A Young Brown Dwarf Companion to DH Tauri
Abstract
We present the detection of a young brown dwarf companion DH Tau B associated with the classical T Tauri star DH Tau. Near-infrared coronagraphic observations with CIAO on the Subaru Telescope have revealed DH Tau B with H = \~15 mag located at 2.3" (330 AU) away from the primary DH Tau A. Comparing its position with a Hubble Space Telescope archive image, we confirmed that DH Tau A and B share the common proper motion, suggesting that they are physically associated with each other. The near-infrared color of DH Tau B is consistent with those of young stellar objects. The near-infrared spectra of DH Tau B show deep water absorption bands, a strong K I absorption line, and a moderate Na I absorption line. We derived its effective temperature and surface gravity of Teff = 2700 -- 2800 K and log g = 4.0--4.5, respectively, by comparing the observed spectra with synthesized spectra of low-mass objects. The location of DH Tau B on the HR diagram gives its mass of 30 -- 50 M_Jupiter.
Cite
@article{arxiv.astro-ph/0411177,
title = {A Young Brown Dwarf Companion to DH Tauri},
author = {Yoichi Itoh and Masahiko Hayashi and Motohide Tamura and Takashi Tsuji and Yumiko Oasa and Misato Fukagawa and Saeko S. Hayashi and Takahiro Naoi and Miki Ishii and Satoshi Mayama and Jun-ichi Morino and Takuya Yamashita and Tae-Soo Pyo and Takayuki Nishikawa and Tomonori Usuda and Koji Murakawa and Hiroshi Suto and Shin Oya and Naruhisa Takato and Hiroyasu Ando and Shoken M. Miyama and Naoto Kobayashi and Norio Kaifu},
journal= {arXiv preprint arXiv:astro-ph/0411177},
year = {2009}
}
Comments
10 pages, 14 figures, 1 table, accepted for publication in ApJ