论文标题
与浓缩咖啡和苔丝一起重新访问WASP-47
Revisiting WASP-47 with ESPRESSO and TESS
论文作者
论文摘要
WASP-47托管着一个非凡的行星系统，其中包含一个热的木星（WASP-47 B; P = 4.159天），内部超级地球（WASP-47 E; P = 0.7896天），一个近距离的Neptune（WASP-47 D; WASP-47 D; p = 9.031天），pplan days and long ofer grand days planse giant Giant Giant pplane（p Plan）（p Plan）（p Plan）（p Plane）（p Plane）（p Plane）（p Plane）（p Plane）48.48。我们使用新的苔丝光度法来完善系统中过境行星的轨道晶体，尤其是热木星WASP-47 B，为此，我们找到了一个相当于过境时间17.4分钟的更新。我们报告了WASP-47的意式浓缩仪光谱仪的新径向速度测量值，我们用来完善WASP-47 D和WASP-47 E的质量，并具有高节奏的观察策略，旨在将重点放在超级地球上的WASP-47 E上。我们检测到K2光度法中的定期调制，该调制对应于32.5 $ \ pm $ 3.9天恒星旋转，并在我们的浓缩咖啡数据中找到与此旋转期一致的进一步的恒星活动信号。对于WASP-47 E，我们的质量为6.77 $ \ pm $ 0.57 m $ _ {\ oplus} $，大量密度为6.29 $ \ pm $ 0.60 gcm $^{ - 3} $，使WASP-47 e成为第二大含量的wasp-47 e。 WASP-47 E的质量和半径与行星系统的外在配置相结合，表明WASP-47系统是通过与具有多个小行星或更典型的孤立热jupiter的系统不同的机制形成的。
WASP-47 hosts a remarkable planetary system containing a hot Jupiter (WASP-47 b; P = 4.159 days) with an inner super-Earth (WASP-47 e; P = 0.7896 days), a close-orbiting outer Neptune (WASP-47 d; P = 9.031 days), and a long period giant planet (WASP-47 c; P = 588.4 days). We use the new TESS photometry to refine the orbital ephemerides of the transiting planets in the system, particularly the hot Jupiter WASP-47 b, for which we find an update equating to a 17.4 min shift in the transit time. We report new radial velocity measurements from the ESPRESSO spectrograph for WASP-47, which we use to refine the masses of WASP-47 d and WASP-47 e, with a high cadence observing strategy aimed to focus on the super-Earth WASP-47 e. We detect a periodic modulation in the K2 photometry that corresponds to a 32.5$\pm$3.9 day stellar rotation, and find further stellar activity signals in our ESPRESSO data consistent with this rotation period. For WASP-47 e we measure a mass of 6.77$\pm$0.57 M$_{\oplus}$ and a bulk density of 6.29$\pm$0.60 gcm$^{-3}$, giving WASP-47 e the second most precisely measured density to date of any super-Earth. The mass and radius of WASP-47 e, combined with the exotic configuration of the planetary system, suggest the WASP-47 system formed through a mechanism different to systems with multiple small planets or more typical isolated hot Jupiters.
