137 citations · 861 across the 27 of their papers we have counts for
7 papers · 1 filter
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…
The substellar mass function in sigma Orionis. II. Optical, near-infrared and IRAC/Spitzer photometry of young cluster brown dwarfs and planetary-mass objects
J. A. Caballero, V. J. S. Béjar, R. Rebolo +8
We investigate the mass function in the substellar domain down to a few Jupiter masses in the young sigma Orionis open cluster (3+/-2 Ma, d = 360^+70_-60 pc). We have performed a d…
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…
The pre-main sequence spectroscopic binary UZ Tau East: improved orbital parameters and accretion phase dependence
Eduardo L. Martín, Antonio Magazzù, Xavier Delfosse +1
We present radial-velocity measurements obtained using high- and intermediate-resolution spectroscopic observations of the classical T Tauri star UZ Tau East obtained from 1994 to…
An L0 dwarf companion in the brown dwarf desert, at 30 AU
T. Forveille, D. Ségransan, P. Delorme +8
We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far in our adaptive opti…
The sigma Orionis substellar population
David Barrado y Navascués, Víctor J. S. Béjar, Reinhard Mundt +4
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…