A Young Brown Dwarf Companion to DH Tauri
A Young Brown Dwarf Companion to DH Tauri
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DOI：
10.1086/427086
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
Y. Itoh;M. Hayashi;M. Tamura;T. Tsuji;Y. Oasa;M. Fukagawa;S. Hayashi;T. Naoi;M. Ishii;S. Mayama;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
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文献类型：
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作者：
Y. Itoh;M. Hayashi;M. Tamura;T. Tsuji;Y. Oasa;M. Fukagawa;S. Hayashi;T. Naoi;M. Ishii;S. Mayama;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
我们提出了一个年轻的棕矮星同伴，DH头B，与经典的金牛座T星星DH头的检测。在斯巴鲁望远镜上用CIAO进行的近红外日冕观测显示，DH Tau B的H = 15等，距离主星DH Tau A 2.“3（330 Au）。将其位置与哈勃太空望远镜存档图像进行比较，我们证实DH Tau A和B有着共同的自行，这表明它们在物理上相互关联。DH Tau B的近红外颜色与年轻恒星的颜色一致。DH Tau B的近红外光谱显示出较深的水吸收带、较强的KI吸收线和中等的Na I吸收线。通过比较低质量天体的观测光谱和合成光谱，我们得到了它的有效温度Teff = 2700-2800 K，表面重力log g = 4.0-4.5。DH Tau B在H-R图上的位置给出了它的质量为30 MJ-50 MJ。
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.