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AbstractAbstract
[en] In a recent search for unusually red L and T dwarfs, we identified 2MASS J11193254–1137466 as a likely young L7 dwarf and potential member of the TW Hydrae association. We present spectra that confirm the youth of this object. We also measure a radial velocity of 8.5 ± 3.3 km s−1 that, together with the sky position, proper motion, and photometric distance, results in a 92% probability of membership in the TW Hydrae association, with a calibrated field contamination probability of 0.0005% using the BANYAN II tool. Using the age of TW Hydrae and the luminosity of 2MASS J11193254–1137466, we estimate its mass to be 4.3–7.6 . It is the lowest-mass and nearest isolated member of TW Hydrae at a kinematic distance of 28.9 ± 3.6 pc, and the second-brightest isolated <10 object discovered to date.
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Available from http://dx.doi.org/10.3847/2041-8205/821/1/L15; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Astrophysical Journal Letters; ISSN 2041-8205;
; v. 821(1); [5 p.]

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