Lack of close-in, massive planets of main-sequence A-type stars from Kepler
Lack of close-in, massive planets of main-sequence A-type stars from Kepler
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DOI：
10.1093/mnras/stz2232
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发表时间：
2019-08
影响因子：
4.8
通讯作者：
S. Sabotta;P. Kabáth;J. Korth;E. Guenther;Daniel Dupkala;S. Grziwa;T. Klocova;M. Skarka
中科院分区：
文献类型：
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作者：
S. Sabotta;P. Kabáth;J. Korth;E. Guenther;Daniel Dupkala;S. Grziwa;T. Klocova;M. Skarka
一些行星形成和演化的理论预测，中等质量恒星比类太阳恒星拥有更多的热彗星，其他人则得出这样的结论：这样的物体非常罕见。通过确定这些行星的频率，我们可以测试这些理论。根据开普勒光变曲线的分析，大约8%的中等质量恒星可能有一个近距离的亚恒星伴星。这表明这类物体出现的频率很高。到目前为止，还没有令人满意的证据或测试这一假设。我们研究了先前报道的开普勒领域的主序星A型恒星周围的166颗行星候选者的样本。我们选择了其中的六个，我们获得了广泛的长期径向速度测量与阿尔弗雷德Jensch 2米望远镜在陶滕堡和Perek 2米望远镜在Ondalvejov。我们推导出候选行星质量的上限。我们表明，我们能够检测到这种行星与我们的望远镜和他们的仪器使用的例子MASCARA-1 B。通过寻找凌日管道Extrans，我们确认在这166颗恒星的光变曲线中没有一颗来自类似彗星的行星的凌日事件。我们进一步确定，在开普勒样本中的A型恒星的近距离，大质量行星的发生率的上限是0.75%左右。我们认为，目前几乎没有证据表明，一个非常高的频率近距离，大质量行星的中等质量恒星。
Some theories of planet formation and evolution predict that intermediate-mass stars host more hot Jupiters than Sun-like stars, others reach the conclusion that such objects are very rare. By determining the frequencies of those planets we can test those theories. Based on the analysis of Kepler light curves it has been suggested that about 8 per cent of the intermediate-mass stars could have a close-in substellar companion. This would indicate a very high frequency of such objects. Up to now, there was no satisfactory proof or test of this hypothesis. We studied a previously reported sample of 166 planet candidates around main-sequence A-type stars in the Kepler field. We selected six of them for which we obtained extensive long-term radial velocity measurements with the Alfred Jensch 2-m telescope in Tautenburg and the Perek 2-m telescope in Ondřejov. We derive upper limits of the masses of the planet candidates. We show that we are able to detect this kind of planet with our telescopes and their instrumentation using the example of MASCARA-1 b. With the transit finding pipeline Extrans we confirm that there is no single transit event from a Jupiter-like planet in the light curves of those 166 stars. We furthermore determine that the upper limit for the occurrence rate of close-in, massive planets for A-type stars in the Kepler sample is around 0.75 per cent. We argue that there is currently little evidence for a very high frequency of close-in, massive planets of intermediate-mass stars.