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Ia型超新星前身星SN2007sr的X射线和光学光度极限

Limits on the X-ray and optical luminosity of the progenitor of the type Ia supernova SN2007sr

Gijs Nelemans, Rasmus Voss, Gijs Roelofs, Cees Bassa

摘要:

我们目前的HST/WFPC 2,GALEX和钱德拉观测的Ia型超新星SN 2007 sr的位置在银河系,采取爆炸前。在任何观测中都没有发现任何来源,这使我们能够对祖先的光度进行有趣的限制。总共有大约450千秒的钱德拉数据,分布在7个不同的观测中。推导出FUV(23.7 AB等)、NUV(23.8 AB等)、F555 W(26.5 Vega等)和F814 W(24.5-25 Vega等)的极限星等。令人惊讶的是,我们对超新星的距离知之甚少,基于红巨星分支尖端的最新距离(13.3 Mpc)和SN 2007 sr光变曲线得出的距离(25 Mpc)之间几乎相差2倍。使用这些距离,我们得到的绝对光学和UV幅度的任何祖限制,但这些仍然高于最亮的(共生)提出的祖。根据钱德拉的数据,在0.3-1 keV范围内,发现了X射线光度的3 σ上限为0.5 - 8.0 10^37 erg/s,这低于我们最近发现的Ia型超新星2007的潜在祖先的X射线光度,我们报告了它的校正后的X射线光度。如果这颗超新星的祖先被证实,这表明这两颗超新星有不同的祖先。X射线的极限与银河系、大麦哲伦星云和小麦哲伦星云中最亮的超软X射线源相当,并且明显低于在附近星系中发现的最亮的超软和准软X射线源的光度,排除了这种源作为Ia型超新星的祖先。

英文摘要:

We present HST/WFPC2, GALEX and Chandra observations of the position of the type Ia supernova SN2007sr in the Antennae galaxies, taken before the explosion. No source is found in any of the observations, allowing us to put interesting constraints on the progenitor luminosity. In total there is about 450 kilosecond of Chandra data, spread over 7 different observations. Limiting magnitudes of FUV (23.7 AB mag), NUV (23.8 AB mag), F555W (26.5 Vega mag) and F814W (24.5-25 Vega mag) are derived. The distance to the Antennae is surprisingly poorly known, with almost a factor of 2 difference between the latest distance based on the tip of the red giant branch (13.3 Mpc) and the distance derived from the SN2007sr light curve (25 Mpc). Using these distances we derive limits on absolute optical and UV magnitudes of any progenitor but these are still above the brightest (symbiotic) proposed progenitors. From the Chandra data a 3 sigma upper limit to the X-ray luminosity of 0.5 -- 8.0 10^37 erg/s in the 0.3-1 keV range is found. This is below the X-ray luminosity of the potential progenitor of the type Ia supernova 2007on that we recently discovered and for which we report a corrected X-ray luminosity. If that progenitor is confirmed it suggests the two supernovae have different progenitors. The X-ray limit is comparable to the brightest supersoft X-ray sources in the Galaxy, the LMC and the SMC and significantly below the luminosities of the brightest supersoft and quasi-soft X-ray sources found in nearby galaxies, ruling out such sources as progenitors of this type Ia supernova.

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