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26 April 2024 |
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On the Progenitor of the Type II Supernova 2004et in NGC 6946 | | Weidong Li
; Schuyler D. Van Dyk
; Alexei V. Filippenko
; Jean-Charles Cuillandre
; | | Date: |
17 Dec 2004 | | Subject: | astro-ph | | Affiliation: | UC Berkeley, Spitzer/Caltech, CFHT | | Abstract: | Supernova (SN) 2004et is the eighth historical SN in the nearby spiral galaxy NGC 6946. Here we report on early photometric and spectroscopic monitoring of this object. SN 2004et is a Type II event, exhibiting a plateau in its light curves, but its spectral and color evolution appear to differ significantly from those of other, more normal Type II-plateau (II-P) SNe. We have analyzed Canada-France-Hawaii Telescope (CFHT) images of the host galaxy taken prior to the SN explosion, identifying a candidate progenitor for the SN. The star’s absolute magnitude and intrinsic color imply that it was a yellow, rather than red, supergiant star, with an estimated zero-age main sequence mass of $15^{+5}_{-2} M_odot$. Although this mass estimate is consistent with estimates and upper limits for the progenitors of other, more normal SNe II-P, the SN 2004et progenitor’s unusual color could further imply a pre-explosion evolutionary history analogous to, but less extreme than, that for the progenitors of the peculiar Type II-P SN 1987A or the Type IIb SN 1993J. The identity of the progenitor candidate needs to be verified when the SN has significantly dimmed. | | Source: | arXiv, astro-ph/0412487 | | Services: | Forum | Review | PDF | Favorites | |
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