期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 822, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8205/822/1/L1
关键词
brown dwarfs
资金
- National Aeronautics and Space Administration
- National Science Foundation
- ESO Progam [179.A-2010]
We present WISEA J114724.10-204021.3, a young, low-mass, high-probability member of the TW Hya association (TWA). WISEA J114724.10-204021.3 was discovered based on its red AllWISE color (W1 - W2 = 0.63 mag) and extremely red 2MASS J - K-S color (>2.64 mag), the latter of which is confirmed with near-infrared photometry from the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey (J - K-S = 2.57 +/- 0.03). Follow-up near-infrared spectroscopy shows a spectral type of L7 +/- 1 as well as several spectroscopic indicators of youth. These include a peaked H-band shape and a steeper K-band slope, traits typically attributed to low surface gravity. The sky position, proper motion, and distance estimates of WISEA J114724.10-204021.3 are all consistent with membership in the similar to 10 Myr old TWA. Using the age of the TWA and evolutionary models, we estimate the mass of WISEA J114724.10-204021.3 to be 5-13 M-Jup, making it one of the youngest and lowest-mass free-floating objects yet discovered in the Solar neighborhood.
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