EAS Publications Series

Issue		EAS Publications Series Volume 12, 2004 Astronomy with High Contrast Imaging II
Page(s)		319 - 336
DOI		10.1051/eas:2004046

Astronomy with High Contrast Imaging II
C. Aime and R. Soummer (eds)
EAS Publications Series, 12 (2004) 319-336
DOI: 10.1051/eas:2004046

Low mass companions searches using high dynamic range imaging

J.-L. Beuzit¹, G. Chauvin², X. Delfosse¹, T. Forveille³, A.-M. Lagrange¹, L. Marchal¹, M. Mayor⁴, F. Ménard¹, D. Mouillet⁵, C. Perrier¹, D. Ségransan⁴ and S. Udry⁴

¹ Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
² European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile
³ Canada-France-Hawaii Telescope Corporation, PO Box 1597, Kamuela HI-96743, USA
⁴ Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
⁵ Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées, BP. 826, 65008 Tarbes, France

Abstract
We present results obtained with different adaptive optics systems (ADONIS, PUEO, NAOS), in either imaging or coronagraphic modes, in the frame of several surveys aimed at searching for very low mass stars and substellar objects around nearby M dwarfs as well as in young closeby associations. For the M dwarfs of the solar neighborhood, we have obtained a very accurate mass-luminosity relation that we can compare to the prediction of recent stellar structure models. We also present multiplicity statistics of M dwarfs (binary fraction, period and mass ratio distribution), which are crucial constraints for stellar formation scenarii. We also discuss results obtained on two young closeby associations, MBM12 and Tucana-Horologium.

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