66 citations · 463 across the 22 of their papers we have counts for
23 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.…
Differential image motion in astrometric observations with very large seeing-limited telescopes
P. F. Lazorenko, J. Sahlmann, M. Mayor +1
We investigate how to quantitatively model the observed differential image motion (DIM) in relative astrometric observations. As a test bed we used differential astrometric observa…
Astrometric orbits of spectral binary brown dwarfs I: Massive T dwarf companions to 2M105921 and 2M080548
J. Sahlmann, A. J. Burgasser, D. C. Bardalez Gagliuffi +7
Near-infrared spectroscopic surveys have uncovered a population of short-period, blended-light spectral binaries composed of low-mass stars and brown dwarfs. These systems are amen…
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…
Updated astrometry and masses of the LUH 16 brown dwarf binary
P. F. Lazorenko, J. Sahlmann
The nearest known binary brown dwarf WISE J104915.57-531906.1AB (LUH 16) is a well-studied benchmark for our understanding of substellar objects. Previously published astrometry of…
Gaia and VLT astrometry of faint stars: Precision of Gaia DR1 positions and updated VLT parallaxes of ultracool dwarfs
P. F. Lazorenko, J. Sahlmann
We compared positions of the Gaia first data release (DR1) secondary data set at its faint limit with CCD positions of stars in 20 fields observed with the VLT/FORS2 camera. The FO…