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Optical spectroscopy of isolated planetary mass objects in the sigma Orionis cluster
D. Barrado-y-Navascués, M. R. Zapatero-Osorio, V. J. S. Béjar +5
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 a…
Keck NIRC Observations of Planetary-mass Candidate Members in the sigma Orionis Open Cluster
E. L. Martin, M. R. Zapatero Osorio, D. Barrado y Navascues +2
We present K-band photometry and low-resolution near-infrared spectroscopy from 1.44 to 2.45 micron of isolated planetary-mass candidate members in the sigma Orionis cluster found…
The Substellar Mass Function in sigma Orionis
V. J. S. Bejar, E. L. Martin, M. R. Zapatero Osorio +7
We combine results from imaging searches for substellar objects in the sigma Orionis cluster and follow-up photometric and spectroscopic observations to derive a census of the brow…