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arXiv 2106.09025astro-ph.EPastro-ph.SR
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富含气体的白矮星行星碎片盘中的碰撞

Collisions in a gas-rich white dwarf planetary debris disc

Andrew Swan, Scott J. Kenyon, Jay Farihi, Erik Dennihy, Boris T. Gänsicke, J. J. Hermes, Carl Melis, Ted von Hippel

摘要:

WD 0145+234是一颗白矮星,它正在从行星物质的环星盘中吸积金属。自2018年以来,它表现出3-5微米通量的大幅持续增长。后续的斯皮策测光显示,到2019年底,圆盘的发射已经开始减少。叠加在亮度下降的随机增亮事件表明,在拱星固体碰撞演化过程中释放的尘埃。一个简单的模型被用来表明观测结果确实与正在进行的碰撞相一致。在这个系统中已经探测到了罕见的星周气体发射谱线,支持了白矮星碎片盘作为碰撞气体和尘埃产生场所的新图像。

英文摘要:

WD 0145+234 is a white dwarf that is accreting metals from a circumstellar disc of planetary material. It has exhibited a substantial and sustained increase in 3-5 micron flux since 2018. Follow-up Spitzer photometry reveals that emission from the disc had begun to decrease by late 2019. Stochastic brightening events superimposed on the decline in brightness suggest the liberation of dust during collisional evolution of the circumstellar solids. A simple model is used to show that the observations are indeed consistent with ongoing collisions. Rare emission lines from circumstellar gas have been detected at this system, supporting the emerging picture of white dwarf debris discs as sites of collisional gas and dust production.

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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