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The probability that an exoplanet transits its host star is high for planetsin close orbits, but drops off rapidly for increasing semimajor axes. Thismakes transit surveys for planets with large semimajor axes orbiting brightstars impractical, since one would need to continuously observe hundreds ofstars that are spread out over the entire sky. One way to make such a surveytractable is to constrain the inclination of the stellar rotation axes inadvance, and thereby enhance the transit probabilities. We derive transitprobabilities for stars with stellar inclination constraints, considering areasonable range of planetary system inclinations. We find that stellarinclination constraints can improve the transit probability by almost an orderof magnitude for habitable-zone planets. When applied to an ensemble of stars,such constraints dramatically lower the number of stars that need to beobserved in a targeted transit survey. We also consider multiplanet systemswhere only one planet has an identified transit, and derive the transitprobabilities for the second planet assuming a range of mutual planetaryinclinations.

Transit Probabilities for Stars With Stellar Inclination Constraints