Fast, Faint, And Massive: Core-collapse Models For Quickly Evolving Supernovae

Details Fast, Faint, And Massive: Core-collapse Models For Quickly Evolving Supernovae Fast, Faint, And Massive: Core-collapse Models For Quickly Evolving Supernovae

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924229k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #242.29

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Scientific paper

Transient surveys have recently discovered several extremely fast-evolving and often faint supernovae. In addition to their unusual light curves, these objects have peculiar spectra that are distinct from those of ordinary supernovae of any type. The explanation most often proposed for these objects involves a small amount of mass and explosion energy ( 0.1 solar masses and 0.1 B, respectively), perhaps from the detonation of a helium shell on a white dwarf in the theoretical ".Ia" model. We generate synthetic spectra and light curves using SEDONA, a Monte Carlo radiative transfer code, and fit them to the data of one of these objects, SN 2010X. Preliminary results suggest that in fact low masses such as in the ".Ia" model have difficulty reproducing certain spectral absorption features. As an alternative, we explore more massive stellar explosions that produce only trace amounts of radioactive material. The resulting light curve is powered almost entirely by the energy from the explosion itself, allowing a core-collapse scenario to fit the short timescales observed. We also test this model against the observations of several other short-lived supernovae and discuss whether they may be produced by similar progenitor situations.

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