Properties of Type II Plateau Supernova SNLS-04D2dc: Multicolor Light Curves of Shock Breakout and Plateauстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Shock breakout is the brightest radiative phenomenon in a Type II
supernova (SN). Although it was predicted to be bright, direct
observation is difficult due to the short duration and
X-ray/ultraviolet-peaked spectra. First entire observations of the shock
breakouts of Type II Plateau SNe (SNe IIP) were reported in 2008 by
ultraviolet and optical observations by the Galaxy Evolution Explorer
satellite and supernova legacy survey (SNLS), named SNLS-04D2dc and
SNLS-06D1jd. We present multicolor light curves of an SN IIP, including
the shock breakout and plateau, calculated with a multigroup radiation
hydrodynamical code STELLA and an evolutionary progenitor model. The
synthetic multicolor light curves reproduce well the observations of
SNLS-04D2dc. This is the first study to reproduce the ultraviolet light
curve of the shock breakout and the optical light curve of the plateau
consistently. We conclude that SNLS-04D2dc is the explosion with a
canonical explosion energy 1.2 {\times} 10$^{51}$ erg and that its
progenitor is a star with a zero-age main-sequence mass 20 M
$_{sun}$ and a presupernova radius 800 R $_{sun}$. The model
demonstrates that the peak apparent B-band magnitude of the shock
breakout would be m $_{B}$ \~{} 26.4 mag if an SN identical to
SNLS-04D2dc occurs at a redshift z = 1, which can be reached by 8m-class
telescopes. The result evidences that the shock breakout has a great
potential to detect SNe IIP at z gsim 1.