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XMM-Newton observations of the nearby brown dwarf LP 944-20
Eduardo L. Martin, Herve Bouy
The nearby (d=5.0 pc) brown dwarf LP944-20 was observed with the XMM-Newton satellite on 07 January 2001. The target was detected with the Optical Monitor (V=16.7360.081), but…
Discovery of a very cool object with extraordinarily strong H(alpha) emission
David Barrado y Navascues, Maria Rosa Zapatero Osorio, Eduardo L. Martin +3
We report on the finding of the strongest H(alpha) emission -pseudoequivalent width of 705 Angstrom- known so far in a young, late type dwarf. This object, named as SOri71, is a su…
Lithium Abundances in Wide Binaries with Solar-Type Twin Components
Eduardo L. Martin, Gibor Basri, Yakiv Pavlenko +1
We present high-resolution spectroscopic observations of the \ion{Li}{1} resonance line in a sample of 62 stars that belong to 31 common-proper motion pairs with twin F or G-type c…
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…
Discovery of a Methane Dwarf from the IfA-Deep Survey
Michael C. Liu, Richard Wainscoat, Eduardo L. Martin +2
We present the discovery of a distant methane dwarf, the first from the Institute for Astronomy (IfA) Deep Survey. The object ("IfA 0230-Z1") was identified from deep optical I and…