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arXiv 2507.01331astro-ph.HE
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Ia型超新星残骸中生存下来的M矮星伴星

Supernova Ia Remnants with M dwarf surviving companions

National Tsing Hua University(国立清华大学);Universidad de La Laguna(拉古纳大学)

Kuo-Chuan Pan, Pilar Ruiz-Lapuente, Jonay I. González Hernández

AI总结:

研究Ia型超新星残骸中存活的M矮星伴星,通过模拟和建模揭示其可能的形成机制与演化过程。

摘要:

我们研究了Ia型超新星可能由双星系统产生的情况,其中爆炸的白矮星伴星是一颗M矮星。这种伴星会表现为一颗 runaway 星,保留其爆炸前的轨道速度并受到超新星喷射物的冲击。它可能快速旋转,因为在非常紧密的双星系统中被白矮星潮汐锁定。为了这项研究,我们进行了多维水动力学模拟,以研究M矮星伴星与SN喷射物的相互作用,随后使用MESA代码进行喷射后恒星演化的建模。我们的初始模型在3D模拟中具有高自转角动量,并且包含了磁制动的影响。这些影响显著降低了最终的自转速度。一个可能的存活伴星候选者MV-G272最近在超新星残骸G272.2-3.2中被发现,尽管它是一个8.9σ的proper motion异常体,尽管缓慢旋转。我们的结果表明,该伴星的属性(光度、有效温度、表面重力)可以通过喷射后M矮星模型重现。缓慢旋转,这是与几个提出的超高速SN伴星共同特征,可以通过喷射后演化的磁制动解释,从而支持MV-G272星是现在发现为G272.2-3.2 SNR的Ia型超新星残骸的存活伴星的可能性。

英文摘要:

We study the possibility that Type Ia supernovae might be produced by binary systems where the companion of the exploding white dwarf is an M-dwarf star. Such companion would appear as a runaway star, retaining its pre-explosion orbital velocity along with a kick imparted by the supernova ejecta. It might be rapidly rotating, from being tidally locked with the white dwarf prior to explosion in a very close binary. For this study, we perform a series of multidimensional hydrodynamic simulations to investigate the interaction between M-dwarf companions and SN ejecta, followed by post-impact stellar evolution modeling using the MESA code. Our initial models in the 3D simulations had high spin angular momenta and the effects of magnetic braking have been included. They very significantly reduce the final rotation. A surviving companion candidate, MV-G272, has recently been discovered in the supernova remnant G272.2-3.2, which is an 8.9$σ$ proper motion outlier, although being slowly rotating. Our results show that the properties of this companion (luminosity, effective temperature, surface gravity) can be reproduced by our post-impact M-dwarf models. The slow rotation, which is a common characteristic with several proposed hypervelocity SN companions, can be explained by magnetic braking during the post-impact evolution, thus supporting the possibility that the MV-G272 star is the surviving companion of the Type Ia supernova now found as G272.2-3.2 SNR.

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