New neighbours. I. 13 new companions to nearby M dwarfs

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dc.creatorDelfosse, X.
dc.creatorForveille, T.
dc.creatorBeuzit, J. -L.
dc.creatorUdry, S.
dc.creatorMayor, M.
dc.creatorPerrier, C.
dc.date1998-12-01
dc.date.accessioned2026-07-07T02:29:23Z
dc.date.available2026-07-07T02:29:23Z
dc.descriptionWe present preliminary results of a radial-velocity search for companions to a volume limited sample of M dwarfs. Typical accuracy range between 10m/s for the brighter stars and 70m/s at our limiting magnitude. We complement the radial velocity monitoring with adaptive optics imaging to identify close visual companions in a larger volume-limited sample. For stellar companions the two techniques together cover the full separation range, to beyond the limiting distance of the sample. We will therefore eventually obtain a statistically meaningful inventory of the stellar multiplicity of nearby M-dwarf systems. We also have useful sensitivity to giant planets, as illustrated by our recent detection of a planetary companion to Gl 876. After 2.5 years, we have discovered 12 previously unknown components in this 127 stars sample. 7 of these are actually beyond our 9 pc limit, and were included on the basis of photometric parallaxes which were biased-down by the unrecognized companion. The remaining 5 are true additions to the 9 pc inventory. More are certainly forthcoming, given our present selection bias towards short periods and relatively massive companions. We have derived orbital elements for 7 of the new systems, and for some previously known binaries. One system is a Post-Common-Envelope WD+M binary. Some of the new binaries have excellent prospects for an accurate mass determination over the next few years. Preliminary masses have accuracies of 2% at 0.4-0.6 \Msol and 10% at 0.1 \Msol.
dc.description14 pages, 4 figures. Accepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9812008
dc.identifierhttp://arxiv.org/abs/astro-ph/9812008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13454
dc.subjectAstrophysics
dc.titleNew neighbours. I. 13 new companions to nearby M dwarfs
dc.typetext

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