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arXiv 2302.01276astro-ph.HE
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新星爆发--迷人的gamma-ray发射周期性新星RS蛇夫座

Nova explosions -- The fascinating gamma-ray emitting recurrent nova RS Ophiuchi

Vincent Tatischeff, Margarita Hernanz

摘要:

经典的和周期性的新星爆发发生在白矮星的顶部,白矮星从伴星或红巨星中吸积富氢物质,在一个紧密的双星系统中。近年来,自2008年美国宇航局发射费米伽马射线卫星以来,费米/LAT(LAT:大面积望远镜)在高能伽马射线中探测到了几颗新星,能量大于100 MeV。已知这种辐射与热核新星爆炸后早期发生的内部和/或外部冲击中的粒子加速有关。然而,由于新星爆炸而产生的能量大于100 GeV的甚高能(VHE)伽马射线直到最近才在2021年8月爆发的复发新星RS Oph中被发现。这需要质子的加速,而不仅仅是电子的加速;这实际上是在理论上预测的-基于其他波长的观测-在2006年的RS Oph爆发中,但直到现在还没有被观测证实。我们回顾了不同类型的伽玛射线发射在新星的起源和突出的相关性,最近VHE伽玛射线发射发现的新星理论,主要是在该领域的质量喷射和相关的粒子(电子和质子)加速过程。

英文摘要:

Classical and recurrent nova explosions occur on top of white dwarfs accreting H-rich matter from a companion main sequence or red giant star, in a close binary system. In the recent years, since the launch of the Fermi gamma-ray satellite by NASA in 2008, several novae have been detected by Fermi/LAT (LAT: Large Area Telescope) in high-energy (HE) gamma rays, with energies larger than 100 MeV. This emission is known to be related to the acceleration of particles in the internal and/or external shocks occurring early after the thermonuclear nova explosion. However, very-high-energy (VHE) gamma-rays, with energies larger than 100 GeV, produced as a consequence of nova explosions have only been discovered very recently, in the recurrent nova RS Oph, that had an outburst in August 2021. These require the acceleration of protons, and not only of electrons; this was in fact predicted theoretically - based in observations at other wavelengths - in the previous eruption of RS Oph, in 2006, but has not been confirmed observationally until now. We review the origin of the different types of gamma-ray emission in novae and highlight the relevance of the recent VHE gamma-ray emission discoveries for the nova theory, mainly in the field of the mass ejection and the associated particle (electrons and protons) acceleration processes.

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