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Discovery of Young, Isolated Planetary Mass Objects in the σ Orionis Star Cluster
We present the discovery by optical and near-infrared imaging of an extremely red, low-luminosity population of isolated objects in the young, nearby stellar cluster around the multiple, massive starExpand
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The Substellar Mass Function in σ Orionis
We combine results from imaging searches for substellar objects in the σ Orionis cluster and follow-up photometric and spectroscopic observations to derive a census of the brown dwarf population in aExpand
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Space Velocities of L- and T-type Dwarfs
We have obtained radial velocities of a sample of 18 ultracool dwarfs (M6.5-T8) using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope. We have confirmed thatExpand
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A Methane isolated planetary mass object in orion
We report on the discovery of a free-floating methane dwarf toward the direction of the young star cluster σ Ori. Based on the object's far-red, optical, and near-infrared photometry andExpand
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A Search for Very Low Mass Stars and Brown Dwarfs in the Young σ Orionis Cluster
We present a CCD-based photometric survey covering 870 arcmin2 in a young stellar cluster around the young multiple star σ Orionis. Our survey-limiting R, I, and Z magnitudes are 23.2, 21.8, andExpand
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Discovery of a Wide Companion near the Deuterium-burning Mass Limit in the Upper Scorpius Association
We present the discovery of a companion near the deuterium-burning mass limit located at a very wide distance, at an angular separation of -->4.6'' ± 0.1'' (projected distance of ~ 670 AU) fromExpand
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Optical Linear Polarization of Late M and L Type Dwarfs
We report on the linear polarimetric observations in the Johnson I-band filter of 44 ultracool dwarfs with spectral types between M6 and L7.5, corresponding to effective temperatures in the rangeExpand
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Lithium and halpha in stars and brown dwarfs of sigma orionis
We present intermediate- and low-resolution optical spectra around Hα and Li I λ6708 A for a sample of 25 low mass stars and 2 brown dwarfs with confirmed membership in the pre-main sequence stellarExpand
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The sigma Orionis substellar population. VLT/FORS spectroscopy and 2MASS photometry
VLT/FORS spectroscopy and 2MASS near-infrared photometry, together with previously known data, have been used to establish the membership and the properties of a sample of low-mass candidate membersExpand
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Pleiades low-mass brown dwarfs: the cluster L dwarf sequence
Aims. We present a search for low-mass brown dwarfs in the Pleiades open cluster. The identification of Pleiades members fainter and cooler than those currently known allows us to constrainExpand
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