Multi-Wavelength Properties of the Type IIb SN 2008ax

Abstract

We present the UV, optical, X-ray, and radio properties of the Type IIb SN 2008ax discovered in NGC 4490. The observations in the UV are one of the earliest of a Type IIb supernova (SN). On approximately day four after the explosion, a dramatic upturn in the u and uvw1 (lambda_c = 2600 Angstroms) light curves occurred after an initial rapid decline which is attributed to adiabatic cooling after the initial shock breakout. This rapid decline and upturn is reminiscent of the Type IIb SN 1993J on day six after the explosion. Optical/near-IR spectra taken around the peak reveal prominent H-alpha, HeI, and CaII absorption lines. A fading X-ray source is also located at the position of SN 2008ax, implying an interaction of the SN shock with the surrounding circumstellar material and a mass-loss rate of the progenitor of M_dot = (9+/-3)x10^-6 solar masses per year. The unusual time evolution (14 days) of the 6 cm peak radio luminosity provides further 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 suggests a kinetic energy (E_k) of 0.5x10^51 ergs, an ejecta mass (M_ej) of 2.9 solar masses, and a nickel mass (M_Ni) of 0.06 solar masses.

Accepted to ApJ Letters, 14 pages, 3 figures, 2 tables

References in corpus (7)

• The type IIb SN 2008ax: the nature of the progenitor
• The type IIb SN 2008ax: spectral and light curve evolution
• Long Term Radio Monitoring of SN 1993J
• X-rays from the explosion site: Fifteen years of light curves of SN 1993J
• Direct Analysis of Spectra of the Unusual Type Ib Supernova 2005bf
• The Radio Evolution of SN 2001gd
• 23 GHz VLBI Observations of SN 2008ax

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