103 citations · 218 across the 7 of their papers we have counts for
8 papers
Astrometric planet search around southern ultracool dwarfs: V. Discovery of the exoplanet candidate PALTA-1 b
J. Sahlmann, P. F. Lazorenko, E. L. Martín +3
We report the discovery of PALTA-1 b, a sub-Jupiter mass exoplanet candidate orbiting the nearby early-L dwarf DENIS-P J1253108-570924 (DE1253-57) located at a distance of ~17 pc.…
Astrometric planet search around southern ultracool dwarfs IV. Relative motion of the FORS2/VLT CCD chips
P. F. Lazorenko, J. Sahlmann
We present an investigation of the stability of the two chips in the FORS2 camera CCD mosaic on the basis of astrometric observations of stars in 20 sky fields, some of which were…
Astrometric planet search around southern ultracool dwarfs III. Discovery of a brown dwarf in a 3-year orbit around DE0630-18
J. Sahlmann, P. F. Lazorenko, D. Segransan +4
Using astrometric measurements obtained with the FORS2/VLT camera, we are searching for low-mass companions around 20 nearby ultracool dwarfs. With a single-measurement precision o…
Astrometric planet search around M8--L2 dwarfs from the ground and with Gaia
J. Sahlmann, P. F. Lazorenko, D. Segransan +4
Ultra-cool dwarfs are very low-mass stars or brown dwarfs and because of their faintness they are difficult targets for radial velocity and transit planet searches. High-precision…
Astrometric planet search around southern ultracool dwarfs II: Astrometric reduction methods and a deep astrometric catalogue
P. F. Lazorenko, J. Sahlmann, D. Segransan +4
We describe the astrometric reduction of images obtained with the FORS2/VLT camera in the framework of an astrometric planet search around 20 M/L-transition dwarfs. We present the…
Astrometric planet search around southern ultracool dwarfs I: First results, including parallaxes of 20 M8-L2 dwarfs
J. Sahlmann, P. F. Lazorenko, D. Segransan +4
Extrasolar planet searches targeting very low-mass stars and brown dwarfs are hampered by intrinsic or instrumental limitations. Time series of astrometric measurements with precis…
Astrometric search for a planet around VB 10
P. F. Lazorenko, J. Sahlmann, D. Segransan +9
We observed VB 10 in August and September 2009 using the FORS2 camera of the VLT with the aim of measuring its astrometric motion and of probing the presence of the announced plane…
New neighbours. III. 21 new companions to nearby dwarfs, discovered with adaptive optics
J. -L. Beuzit, D. Segransan, T. Forveille +8
We present some results of a CFHT adaptive optics search for companions to nearby dwarfs. We identify 21 new components in solar neighbourhood systems, of which 13 were found while…