2002MNRAS.330..187C

In data from three clear nights of échelle spectroscopy in 2000 October/November, and using improved Doppler tomographic signal-analysis techniques, we have carried out a deep search for starlight reflected from the innermost of υ (upsilon) And's three planets. We place upper limits on the planet's radius R_p as functions of its projected orbital velocity K_p≃139.sin i.km/s for various assumptions about the wavelength-dependent geometric albedo spectrum p(λ) of its atmosphere. For a grey albedo p we find R_p.sqrt(p)≤0.98R_J, with 0.1 per cent false-alarm probability (4σ ). For a Sudarsky, Burrows & Pinto Class V model atmosphere, the mean albedo in our 380-676nm bandpass is p≃0.42, requiring R_p≲1.51R_J, whereas an (isolated) Class IV model with <p≥∼0.19 requires R_p<2.23R_J. The star's v_rotsin i∼10km/s and estimated rotation period Vrot=10km/s suggest a high orbital inclination 70-80°. We also develop methods for assessing the false-alarm probabilities of faint candidate detections, and for extracting information about the albedo spectrum and other planetary parameters from faint reflected-light signals.