昴星团 HII 3441 的次恒星伴星
地球与行星天体物理
2016-09-28 v1 太阳与恒星天体物理
摘要
我们使用配备自适应光学的 Subaru 望远镜发现了一颗昴星团成员星 Pleiades HII 3441 的新次恒星伴星。该发现是旨在搜寻昴星团和年轻移动星群中行星质量与次恒星伴星的高对比度成像巡天的一部分。基于 J、H 和 K_S 波段的三次观测，该伴星的投影分离为 0".49 +/- 0".02 (66 +/- 2 AU)，质量为 68 +/- 5 M_J。其光谱型估计为 M7 (~2700 K)，因此在 H 波段未检测到甲烷吸收。我们对昴星团的观测共探测到两颗次恒星伴星（包括此前报告过的一颗），涉及 20 颗受观测的昴星团成员星，并表明昴星团中次恒星伴星的占比约为 10.0 +26.1/-8.8 %。这与昴星团恒星及其他疏散星团的多重性研究相一致。
引用
@article{arxiv.1608.01780,
title = {A Substellar Companion to Pleiades HII 3441},
author = {Mihoko Konishi and Taro Matsuo and Kodai Yamamoto and Matthias Samland and Jun Sudo and Hiroshi Shibai and Yoichi Itoh and Misato Fukagawa and Takahiro Sumi and Tomoyuki Kudo and Jun Hashimoto and Masayuki Kuzuhara and Nobuhiko Kusakabe and Lyu Abe and Eiji Akiyama and Wolfgang Brandner and Timothy D. Brandt and Joseph C. Carson and Markus Feldt and Miwa Goto and Carol A. Grady and Olivier Guyon and Yutaka Hayano and Masahiko Hayashi and Saeko S. Hayashi and Thomas Henning and Klaus W. Hodapp and Miki Ishii and Masanori Iye and Markus Janson and Ryo Kandori and Gillian R. Knapp and Jungmi Kwon and Michael W. Mcelwain and Kyle Mede and Shoken Miyama and Jun-Ichi Morino and Amaya Moro-Mart'in and Tetsuo Nishimura and Daehyeon Oh and Tae-Soo Pyo and Eugene Serabyn and Joshua E. Schlieder and Takuya Suenaga and Hiroshi Suto and Ryuji Suzuki and Yasuhiro H. Takahashi and Michihiro Takami and Naruhisa Takato and Hiroshi Terada and Christian Thalmann and Edwin L. Turner and Makoto Watanabe and John P. Wisniewski and Toru Yamada and Hideki Takami and Tomonori Usuda and Motohide Tamura},
journal= {arXiv preprint arXiv:1608.01780},
year = {2016}
}
备注
Main text (14 pages, 4 figures, 4 tables), and Supplementary data (8 pages, 3 tables). Accepted for Publications of Astronomical Society of Japan