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arXiv 0912.2880astro-ph.SR
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II型线性SN 2009 kr的大规模祖先

The Massive Progenitor of the Type II-Linear SN 2009kr

N. Elias-Rosa, S. D. Van Dyk, W. Li, A. A. Miller, J. M. Silverman, M. Ganeshalingam, A. F. Boden, M. M. Kasliwal, J. Vinko, J. -C. Cuillandre, A. V. Filippenko… 展开作者

N. Elias-Rosa, S. D. Van Dyk, W. Li, A. A. Miller, J. M. Silverman, M. Ganeshalingam, A. F. Boden, M. M. Kasliwal, J. Vinko, J. -C. Cuillandre, A. V. Filippenko, T. N. Steele, J. S. Bloom, C. V. Griffith, I. K. W. Kleiserand, R. J. Foley

摘要:

本文介绍了NGC 1832中超新星2009 kr的早期光度和光谱观测结果。我们发现,它的属性到目前为止支持它的分类为II型线性(SN II-L),一个相对罕见的子类的核心塌陷超新星(SNe)。我们还确定了一个候选人的SN祖星通过比较爆炸前,档案图像与WFPC 2上的哈勃太空望远镜(HST)与SN图像使用自适应光学(AO)加上NIRC 2上的10米的哈勃-II望远镜。虽然宿主星系的距离(~26 Mpc)很大,在相对天体测量中造成很大的不确定性,但我们发现,如果这个候选星系确实是祖先星系,它是一个高亮度(M_V = -7.8 mag)的黄超巨星,初始质量约为18-24 M_sun。这将是第一次直接鉴定SN II-L的祖细胞。它的质量可能是更常见的II型坪SN(SNe II-P)的初始质量上限和一个II型窄SN(SN IIn)的推断初始质量估计之间的桥梁。

英文摘要:

We present early-time photometric and spectroscopic observations of supernova (SN) 2009kr in NGC 1832. We find that its properties to date support its classification as Type II-linear (SN II-L), a relatively rare subclass of core-collapse supernovae (SNe). We have also identified a candidate for the SN progenitor star through comparison of pre-explosion, archival images taken with WFPC2 onboard the Hubble Space Telescope (HST) with SN images obtained using adaptive optics (AO) plus NIRC2 on the 10-m Keck-II telescope. Although the host galaxy's substantial distance (~26 Mpc) results in large uncertainties in the relative astrometry, we find that if this candidate is indeed the progenitor, it is a highly luminous (M_V = -7.8 mag) yellow supergiant with initial mass ~18-24 M_sun. This would be the first time that a SN II-L progenitor has been directly identified. Its mass may be a bridge between the upper initial mass limit for the more common Type II-plateau SNe (SNe II-P) and the inferred initial mass estimate for one Type II-narrow SN (SN IIn).

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