A HOT JUPITER ORBITING THE 1.7 M☉ SUBGIANT HD 102956

A HOT JUPITER ORBITING THE 1.7 M☉ SUBGIANT HD 102956
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绕 1.7 M☉ 次巨星 HD 102956 运行的热木星

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发表时间:
2010
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通讯作者:
J. Crepp
J. Crepp
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作者:
J. Johnson;B. Bowler;A. Howard;G. Henry;G. Marcy;H. Isaacson;J. Brewer;D. Fischer;T. Morton;J. Crepp

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我们报告在环绕1.68 M☉亚巨星HD 102956的6.4950天的轨道上发现了一颗巨大的行星。这颗行星的半长轴a = 0.081 AU,最小质量MPsin i =0.96 MJup。HD 102956是已知拥有热木星的质量最大的恒星,它的行星是已知的第三颗在0.6 AU范围内运行的质量大于1.5 M☉的恒星。根据我们的137个亚巨星的样本,我们发现0.5%-2.3%的a型恒星拥有一个近距离行星(a < 0.1 AU), MPsin i >1 MJup,与类太阳恒星的热木星现象一致。因此,中等质量恒星周围0.1 AU < a < 1.0 AU的行星的稀少可能是“周期谷”的夸张版本,这是类太阳恒星周围行星的特征。
We report the detection of a giant planet in a 6.4950 day orbit around the 1.68 M☉ subgiant HD 102956. The planet has a semimajor axis a = 0.081 AU and a minimum mass MPsin i =0.96 MJup. HD 102956 is the most massive star known to harbor a hot Jupiter, and its planet is only the third known to orbit within 0.6 AU of a star more massive than 1.5 M☉. Based on our sample of 137 subgiants with M⋆>1.45 M☉, we find that 0.5%–2.3% of A-type stars harbor a close-in planet (a < 0.1 AU) with MPsin i > 1 MJup, consistent with hot-Jupiter occurrence for Sun-like stars. Thus, the paucity of planets with 0.1 AU < a < 1.0 AU around intermediate-mass stars may be an exaggerated version of the “period valley” that is characteristic of planets around Sun-like stars.