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

Zapatero Osorio, María Rosa; Caballero, J.; Martín, E. L.; Béjar, V. J. S.; Rebolo, R.
Bibliographical reference

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

Advertised on:
8
2004
Number of authors
5
IAC number of authors
3
Citations
3
Refereed citations
3
Description
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.