Planetary transit surveys

Details Planetary transit surveys Planetary transit surveys

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.485..137h&link_type=abstract

In: Proceedings of the First Eddington Workshop on Stellar Structure and Habitable Planet Finding, 11 - 15 June 2001, Córdoba, S

Physics

9

Planets: Exoplanets

Scientific paper

I review the status and prospects of ground-based planetary transit surveys in the era before the Eddington and Kepler missions. Over 70 extra-solar planets have been found to date by high precision radial velocity searches, but so far only one of these exhibits planetary transits. This situation should dramatically reverse in the next few years as photometric searches begin to find large numbers of "Hot Jupiters" that transit in front of their host stars. I discuss and illustrate the methods being used to assess the planet catch of the Eddington mission. Scaling laws are derived to express the planet catch in terms of instrument parameters and planet type. More detailed Monte Carlo simulations yield simulated planet catalogs. Eddington's survey volume for Earth-analog planets extends to d ≍ 300 pc, and scales with star mass, planet radius and temperature as M-1/8r2T, strongly favouring large hot planets. The Eddington baseline design is likely to deliver only a handful of habitable Earths. The planet catch can be increased by design changes, subject of course to cost and feasibility constraints, to maximize the figure of merit Ωd3 ~ Ω(N At)3/2, where N is the number of co-aligned telescopes, A and Ω are the effective pupil area and solid angle of each telescope, and t is the duration of the mission.

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