Kelu-1 AB - A possible brown dwarf triple system (2008)
Stumpf, M. B., Brandner, W., Henning, Th., Bouy, H., Koehler, R., Hormuth, F., ...
We have monitored the benchmark L dwarf binary Kelu-1AB over the past 3 years to derive improved spectral types and luminosities for the individual components. The astrometric measurements enable us...
An IPHAS-based search for accreting very low-mass objects using VO tools (2008)
Valdivielso, L., Martin, E. L., Bouy, H., Solano, E., Drew, J. E., Greimel, R., ...
The main goal of this paper is to prove that accreting very low-mass stars and brown dwarfs can be identified in IPHAS, a Halpha emission survey of the northern Milky Way.Full exploitation of the...
Binarity at the L/T brown dwarf transition (2008)
Goldman, B., Bouy, H., Osorio, M. R. Zapatero, Stumpf, M. B., Brandner, W., Henning, T.
Current atmospheric models cannot reproduce some of the characteristics of the transition between the L dwarfs with cloudy atmospheres and the T dwarfs with dust-depleted photospheres. It has been...
A deep look into the cores of young clusters I. sigma-Orionis (2008)
Bouy, H., Huelamo, N., Martin, E. L., Marchis, F., Navascues, D. Barrado Y, Kolb, J., ...
Nearby young clusters are privileged places to study the star formation history. Over the last decade, the sigma-Orionis cluster has been a prime location for the study of young very low mass stars,...
Modjaz, Maryam, Li, W., Butler, N., Chornock, R., Perley, D., Blondin, S., ...
(ABRIDGED) We present extensive early photometric (UBVRr'Ii'JHKs) and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D as well as X-ray data on the associated X-ray transient...
Bouy, H., Huelamo, N., Pinte, C., Olofsson, J., Navascues, D. Barrado Y, Martin, E. L., ...
In order to improve our understanding of substellar formation, we have performed a compositional and structural study of a brown dwarf disk. We present the result of photometric, spectroscopic and...
Follow-up observations of binary ultra-cool dwarfs (2008)
Bouy, H., Martin, E. L., Brandner, W., Forveille, T., Delfosse, X., Huelamo, N., ...
Astrometric observations of resolved binaries provide estimates of orbital periods and will eventually lead to measurement of dynamical masses. Only a few very low mass star and brown dwarf masses...
Multi-Conjugate Adaptive Optics images of the Trapezium Cluster (2007)
Bouy, H., Kolb, J., Marchetti, E., Martin, E. L., Huelamo, N., Navascues, D. Barrado Y
Multi-Conjugate Adaptive Optics (MCAO) combines the advantages of standard adaptive optics, which provides high contrast and high spatial resolution, and of wide field ~1' imaging. Up to recently,...
Space Velocities of L- and T-type Dwarfs (2007)
Osorio, M. R. Zapatero, Martin, E. L., Bejar, V. J. S., Bouy, H., Deshpande, R., Wainscoat, R. J.
(Abridged) 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...
The young, wide and very low mass visual binary LOri167 (2007)
Navascues, D. Barrado Y, Bayo, A., Morales-Calderon, M., Huelamo, N., Stauffer, J. R., Bouy, H.
We look for wide, faint companions around members of the 5 Myr Lambda Orionis open cluster. We used optical, near-infrared, and Spitzer/IRAC photometry. We report the discovery of a very wide very...
Discs of planetary-mass objects in s Orionis (2007)
Zapatero Osorio, M. R., Caballero, J. A., Béjar, V. J. S., Rebolo, R., Bihain, G., ...
Aims.We searched for infrared flux excesses of planetary-mass candidates in the sigma Orionis cluster (~3 Myr, ~350 pc). Methods: Using IJHKs data from the literature and the [3.6], [4.5], [5.8], and...
Janson, M., Brandner, W., Lenzen, R., Close, L., Nielsen, E., Hartung, M., ...
We present resolved NACO photometry of the close binary AB Dor B in H- and Ks-band. AB Dor B is itself known to be a wide binary companion to
A multiwavelength radial velocity search for planets around the brown dwarf LP 944-20 (2006)
Martin, E. L., Guenther, E., Osorio, M. R. Zapatero, Bouy, H., Wainscoat, R.
The nearby brown dwarf LP 944-20 has been monitored for radial velocity variability at optical and near-infrared wavelengths using the VLT/UVES and the Keck/NIRSPEC spectrographs, respectively. The...
Resolved Hubble Space spectroscopy of ultracool binary systems (2006)
Martin, E. L., Brandner, W., Bouy, H., Basri, G., Davis, J., Deshpande, R., ...
Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the \emph{Hubble Space Telescope} (HST), we have obtained spatially resolved spectra of 20 ultracool dwarfs. 18...
Spectroscopic rotational velocities of brown dwarfs (2006)
Osorio, M. R. Zapatero, Martin, E. L., Bouy, H., Tata, R., Deshpande, R., Wainscoat, R.
We have obtained projected rotation velocities (vsini) of a sample of 19 ultracool dwarfs with spectral types in the interval M6.5-T8 using high-resolution, near-infrared spectra obtained with...
Resolved Hubble space spectroscopy of ultracool binary systems (2006)
Martín, E. L., Brandner, W., Bouy, H., Basri, G., Davis, J., Deshpande, R., ...
Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of...
