Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association (2009)
Bouy, Herve, Martin, Eduardo L.
Proper motion measurements of the cool and ultracool populations in the Upper Scorpius OB association are crucial to confirm membership and to identify possible run-away objects. We cross-match...
The transmission spectrum of Earth through lunar eclipse observations (2009)
Palle, Enric, Osorio, Maria Rosa Zapatero, Montanes-Rodriguez, Pilar, Barrena, Rafael, Martin, Eduardo L.
Of the 342 planets discovered so far orbiting other stars, 58 "transit" the stellar disk, meaning that they can be detected by a periodic decrease in the starlight flux. The light from the star...
First Confirmed Detection of a Bipolar Molecular Outflow from a Young Brown Dwarf (2008)
Phan-Bao, Ngoc, Riaz, Basmah, Lee, Chin-Fei, Tang, Ya-Wen, Ho, Paul T. P., Martin, Eduardo L., ...
Studying the earliest stages in the birth of stars is crucial for understanding how they form. Brown dwarfs with masses between that of stars and planets are not massive enough to maintain stable...
IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery (2008)
Vink, Jorick S., Drew, Janet E., Steeghs, Danny, Wright, Nick J., Martin, Eduardo L., Gaensicke, Boris T., ...
We report on the discovery of over 50 strong Halpha emitting objects towards the large OB association Cyg OB2 and the HII region DR 15 on its southern periphery. This was achieved using the INT...
Irwin, Jonathan, Aigrain, Suzanne, Hodgkin, Simon, Stassun, Keivan G., Hebb, Leslie, Irwin, Mike, ...
We report the discovery of a low-mass (0.26 +/- 0.02, 0.15 +/- 0.01 Msol) pre-main-sequence eclipsing binary with a 5.3 day orbital period. JW 380 was detected as part of a high-cadence time-resolved...
A mid-infrared study of very low mass stars and brown dwarfs in Upper Scorpius (2006)
Bouy, Herve, Huelamo, Nuria, Martin, Eduardo L., Navascues, David Barrado Y, Sterzik, Michael, Pantin, Eric
We report the results of mid-IR observations with VISIR at the VLT of 10 ultracool dwarfs members of the nearby Upper Scorpius OB association in four filters ranging between 8.59 (PAH1) to 12.8...
Ge, Jian, Van Eyken, Julian, Mahadevan, Suvrath, DeWitt, Curtis, Kane, Stephen R., Cohen, Roger, ...
We report the detection of the first extrasolar planet, ET-1 (HD 102195b), using the Exoplanet Tracker (ET), a new generation Doppler instrument. The planet orbits HD 102195, a young star with solar...
Siegler, Nick, Close, Laird M., Cruz, Kelle L., Martin, Eduardo L., Reid, I. Neill
We present updated results of a high-resolution, magnitude limited (Ks20 AU) very low-mass (M_tot3 AU and mass ratios q>0.6. Within these instrumental sensitivities, these results support the overall...
Binaries among Ultra-cool Dwarfs and Brown Dwarfs (2004)
Brandner, Wolfgang, Bouy, Herve, Martin, Eduardo L., Umbreit, Stefan
Observations of brown dwarfs provide important feedback on theories of atmospheres and inner structure of substellar objects. Brown dwarf binary systems furthermore offer the unique opportunity to...
On the potassium-rotation connection in late-type Alpha Persei stars (2004)
Martin, Eduardo L., Magazzu, Antonio, Lopez, Ramon J. Garcia, Randich, Sofia, Navascues, David Barrado Y
We present measurements of the \ion{K}{i} $\lambda 7699$ line from spectra of 19 late-type members of the $\alpha$Persei cluster obtained with the Intermediate Dispersion Spectrograph at the Isaac...
Martin, Eduardo L., Delfosse, Xavier, Guieu, Sylvain
We present low-resolution (R=900) optical (576.1--1,051.1 nm) spectroscopic observations of 40 candidate very low-mass members in the Upper Scorpius OB association. These objects were selected using...
Navascues, David Barrado Y, Martin, Eduardo L.
We have compiled and studied photometric and spectroscopic data published in the literature of several star forming regions and young open clusters (Orion, Taurus, IC348, Sco-Cen Complex, Chamaeleon...
