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

@article{Beaulieu2006DiscoveryOA,
  title={Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing},
  author={J. Beaulieu and D. Bennett and P. Fouqu{\'e} and A. Williams and M. Dominik and U. J{\o}rgensen and D. Kubas and A. Cassan and C. Coutures and J. Greenhill and K. Hill and J. Menzies and P. Sackett and M. Albrow and S. Brillant and J. Caldwell and J. Calitz and K. Cook and E. Corrales and M. Desort and S. Dieters and D. Dominis and J. Donatowicz and M. Hoffman and S. Kane and J. Marquette and R. Martin and P. Meintjes and K. Pollard and K. Sahu and C. Vinter and J. Wambsganss and K. Woller and K. Horne and I. Steele and D. Bramich and M. Burgdorf and C. Snodgrass and M. Bode and A. Udalski and M. Szymański and M. Kubiak and T. Wickowski and G. Pietrzyński and I. Soszyński and O. Szewczyk and Ł. Wyrzykowski and B. Paczyński and F. Abe and I. Bond and T. Britton and A. Gilmore and J. Hearnshaw and Y. Itow and K. Kamiya and P. Kilmartin and A. Korpela and K. Masuda and Y. Matsubara and M. Motomura and Y. Muraki and S. Nakamura and C. Okada and K. Ohnishi and N. Rattenbury and T. Sako and S. Sato and M. Sasaki and T. Sekiguchi and D. Sullivan and P. Tristram and P. Yock and T. Yoshioka},
  journal={Nature},
  year={2006},
  volume={439},
  pages={437-440}
}
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. More than 170… Expand
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