Astrometric orbits of spectral binary brown dwarfs - I. Massive T dwarf companions to 2M1059-21 and 2M0805+48
Language
en
Article de revue
This item was published in
Monthly Notices of the Royal Astronomical Society. 2020, vol. 495, p. 1136-1147
Oxford University Press (OUP): Policy P - Oxford Open Option A
English Abstract
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 amenable to orbit determination and individual ...Read more >
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 amenable to orbit determination and individual mass measurements via astrometric monitoring. Here, we present first results of a multiyear campaign to obtain high-precision absolute astrometry for spectral binaries using the Gemini-South and Gemini-North GMOS imagers. We measure the complete astrometric orbits for two systems: 2M0805+48 and 2M1059-21. Our astrometric orbit of 2M0805+48 is consistent with its 2-yr radial velocity orbit determined previously and we find a mass of 66<SUB>-14</SUB><SUP>+5</SUP> M<SUB>Jup</SUB> for its T5.5 companion. For 2M1059-21, we find a 1.9-yr orbital period and a mass of 67<SUB>-5</SUB><SUP>+4</SUP> M<SUB>Jup</SUB> for its T3.5 companion. We demonstrate that sub-milliarcsecond absolute astrometry can be obtained with both GMOS imagers and that this is an efficient avenue for confirming and characterizing ultracool binary systems.Read less <
English Keywords
binaries: close
brown dwarfs
astrometry
parallaxes
stars: low-mass
Origin
Hal imported