An Upper Bound on the Flux Ratio of rho CrB's Companion at 1.6um

Details An Upper Bound on the Flux Ratio of rho CrB's Companion at 1.6um An Upper Bound on the Flux Ratio of rho CrB's Companion at 1.6um

2004-09-17

arxiv.org/abs/astro-ph/0409433v1

Astron.J.129:402,2005

Astronomy and Astrophysics

Astrophysics

22 pages, 10 figures, accepted for publication in the Astronomical Journal

Scientific paper

10.1086/426331

We use high resolution infrared spectroscopy to investigate the 2001 report by Gatewood and colleagues that rho CrB's candidate extrasolar planet companion is really a low-mass star with mass 0.14+-0.05 Msun. We do not detect evidence of such a companion; the upper bounds on the (companion/primary) flux ratio at 1.6 microns are less than 0.0024 and 0.005 at the 90 and 99% confidence levels, respectively. Using the H-band mass-luminosity relationship calculated by Baraffe and colleagues, the corresponding upper limits on the companion mass are 0.11 and 0.15 Msun. Our results indicate that the infrared spectroscopic technique can detect companions in binaries with flux ratios as low as 0.01 to 0.02.

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