Possible planets around A stars

被引：19

作者：

Balona, L. A. ^{[1
]}

机构：

[1] S African Astron Observ, ZA-7935 Cape Town, South Africa

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 441卷 / 04期

基金：

新加坡国家研究基金会;

关键词：

stars: activity; stars: oscillations; planetary systems; stars: rotation; EXTRASOLAR PLANETS; ROTATING STARS; GIANT PLANETS; TIDAL DISSIPATION; HOT JUPITERS; LIGHT CURVES; KEPLER; MIGRATION; ORBIT; OSCILLATIONS;

D O I：

10.1093/mnras/stu822

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Kepler photometry of A stars shows that a considerable fraction (about 19 per cent) have a peculiar feature in the periodogram. This feature consists of a broad peak, thought to be due to differential rotation in a spotted star, and a sharp peak at slightly higher frequency. The pattern clearly involves some widespread stellar property and the sharp peak implies a strictly coherent periodicity. We investigate the possibility that the periodicity is due to rotation, pulsation or an orbital effect. We argue that neither rotation nor pulsation can provide a suitable, testable, explanation. We suggest that the sharp feature could be due to a planet in synchronous orbit around the rapidly rotating, spotted A star, not necessarily in transit. Spectroscopic observations of sufficient precision are required to falsify this hypothesis.

引用

页码：3543 / 3549

页数：7

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