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12 March 2025

» arxiv » astro-ph/0201393

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An Adaptive Optics Survey of M8-M9 Stars: Discovery of 4 Very Low mass Binaries With at Least One System Containing a Brown Dwarf Companion
Laird M. Close ; Nick Siegler ; Dan Potter ; Wolfgang Brandner ; James Liebert ;
Date:	23 Dec 2001
Subject:	astro-ph
Abstract:	Use of the highly sensitive Hokupa’a/Gemini curvature wavefront sensor has allowed for the first time direct adaptive optics (AO) guiding on M8-M9 very low mass (VLM) stars. An initial survey of 20 such objects (SpT=M8-M9) discovered 4 binaries. Three of the systems have separations of less than 4.2 AU and similar mass ratios (Delta K<0.8 mag; 0.853 AU. This is likely consistent with the 23+/-5% measured for more massive (M0-M6) stars over the same separation range. It appears M8-M9 binaries have a much smaller semi-major axis distribution peak (~4 AU; with no systems wider than 15 AU) compared to M and G stars which have a broad peak at larger ~30 AU separations.
Source:	arXiv, astro-ph/0201393
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