COSMIC SECRETS
Extra Solar Planets
New Planets Discovered
OGLE-2005-BLG-390Lb
Discovery of a Cool Planet of 5.5 Earth Masses
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Image credit: Trent Schindler, National Science Foundation

Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing

Here we report the discovery of a 5.5Me planetary companion at a separation of 2.5au from a 0.22Ms M-dwarf star, where Ms refers to a solar mass and Me refers to Earth mass.

(We propose to name it OGLE-2005-BLG-390Lb, indicating a planetary mass companion to the lens star of the microlensing event.) The mass is lower than that of GJ876d (ref. 5), although the error bars overlap. Our detection suggests that such cool, sub-Neptune-mass planets may be more common than gas giant planets, as predicted by the core accretion theory

SOURCE: Nature Journals

Earth's twin found at heart of Milky Way - Thursday, 26 January 2006 

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