Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534203r&link_type=abstract
American Astronomical Society, AAS Meeting #215, #342.03; Bulletin of the American Astronomical Society, Vol. 42, p.448
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the UV, optical, X-ray, and radio properties of the Type IIb SN 2008ax. The observations in the UV are one of the earliest of a Type IIb supernova. Approximately four days after the explosion, a dramatic upturn in the Swift UV/Optical Telescope u- and uvw1-filter light curves occurs after an initial rapid decline. This is attributed to adiabatic cooling after the initial shock breakout. Optical/near-IR spectra taken around the peak reveal prominent H-alpha, HeI, and CaII absorption lines. A fading X-ray source is also seen implying an interaction of the supernova shock with the surrounding circumstellar material. Both the X-ray data and the unusual time evolution of the 6 cm peak radio luminosity provide evidence that the mass-loss rate is low. Combining the UV, optical, X-ray, and radio data with models of helium exploding stars implies the progenitor of SN 2008ax was an unmixed star in an interacting-binary. Modeling of the SN light curve provides constraints on the kinetic energy, ejecta mass, and nickel mass.
Brown Patrick
Holland Simon
Hoversten Erik
Immler Stefan
Milne Peter
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