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

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.

preprint2009arXivOpen access
M. FraserK. TakatsA. PastorelloS. J. SmarttS. MattilaM-T. BotticellaS. ValentiM. ErgonJ. SollermanS. BenettiF. BufanoR. M. CrockettI. J. DanzigerJ. R. MaundS. TaubenbergerM. Turatto
astro-ph.COastro-ph.SR
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Open access16 authors2 topics
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M. FraserK. TakatsA. PastorelloS. J. SmarttS. MattilaM-T. BotticellaS. ValentiM. ErgonJ. SollermanS. BenettiF. BufanoR. M. CrockettI. J. DanzigerJ. R. MaundS. TaubenbergerM. Turatto

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