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• W2091200716 abstract "We have obtained projected rotation velocities (vsini) of a sample of 19 ultracool dwarfs with spectral types in the interval M6.5-T8 using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope. Among our targets there are two young brown dwarfs, two likely field stars, and fifteen likely brown dwarfs (30-72 Mjup) of the solar neighborhood. Our results indicate that the T-type dwarfs are fast rotators in marked contrast to M-type stars. We have derived vsini velocities between <15 and 40 km/s for them, and have found no clear evidence for T dwarfs rotating strongly faster than L dwarfs. However, there is a hint for an increasing lower envelope on moving from mid-M to the L spectral types in the vsini-spectral type diagram that was previously reported in the literature; our vsini results extend it to even cooler types. Assuming that field brown dwarfs have a size of 0.08-0.1 Rsol, we can place an upper limit of 12.5 h on the equatorial rotation period of T-type brown dwarfs. In addition, we have compared our vsini measurements to spectroscopic rotational velocities of very young brown dwarfs of similar mass available in the literature. The comparison, although model-dependent, suggests that brown dwarfs lose some angular momentum during their contraction; however, their spin down time seems to be significantly longer than that of solar-type to early-M stars." @default.
• W2091200716 created "2016-06-24" @default.
• W2091200716 creator A5011776660 @default.
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• W2091200716 date "2006-08-20" @default.
• W2091200716 modified "2023-09-28" @default.
• W2091200716 title "Spectroscopic Rotational Velocities of Brown Dwarfs" @default.
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• W2091200716 doi "https://doi.org/10.1086/505484" @default.
• W2091200716 hasPublicationYear "2006" @default.
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