A Young Brown Dwarf Companion to DH Tauri

• Published in: The Astrophysical journal Vol. 620; no. 2; pp. 984 - 993
• Main Authors: Itoh, Yoichi, Hayashi, Masahiko, Tamura, Motohide, Tsuji, Takashi, Oasa, Yumiko, Fukagawa, Misato, Hayashi, Saeko S, Naoi, Takahiro, Ishii, Miki, Mayama, Satoshi, Morino, Jun-ichi, Yamashita, Takuya, Pyo, Tae-Soo, Nishikawa, Takayuki, Usuda, Tomonori, Murakawa, Koji, Suto, Hiroshi, Oya, Shin, Takato, Naruhisa, Ando, Hiroyasu, Miyama, Shoken M, Kobayashi, Naoto, Kaifu, Norio
• Format: Journal Article
• Language: English
• Published: Chicago, IL IOP Publishing 20-02-2005; University of Chicago Press
• Subjects: stars: individual (DH Tauri); stars: pre-main-sequence -techniques: high angular resolution; Low-mass stars; Pre-main-sequence stars; Brown dwarf stars; stars: low-mass, brown dwarfs
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1086/427086

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 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 a 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 T sub(eff) = 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 H-R diagram gives its mass of 30M sub(J) 50M sub(J).