Discovery of a Cool, Low-Mass, Extra-solar Planet by Gravitational Microlensing

Details Discovery of a Cool, Low-Mass, Extra-solar Planet by Gravitational Microlensing Discovery of a Cool, Low-Mass, Extra-solar Planet by Gravitational Microlensing

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.6802b&link_type=abstract

American Astronomical Society Meeting 207, #68.02; Bulletin of the American Astronomical Society, Vol. 37, p.1266

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Scientific paper

We present photometry from the PLANET, OGLE, and MOA Collaborations which reveals the first discovery of a low-mass extra-solar planet by the gravitational microlensing method. The newly discovered planet orbits a low-mass star in the Galactic bulge, and its most probable mass is smaller than the mass of any other planet found orbiting a main sequence star, although the error bars on the planetary mass overlap with those of GL 876 d. The separation of the newly discovered planet from its host star is about 3 AU, and so it represents the first of a class of cool, low-mass planets that are currently detectable only by the gravitational microlensing method. This discovery appears to support a prediction of the core-accretion model for planet formation.

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