arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.05609astro-ph.EP
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类地行星形成时期类日恒星周围的大碰撞

Large Impacts around a Solar Analog Star in the Era of Terrestrial Planet Formation

Huan Y. A. Meng, Kate Y. L. Su, George H. Rieke, David J. Stevenson, Peter Plavchan, Wiphu Rujopakarn, Carey M. Lisse, Saran Poshyachinda, Daniel E. Reichart

摘要:

类地行星的最后组合是通过大规模的碰撞发生的,碰撞可以发射大量的尘埃云,这些尘埃云被恒星加热并在红外线下发光。我们报告的实时检测的碎片产生的影响,在类地行星区周围的一个3500万年的太阳模拟恒星。我们观察到碎片盘在3-5 μm处的显著增亮,随后在一年内衰减,盘通量具有准周期性调制。这种行为与剧烈撞击的发生是一致的,撞击产生了蒸汽,蒸汽中凝结出一层厚厚的硅酸盐小球云,碰撞将其研磨成尘埃。这些结果表明,时间域可以成为研究类地行星形成的新维度。

英文摘要:

The final assembly of terrestrial planets occurs via massive collisions, which can launch copious clouds of dust that are warmed by the star and glow in the infrared. We report the real-time detection of a debris-producing impact in the terrestrial planet zone around a 35-million year-old solar analog star. We observed a substantial brightening of the debris disk at 3-5 μm, followed by a decay over a year, with quasi-periodic modulations of the disk flux. The behavior is consistent with the occurrence of a violent impact that produced vapor out of which a thick cloud of silicate spherules condensed that were ground into dust by collisions. These results demonstrate how the time domain can become a new dimension for the study of terrestrial planet formation.

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