A COLD NEPTUNE-MASS PLANET OGLE-2007-BLG-368Lb: COLD NEPTUNES ARE COMMON
作者： T Sumi , DP Bennett , IA Bond , A Udalski , V Batista
DOI: 10.1088/0004-637X/710/2/1641
关键词: Astronomy 、 Gas giant 、 Astrophysics 、 Gravitational microlensing 、 Planetary system 、 Planet 、 Neptune 、 Exoplanet 、 Microlensing Observations in Astrophysics 、 Physics 、 Stellar mass
摘要: We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with planet-star mass ratio q = [9.5 ± 2.1] × 10^(-5) via gravitational microlensing. The planetary deviation was detected in real-time thanks to high cadence Microlensing Observations Astrophysics survey, light-curve monitoring and intensive follow-up observations. A Bayesian analysis returns stellar distance at M_l 0.64^(+0.21)_(–0.26) M_☉ D_l 5.9^(+0.9)_(–1.4) kpc, respectively, so separation are M_p 20^(+7)_(–8) M_⊕ 3.3^(+1.4)_(–0.8) AU, respectively. This adds another cold sample discovered by microlensing, which now comprises four Neptune/super-Earths, five gas giant planets, sub-Saturn whose nature is unclear. these 10 exoplanets microlensing method implies that function scales as dN_(pl)/d log ∝ q^(–0.7±0.2) 95% confidence level upper limit n < –0.35 (where q^n). As most sensitive planets beyond snow-line, this least three times more common than Jupiters region level.
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