Precision masses of the low-mass binary system GJ 623

Frantz Martinache*, James P. Lloyd, Michael J. Ireland, Ryan S. Yamada, Peter G. Tuthill

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Citations (Scopus)


We have used aperture masking interferometry and adaptive optics (AO) at the Palomar 200 inch telescope to obtain precise mass measurements of the binary M dwarf GJ 623. AO observations spread over 3 yr combined with a decade of radial velocity measurements constrain all orbital parameters of the GJ 623 binary system accurately enough to critically challenge the models. The dynamical masses measured are m1 = 0.371 ± 0.015 M (4%) and m2 = 0.115 ± 0.0023 M (2%) for the primary and the secondary, respectively. Models are not consistent with color and mass, requiring very low metallicities.

Original languageEnglish
Pages (from-to)496-501
Number of pages6
JournalAstrophysical Journal
Issue number1 I
Publication statusPublished - 20 May 2007
Externally publishedYes

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