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Kelu-1 AB - A possible brown dwarf triple system
M. B. Stumpf, W. Brandner, Th. Henning +5
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 meas…
A shift in Jupiter's equatorial haze distribution imaged with the Multi-Conjugate Adaptive Optics Demonstrator at the VLT
Michael H. Wong, Franck Marchis, Enrico Marchetti +4
Jupiter was imaged during the Science Demonstration of the MCAO Demonstrator (MAD) at the European Southern Observatory's UT3 Very Large Telescope unit. Io and Europa were used as…
Binarity at the L/T brown dwarf transition
B. Goldman, H. Bouy, M. R. Zapatero Osorio +3
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 photosphe…
From Shock Breakout to Peak and Beyond: Extensive Panchromatic Observations of the Type Ib Supernova 2008D associated with Swift X-ray Transient 080109
Maryam Modjaz, W. Li, N. Butler +38
We present extensive early photometric (ultraviolet through near-infrared) and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D as well as X-ray data analysis…
The young, wide and very low mass visual binary LOri167
D. Barrado y Navascues, A. Bayo, M. Morales-Calderon +3
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…
Improved age constraints for the AB Dor quadruple system - The binary nature of AB Dor B
Markus Janson, Wolfgang Brandner, Rainer Lenzen +5
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 AB Dor A, which in turn has a very low…
A mid-infrared study of very low mass stars and brown dwarfs in Upper Scorpius
Herve Bouy, Nuria Huelamo, Eduardo L. Martin +3
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 (…
Spectroscopic rotational velocities of brown dwarfs
M. R. Zapatero Osorio, E. L. Martin, H. Bouy +3
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 o…
Multiplicity of very low-mass objects in the Upper Scorpius OB association: a possible wide binary population
H. Bouy, E. L. Martin, W. Brandner +5
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 pa…
Binaries among Ultra-cool Dwarfs and Brown Dwarfs
Wolfgang Brandner, Herve Bouy, Eduardo L. Martin +1
Observations of brown dwarfs provide important feedback on theories of atmospheres and inner structure of substellar objects. Brown dwarf binary systems furthermore offer the uniqu…
First determination of the dynamical mass of a binary L dwarf
H. Bouy, G. Duchene, R. Koehler +11
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 J…
X-ray Detections of Two Young Bona-Fide Brown Dwarfs
H. Bouy
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 ass…
A young binary Brown Dwarf in the R-CrA star formation region
H. Bouy, W. Brandner, E. L. Martin +5
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…
First NACO observations of the Brown Dwarf LHS 2397aB
E. Masciadri, W. Brandner, H. Bouy +3
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…
Multiplicity of Nearby Free-floating Ultra-cool Dwarfs: a HST-WFPC2 search for companions
Herve Bouy, Wolfgang Brandner, Eduardo L. Martin +3
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 ra…
An HST/WFPC2 Survey for Brown Dwarf Binaries in the alpha Per and the Pleiades Open Clusters
Eduardo L. Martin, David Barrado y Navascues, Isabelle Baraffe +2
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…
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…