A Possible Brown Dwarf Companion to the White Dwarf GD 1400
A Possible Brown Dwarf Companion to the White Dwarf GD 1400
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DOI：
10.1086/423919
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发表时间：
2004-07
期刊：
影响因子：
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通讯作者：
J. Farihi;M. Christopher
中科院分区：
文献类型：
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作者：
J. Farihi;M. Christopher
据报道，DA白矮星GD1400有一颗尚未解决的、可能是L的矮星伴星。这将是已知的第二个这样的系统，在L矮星原型GD165B被确定为白矮星的伴星17年后被发现。对已有的白矮星主星参数的测光观测和模型预测表明，GD1400B的J-K≳为2.0，MK=12.13mag。如果正确，这将把GD 1400B置于L6光谱类型，这将是白矮星已知的亮度最低的未演化伴星，因此它肯定是棕矮星。然而，低分辨率的Keck NIRSpec 2.1-2.4μm谱可能与已知的L矮星不一致。在解决双星或测量三角视差之前，分类中的不确定性将一直存在。
An unresolved, likely L dwarf companion to the DA white dwarf GD 1400 is reported. This would be only the second such system known, discovered 17 years after the prototype L dwarf, GD 165B, was determined to be a companion to a white dwarf. Photometric observations and model-predicted of the well-studied white dwarf primary stellar parameters indicate that GD 1400B has J - K ≳ 2.0 and MK = 12.13 mag. If correct, this would place GD 1400B at spectral type L6, and it would be the lowest-luminosity unevolved companion known to a white dwarf and thus a definite brown dwarf. However, a low-resolution Keck NIRSPEC 2.1–2.4 μm spectrum may not be consistent with known L dwarfs. Uncertainties in classification will remain until the binary is resolved or a trigonometric parallax is measured.