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  • Print publication year: 2012
  • Online publication date: December 2012

27 - Extrasolar planets

from Part V - Applications of astrometry to topics in astrophysics



The Doppler detection of the Jupiter-mass planet around the nearby, solar-type star 51 Pegasi (Mayor and Queloz 1995) heralded the new era of discoveries of extrasolar planets orbiting normal stars. Four different techniques have been successfully used for the purpose of exoplanet detection. Decade-long, high-precision (1–5 m/s) radial-velocity surveys of ˜3000 F-G-K-M dwarfs and subgiants (e.g. Butler et al. 2006, Udry and Santos 2007, Eggenberger and Udry 2010) in the solar neighborhood (d ≤ 50 pc) have yielded so far the vast majority of the objects in the present sample (a total of over 760 planets in ˜600 systems, as of June 2012). Ground-based photometric transit surveys (e.g. Char-bonneau et al. 2007, Collier Cameron 2011) are uncovering new transiting systems at a rate of ˜30 per year, while space-borne observatories such as CoRoT and particularly Kepler hold promise of increasing by an order of magnitude the present yield (over 230 transiting systems known to date). Finally, over three dozen sub-stellar companions have also been detected so far by means of gravitational microlensing (e.g. Bond et al. 2004, Beaulieu et al. 2006, Gaudi et al. 2008, Muraki et al. 2011), direct-imaging surveys (e.g. Chauvin et al. 2005, Kalas et al. 2008, Marois et al. 2008, 2010), and timing techniques (Silvotti et al. 2007, Lee et al. 2009, Beuermann et al. 2010).

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