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Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing.
Nature 2006; 439(7075):437-40Nat

Abstract

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(o)) 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 extrasolar planets have been discovered with a wide range of masses and orbital periods, but planets of Neptune's mass or less have not hitherto been detected at separations of more than 0.15 au from normal stars. Here we report the discovery of a 5.5(+5.5)(-2.7) M(o) planetary companion at a separation of 2.6+1.5-0.6 au from a 0.22+0.21-0.11 M(o) M-dwarf star, where M(o) refers to a solar 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.

Authors+Show Affiliations

PLANET/RoboNet Collaboration, CNRS, Université Pierre et Marie Curie UMR7095, 98bis Boulevard Arago, 75014 Paris, France. beaulieu@iap.frNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16437108

Citation

Beaulieu, J-P, et al. "Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing." Nature, vol. 439, no. 7075, 2006, pp. 437-40.
Beaulieu JP, Bennett DP, Fouqué P, et al. Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing. Nature. 2006;439(7075):437-40.
Beaulieu, J. P., Bennett, D. P., Fouqué, P., Williams, A., Dominik, M., Jørgensen, U. G., ... Yoshioka, T. (2006). Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing. Nature, 439(7075), pp. 437-40.
Beaulieu JP, et al. Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing. Nature. 2006 Jan 26;439(7075):437-40. PubMed PMID: 16437108.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing. AU - Beaulieu,J-P, AU - Bennett,D P, AU - Fouqué,P, AU - Williams,A, AU - Dominik,M, AU - Jørgensen,U G, AU - Kubas,D, AU - Cassan,A, AU - Coutures,C, AU - Greenhill,J, AU - Hill,K, AU - Menzies,J, AU - Sackett,P D, AU - Albrow,M, AU - Brillant,S, AU - Caldwell,J A R, AU - Calitz,J J, AU - Cook,K H, AU - Corrales,E, AU - Desort,M, AU - Dieters,S, AU - Dominis,D, AU - Donatowicz,J, AU - Hoffman,M, AU - Kane,S, AU - Marquette,J-B, AU - Martin,R, AU - Meintjes,P, AU - Pollard,K, AU - Sahu,K, AU - Vinter,C, AU - Wambsganss,J, AU - Woller,K, AU - Horne,K, AU - Steele,I, AU - Bramich,D M, AU - Burgdorf,M, AU - Snodgrass,C, AU - Bode,M, AU - Udalski,A, AU - Szymański,M K, AU - Kubiak,M, AU - Wieckowski,T, AU - Pietrzyński,G, AU - Soszyński,I, AU - Szewczyk,O, AU - Wyrzykowski,L, AU - Paczyński,B, AU - Abe,F, AU - Bond,I A, AU - Britton,T R, AU - Gilmore,A C, AU - Hearnshaw,J B, AU - Itow,Y, AU - Kamiya,K, AU - Kilmartin,P M, AU - Korpela,A V, AU - Masuda,K, AU - Matsubara,Y, AU - Motomura,M, AU - Muraki,Y, AU - Nakamura,S, AU - Okada,C, AU - Ohnishi,K, AU - Rattenbury,N J, AU - Sako,T, AU - Sato,S, AU - Sasaki,M, AU - Sekiguchi,T, AU - Sullivan,D J, AU - Tristram,P J, AU - Yock,P C M, AU - Yoshioka,T, PY - 2005/09/28/received PY - 2005/11/14/accepted PY - 2006/1/27/pubmed PY - 2006/1/27/medline PY - 2006/1/27/entrez SP - 437 EP - 40 JF - Nature JO - Nature VL - 439 IS - 7075 N2 - 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(o)) 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 extrasolar planets have been discovered with a wide range of masses and orbital periods, but planets of Neptune's mass or less have not hitherto been detected at separations of more than 0.15 au from normal stars. Here we report the discovery of a 5.5(+5.5)(-2.7) M(o) planetary companion at a separation of 2.6+1.5-0.6 au from a 0.22+0.21-0.11 M(o) M-dwarf star, where M(o) refers to a solar 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. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/16437108/Discovery_of_a_cool_planet_of_5_5_Earth_masses_through_gravitational_microlensing_ L2 - https://doi.org/10.1038/nature04441 DB - PRIME DP - Unbound Medicine ER -