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25 April 2024

» arxiv » 0910.1544

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The Masses and Radii of HD186753B and TYC7096-222-1B: The First M-dwarfs known to Eclipse A-type Stars
S. J. Bentley ; B. Smalley ; P. F. L. Maxted ; C. Hellier ; D. M. Wilson ; D. R. Anderson ; A. Collier Cameron ; M. Gillon ; L. Hebb ; D. L. Pollacco ; D. Queloz ; A. H. M. J. Triaud ; R. G. West ;
Date:	8 Oct 2009
Abstract:	We present observations of two new single-lined eclipsing binaries, both consisting of an Am star and an M-dwarf, discovered by the Wide Angle Search for Planets transit photometry survey. Using WASP photometry and spectroscopic measurements we find that HD186753B has an orbital period of $P=1.9194$ days, a mass of $M=0.24pm0.02 M_{odot}$ and radius of $R=0.31^{+0.06}_{-0.06} R_{odot}$; and that TCY7096-222-1B has an orbital period of $P=8.9582$ days, a mass of between 0.29 and 0.54 $M_{odot}$ depending on eccentricity and radius of $R=0.263^{+0.02}_{-0.07} R_{odot}$. We find that the Am stars have relatively low rotational velocities that closely match the orbital velocities of the M-dwarfs, suggesting that they have been ’’spun-down’’ by the M-dwarfs.
Source:	arXiv, 0910.1544
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