Bouy, H., Moraux, E., Bouvier, J., Brandner, W., Martín, E. L., Allard, F., ...
We present the results of a high-resolution imaging survey for brown dwarf binaries in the Pleiades open cluster. The observations were carried out with the Advanced Camera for Surveys (Pavlovsky and...
Bouy, H., Martín, E. L., Brandner, W., Zapatero-Osorio, M. R., Béjar, V. J. S., Schirmer, M., ...
Aims.Properties of multiplicity, such as the multiplicity frequency, the distribution of mass ratios and periods, provide important informations on the formation processes at work. Studying these...
Bouy, H., Martin, E. L., Brandner, W., Zapatero-Osorio, M. R., Bejar, V. J. S., Schirmer, M., ...
We report the initial results of a VLT/NACO high spatial resolution imaging survey for multiple systems among 58 M-type members of the nearby Upper Scorpius OB association. Nine pairs with...
A Hubble Space Telescope ACS Search for Brown Dwarf Binaries in the Pleiades Open Cluster (2005)
Bouy, H., Moraux, E., Bouvier, J., Brandner, W., Martin, E. L., Allard, F., ...
We present the results of a high-resolution imaging survey for brown dwarf binaries in the Pleiades open cluster. The observations were carried out with the Advance Camera for Surveys onboard the...
First determination of the orbit of a binary L-dwarf (2005)
Bouy, H., Duchêne, G., Köhler, R., Brandner, W., Bouvier, J., Martin, E., ...
Bouy, H., Martín, E. L., Brandner, W., Bouvier, J.
We present results showing that the multiple system DENIS-P J020529.0-115925 is likely to be a triple system of very low mass stars and brown dwarfs. The secondary of this previously known binary...
Ultracool dwarf binaries (2005)
Bouy, H., Martín, E., Brandner, W., Bouvier, J.
We review here the multiplicity properties of ultracool dwarfs (spectral type later than M6) observed in three different environments and at three different ages: in the field, where the objects are...
Bouy, H., Martin, E. L., Brandner, W., Bouvier, J.
We present results showing that the multiple system DENIS-P J020529.0-115925 is likely to be a triple system of brown dwarfs. The secondary of this previously known binary system shows a clear...
First determination of the dynamical mass of a binary L dwarf (2004)
Bouy, H., Duchene, G., Koehler, R., Brandner, W., Bouvier, J., Martin, E. L., ...
We present here the results of astrometric, photometric and spectroscopic observations leading to the determination of the orbit and dynamical masses of the binary L dwarf 2MASSW J0746425+2000321....
X-ray Detections of Two Young Bona-Fide Brown Dwarfs (2004)
I report here the detection of two bona-fide brown dwarfs by XMM-Newton: [GY92] 141 in the rho-Ophiuchus star forming region and DENIS-P J155601-233809 in the Upper Scorpius OB association. The two...
A young binary Brown Dwarf in the R-CrA star formation region (2004)
Bouy, H., Brandner, W., Martin, E. L., Delfosse, X., Allard, F., Baraffe, I., ...
We present imaging and spectroscopic observations with HST (WFPC2, ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM8 ultra-cool dwarf DENIS-P J185950.9-370632, located in the R-CrA region....
First determination of the dynamical mass of a binary L dwarf (2004)
Bouy, H., Duchêne, G., Köhler, R., Brandner, W., Bouvier, J., Martin, E. L., ...
A young binary brown dwarf in the R-CrA star formation region (2004)
Bouy, H., Brandner, W., Martin, E. L., Delfosse, X., Allard, F., Baraffe, I., ...
Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547 (2004)
Brandner, W., Martin, E. L., Bouy, H., Köhler, R., Delfosse, X., Basri, G., ...
First determination of the dynamical mass of a binary L dwarf (2004)
Bouy, H., Duchêne, G., Köhler, R., Brandner, W., Bouvier, J., Martín, E. L., ...
We present here the results of astrometric, photometric and spectroscopic observations leading to the determination of the orbit and dynamical masses of the binary L dwarf 2MASSW J0746425+2000321....
A young binary brown dwarf in the R-CrA star forming region (2004)
Bouy, H., Brandner, W., Martin, E., Delfosse, X., Allard, F., Baraffe, I., ...
Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547 (2004)
Brandner, W., Martín, E. L., Bouy, H., Köhler, R., Delfosse, X., Basri, G., ...
We present astrometric monitoring data of the binary brown dwarf DENIS-P J1228.2-1547. The data have been obtained with the Hubble Space Telescope over a time span of 5.5 yr, and confirm that DENIS-P...
First NACO observations of the Brown Dwarf LHS 2397aB (2003)
Masciadri, E., Brandner, W., Bouy, H., Lenzen, R., Lagrange, A. M., Lacombe, F.
Observations of the standard late type M8 star LHS 2397aA were obtained at the ESO-VLT 8m telescope ``Yepun'' using the NAOS/CONICA Adaptive Optics facility. The observations were taken during the...
First NACO observations of the brown dwarf LHS 2397aB (2003)
Masciadri, E., Brandner, W., Bouy, H., Lenzen, R., Lagrange, A. M., Lacombe, F.
Observations of the standard late type M8 star LHS 2397aA were obtained at the ESO-VLT 8 m telescope ``Yepun'' using the NAOS/CONICA Adaptive Optics facility. The observations were taken during the...