217 citations · 1.9k across the 37 of their papers we have counts for
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Chemical abundances of late-type pre-main sequence stars in the -Orionis cluster
J. I. González Hernández, J. A. Caballero, R. Rebolo +4
The young -Orionis cluster is an important location for understanding the formation and evolution of stars, brown dwarfs, and planetary-mass objects. Its metallicity, although b…
S Ori J053825.4-024241: A Classical T Tauri-like object at the substellar boundary
J. A. Caballero, E. L. Martín, M. R. Zapatero Osorio +4
We present a spectrophotometric analysis of S Ori J053825.4-024241, a candidate member close to the substellar boundary of the young (1-8 Myr), nearby (~360 pc) sigma Orionis star…
A Methane Isolated Planetary Mass Object in Orion
M. R. Zapatero Osorio, V. J. S. Bejar, E. L. Martin +5
We report on the discovery of a free-floating methane dwarf toward the direction of the young star cluster sigma Orionis. Based on the object's far-red optical and near-infrared ph…
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…
The First L-type Brown Dwarf in the Pleiades
E. L. Martin, G. Basri, M. R. Zapatero Osorio +2
We have obtained low-resolution optical spectra of three faint brown dwarf candidates in the Pleiades open cluster. The objects observed are Roque 12 (I=18.5), Roque 5 (I=19.7) and…
A brown dwarf candidate in the Praesepe Open Cluster
A. Magazzu, R. Rebolo, M. R. Zapatero Osorio +2
We present optical and infrared observations of RPr1, a faint (I = 21.01) and very red object (I - K = 4.57) discovered in a deep CCD survey, covering an area of 800 square arcmin…
New Brown Dwarfs in the Pleiades Cluster
M. R. Zapatero Osorio, R. Rebolo, E. L. Martin +5
We present intermediate and low resolution optical spectroscopy (650-915 nm) of seven faint, very red objects (20 > I >= 17.8, I-Z >= 0.5) discovered in a CCD-based IZ survey cover…