HD 89345：一颗由K2观测到的宿主凌星温 Saturn 大小行星的明亮振荡星
地球与行星天体物理
2018-06-13 v1 太阳与恒星天体物理
摘要
我们报告HD 89345b（K2-234b；EPIC 248777106b）的发现与表征，这是一颗绕略演化恒星运行的Saturn大小行星。HD 89345是一颗亮星（ mag），由K2任务以一分钟时间采样观测，展现类太阳振荡。我们开展星震学以确定恒星参数，得质量与半径分别为 与 。基于推断年龄 及混合模未探测到，该星似最近离开主序。该星宿主一颗“温Saturn”（~天，）。用FIES、HARPS与HARPS-N光谱仪进行的径向速度跟进观测显示行星质量为 。数据亦显示行星轨道偏心（）。对恒星振荡频率旋转分裂的探究未就恒星倾角给出结论性证据。我们进一步获取Rossiter-McLaughlin观测，得恒星自转轴与轨道面夹角的宽后验。该行星似遵从其他亚Saturn行星在行星质量与多体性、轨道偏心率及恒星金属性上已观测到的相同模式。
引用
@article{arxiv.1805.01860,
title = {HD 89345: a bright oscillating star hosting a transiting warm Saturn-sized planet observed by K2},
author = {V. Van Eylen and F. Dai and S. Mathur and D. Gandolfi and S. Albrecht and M. Fridlund and R. A. García and E. Guenther and M. Hjorth and A. B. Justesen and J. Livingston and M. N. Lund and F. Pérez Hernández and J. Prieto-Arranz and C. Regulo and L. Bugnet and M. E. Everett and T. Hirano and D. Nespral and G. Nowak and E. Palle and V. Silva Aguirre and T. Trifonov and J. N. Winn and O. Barragán and P. G. Beck and W. J. Chaplin and W. D. Cochran and S. Csizmadia and H. Deeg and M. Endl and P. Heeren and S. Grziwa and A. P. Hatzes and D. Hidalgo and J. Korth and S. Mathis and P. Montañes Rodriguez and N. Narita and M. Patzold and C. M. Persson and F. Rodler and A. M. S. Smith},
journal= {arXiv preprint arXiv:1805.01860},
year = {2018}
}
备注
Submitted to MNRAS on 23 February 2018, accepted for publication, 4 May 2018