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arXiv 1211.3045astro-ph.EP
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WASP-71 b:一颗膨胀的热木星,围绕一颗演化的F8恒星运行2.9天

WASP-71b: a bloated hot Jupiter in a 2.9-day, prograde orbit around an evolved F8 star

A. M. S. Smith, D. R. Anderson, F. Bouchy, A. Collier Cameron, A. P. Doyle, A. Fumel, M. Gillon, G. Hébrard, C. Hellier, E. Jehin, M. Lendl, P. F. L. Maxted, C.… 展开作者

A. M. S. Smith, D. R. Anderson, F. Bouchy, A. Collier Cameron, A. P. Doyle, A. Fumel, M. Gillon, G. Hébrard, C. Hellier, E. Jehin, M. Lendl, P. F. L. Maxted, C. Moutou, F. Pepe, D. Pollacco, D. Queloz, A. Santerne, D. Segransan, B. Smalley, J. Southworth, A. H. M . J. Triaud, S. Udry, R. G. West

摘要:

我们报告发现的WASP过境调查的高辐射,大规模(2.242 +/- 0.080 MJup)的行星,过境一个明亮的(V = 10.6),每2.9天演化F8恒星。行星WASP-71 b比木星大(1.46 +/- 0.13 RJup),但密度较小(0.71 +/- 0.16 ρJup)。我们还报告了在运输过程中使用CORALIE光谱仪进行的光谱观测,这使我们能够对Rossiter-McLaughlin效应进行高度重要的检测。我们确定恒星自旋轴和行星轨道轴之间的天空投影角为λ = 20.1 +/- 9.7度,即系统是“对准的”,根据广泛使用的对准标准,只有当λ被测量为大于10度时,系统才被认为是未对准的,3-σ置信度。因此,WASP-71的有效温度为6059 +/- 98 K,符合之前观察到的模式,即只有温度高于6250 K的恒星才是偏离轨道的行星的宿主。然而,我们要强调的是,λ仅仅是天空投射的平行度角;我们无法确定恒星自旋轴和行星轨道轴是否沿着视线偏离。WASP-71的质量为1.56 +/- 0.07 Msun,之前的温度超过6250 K,因此过去可能会严重偏离。如果是这样的话,行星轨道已经重新调整,大概是通过潮汐与冷却恒星的对流区的相互作用。

英文摘要:

We report the discovery by the WASP transit survey of a highly-irradiated, massive (2.242 +/- 0.080 MJup) planet which transits a bright (V = 10.6), evolved F8 star every 2.9 days. The planet, WASP-71b, is larger than Jupiter (1.46 +/- 0.13 RJup), but less dense (0.71 +/- 0.16 ρJup). We also report spectroscopic observations made during transit with the CORALIE spectrograph, which allow us to make a highly-significant detection of the Rossiter-McLaughlin effect. We determine the sky-projected angle between the stellar-spin and planetary-orbit axes to be λ = 20.1 +/- 9.7 degrees, i.e. the system is 'aligned', according to the widely-used alignment criteria that systems are regarded as misaligned only when λ is measured to be greater than 10 degrees with 3-σ confidence. WASP-71, with an effective temperature of 6059 +/- 98 K, therefore fits the previously observed pattern that only stars hotter than 6250 K are host to planets in misaligned orbits. We emphasise, however, that λ is merely the sky-projected obliquity angle; we are unable to determine whether the stellar-spin and planetary-orbit axes are misaligned along the line-of-sight. With a mass of 1.56 +/- 0.07 Msun, WASP-71 was previously hotter than 6250 K, and therefore might have been significantly misaligned in the past. If so, the planetary orbit has been realigned, presumably through tidal interactions with the cooling star's growing convective zone.

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