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arXiv 1503.02073astro-ph.EP
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邻近超级地球宿主星周围的柯伊伯带结构

Kuiper belt structure around nearby super-Earth host stars

Grant M. Kennedy, Luca Matrà, Maxime Marmier, Jane S. Greaves, Mark C. Wyatt, Geoffrey Bryden, Wayne Holland, Christophe Lovis, Brenda C. Matthews, Francesco Pe… 展开作者

Grant M. Kennedy, Luca Matrà, Maxime Marmier, Jane S. Greaves, Mark C. Wyatt, Geoffrey Bryden, Wayne Holland, Christophe Lovis, Brenda C. Matthews, Francesco Pepe, Bruce Sibthorpe, Stéphane Udry

摘要:

我们提出了新的观测柯伊伯带类似物HD 38858和HD 20794,主机的超地球质量的行星在1 au。作为附近四颗G型恒星(HD 69830和61 Vir)中的两颗,它们构成了低质量行星和碎片盘亮度之间可能相关性的基础,这些系统特别令人感兴趣。HD 38858周围的圆盘用Herschel很好地解决了,我们限制了圆盘的几何形状和径向结构。我们还提出了一个可能的JCMT亚毫米连续检测的光盘和CO J=2-1的上限。HD 20794周围的星盘比HD 38858和61 Vir周围的星盘要暗得多,似乎与赫歇尔的关系不大,并且被限制为比HD 38858和61 Vir周围的星盘更少延伸。我们还对最近用近红外干涉测量法在HD 20794周围探测到的热尘埃的径向位置进行了限制。我们目前的HARPS上限看不见的行星在这四个系统中,排除了额外的超级地球在几个天文单位,和土星质量的行星在10天文单位。我们认为,在三个系统的柯伊伯带类似物(HD 69830只有一个温暖的尘埃检测)的光盘结构,得出的结论是,61 Vir和HD 38858有更大的径向盘的范围比HD 20794。我们推测,更大的宽度与更大的最小行星质量(10-20 $M_\oplus$ vs. 3-5 $M_\oplus$)有关,这是由类似于太阳系分散盘的偏心微行星群引起的。我们讨论替代方案和可能的手段来区分它们。

英文摘要:

We present new observations of the Kuiper belt analogues around HD 38858 and HD 20794, hosts of super-Earth mass planets within 1 au. As two of the four nearby G-type stars (with HD 69830 and 61 Vir) that form the basis of a possible correlation between low-mass planets and debris disc brightness, these systems are of particular interest. The disc around HD 38858 is well resolved with Herschel and we constrain the disc geometry and radial structure. We also present a probable JCMT sub-mm continuum detection of the disc and a CO J=2-1 upper limit. The disc around HD 20794 is much fainter and appears marginally resolved with Herschel, and is constrained to be less extended than the discs around 61 Vir and HD 38858. We also set limits on the radial location of hot dust recently detected around HD 20794 with near-IR interferometry. We present HARPS upper limits on unseen planets in these four systems, ruling out additional super-Earths within a few au, and Saturn-mass planets within 10 au. We consider the disc structure in the three systems with Kuiper belt analogues (HD 69830 has only a warm dust detection), concluding that 61 Vir and HD 38858 have greater radial disc extent than HD 20794. We speculate that the greater width is related to the greater minimum planet masses (10-20 $M_\oplus$ vs. 3-5 $M_\oplus$), arising from an eccentric planetesimal population analogous to the Solar System's scattered disc. We discuss alternative scenarios and possible means to distinguish among them.

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