Optical spectroscopy of isolated planetary mass objects in the sigma Orionis cluster

Details Optical spectroscopy of isolated planetary mass objects in the sigma Orionis cluster Optical spectroscopy of isolated planetary mass objects in the sigma Orionis cluster

2001-08-15

arxiv.org/abs/astro-ph/0108249v1

Astron.Astrophys.377:L9-L13,2001

Astronomy and Astrophysics

Astrophysics

Astronomy and Astrophysics, accepted

Scientific paper

10.1051/0004-6361:20011152

We have obtained low resolution optical spectra of 15 isolated planetary mass objects (IPMOs) in the sigma Orionis cluster, and derived spectral types by comparison with nearby M and L dwarfs. The spectral types are in the range late M - mid L, in agreement with our expectations based on colors and magnitudes for bona fide members. Therefore, most of these objects have masses below the deuterium burning limit. About 2/3 show H(alpha) in emission at our spectral resolution. From our spectroscopic and photometric data, we infer that three IPMOs in this sample may be binaries with components of similar masses. These results confirm that the substellar mass function of the sigma Orionis cluster, in the form dN/dM, keeps rising in the planetary domain.

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