期刊
ASTROPHYSICAL JOURNAL
卷 710, 期 2, 页码 1641-1653出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/710/2/1641
关键词
gravitational lensing: micro; planetary systems
资金
- MEXT Japan [18749004, 19015005]
- NSF [AST-0708890]
- NASA [NNX07AL71G, NNG04GL51G]
- Polish MNiSW [N20303032/4275]
- National Research Foundation of Korea [2009-0081561]
- Korea Astronomy and Space Science Institute
- [JSPS18253002]
- [JSPS20340052]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0757888] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/H002391/1, ST/G001987/1, PP/E001149/1] Funding Source: researchfish
- STFC [ST/H002391/1, ST/G001987/1, PP/E001149/1] Funding Source: UKRI
- National Research Council of Science & Technology (NST), Republic of Korea [2010130000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과06B1112, 2009-0081561] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [19015005, 18749004] Funding Source: KAKEN
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 Microlensing Observations in Astrophysics 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-circle dot 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-circle plus 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 comprises four cold Neptune/super-Earths, five gas giant planets, and another sub-Saturn mass planet whose nature is unclear. The discovery of these 10 cold exoplanets by the microlensing method implies that the mass ratio function of cold exoplanets scales as dN(pl)/d log q alpha q(-0.7+/-0.2) with a 95% confidence level upper limit of n < -0.35 ( where dN(pl)/d log q alpha 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.
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