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arXiv 1306.2265astro-ph.SRastro-ph.HE
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激波和喷出物质量:新星V1723 Aql的射电观测

Shocks and Ejecta Mass: Radio Observations of Nova V1723 Aql

Jennifer H. S. Weston, Jennifer L. Sokoloski, Yong Zheng, Laura Chomiuk, Amy Mioduszewski, Koji Mukai, Michael P. Rupen, Miriam I. Krauss, Nirupam Roy, Thomas Nelson

摘要:

新星的射电光变曲线在几个月到几年的时间里上升和下降,这使得我们可以详细观察新星壳的演变。然而,由新星爆发的射电模型确定的主要参数--喷出物的质量--似乎经常超出理论预期一个数量级。随着卡尔G. Jansky甚大阵列(VLA),新的观测可以测试喷出物质量估计所依据的假设。对经典新星V1723 Aql的早期观测显示,射电通量密度意外地迅速上升,射电光变曲线在上升到射电极大值时出现明显的凸起,这与球形喷出物在单个离散事件中喷出的简单模型不一致。这种最初的碰撞似乎表明在弹射壳的外部区域存在冲击物质,随着时间的推移,冲击的辐射逐渐减弱。我们探讨这种排放的可能来源及其与新星质量损失历史的关系。无线电频谱的演变也揭示了密度分布,喷射壳的质量和喷射物的其他属性。这些观测结果是迄今为止对任何经典新星进行的最完整、最长期的多波长射电观测之一。

英文摘要:

The radio light curves of novae rise and fall over the course of months to years, allowing for detailed observations of the evolution of the nova shell. However, the main parameter determined by radio models of nova explosions - the mass of the ejecta - often seems to exceed theoretical expectations by an order of magnitude. With the recent technological improvements on the Karl G. Jansky Very Large Array (VLA), new observations can test the assumptions upon which ejecta mass estimates are based. Early observations of the classical nova V1723 Aql showed an unexpectedly rapid rise in radio flux density and a distinct bump in the radio light curve on the rise to radio maximum, which is inconsistent with the simple model of spherical ejecta expelled in a single discrete event. This initial bump appears to indicate the presence of shocked material in the outer region of the ejected shell, with the emission from the shocks fading over time. We explore possible origins for this emission and its relation to the mass loss history of the nova. The evolution of the radio spectrum also reveals the density profile, the mass of the ejected shell, and other properties of the ejecta. These observations comprise one of the most complete, longterm set of multi-wavelength radio observations for any classical nova to date.

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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