OGLE-2013-BLG-1761Lb: A Massive Planet around an M/K Dwarf

被引：7

作者：

Hirao, Y. ^{[1
,17
]}

Udalski, A. ^{[2
,18
]}

Sumi, T. ^{[1
,17
]}

Bennett, D. P. ^{[3
,4
,17
]}

Koshimoto, N. ^{[1
,17
]}

Bond, I. A. ^{[5
,17
]}

Rattenbury, N. J. ^{[6
,17
]}

Suzuki, D. ^{[4
,17
]}

Abe, F. ^{[7
]}

Asakura, Y. ^{[7
]}

Barry, R. K. ^{[8
]}

Bhattacharya, A. ^{[3
]}

Donachie, M. ^{[6
]}

Evans, P. ^{[6
]}

Fukui, A. ^{[9
]}

Itow, Y. ^{[7
]}

Li, M. C. A. ^{[6
]}

Ling, C. H. ^{[5
]}

Masuda, K. ^{[7
]}

Matsubara, Y. ^{[7
]}

Matsuo, T. ^{[1
]}

Muraki, Y. ^{[7
]}

Nagakane, M. ^{[1
]}

Ohnishi, K. ^{[10
]}

Ranc, C. ^{[4
]}

Saito, To. ^{[11
]}

Sharan, A. ^{[6
]}

Shibai, H. ^{[1
]}

Sullivan, D. J. ^{[12
]}

Tristram, P. J. ^{[13
]}

Yamada, T. ^{[1
,14
]}

Yonehara, A. ^{[14
]}

Poleski, R. ^{[15
]}

Skowron, J. ^{[2
]}

Mroz, P. ^{[2
]}

Szymanski, M. K. ^{[2
]}

Kozlowski, S. ^{[2
]}

Pietrukowicz, P. ^{[2
]}

Soszynski, I. ^{[2
]}

Wyrzykowski, L. ^{[2
]}

Ulaczyk, K. ^{[16
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan

[2] Univ Warsaw Observ, A1 Ujazdowski 4, PL-00478 Warsaw, Poland

[3] Univ Notre Dame, Dept Phys, Norte Dame, IN 46556 USA

[4] NASA, Goddard Space Flight Ctr, Lab Exoplanets & Stellar Astrophys, Greenbelt, MD 20771 USA

[5] Massey Univ, North Shore Mail Ctr, Inst Informat & Math Sci, Private Bag 102-904, Auckland, New Zealand

[6] Univ Auckland, Dept Phys, Private Bag 92019, Auckland, New Zealand

[7] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan

[8] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[9] Natl Astron Observ Japan, Okayama Astrophys Observ, 3037-5 Honjo, Okayama 7190232, Japan

[10] Nagano Natl Coll Technol, Nagano 3818550, Japan

[11] Tokyo Metropolitan Coll Aeronaut, Tokyo 1168523, Japan

[12] Victoria Univ, Sch Chem & Phys Sci, Wellington, New Zealand

[13] Univ Canterbury Mt John Observ, POB 56, Lake Tekapo 8770, New Zealand

[14] Kyoto Sangyo Univ, Fac Sci, Dept Phys, Kyoto 6038555, Japan

[15] Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA

[16] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[17] Microlensing Observat Astrophys MOA Collaborat, Gottingen, Germany

[18] Opt Gravitat Lens Expt OGLE Collaborat, Warsaw, Poland

来源：

ASTRONOMICAL JOURNAL | 2017年 / 154卷 / 01期

关键词：

gravitational lensing: micro; planetary systems; GALACTIC BULGE; MICROLENSING SURVEY; COLD NEPTUNE; DISCOVERY; STAR; CONFIRMATION; EXTINCTION; FREQUENCY; EVOLUTION; SYSTEMS;

D O I：

10.3847/1538-3881/aa73da

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery and the analysis of the planetary microlensing event, OGLE-2013-BLG-1761. There are some degenerate solutions in this event because the planetary anomaly is only sparsely sampled. However, the detailed light-curve analysis ruled out all stellar binary models and shows the lens to be a planetary system. There is the so-called close/wide degeneracy in the solutions with the planet/host mass ratio of q similar to (7.0 +/- 2.0)x10(-3) and q similar to (8.1 +/- 2.6)x10(-3) with the projected separation in Einstein radius units of s = 0.95 (close) and s = 1.18 (wide), respectively. The microlens parallax effect is not detected, but the finite source effect is detected. Our Bayesian analysis indicates that the lens system is located D-L = 6.9(-1.2)(+1.0) kpc away from us and the host star is an M/K dwarf with a mass of M-L = 0.33(-0.19)(+0.32) M-circle dot orbited by a super-Jupiter mass planet with a mass of m(P) = 2.7(-1.5)(+2.5) M-Jup at the projected separation of a(perpendicular to) = 1.8(-0.5)(+0.5) au. The preference of the large lens distance in the Bayesian analysis is due to the relatively large observed source star radius. The distance and other physical parameters may be constrained by the future high-resolution imaging by large ground telescopes or HST. If the estimated lens distance is correct, then. this planet provides another sample for testing the claimed deficit of planets in the Galactic bulge.

引用

页数：8

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