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arXiv 1402.2896astro-ph.HE
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Ia型超新星SN2014J前身的光度上限

Upper limits on the luminosity of the progenitor of type Ia supernova SN2014J

M. T. B. Nielsen, M. Gilfanov, A. Bogdan, T. E. Woods, G. Nelemans

摘要:

我们分析了钱德拉对SN 2014 J在M82中位置的爆炸前观测的档案数据。在数据中没有检测到这个位置的X射线源,我们计算了祖先亮度的上限。这些上限使我们能够坚定地排除一个清晰的超软X射线源祖光球半径相当于半径的白矮星附近的卡拉塞卡质量(~1.38 M_太阳)和质量吸积率的间隔,稳定的核燃烧可以发生。然而,由于超新星的光学观测暗示了相对较大的氢柱密度,我们不能排除具有较低温度的超软源,kT < 80 eV。我们发现超新星位于一个大的软漫射发射结构的中心,大约200 pc宽。该气体的质量约为3x10^4 M_sun,冷却时间短,tau_cool约为8 Myrs,表明它是一个超新星膨胀的超级气泡,与最近的恒星形成区域有关。如果SN 2014 J确实位于气泡内,它可能属于Ia型超新星的瞬发族群,延迟时间短至约5000万年。最后,我们分析了现有的一个后超新星钱德拉观测,并将超新星本身的X射线光度上限定为~(1-2)10^37 erg/s。

英文摘要:

We analysed archival data of Chandra pre-explosion observations of the position of SN2014J in M82. No X-ray source at this position was detected in the data, and we calculated upper limits on the luminosities of the progenitor. These upper limits allow us to firmly rule out an unobscured supersoft X-ray source progenitor with a photospheric radius comparable to the radius of white dwarf near the Chandrasekhar mass (~1.38 M_sun) and mass accretion rate in the interval where stable nuclear burning can occur. However, due to a relatively large hydrogen column density implied by optical observations of the supernova, we cannot exclude a supersoft source with lower temperatures, kT < 80 eV. We find that the supernova is located in the centre of a large structure of soft diffuse emission, about 200 pc across. The mass, ~3x10^4 M_sun and short cooling time of the gas, tau_cool ~ 8 Myrs, suggest that it is a supernova-inflated super-bubble, associated with the region of recent star formation. If SN2014J is indeed located inside the bubble, it likely belongs to the prompt population of type Ia supernovae, with a delay time as short as ~ 50 Myrs. Finally, we analysed the one existing post-supernova Chandra observation and placed upper limit of ~ (1-2) 10^37 erg/s on the X-ray luminosity of the supernova itself.

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