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arXiv 1209.6155astro-ph.SRastro-ph.HE
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19世纪船底座伊塔星爆发的一个模型:类似缩小的I型In超新星的CSM相互作用

A Model for the 19th Century Eruption of Eta Carinae: CSM Interaction Like a Scaled-Down Type IIn Supernova

Nathan Smith

摘要:

本文提出了一个简单的19世纪海山二号爆发的模型,它包括两个组成部分:(1)强风(MdotM=0.33 Msun/yr; v=200 km/s),吹了30年,其次是(2)1844年1 e50 erg的爆炸。快速喷出物和CSM之间的碰撞导致了1844年底观测到的亮度增加,随后是持续10-15年的持续高光度阶段,与历史光变曲线相匹配。出射光度由CSM相互作用提供动力,类似于发光的IIn型超新星的过程,除了爆炸能量低10倍和速度较慢(导致更长的持续时间和更低的出射光度)。这样的爆炸性事件为光变曲线的演化提供了一个自然的解释,但也解释了侏儒星云的一些令人困惑的属性:(1)总辐射能和总动能的大致均分;(2)Homunculus的双层壳结构;(3)薄的后掠壳导致的表观单龄和Hubble流;(4)HST图像中极瓣的复杂斑驳外观,由Raleigh-Taylor或Vishniac不稳定性引起,(5)有效和快速的尘埃形成,如在IIn型超新星中所见,以及(6)快速(5000公里/秒)的物质,产生于离开密集的CSM时的前向激波的加速。原则上,双极形状已经在早期的相互作用风的研究中得到了解释,除了这里的CSM相互作用只发生了10年,产生了一个薄壳,所产生的结构然后冻结在膨胀的双极星云中。这种自洽的图片有许多其他喷发瞬变的影响,其中许多也可能是供电CSM相互作用。

英文摘要:

This paper proposes a simple model for the 19th century eruption of Eta Carinae that consists of two components: (1) a strong wind (MdotM=0.33 Msun/yr; v=200 km/s), blowing for 30 years, followed by (2) a 1e50 erg explosion in 1844. The ensuing collision between the fast ejecta and the CSM causes an increase in brightness observed at the end of 1844, followed by a sustained high-luminosity phase lasting for 10-15 years that matches the historical light curve. The emergent luminosity is powered by CSM interaction, analogous to the process in luminous Type IIn supernovae, except with 10 times lower explosion energy and at slower speeds (causing a longer duration and lower emergent luminosity). Such an explosive event provides a natural explanation for the light curve evolution, but also accounts for a number of puzzling attributes of the Homunculus nebula: (1) rough equipartition of total radiated and kinetic energy, (2) the double-shell structure of the Homunculus, (3) the apparent single age and Hubble-like flow resulting from the thin swept-up shell, (4) the complex mottled appearance of the polar lobes in HST images, arising from Raleigh-Taylor or Vishniac instabilities, (5) efficient and rapid dust formation, as seen in Type IIn supernovae, and (6) the fast (5000 km/s) material outside the Homunculus, arising from the acceleration of the forward shock upon exiting the dense CSM. In principle, the bipolar shape has already been explained in earlier studies of interacting winds, except that here the CSM interaction occurs over only 10 years, producing a thin shell with the resulting structures then frozen-in to the expanding bipolar nebula. This self-consistent picture has a number of implications for other eruptive transients, many of which may also be powered by CSM interaction.

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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