
Archivos
Fecha
2010
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Nombre de Curso
Licencia CC
Licencia CC
Resumen
We present observations of supernova (SN) 2008ge, which is spectroscopically similar to the peculiar
SN 2002cx, and its pre-explosion site that indicate that its progenitor was probably a white dwarf.
NGC 1527, the host galaxy of SN 2008ge, is an S0 galaxy with no evidence of star formation or massive
stars. Astrometrically matching late-time imaging of SN 2008ge to pre-explosion HST imaging, we
constrain the luminosity of the progenitor star. Since SN 2008ge has no indication of hydrogen or
helium in its spectrum, its progenitor must have lost its outer layers before exploding, requiring
that it be a white dwarf, a Wolf-Rayet star, or a lower-mass star in a binary system. Observations
of the host galaxy show no signs of individual massive stars, star clusters, or H II regions at the
SN position or anywhere else, making a Wolf-Rayet progenitor unlikely. Late-time spectroscopy of
SN 2008ge show strong [Fe II] lines with large velocity widths compared to other members of this class
at similar epochs. These previously unseen features indicate that a significant amount of the SN ejecta
is Fe (presumably the result of radioactive decay of 56Ni generated in the SN), further supporting a
thermonuclear explosion. Placing the observations of SN 2008ge in the context of observations of
other objects in the class of SN, we suggest that the progenitor was most likely a white dwarf.
Notas
Palabras clave
Astrometry, Stars: evolution, Supernovae: general, Supernovae: individual (SN 2008ge)