The Transitional Core-Collapse Supernova (SN) 2008ax

Details The Transitional Core-Collapse Supernova (SN) 2008ax The Transitional Core-Collapse Supernova (SN) 2008ax

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332104c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #321.04; Bulletin of the American Astronomical Society, Vol. 41, p.376

Astronomy and Astrophysics

Astronomy

Scientific paper

SN 2008ax in NGC 4490 was discovered within hours of shock breakout, presenting the rare opportunity to study a core-collapse SN beginning with the initial envelope-cooling phase immediately following explosion. We present an extensive sequence of optical and near-infrared spectroscopy, as well as three epochs of optical spectropolarimetry. Our initial spectra, taken two days after shock breakout, are dominated by hydrogen Balmer lines at high velocity. However, by maximum light, He I lines dominated the optical and near-infrared spectra, which closely resembled those of SNe Ib such as SN 1999ex. Early-time spectropolarimetry revealed strong line polarization modulations in excess of 3% across H-alpha, indicating the presence of large asphericities in the outer ejecta. A single epoch of late-time spectropolarimetry, as well as the shapes of the nebular-line profiles, demonstrate that asphericities extended from the outermost layers all the way down to the core of this core-collapse SN.

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