On the progenitor and early evolution of the type II supernova 2009kr

Details On the progenitor and early evolution of the type II supernova 2009kr On the progenitor and early evolution of the type II supernova 2009kr

2009-12-10

arxiv.org/abs/0912.2071v1

Astrophys.J.714:L80-L284,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Submitted to ApJ Letters

Scientific paper

10.1088/2041-8205/714/2/L280

We report the identification of a source coincident with SN 2009kr in HST pre-explosion images. The object appears to be a single point source with an intrinsic colour V-I = 1.1 and M_V = -7.6. If this is a single star it would be a yellow supergiant of log L/L_{sol} \sim 5.1 and a mass of 15 (+5/-4) M_{sol}. The spatial resolution does not allow us yet to definitively determine if the progenitor object is a single star, a binary system, or a compact cluster. We show that the early lightcurve is flat, similar to IIP SNe, but that the the spectra are somewhat peculiar, displaying unusual P-Cygni profiles. The evolution of the expanding ejecta will play an important role in understanding the progenitor object.

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