A possible spin-orbit misalignment in the transiting eccentric planet HD 17156b

被引：42
|
作者：
Narita, Norio [1 ]
Sato, Bun'ei [2 ]
Ohshima, Osamu [3 ]
Winn, Joshua N. [4 ,5 ]
机构：
[1] Univ Tokyo, Dept Phys, Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan
[2] Tokyo Inst Technol, Global Edge Inst, Tokyo 1528550, Japan
[3] Mizushima Tech High Sch, Okayama 7100807, Japan
[4] MIT, Dept Phys, Cambridge, MA 02139 USA
[5] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
来源：
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2008年 / 60卷 / 02期
关键词：
stars : planetary; systems : individual (HD 17156); stars : rotation; techniques : photometric; techniques : radial velocities; techniques : spectroscopic;
D O I：
10.1093/pasj/60.2.L1
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on 2007 November 12 (UT). This system is of special interest because of its 21 d period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be 62 degrees +/- 25 degrees. Such a large spin-orbit misalignment, as well as the high eccentricity, could be explained as a relic of a previous gravitational interaction with other planets.
引用
收藏
页码：L1 / L5
页数：5
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