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arXiv 0907.3677astro-ph.GA
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附近太阳类似物周围的碎片盘

Debris discs around nearby Solar analogues

J. S. Greaves, M. C. Wyatt, G. Bryden

摘要:

报道了对类太阳恒星周围碎片盘的无偏搜索。在850 $\umu$ m波长下搜寻了13颗距离为12-15秒差距的G矮星,并确认了HD 30495周围的圆盘。估计尘埃质量为0.008 M $_{\oplus}$,其他恒星的平均盘净极限为$\la 0.0025$ M $_{\oplus}$。结果表明,在类太阳恒星周围并没有大量的冷盘- HD 30495是一个明亮的而不是异常冷的盘,可能属于几百万年前的更大尘埃亮度的人口。只要典型的彗星带在大小上与太阳系相当,类太阳恒星的远红外和毫米测量数据就可以很好地用稳态或搅拌模型拟合。

英文摘要:

An unbiased search for debris discs around nearby Sun-like stars is reported. Thirteen G-dwarfs at 12-15 parsecs distance were searched at 850 $\umu$m wavelength, and a disc is confirmed around HD 30495. The estimated dust mass is 0.008 M$_{\oplus}$ with a net limit $\la 0.0025$ M$_{\oplus}$ for the average disc of the other stars. The results suggest there is not a large missed population of substantial cold discs around Sun-like stars -- HD 30495 is a bright rather than unusually cool disc, and may belong to a few hundred Myr-old population of greater dust luminosity. The far-infared and millimetre survey data for Sun-like stars are well fitted by either steady state or stirred models, provided that typical comet belts are comparable in size to that in the Solar System.

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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