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ヨネハラ アツノリ
YONEHARA ATSUNORI
米原 厚憲 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2016/03 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | MOA 2011-BLG-028Lb: a Neptune-mass Microlensing Planet in the Galactic Bulge |
| 執筆形態 | その他 |
| 掲載誌名 | The Astrophysical Journal |
| 巻・号・頁 | 820(1),pp.article id. 4 |
| 著者・共著者 | J. Skowron,A. Udalski,R. Poleski,S. Kozłowski,M. K. Szymański,Ł. Wyrzykowski,K. Ulaczyk,P. Pietrukowicz,G. Pietrzyński,I. Soszyński,F. Abe,D. P. Bennett,A. Bhattacharya,I. A. Bond,M. Freeman,A. Fukui,Y. Hirao,Y. Itow,N. Koshimoto,C. H. Ling,K. Masuda,Y. Matsubara,Y. Muraki,M. Nagakane,K. Ohnishi,N. Rattenbury,To. Saito,D. J. Sullivan,T. Sumi,D. Suzuki,P. J. Tristram,A. Yonehara,M. Dominik,U. G. Jørgensen,V. Bozza,K. Harpsøe,M. Hundertmark,J. Skottfelt |
| 概要 | We present the discovery of a Neptune-mass planet orbiting a 0.8 +- 0.3 M_Sun<br />
star in the Galactic bulge. The planet manifested itself during the<br /> microlensing event MOA 2011-BLG-028/OGLE-2011-BLG-0203 as a low-mass companion<br /> to the lens star. The analysis of the light curve provides the measurement of<br /> the mass ratio: (1.2 +- 0.2) x 10^-4, which indicates the mass of the planet to<br /> be 12-60 Earth masses. The lensing system is located at 7.3 +- 0.7 kpc away<br /> from the Earth near the direction to Baade's Window. The projected separation<br /> of the planet, at the time of the microlensing event, was 3.1-5.2 AU. Although<br /> the "microlens parallax" effect is not detected in the light curve of this<br /> event, preventing the actual mass measurement, the uncertainties of mass and<br /> distance estimation are narrowed by the measurement of the source star proper<br /> motion on the OGLE-III images spanning eight years, and by the low amount of<br /> blended light seen, proving that the host star cannot be too bright and<br /> massive. We also discuss the inclusion of undetected parallax and orbital<br /> motion effects into the models, and their influence onto the final physical<br /> parameters estimates. |
| DOI | 10.3847/0004-637X/820/1/4 |
| arXiv ID | arXiv:1512.03422 |
| PermalinkURL | http://arxiv.org/abs/1512.03422v1 |