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arXiv 1008.4353astro-ph.SR
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用SN2009ku发现的Pan-STARRS-1观测研究Ia型超新星类SN 2002 cx的异源性

Displaying the Heterogeneity of the SN 2002cx-like Subclass of Type Ia Supernovae with Observations of the Pan-STARRS-1 Discovered SN2009ku

G. Narayan, R. J. Foley, E. Berger, M. T. Botticella, R. Chornock, M. E. Huber, A. Rest, D. Scolnic, S. Smartt, A. M. Soderberg, W. S. Burgett, K. C. Chambers, … 展开作者

G. Narayan, R. J. Foley, E. Berger, M. T. Botticella, R. Chornock, M. E. Huber, A. Rest, D. Scolnic, S. Smartt, A. M. Soderberg, W. S. Burgett, K. C. Chambers, G. Gates, T. Grav, N. Kaiser, R. P. Kirshner, E. A. Magnier, J . S. Morgan, P. A. Price, A. G. Riess, C. W. Stubbs, W. E. Sweeney, J. L. Tonry, R. J. Wainscoat, W. M. Wood-Vasey

摘要:

SN 2009 ku是由Pan-STARRS-1发现的Ia型超新星(SNIa),也是SNeIa中类似SN 2002 cx的成员。它的光变曲线类似于原型SN 2002 cx,但稍宽,并且在g值上有一个较晚的上升。SN 2009 ku比其他类似SN 2002 cx的天体更亮(约0.6等),峰值为M_V = -18.4等,仍然比典型的SNeIa暗得多。SN 2009 ku在最大亮度后18天的喷出物速度约为2000 km ^-1,从光谱学上看,它与SN 2008 ha最为相似,后者也有极低速的喷出物。然而,SN 2008 ha的亮度非常低,峰值在M_V = -14.2等,比SN 2009 ku暗约4等。SN 2009 ku的高光度和低喷出物速度的对比与SN 2002 cx类的新兴趋势相反。SN 2009 ku是一个反例,以前认为这个类比典型的SNeIa更均匀,表明这个类有不同的祖先群体和/或复杂的爆炸物理。SN 2009 ku是新一代瞬变巡天中这类天体的第一个例子,表明这些巡天有可能发现稀有和有趣的天体。

英文摘要:

SN2009ku, discovered by Pan-STARRS-1, is a Type Ia supernova (SNIa), and a member of the distinct SN2002cx-like class of SNeIa. Its light curves are similar to the prototypical SN2002cx, but are slightly broader and have a later rise to maximum in g. SN2009ku is brighter (~0.6 mag) than other SN2002cx-like objects, peaking at M_V = -18.4 mag - which is still significantly fainter than typical SNeIa. SN2009ku, which had an ejecta velocity of ~2000 kms^-1 at 18 days after maximum brightness is spectroscopically most similar to SN2008ha, which also had extremely low-velocity ejecta. However, SN2008ha had an exceedingly low luminosity, peaking at M_V = -14.2 mag, ~4 mag fainter than SN2009ku. The contrast of high luminosity and low ejecta velocity for SN2009ku is contrary to an emerging trend seen for the SN2002cx class. SN2009ku is a counter-example of a previously held belief that the class was more homogeneous than typical SNeIa, indicating that the class has a diverse progenitor population and/or complicated explosion physics. As the first example of a member of this class of objects from the new generation of transient surveys, SN2009ku is an indication of the potential for these surveys to find rare and interesting objects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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