文章基本信息

标题：Discovery of a Nearby Young Brown Dwarf Disk
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作者：Maria C.Schutte ; Kellen D.Lawson ; John P.Wisniewski 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：160
期号：4
页码：1-10
DOI：10.3847/1538-3881/abaccd
语种：English
出版社：American Institute of Physics
摘要：We report the discovery of the youngest brown dwarf with a disk at 102 pc from the Sun, WISEA J120037.79−784508.3 (W1200−7845), via the Disk Detective citizen science project. We establish that W1200−7845 is located in the Myr old ε Cha association. Its spectral energy distribution (SED) exhibits clear evidence of an infrared (IR) excess, indicative of the presence of a warm circumstellar disk. Modeling this warm disk, we find the data are best fit using a power-law description with a slope α = −0.94, which suggests that it is a young, Class II type disk. Using a single blackbody disk fit, we find and . The near-IR spectrum of W1200−7845 matches a spectral type of M6.0 0.5, which corresponds to a low surface gravity object, and lacks distinctive signatures of strong Paβ or Brγ accretion. Both our SED fitting and spectral analysis indicate that the source is cool (Teff = 2784–2850 K), with a mass of 42–58 MJup, well within the brown dwarf regime. The proximity of this young brown dwarf disk makes the system an ideal benchmark for investigating the formation and early evolution of brown dwarfs.