Clues to Substellar Formation: Rotation and the Low-Mass End of the Initial Mass Function

Details Clues to Substellar Formation: Rotation and the Low-Mass End of the Initial Mass Function Clues to Substellar Formation: Rotation and the Low-Mass End of the Initial Mass Function

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.292..673z&link_type=abstract

Astrophysics and Space Science, v. 292, Issue 1, p. 673-679 (2004).

Astronomy and Astrophysics

Astrophysics

3

Young Star Clusters, Brown Dwarfs, Planetary-Mass Objects, Angular Momentum Evolution

Scientific paper

We have monitored S Ori 45, a young, low-mass (20 M j up) brown dwarf of the σ Orionis cluster (˜3 Myr, 352 pc), using optical and near-infrared filters. S Ori 45 (spectral type M8.5) is found to be multi-periodic with a dominant modulation at 2.5 3.5 h, and a short modulation at about 46 min. We ascribe the longer of these modulations to a rotation period. After comparing these results with observations of more massive cluster brown dwarfs and field brown dwarfs, we conclude that substellar objects present rotational and angular momentum evolution.

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