Astrometric orbits of spectral binary brown dwarfs - I. Massive T dwarf companions to 2M1059-21 and 2M0805+48
| dc.contributor.author | SAHLMANN, J. | |
| dc.contributor.author | BURGASSER, A. J. | |
| dc.contributor.author | BARDALEZ GAGLIUFFI, D. C. | |
| dc.contributor.author | LAZORENKO, P. F. | |
| dc.contributor.author | SÉGRANSAN, D. | |
| dc.contributor.author | ZAPATERO OSORIO, M. R. | |
| dc.contributor.author | BLAKE, C. H. | |
| dc.contributor.author | GELINO, C. R. | |
| dc.contributor.author | MARTÍN, E. L. | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | BOUY, H. | |
| dc.date.issued | 2020 | |
| dc.identifier.issn | 0035-8711 | |
| dc.description.abstractEn | 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. | |
| dc.language.iso | en | |
| dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
| dc.subject.en | binaries: close | |
| dc.subject.en | brown dwarfs | |
| dc.subject.en | astrometry | |
| dc.subject.en | parallaxes | |
| dc.subject.en | stars: low-mass | |
| dc.title.en | Astrometric orbits of spectral binary brown dwarfs - I. Massive T dwarf companions to 2M1059-21 and 2M0805+48 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1093/mnras/staa1235 | |
| dc.subject.hal | Planète et Univers [physics] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 2004.14889 | |
| bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
| bordeaux.page | 1136-1147 | |
| bordeaux.volume | 495 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | insu-03678867 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//insu-03678867v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2020&rft.volume=495&rft.spage=1136-1147&rft.epage=1136-1147&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=SAHLMANN,%20J.&BURGASSER,%20A.%20J.&BARDALEZ%20GAGLIUFFI,%20D.%20C.&LAZORENKO,%20P.%20F.&S%C3%89GRANSAN,%20D.&rft.genre=article |
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