Mon. Not. R. Astron. Soc., 389, 955-966 (2008/September-2)
The Type IIb SN 2008ax: spectral and light curve evolution.
PASTORELLO A., KASLIWAL M.M., CROCKETT R.M., VALENTI S., ARBOUR R., ITAGAKI K., KASPI S., GAL-YAM A., SMARTT S.J., GRIFFITH R., MAGUIRE K., OFEK E.O., SEYMOUR N., STERN D. and WIETHOFF W.
Abstract (from CDS):
We present spectroscopy and photometry of the He-rich supernova (SN) 2008ax. The early-time spectra show prominent P-Cygni H lines, which decrease with time and disappear completely about 2 months after the explosion. In the same period Hei lines become the most prominent spectral features. SN 2008ax displays the ordinary spectral evolution of a Type IIb supernova. A stringent pre-discovery limit constrains the time of the shock breakout of SN 2008ax to within only a few hours. Its light curve, which peaks in the B band about 20 d after the explosion, strongly resembles that of other He-rich core-collapse supernovae. The observed evolution of SN 2008ax is consistent with the explosion of a young Wolf-Rayet (of WNL type) star, which had retained a thin, low-mass shell of its original H envelope. The overall characteristics of SN 2008ax are reminiscent of those of SN 1993J, except for a likely smaller H mass. This may account for the findings that the progenitor of SN 2008ax was a WNL star and not a K supergiant as in the case of SN 1993J, that a prominent early-time peak is missing in the light curve of SN 2008ax, and that Hα is observed at higher velocities in SN 2008ax than in SN 1993J.
© 2008 The Authors. Journal compilation © 2008 RAS
supernovae: general - supernovae: individual: SN 2008ax - supernovae: individual: SN 1993J - galaxies: individual: NGC 4490
VizieR on-line data:
<Available at CDS (J/MNRAS/389/955): table1.dat table2.dat>
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