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A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common | | T. Sumi
; D.P. Bennett
; I.A. Bond
; A. Udalski
; V. Batista
; M. Dominik
; P. Fouqué
; D. Kubas
; A. Gould
; B. Macintosh
; K. Cook
; S. Dong
; L. Skuljan
; A. Cassan
; MOA Collaboration
; F. Abe
; C.S. Botzler
; A. Fukui
; K. Furusawa
; J.B. Hearnshaw
; Y. Itow
; K. Kamiya
; P.M. Kilmartin
; A. Korpela
; W. Lin
; C.H. Ling
; K. Masuda
; Y. Matsubara
; N. Miyake
; Y. Muraki
; M. Nagaya
; T. Nagayama
; K. Ohnishi
; T. Okumura
; Y.C. Perrott
; N. Rattenbury
; To. Saito
; T. Sako
; D.J. Sullivan
; W.L. Sweatman
; P.C.M. Yock
; PLANET Collaboration
; J.P. Beaulieu
; A. Cole
; Ch. Coutures
; M.F. Duran
; J. Greenhill
; F. Jablonski
; U. Marboeuf
; E. Martioli
; E. Pedretti
; O. Pejcha
; P. Rojo
; M.D. Albrow
; S. Brillant
; M. Bode
; D.M. Bramich
; M.J. Burgdorf
; J.A.R. Caldwell
; H. Calitz
; E. Corrales
; S. Dieters
; D. Dominis Prester
; J. Donatowicz
; K. Hill
; M. Hoffman
; K. Horne
; U.G. J
; N. Kains
; S. Kane
; J.B. Marquette
; R. Martin
; P. Meintjes
; J. Menzies
; K.R. Pollard
; K.C. Sahu
; C. Snodgrass
; I. Steele
; R. Street
; Y. Tsapras
; J. Wambsganss
; A. Williams
; M. Zub
; OGLE Collaboration
; M.K. Szyma
; M. Kubiak
; G. Pietrzy
; I. Soszy
; O. Szewczyk
; K. Ulaczyk
; $mu$FUN Collaboration
; W. Allen
; G.W. Christie
; D.L. DePoy
; B.S. Gaudi
; C. Han
; J. Janczak
; C.-U. Lee
; J. McCormick
; F. Mallia
; B. Monard
; T. Natusch
; B.-G. Park
; R.W. Pogge
; R. Santallo
; | | Date: |
7 Dec 2009 | | Abstract: | 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] x10^{-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 that could be a cold Neptune or
Super-Earth. The discovery of these ten cold exoplanets by the microlensing
method implies that the mass function of cold exoplanets scales as Psi(q)
propto q^{-1.7+/- 0.2} with a 95% confidence level upper limit of n < -1.35
(where Psi(q) propto q^n). The microlensing sensitivity region is largely
beyond the snow-line, so this implies that Neptune-mass planets are at least
three times more common than Jupiters, beyond the snow-line at the 95%
confidence level. | | Source: | arXiv, 0912.1171 | | Services: | Forum | Review | PDF | Favorites | |
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