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arXiv 2605.23637astro-ph.HEastro-ph.SR
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SN 2019vxm(相互作用型IIn超新星)的长期光学和近红外测光演化

Long-term optical and near-infrared photometric evolution of SN 2019vxm, an interacting Type IIn supernova

HUN-REN CSFK, Konkoly Observatory(匈牙利科学院研究网络恒星物理研究所孔科伊天文台);MTA Centre for Excellence(匈牙利科学院卓越中心);ELTE Eötvös Loránd University, Institute of Physics and Astronomy(厄特沃什·罗兰大学物理与天文学研究所);MTA–HUN-REN CSFK Lendület “Momentum” Stellar Pulsation Research Group(匈牙利科学院-匈牙利科学院研究网络恒星物理研究所Lendület“动量”恒星脉动研究组);Department of Experimental Physics, University of Szeged(塞格德大学实验物理系);Department of Astrophysical Sciences, Princeton University(普林斯顿大学天体科学系)
Klára Lelkes, László Molnár, József Vinkó, Attila Bódi, Zsófia Bora, Borbála Cseh, Csilla Kalup, Réka Könyves-Tóth, Levente Kriskovics, András Ordasi, András Pá… 展开作者

Klára Lelkes, László Molnár, József Vinkó, Attila Bódi, Zsófia Bora, Borbála Cseh, Csilla Kalup, Réka Könyves-Tóth, Levente Kriskovics, András Ordasi, András Pál, Bálint Seli, Zsófia Marianna Szabó, Róbert Szakáts, Krisztián Vida

AI总结:

基于多波段测光数据,研究SN 2019vxm的光谱能量分布、热光度、有效温度和光球半径的演化,揭示其被光学厚星周介质包围、激波与光球解耦、以及星周尘埃再增亮等特征,表明前身星经历剧烈质量损失。

摘要:

IIn型超新星的多样性很大程度上由其爆炸所进入的星周介质(CSM)的性质驱动。我们利用覆盖紫外、光学和近红外波长的多色测光数据,包括超过650天的光学和1500天的红外覆盖,研究了SN 2019vxm的时间演化,这是一颗属于长持续IIn型事件的相互作用超新星。光谱能量分布和热光度以及光球的有效温度和半径的演化表明,超新星最初被光学厚的CSM包围,该CSM被冲击抛射物的正向激波加热并向外推。爆炸后约80-100天,正向激波和光球解耦,我们观察到H复合前沿的光球在现在变薄的CSM内后退。近红外测量揭示了SN 2019vxm周围星周尘埃的长期、缓慢冷却的发射,以及爆炸后约一年发生的红外再增亮,我们初步将其识别为外部CSM区域的信号。我们发现,由于移动的光球以及从光学厚到部分薄的内CSM的转变,对爆炸及随后抛射物与CSM相互作用的建模以推断前身星和CSM质量面临困难。尽管如此,推断出的高质量和极高的质量损失率表明,前身星是一颗经历剧烈前超新星质量损失的大质量恒星。

英文摘要:

The diversity of Type IIn supernovae is largely driven by the properties of the circumstellar material (CSM) they explode into. We examine the temporal evolution of SN 2019vxm, an interacting supernova that belongs to the class of long-lasting Type IIn events, using multicolor photometry spanning the ultraviolet, optical and near-infrared wavelengths, including over 650 days of optical and 1500 days of IR coverage. The evolution of the spectral energy distribution and bolometric luminosity, as well as the effective temperature and radius of the photosphere, indicates that the supernova was initially surrounded by an optically thick CSM, which was heated and pushed outward by the forward shock of the impacting ejecta. About 80-100 days after the explosion the forward shock and the photosphere decouples, and we observe the receding photosphere of the H-recombination front within the now thinned CSM. Near-IR measurements reveal long-lasting, slowly cooling emission from circumstellar dust around SN 2019vxm and an IR rebrightening about one year after explosion, which we tentatively identify as a signature of an outer CSM region. We find that due to the moving photosphere and the transition from optically thick to partially thin inner CSM, modeling the explosion and subsequent interaction of the ejecta with the CSM to infer progenitor and CSM masses faces difficulties. Nevertheless, the inferred high masses and extremely high mass-loss rates point to a massive progenitor undergoing intense pre-supernova mass loss.

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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