SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b
SPIN–ORBIT ALIGNMENT FOR THREE TRANSITING HOT JUPITERS: WASP-103b, WASP-87b, and WASP-66b
复制标题
DOI：
10.3847/0004-637x/823/1/29
复制
发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
B. Addison;C. Tinney;Duncan J. Wright;D. Bayliss
中科院分区：
文献类型：
--
作者：
B. Addison;C. Tinney;Duncan J. Wright;D. Bayliss
我们已经测量了天空投影的三个凌日热彗星，WASP-103 b，WASP-87 b，和WASP-66 b的自旋轨道排列，使用Rossiter-McLaughlin效应的光谱测量，与CYCLOPS 2光纤束系统的UCLES光谱仪在英澳望远镜。WASP-103 b、WASP-87 b和WASP-66 b的自旋轨道角度分别为λ = 3° ± 33°、λ = −8° ± 11°和λ = −4° ± 22°，这表明这三颗行星的轨道可能与它们的主星星的自旋轴几乎一致。WASP-103是一个特别有趣的系统，因为它的轨道距离仅比其宿主星星的洛希半径大20%，而且行星可能会经历强烈的潮汐效应。WASP-87和WASP-66是热的（Teff = 6450 ± 120 K和Teff = 6600 ± 150 K）中F恒星，使它们与大多数在高密度轨道上拥有行星的恒星相似。WASP-103 b和WASP-66 b的中等自旋轨道失调与我们的数据一致，但极轨道和逆行轨道对这些系统不有利。
We have measured the sky-projected spin–orbit alignments for three transiting hot Jupiters, WASP-103b, WASP-87b, and WASP-66b, using spectroscopic measurements of the Rossiter–McLaughlin effect, with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin–orbit angles of λ = 3° ± 33°, λ = −8° ± 11°, and λ = −4° ± 22° for WASP-103b, WASP-87b, and WASP-66b, respectively, suggest that these three planets are likely on nearly aligned orbits with respect to their host star’s spin axis. WASP-103 is a particularly interesting system as its orbital distance is only 20% larger than its host star’s Roche radius and the planet likely experiences strong tidal effects. WASP-87 and WASP-66 are hot (Teff = 6450 ± 120 K and Teff = 6600 ± 150 K, respectively) mid-F stars, making them similar to the majority of stars hosting planets on high-obliquity orbits. Moderate spin–orbit misalignments for WASP-103b and WASP-66b are consistent with our data, but polar and retrograde orbits are not favored for these systems.