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

  title={Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing},
  author={J. P. Beaulieu and David P. Bennett and Pascal Fouqu{\'e} and Anna Virginia Williams and Martin Dominik and Uffe Gr̊ae J\orgensen and Daniel Kubas and Arnaud Cassan and Ch. Coutures and John. Greenhill and Keric Hill and John R. W. Menzies and Penny Sackett and Michael D. Albrow and Sister Barbara Brillant and John A. Caldwell and J. J. Calitz and K. H. Cook and E C{\'a}ceres Corrales and M. Desort and Stefan W. Dieters and D. Dominis and J. Donatowicz and Matt S. Hoffman and Stephen R. Kane and J. B. Marquette and Ralph E. Martin and Peter L. Meintjes and Karen R. Pollard and Kailash C Sahu and Christina A Vinter and Joachim Wambsganss and Kevin L. Woller and Keith D. Horne and Iain A. Steele and D. M. Bramich and Martin J. Burgdorf and C Snodgrass and Michael F. Bode and Andrzej Udalski and Michał K. Szymański and Marcin Kubiak and T. Wickowski and Grzegorz Pietrzyński and Igor Soszynski and Olaf Szewczyk and Łukasz Wyrzykowski and Bohdan Paczyński and F. Abe and Ian A. Bond and Tracey Britton and Anne C Gilmore and John B. Hearnshaw and Yoshitaka Itow and Koki Kamiya and Paul Kilmartin and Antti Korpela and Kin-ichi Masuda and Yoshimi Matsubara and Makoto Motomura and Yasushi Muraki and Sunao Nakamura and Chinobu Okada and Katsuhiko Ohnishi and Nicholas James Rattenbury and Takuya Sako and Shizuka Sato and Mei Sasaki and Tomohiko Sekiguchi and Denis J. Sullivan and P. J. Tristram and P. C. M. Yock and Takuya Yoshioka},
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… CONTINUE READING
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