Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-10
Astrophys.J. 644 (2006) L75-L78
Astronomy and Astrophysics
Astrophysics
accepted by ApJ Letters
Scientific paper
10.1086/505343
The nearby brown dwarf LP 944-20 has been monitored for radial velocity variability at optical and near-infrared wavelengths using the VLT/UVES and the Keck/NIRSPEC spectrographs, respectively. The UVES radial velocity data obtained over 14 nights spanning a baseline of 841 days shows significant variability with an amplitude of 3.5 km s$^{-1}$. The periodogram analysis of the UVES data indicates a possible period between 2.5 hours and 3.7 hours, which is likely due to the rotation of the brown dwarf. However, the NIRSPEC data obtained over 6 nights shows an rms dispersion of only 0.36 km s$^{-1}$ and do not follow the periodic trend. These results indicate that the variability seen with UVES is likely to be due to rotationally modulated inhomogeneous surface features. We suggest that future planet searches around very low-mass stars and brown dwarfs using radial velocities will be better conducted in the near-infrared than in the optical.
Bouy Herve
Guenther Eike E.
Martin Eduardo L.
Wainscoat Richard
Zapatero Osorio Maria R.
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