Spectroscopic estimate of surface gravity for a planetary member in the Sigma Ori cluster (2003)
Martin, Eduardo L., Osorio, Maria Rosa Zapatero
We present intermediate-resolution (R=1500) near-infrared spectroscopy from 1.17 $\mu$m to 1.37 $\mu$m of the spectral type T planetary candidate member in the \sigori cluster S Ori 70 reported by...
Multiplicity of Nearby Free-floating Ultra-cool Dwarfs: a HST-WFPC2 search for companions (2003)
Bouy, Herve, Brandner, Wolfgang, Martin, Eduardo L., Delfosse, Xavier, Allard, France, Basri, Gibor
We present HST/WFPC2 observations of a sample of 134 ultra-cool objects (spectral types later than M7) coming from the DENIS, 2MASS and SDSS surveys, with distances estimated to range from 7 pc to...
An HST/WFPC2 Survey for Brown Dwarf Binaries in the alpha Per and the Pleiades Open Clusters (2003)
Martin, Eduardo L., Navascues, David Barrado Y, Baraffe, Isabelle, Bouy, Herve, Dahm, Scott
We present the results of a high-resolution imaging survey for brown dwarf (BD) binaries in two open clusters. The observations were carried out with WFPC2 onboard HST. Our sample consists of 8 BD...
A New Multiple Stellar System in the Solar Neighborhood (2003)
Adaptive optics corrected images obtained with the CIAO instrument at the Subaru 8.2-meter telescope show the presence of two subarsecond companions to the nearby (d=19.3 pc) young star GJ 900, which...
XMM-Newton observations of the nearby brown dwarf LP 944-20 (2002)
Martin, Eduardo L., Bouy, Herve
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=16.736$\pm$0.081), but it was not...
Discovery of a very cool object with extraordinarily strong H(alpha) emission (2002)
Navascues, David Barrado Y, Osorio, Maria Rosa Zapatero, Martin, Eduardo L., Bejar, Victor J. S., Rebolo, Rafael, Mundt, Reinhard
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 substellar candidate...
Lithium Abundances in Wide Binaries with Solar-Type Twin Components (2002)
Martin, Eduardo L., Basri, Gibor, Pavlenko, Yakiv, Lyubchik, Yuri
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 components....
Discovery of a Methane Dwarf from the IfA-Deep Survey (2002)
Liu, Michael C., Wainscoat, Richard, Martin, Eduardo L., Barris, Brian, Tonry, John
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 z'-band imaging,...
Probing the Substellar Regime with SIRTF (2000)
Martin, Eduardo L., Brandner, Wolfgang, Jewitt, David, Simon, Theodore, Wainscoat, Richard, Marley, Mark, ...
One of the main scientific drivers of the Space InfraRed Telescope Facility (SIRTF) is the search for brown dwarfs and extrasolar superplanets. We discuss observational strategies for identification...
A Survey for Low-mass Stars and Brown Dwarfs in the Upper-Scorpius OB Association (2000)
Ardila, David R., Martin, Eduardo L., Basri, Gibor
The Upper-Scorpius association is the OB association nearest to the Sun (145 pc). Its young age (5 Myr) makes it an ideal place to search for low-mass stars and brown dwarfs, as these objects should...
Basri, Gibor, Mohanty, Subhanjoy, Allard, France, Hauschildt, Peter H., Delfosse, Xavier, Martin, Eduardo L., ...
We present Keck HIRES spectra of 6 late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures to the objects using detailed atmospheric models and fine analysis of the alkali...
Doyle, Laurance R., Deeg, Hans J., Kozhevnikov, Valerij P., Oetiker, Brian, Martin, Eduardo L., Blue, J. Ellen, ...
A lightcurve of the eclipsing binary CM Draconis has been analyzed for the presence of transits of planets of size >= 2.5 Earth-radii (Re), with periods of 60 days or less, and in co-planar orbits...
Search for X-ray emission from bona-fide and candidate brown dwarfs (1998)
Neuhaeuser, Ralph, Briceno, Cesar, Comeron, Fernando, Hearty, Thomas, Martin, Eduardo L., ...
Following the recent classification of the X-ray detected object V410 x-ray 3 with a young brown dwarf candidate (Briceno et al. 1998) and the identification of an X-ray source in Chamaeleon as young...
The Mass and Age of Very Low Mass Members of the Open Cluster Alpha Persei (1998)
Basri, Gibor, Martin, Eduardo L.
We present spectroscopic optical and photometric infrared observations of 12 faint candidate members of the young open cluster Alpha Persei found by Prosser (1994). Keck HIRES echelle spectra provide...