具有长期径向速度趋势的中等质量巨星的高对比度成像
地球与行星天体物理
2016-07-20 v2 太阳与恒星天体物理
摘要
一个针对中等质量巨星的径向速度(RV)巡天已在Okayama Astrophysical Observatory (OAO)运行超过十年。OAO巡天揭示一些巨星显示长期线性RV加速(RV趋势)，表明存在外围伴星。直接成像观测可帮助澄清是什么天体产生这些RV趋势。我们呈现使用Subaru Telescope和HiCIAO相机对六颗具有长期RV趋势的中等质量巨星的高对比度成像观测结果。我们探测到共动伴星： Hya B ()、HD 5608 B ()和HD 109272 B ()。对于剩余目标( Dra、18 Del和HD 14067)我们排除在投影分离1arcsec-7arcsec处质量大于30-60 的伴星。我们检查这些直接成像伴星或未确认的长周期伴星是否能解释围绕六颗巨星观测到的RV趋势。我们发现Kozai机制可以解释内行星 Dra b、HD 5608 b和HD 14067 b的高偏心率。
引用
@article{arxiv.1603.02017,
title = {High-Contrast Imaging of Intermediate-Mass Giants with Long-Term Radial Velocity Trends},
author = {Tsuguru Ryu and Bun'ei Sato and Masayuki Kuzuhara and Norio Narita and Yasuhiro H. Takahashi and Taichi Uyama and Tomoyuki Kudo and Nobuhiko Kusakabe and Jun Hashimoto and Masashi Omiya and Hiroki Harakawa and Lyu Abe and Hiroyasu Ando and Wolfgang Brandner and Timothy D. Brandt and Joseph C. Carson and Thayne Currie and Sebastian Egner and Markus Feldt and Miwa Goto and Carol A. Grady and Olivier Guyon and Yutaka Hayano and Masahiko Hayashi and Saeko S. Hayashi and Krzysztof G. Hełminiak and Thomas Henning and Klaus W. Hodapp and Shigeru Ida and Miki Ishii and Yoichi Itoh and Masanori Iye and Hideyuki Izumiura and Markus Janson and Eiji Kambe and Ryo Kandori and Gillian R. Knapp and Eiichiro Kokubo and Jungmi Kwon and Taro Matsuo and Satoshi Mayama and Michael W. McElwain and Kyle Mede and Shoken Miyama and Jun-Ichi Morino and Amaya Moro-Martin and Tetsuo Nishimura and Tae-Soo Pyo and Eugene Serabyn and Takuya Suenaga and Hiroshi Suto and Ryuji Suzuki and Michihiro Takami and Naruhisa Takato and Yoichi Takeda and Hiroshi Terada and Christian Thalmann and Edwin L. Turner and Makoto Watanabe and John Wisniewski and Toru Yamada and Michitoshi Yoshida and Hideki Takami and Tomonori Usuda and Motohide Tamura},
journal= {arXiv preprint arXiv:1603.02017},
year = {2016}
}
备注
33 pases, 9 figures, accepted to ApJ