摘要：

Of the approximately 350 extrasolar planets currently known, of order 10% orbit evolved stars with radii R * 2.5 R ☉. These planets are of particular interest because they tend to orbit more massive hosts, and have been subjected to variable stellar insolation over their recent histories as their primaries evolved off the main sequence. Unfortunately, we have limited information about the physical properties of these planets, as they were all detected by the radial velocity method and none have been observed to transit. Here, we evaluate the prospects for detecting transits of planetary companions to giant stars. We show that several of the known systems have a priori transit probabilities of 10%, and about one transiting syst

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