A Substellar Companion to Pleiades HII 3441
Abstract
We find a new substellar companion to the Pleiades member star, Pleiades HII 3441, using the Subaru telescope with adaptive optics. The discovery is made as part of the high-contrast imaging survey to search for planetary-mass and substellar companions in the Pleiades and young moving groups. The companion has a projected separation of 0".49 +/- 0".02 (66 +/- 2 AU) and a mass of 68 +/- 5 M_J based on three observations in the J-, H-, and K_S-band. The spectral type is estimated to be M7 (~2700 K), and thus no methane absorption is detected in the H band. Our Pleiades observations result in the detection of two substellar companions including one previously reported among 20 observed Pleiades stars, and indicate that the fraction of substellar companions in the Pleiades is about 10.0 +26.1/-8.8 %. This is consistent with multiplicity studies of both the Pleiades stars and other open clusters.
Keywords
Cite
@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}
}
Comments
Main text (14 pages, 4 figures, 4 tables), and Supplementary data (8 pages, 3 tables). Accepted for Publications of Astronomical Society of Japan