SAHLMANN, J.; BURGASSER, A. J.; BARDALEZ GAGLIUFFI, D. C.; LAZORENKO, P. F.; SÉGRANSAN, D.; ZAPATERO OSORIO, M. R.; BLAKE, C. H.; GELINO, C. R.; MARTÍN, E. L.; BOUY, H.

doi:10.1093/mnras/staa1235

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SAHLMANN, J.

BURGASSER, A. J.

BARDALEZ GAGLIUFFI, D. C.

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Monthly Notices of the Royal Astronomical Society. 2020, vol. 495, p. 1136-1147

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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 66-14+5 MJup for its T5.5 companion. For 2M1059-21, we find a 1.9-yr orbital period and a mass of 67-5+4 MJup 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.< Réduire

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binaries: close

brown dwarfs

astrometry

parallaxes

stars: low-mass

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Astrometric orbits of spectral binary brown dwarfs - I. Massive T dwarf companions to 2M1059-21 and 2M0805+48

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