A NEW NONPLANETARY INTERPRETATION OF THE MICROLENSING EVENT OGLE-2013-BLG-0723

被引：8
|
作者：
Han, Cheongho [1 ]
Bennett, David P. [2 ,3 ]
Udalski, Andrzej [4 ]
Jung, Youn Kil [1 ]
机构：
[1] Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea
[2] NASA, Goddard Space Flight Ctr, Code 667, Greenbelt, MD 20771 USA
[3] Univ Notre Dame, Dept Phys, 225 Nieuwland Sci Hall, Notre Dame, IN 46556 USA
[4] Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland
来源：
ASTROPHYSICAL JOURNAL | 2016年 / 825卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
gravitational lensing: micro; planetary systems; BINARY; DWARF; MASS; LENS; PHOTOMETRY; PLANETS;
D O I：
10.3847/0004-637X/825/1/8
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recently, the discovery of a Venus-mass planet orbiting a brown-dwarf host in a binary system was reported from the analysis of the microlensing event OGLE-2013-BLG-0723. We reanalyze the event considering the possibility of other interpretations. From this, we find a new solution where the lens is composed of two bodies, in contrast to the three-body solution of the previous analysis. The new solution better explains the observed light curve than the previous solution with Delta chi(2) similar to 202, suggesting that the new solution is a correct model for the event. From the estimation of the physical parameters based on the new interpretation, we find that the lens system is composed of two low-mass stars with similar to 0.2M(circle dot) and similar to 0.1M(circle dot) and located at a distance of similar to 3 kpc. The fact that the physical parameters correspond to those of the most common lens population located at a distance with a large lensing probability further supports the likelihood of the new interpretation. Considering that two dramatically different solutions can approximately explain the observed light curve, the event suggests the need for carefully testing all possible lens-system geometries.
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收藏
页数：8
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