A Young Brown Dwarf Companion to DH Tauri
/ Authors
Y. Itoh, M. Hayashi, M. Tamura, T. Tsuji, Y. Oasa, M. Fukagawa, S. Hayashi, T. Naoi, M. Ishii, S. Mayama
and 13 more authors
J. Morino, T. Yamashita, T. Pyo, Takayuki Nishikawa, T. Usuda, K. Murakawa, H. Suto, S. Oya, N. Takato, H. Ando, S. Miyama, N. Kobayashi, N. Kaifu
/ 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 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 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 H-R diagram gives its mass of 30MJ-50MJ.
Journal: The Astrophysical Journal
DOI: 10.1086/427086