A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common
A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common
We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet-star mass ratio of q=[9.5 +/- 2.1] x 10^{-5} via gravitational microlensing. The planetary deviation was detected in real-time thanks to the high cadence of the MOA survey, real-time light curve monitoring and intensive follow-up observations. A Bayesian analysis returns the stellar mass and distance at M_l = 0.64_{-0.26}^{+0.21} M_\sun and D_l = 5.9_{-1.4}^{+0.9} kpc, respectively, so the mass and separation of the planet are M_p = 20_{-8}^{+7} M_\oplus and a = 3.3_{-0.8}^{+1.4} AU, respectively. This discovery adds another cold Neptune-mass planet to the planetary sample discovered by microlensing, which now comprise four cold Neptune/Super-Earths, five gas giant planets, and another sub-Saturn mass planet whose nature is unclear. The discovery of these ten cold exoplanets by the microlensing method implies that the mass ratio function of cold exoplanets scales as dN_{\rm pl}/d\log q \propto q^{-0.7 +/- 0.2} with a 95% confidence level upper limit of n < -0.35 (where dN_{\rm pl}/d\log q \propto q^n). As microlensing is most sensitive to planets beyond the snow-line, this implies that Neptune-mass planets are at least three times more common than Jupiters in this region at the 95% confidence level.
J. Donatowicz、C. Han、J. Greenhill、E. Corrales、T. Sako、Y. Matsubara、P. M. Kilmartin、M. Zub、:、M. K. Szyma、M. D. Albrow、E. Martioli、V. Batista、J. Janczak、D. P. Bennett、W. Lin、U. G. J、K. Masuda、G. W. Christie、N. Miyake、The OGLE Collaboration、I. Soszy、:、I. A. Bond、M. Hoffman、K. Kamiya、K. C. Sahu、P.、T. Okumura、D. J. Sullivan、P. Rojo、The microFUN Collaboration、M. Nagaya、K. Cook、F. Abe、B. Macintosh、J. McCormick、J. P. Beaulieu、J. Wambsganss、B. Monard、C. H. Ling、D. L. DePoy、S. Kane、U. Marboeuf、Y. Tsapras、P. Fouqu¨|、C. -U. Lee、K. Horne、K. R. Pollard、L. Skuljan、Ch. Coutures、B. S. Gaudi、E. Pedretti、J. B. Marquette、I. Steele、The MOA Collaboration、R. Street、F. Mallia、A. Fukui、C. S. Botzler、K. Ohnishi、W. L. Sweatman、A. Udalski、Y. C. Perrott、B. -G. Park、R. W. Pogge、A. Gould、J. A. R. Caldwell、F. Jablonski、N. Kains、K. Hill、S. Dong、D. Kubas、S. Brillant、A. Cassan、C. Snodgrass、M. Kubiak、K. Ulaczyk、A. Korpela、D. M. Bramich、M. Dominik、O. Pejcha、M. F. Duran、M. Bode、Y. Itow、R. Martin、N. Rattenbury、G. Pietrzy、D. Dominis Prester、:、The PLANET Collaboration、P. C. M. Yock、:、K. Furusawa、A. Williams、T. Nagayama、W. Allen、J. B. Hearnshaw、Y. Muraki、J. Menzies、T. Natusch、A. Cole、T. Sumi、H. Calitz、S. Dieters、P. Meintjes、O. Szewczyk、R. Santallo、M. J. Burgdorf、To. Saito
天文学
J. Donatowicz,C. Han,J. Greenhill,E. Corrales,T. Sako,Y. Matsubara,P. M. Kilmartin,M. Zub,:,M. K. Szyma,M. D. Albrow,E. Martioli,V. Batista,J. Janczak,D. P. Bennett,W. Lin,U. G. J,K. Masuda,G. W. Christie,N. Miyake,The OGLE Collaboration,I. Soszy,:,I. A. Bond,M. Hoffman,K. Kamiya,K. C. Sahu,P.,T. Okumura,D. J. Sullivan,P. Rojo,The microFUN Collaboration,M. Nagaya,K. Cook,F. Abe,B. Macintosh,J. McCormick,J. P. Beaulieu,J. Wambsganss,B. Monard,C. H. Ling,D. L. DePoy,S. Kane,U. Marboeuf,Y. Tsapras,P. Fouqu¨|,C. -U. Lee,K. Horne,K. R. Pollard,L. Skuljan,Ch. Coutures,B. S. Gaudi,E. Pedretti,J. B. Marquette,I. Steele,The MOA Collaboration,R. Street,F. Mallia,A. Fukui,C. S. Botzler,K. Ohnishi,W. L. Sweatman,A. Udalski,Y. C. Perrott,B. -G. Park,R. W. Pogge,A. Gould,J. A. R. Caldwell,F. Jablonski,N. Kains,K. Hill,S. Dong,D. Kubas,S. Brillant,A. Cassan,C. Snodgrass,M. Kubiak,K. Ulaczyk,A. Korpela,D. M. Bramich,M. Dominik,O. Pejcha,M. F. Duran,M. Bode,Y. Itow,R. Martin,N. Rattenbury,G. Pietrzy,D. Dominis Prester,:,The PLANET Collaboration,P. C. M. Yock,:,K. Furusawa,A. Williams,T. Nagayama,W. Allen,J. B. Hearnshaw,Y. Muraki,J. Menzies,T. Natusch,A. Cole,T. Sumi,H. Calitz,S. Dieters,P. Meintjes,O. Szewczyk,R. Santallo,M. J. Burgdorf,To. Saito.A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common[EB/OL].(2009-12-07)[2025-06-23].https://arxiv.org/abs/0912.1171.点此复制
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