A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b

A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b
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系外行星动力学历史的窗口:Rossiter-McLaughlin 对 WASP-13b 和 WASP-32b 的观测

DOI:
10.1093/mnras/stu520
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发表时间:
2014
影响因子:
4.8
通讯作者:
Brothwell R
Brothwell R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brothwell R

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我们介绍了WASP-13 b和WASP-32 b的Rossiter-McLaughlin观测,并确定了行星轨道法线与恒星自转轴之间的天空投影角(λ)。WASP-13 b和WASP-32 b都有一个椭圆轨道,并且分别与测量的天空投影角一致。WASP-13和WASP-32的Teff都小于6250 K,因此,这些系统支持了这样一个总的趋势,即排列的行星系统优先被发现绕着冷的宿主星运行。对这两个系统的SuperWASP存档数据进行了Lomb-Scargle周期图分析。WASP-32系统的恒星自转周期探测具有统计学意义(置信度高于99.9%),Prot = 11.6 ± 1.0天。这一自转周期与由恒星半径R* 和vsin i计算的恒星自转周期(假设恒星倾角为Oi *= 90°)是一致的。根据确定的自转周期,恒星自转轴和行星轨道之间的真实3D角θ = 11° ± 14°。最后,我们通过计算潮汐耗散时标讨论了Teff < 6150 K的冷宿主星周围系统的排列。我们发现,潮汐耗散时间尺度短的系统优先对齐,潮汐耗散时间尺度长的系统有一个广泛的一致性。
We present Rossiter–McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (λ). WASP-13b and WASP-32b both have prograde orbits and are consistent with alignment with measured sky-projected angles ofand, respectively. Both WASP-13 and WASP-32 haveTeff< 6250 K, and therefore, these systems support the general trend that aligned planetary systems are preferentially found orbiting cool host stars. A Lomb–Scargle periodogram analysis was carried out on archival SuperWASP data for both systems. A statistically significant stellar rotation period detection (above 99.9 per cent confidence) was identified for the WASP-32 system withProt= 11.6 ± 1.0 days. This rotation period is in agreement with the predicted stellar rotation period calculated from the stellar radius,R*, andvsiniif a stellar inclination ofi*= 90° is assumed. With the determined rotation period, the true 3D angle between the stellar rotation axis and the planetary orbit, ψ, was found to be ψ = 11° ± 14°. We conclude with a discussion on the alignment of systems around cool host stars withTeff< 6150 K by calculating the tidal dissipation time-scale. We find that systems with short tidal dissipation time-scales are preferentially aligned and systems with long tidal dissipation time-scales have a broad range of obliquities.
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