系外行星Kepler-8b的发现与Rossiter-McLaughlin效应
地球与行星天体物理
2015-05-14 v1
摘要
我们报告了由NASA Kepler任务识别出的凌日行星Kepler-8b的发现及其Rossiter-McLaughlin效应。Kepler测光数据与Keck-HIRES视向速度得出了这颗绕F8IV亚巨星宿主恒星运行的行星的半径和质量。该行星半径为RP = 1.419 RJ，质量为MP = 0.60 MJ，得出密度为0.26 g cm^-3，属于已知密度最低的行星之列。轨道周期P = 3.523天，轨道半长轴为0.0483+0.0006/-0.0012 AU。该恒星具有较大的自转投影速度v sin i（10.5 +/- 0.7 km s^-1）且相对较暗（V = 13.89 mag），这两个性质都不利于精确的多普勒测量。视向速度确实存在较大噪声（弥散为30 m s^-1），但表现出的周期和相位与测光数据暗示的行星一致。我们可靠地探测到了Rossiter-McLaughlin效应，证实了该行星的存在并确立其轨道为顺行轨道。我们测得行星投影轨道轴与恒星投影自转轴之间的夹角为lambda = -26.9 +/- 4.6 deg，表明行星轨道存在中等倾角。对Kepler大样本凌日行星的Rossiter-McLaughlin测量，将为总体上热木星的自转-轨道取向真实分布提供统计上稳健的度量。
引用
@article{arxiv.1001.0416,
title = {Discovery and Rossiter-McLaughlin Effect of Exoplanet Kepler-8b},
author = {Jon M. Jenkins and William J. Borucki and David G. Koch and Geoffrey W. Marcy and William D. Cochran and Gibor Basri and Natalie M. Batalha and Lars A. Buchhave and Tim M. Brown and Douglas A. Caldwell and Edward W. Dunham and Michael Endl and Debra A. Fischer and Thomas N. Gautier and John C. Geary and Ronald L. Gilliland and Steve B. Howell and Howard Isaacson and John Asher Johnson and David W. Latham and Jack J. Lissauer and David G. Monet and Jason F. Rowe and Dimitar D. Sasselov and William F. Welsh and Andrew W. Howard and Phillip MacQueen and Hema Chandrasekaran and Joseph D. Twicken and Stephen T. Bryson and Elisa V. Quintana and Bruce D. Clarke and Jie Li and Christopher Allen and Peter Tenenbaum and Hayley Wu and Soren Meibom and Todd C. Klaus and Christopher K. Middour and Miles T. Cote and Sean McCauliff and Forrest R. Girouard and Jay P. Gunter and Bill Wohler and Jennifer R. Hall and Khadeejah Ibrahim and AKM Kamal Uddin and Michael S. Wu and Paresh A. Bhavsar and Jeffrey Van Cleve and David L. Pletcher and Jessie A. Dotson and Michael R. Haas},
journal= {arXiv preprint arXiv:1001.0416},
year = {2015}
}
备注
26 pages, 8 figures, 2 tables; In preparation for submission to the Astrophysical Journal