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Title:
One or more bound planets per Milky Way star from microlensing observations
Authors:
Cassan, A.; Kubas, D.; Beaulieu, J.-P.; Dominik, M.; Horne, K.; Greenhill, J.; Wambsganss, J.; Menzies, J.; Williams, A.; Jørgensen, U. G.; Udalski, A.; Bennett, D. P.; Albrow, M. D.; Batista, V.; Brillant, S.; Caldwell, J. A. R.; Cole, A.; Coutures, Ch.; Cook, K. H.; Dieters, S.; Prester, D. Dominis; Donatowicz, J.; Fouqué, P.; Hill, K.; Kains, N.; Kane, S.; Marquette, J.-B.; Martin, R.; Pollard, K. R.; Sahu, K. C.; Vinter, C.; Warren, D.; Watson, B.; Zub, M.; Sumi, T.; Szymanski, M. K.; Kubiak, M.; Poleski, R.; Soszynski, I.; Ulaczyk, K.; Pietrzynski, G.; Wyrzykowski, L.
Affiliation:
AA(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France), AB(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France), AC(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France), AD(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Scottish Universities Physics Alliance (SUPA), University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK), AE(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Scottish Universities Physics Alliance (SUPA), University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK), AF(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia), AG(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Astronomischen Rechen-Instituts (ARI), Zentrum für Astronomie, Heidelberg University, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany), AH(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; South African Astronomical Observatory, PO Box 9 Observatory 7935, South Africa), AI(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia), AJ(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Niels Bohr Institute and Centre for Star and Planet Formation, Juliane Mariesvej 30, 2100 Copenhagen, Denmark), AK(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), AL(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Notre Dame, Physics Department, 225 Nieuwland Science Hall, Notre Dame, Indiana 46530, USA), AM(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8140, New Zealand), AN(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France), AO(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; European Southern Observatory, Alonso de Cordoba 3107, Vitacura, Casilla 19001, Santiago, Chile), AP(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA), AQ(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia), AR(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France), AS(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, PO Box 808, California 94550, USA), AT(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia), AU(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Department of Physics, University of Rijeka, Omladinska 14, 51000 Rijeka, Croatia), AV(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Technical University of Vienna, Department of Computing, Wiedner Hauptstrasse 10, 1040 Vienna, Austria), AW(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Laboratoire Astrophysique de Toulouse (LATT), Université de Toulouse, CNRS, 31400 Toulouse, France), AX(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia), AY(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; European Southern Observatory Headquarters, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany), AZ(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue, Pasadena, California 91125, USA), BA(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France), BB(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Perth Observatory, Walnut Road, Bickley, Perth 6076, Australia), BC(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Canterbury, Department of Physics & Astronomy, Private Bag 4800, Christchurch 8140, New Zealand), BD(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA), BE(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Niels Bohr Institute and Centre for Star and Planet Formation, Juliane Mariesvej 30, 2100 Copenhagen, Denmark), BF(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia), BG(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; University of Tasmania, School of Maths and Physics, Private bag 37, GPO Hobart, Tasmania 7001, Australia), BH(Probing Lensing Anomalies Network (PLANET) Collaboration, Institut d'Astrophysique de Paris, Université Pierre & Marie Curie, UMR7095 UPMC-CNRS 98 bis boulevard Arago, 75014 Paris, France; Astronomischen Rechen-Instituts (ARI), Zentrum für Astronomie, Heidelberg University, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany), BI(Microlensing Observations in Astrophysics (MOA) Collaboration, Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan; Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan), BJ(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), BK(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), BL(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), BM(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), BN(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), BO(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland), BP(Optical Gravitational Lensing Experiment (OGLE) Collaboration, Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland)
Publication:
Nature, Volume 481, Issue 7380, pp. 167-169 (2012). (Nature Homepage)
Publication Date:
01/2012
Origin:
NATURE
Abstract Copyright:
(c) 2012: Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
DOI:
10.1038/nature10684
Bibliographic Code:
2012Natur.481..167C

Abstract

Most known extrasolar planets (exoplanets) have been discovered using the radial velocity or transit methods. Both are biased towards planets that are relatively close to their parent stars, and studies find that around 17-30% (refs 4, 5) of solar-like stars host a planet. Gravitational microlensing, on the other hand, probes planets that are further away from their stars. Recently, a population of planets that are unbound or very far from their stars was discovered by microlensing. These planets are at least as numerous as the stars in the Milky Way. Here we report a statistical analysis of microlensing data (gathered in 2002-07) that reveals the fraction of bound planets 0.5-10 AU (Sun-Earth distance) from their stars. We find that of stars host Jupiter-mass planets (0.3-10 MJ, where MJ = 318 M and M is Earth's mass). Cool Neptunes (10-30 M) and super-Earths (5-10 M) are even more common: their respective abundances per star are and . We conclude that stars are orbited by planets as a rule, rather than the exception.

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