SNe 2005ay and 2005cs: Two interesting II-Plateau events

Details SNe 2005ay and 2005cs: Two interesting II-Plateau events SNe 2005ay and 2005cs: Two interesting II-Plateau events

2006-11-06

arxiv.org/abs/astro-ph/0611186v1

Astronomy and Astrophysics

Astrophysics

5 pages. Proceedings of the conference ``The Multicoloured Landscape of Compact Objects and their Explosive Origins'', 2006 Ju

Scientific paper

The "U,B,V,R,I" light curves of the type IIP supernovae (SNe IIP) SN 2005ay and SN 2005cs, and one spectrum for SN 2005cs, are presented and analyzed. We found both events to be fainter than the average SN IIP, with SN 2005cs showing slight brightening in the second half of plateau stage in the $V,R,I$ bands and a low expansion velocity. The effects of two different plausible distance moduli on the derived physical parameters of SN 2005ay are considered. Two approaches are used to estimate the expansion velocities at the middle of the plateau phase. Based on empirical analytical models we derived constraints on the progenitor properties. The amounts of the ejected $^{56}$Ni are also recovered.

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