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

Beaulieu, J.-P; Bennett, D P; Fouque, P; Williams, Andrew; Sackett, Penny; Dominik, M; Jorgensen, U G; Kubas, D; Cassan, A; Coutures, C; Greenhill, J; Hearnshaw, J B; Hill, Kym

Description

In the favoured core-accretion model of formation of planetary systems, solid planetesimals accumulate to build up planetary cores, which then accrete nebular gas if they are sufficiently massive. Around M-dwarf stars (the most common stars in our Galaxy), this model favours the formation of Earth-mass (M ⊕) to Neptune-mass planets with orbital radii of 1 to 10 astronomical units (AU), which is consistent with the small number of gas giant planets known to orbit M-dwarf host stars 1-4. More...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
URI: http://hdl.handle.net/1885/17086
Source: Nature
DOI: 10.1038/nature04441

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