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arXiv 1302.7067astro-ph.HE
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SN 2011 ja的前身:来自星周相互作用的线索

The progenitor of SN 2011ja: Clues from circumstellar interaction

Sayan Chakraborti, Alak Ray, Randall Smith, Stuart Ryder, Naveen Yadav, Firoza Sutaria, Vikram V. Dwarkadas, Poonam Chandra, David Pooley, Rupak Roy

摘要:

大质量恒星,可能是红超巨星,在核心坍缩之前保留着扩展的氢包层,产生II型高原(IIP)超新星。这些爆炸的喷出物冲击了起源于祖先在其生命的最后阶段质量损失的星周物质。这种相互作用将粒子加速到相对论能量,然后通过激波放大的磁场中的同步辐射和逆康普顿散射对超新星的光子失去能量。这些过程在电磁波谱的无线电和X射线部分产生不同的特征。一起观察,他们允许我们打破冲击加速和磁场放大之间的简并。在这项工作中,我们使用的X射线观测钱德拉和无线电观测ATCA研究的相对重要性的过程中,加速粒子和那些放大磁场产生的非热辐射SN 2011 ja。我们用无线电观测来确定爆炸日期。多个钱德拉观测使我们能够探测祖先的可变质量损失的历史。喷出物膨胀成一个低密度的气泡,然后与来自一颗红超巨星的高密度风相互作用,这颗红超巨星的质量大于16个太阳质量。我们的结果表明,一小部分IIP型超新星可能与非稳定风形成的星周介质相互作用。

英文摘要:

Massive stars, possibly red supergiants, which retain extended hydrogen envelopes until core collapse, produce Type II Plateau (IIP) supernovae. The ejecta from these explosions shock the circumstellar matter originating from the mass loss of the progenitor during the final phases of its life. This interaction accelerates particles to relativistic energies which then lose energy via synchrotron radiation in the shock-amplified magnetic fields and inverse Compton scattering against optical photons from the supernova. These processes produce different signatures in the radio and X-ray part of the electromagnetic spectrum. Observed together, they allow us to break the degeneracy between shock acceleration and magnetic field amplification. In this work we use X-rays observations from the Chandra and radio observations from the ATCA to study the relative importance of processes which accelerate particles and those which amplify magnetic fields in producing the non-thermal radiation from SN 2011ja. We use radio observations to constrain the explosion date. Multiple Chandra observations allow us to probe the history of variable mass loss from the progenitor. The ejecta expands into a low density bubble followed by interaction with a higher density wind from a red supergiant consistent with ZAMS mass greater than 16 solar masses. Our results suggest that a fraction of type IIP supernovae may interact with circumstellar media set up by non-steady winds.

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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