Drout 2010 Ibc型超新星的多波段光变统计

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Title:		The First Systematic Study of Type Ibc Supernova Multi-color Light-curves
Authors:		Drout, Maria R.; Soderberg, Alicia M.; Gal-Yam, A.; Cenko, S. B.; Fox, D. B.; Leonard, D. C.; Sand, D. J.; Moon, D. -S.; Arcavi, I.; Green, Y.
Publication:		eprint arXiv:1011.4959
Publication Date:		11/2010
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		43 pages, 23 figures, 6 tables, submitted to ApJ. High resolution figures and light-curves available at http://www.cfa.harvard.edu/~asoderberg/SNeIbc
Bibliographic Code:		2010arXiv1011.4959D

Abstract

We present detailed optical photometry for 25 Type Ibc supernovae within d~150 Mpc obtained with the robotic Palomar 60-inch telescope in 2004-2007. This study represents the first uniform, systematic, and statistical sample of multi-color SNe Ibc light-curves available to date. We correct the light-curves for host galaxy extinction using a new technique based on the photometric color evolution, namely, we show that the (V-R) color of extinction-corrected SNe Ibc at t~10 days after V-band maximum is tightly distributed, (V-R)=0.26+-0.06 mag. Using this technique, we find that SNe Ibc typically suffer from significant host galaxy extinction, E(B-V)~0.4 mag. A comparison of the extinction-corrected light-curves for SNe Ib and Ic reveals that they are statistically indistinguishable, both in luminosity and decline rate. We report peak absolute magnitudes of M_R=-17.9+-0.9 mag and M_R=-18.3+-0.6 mag for SNe Ib and Ic, respectively. Focusing on the broad-lined SNe Ic, we find that they are more luminous than the normal SNe Ibc sample, M_R=-19.0+-1.1 mag, with a probability of only 1.6% that they are drawn from the same population of explosions. By comparing the peak absolute magnitudes of SNe Ic-BL with those inferred for local engine-driven explosions (GRB-SN 1998bw, XRF-SN 2006aj, and SN2009bb) we find a 25% probability that they are drawn from the SNe Ic-BL population. Finally, we fit analytic models to the light-curves to derive typical Ni-56 masses of M_Ni ~0.2 and 0.5 M_sun for SNe Ibc and SNe Ic-BL, respectively. With reasonable assumptions for the photospheric velocities, we extract kinetic energy and ejecta mass values of M_ej ~ 2 M_sun and E_K~1e+51 erg for SNe Ibc, while for SNe Ic-BL we find higher values, M_ej~5~M_sun and E_K~1e+52 erg. We discuss the implications for the progenitors of SNe Ibc and their relation to engine-driven explosions [ABRIDGED].

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