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. Fouqu\'e, D. Kubas, A. Gould, B. Macintosh, K. Cook, S. Dong, L. Skuljan,, A. Cassan, The MOA Collaboration: F. Abe, C.S. Botzler, A. Fukui, K., Furusawa, J.B. Hearnshaw, Y. Itow, K. Kamiya, P.M. Kilmartin

TL;DR
This paper reports the discovery of a Neptune-mass exoplanet via gravitational microlensing, demonstrating that cold Neptunes are at least three times more common than Jupiters beyond the snow-line.
Contribution
It presents a new cold Neptune-mass planet discovery and analyzes the statistical frequency of such planets compared to gas giants.
Findings
Cold Neptunes are at least three times more common than Jupiters beyond the snow-line.
The mass ratio function of cold exoplanets scales as q^{-0.7 +/- 0.2}.
Ten cold exoplanets have been discovered by microlensing so far.
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] 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…
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