arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2501.03316astro-ph.HEastro-ph.SR
收藏

新生中子星或黑洞对恒星的潮汐瓦解:贫氢(超)亮超新星与快速蓝色光学暂现源的一种机制

Stellar Tidal Disruptions by Newborn Neutron Stars or Black Holes: A Mechanism for Hydrogen-poor (Super)luminous Supernovae and Fast Blue Optical Transients

Daichi Tsuna, Wenbin Lu

AI总结:

本文提出新生中子星或黑洞受natal kick撞击并潮汐瓦解双星伴星,通过超爱丁顿吸积风与超新星抛射物碰撞转化为辐射,从而解释贫氢(超)亮超新星与快速蓝色光学暂现源的机制。

摘要:

Ibc型贫氢超新星(SNe)是大质量恒星的爆发,这些恒星失去了氢包层,通常是由于与双星伴星的相互作用所致。我们考虑这样一种情况:赋予中子星(NS)或黑洞(BH)残骸的natal kick使该致密天体与主序伴星发生碰撞,最终导致伴星被完全潮汐瓦解。随后,NS/BH上的超爱丁顿吸积引发一股强大的快速风流,该风流与超新星抛射物碰撞,并有效地将风的动能转化为辐射。周围的抛射物对辐射进行再处理,使其成为一次明亮的(峰值约$10^{44}$ erg s$^{-1}$)、持续数天至数月的暂现事件,其光学峰值在$-19$至$-21$星等之间,与(超)亮Ibc型超新星以及像AT2018cow这样的快速蓝色光学暂现源(FBOTs)相当。通过蒙特卡洛分析,我们估计双星中超新星后发生潮汐瓦解的比例约为$0.1$--$1$\%,与这些明亮超新星的事件发生率大致相符。在宏观层面上,我们的模型重现了FBOTs的多波长和光谱观测结果,并具有解释某些(超)亮超新星中难以通过常规磁星自旋减慢机制重现的奇特特征的潜力,例如晚期的氢谱线、颠簸的光变曲线以及峰值前过量现象。

英文摘要:

Hydrogen-poor supernovae (SNe) of Type Ibc are explosions of massive stars that lost their hydrogen envelopes, typically due to interactions with a binary companion. We consider the case where the natal kick imparted to the neutron star (NS) or black hole (BH) remnant brings the compact object to a collision with a main-sequence companion, eventually leading to full tidal disruption of the companion. Subsequently, super-Eddington accretion onto the NS/BH launches a powerful, fast wind which collides with the SN ejecta and efficiently converts the kinetic energy of the wind into radiation. The radiation is reprocessed by the surrounding ejecta into a luminous ($\sim 10^{44}$ erg s$^{-1}$ at peak), days to months-long transient with optical peaks from $-19$ to $-21$ mag, comparable to (super)luminous Type Ibc SNe and fast blue optical transients (FBOTs) like AT2018cow. From a Monte-Carlo analysis we estimate the fraction of tidal disruptions following SNe in binaries to be $\sim 0.1$--$1$\%, roughly compatible with the event rates of these luminous SNe. At the broad-brush level, our model reproduces the multi-wavelength and spectral observations of FBOTs, and has the potential to explain peculiar features seen in some (super)luminous SNe which are difficult to reproduce by the conventional magnetar spindown mechanism, such as late-time hydrogen lines, bumpy light curves, and pre-peak excess.

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。

↑