A search for starlight reflected from υ And's innermost planet

被引:37
作者
Collier Cameron, A [1 ]
Horne, K
Penny, A
Leigh, C
机构
[1] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
[2] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
关键词
methods : data analysis; techniques : spectroscopic; stars : individual : upsilon And; planetary systems;
D O I
10.1046/j.1365-8711.2002.05084.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In data from three clear nights of echelle 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 v (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 approximate to 139 sin i km s (1) for various assumptions about the wavelength-dependent geometric albedo spectrum p(lambda) of its atmosphere. For a grey albedo p we find Rprootp < 0.98 R-j, with 0.1 per cent false-alarm probability (4 sigma). For a Sudarsky, Burrows & Pinto Class V model atmosphere, the mean albedo in our 380-676 nm bandpass is [p] similar to 0.42, requiring R-P < 1.51 R-J, whereas an (isolated) Class IV model with [p] similar to 0.19 requires R-P < 2.23 R-J. The star's v(rot) sin i similar to 10 km s(-1) and estimated rotation period P-rot similar to 10 d suggest a high orbital inclination i similar to 70 degrees-80 degrees. 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.
引用
收藏
页码:187 / 204
页数:18
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