REANALYSES OF ANOMALOUS GRAVITATIONAL MICROLENSING EVENTS IN THE OGLE-III EARLY WARNING SYSTEM DATABASE WITH COMBINED DATA

被引：5

作者：

Jeong, J. ^{[1
]}

Park, H. ^{[1
]}

Han, C. ^{[1
]}

Gould, A. ^{[2
]}

Udalski, A. ^{[3
]}

Szymanski, M. K. ^{[3
]}

Pietrzynski, G. ^{[3
]}

Soszynski, I. ^{[3
]}

Poleski, R. ^{[2
,3
]}

Ulaczyk, K. ^{[3
]}

Wyrzykowski, L. ^{[3
,4
]}

Abe, F. ^{[5
]}

Bennett, D. P. ^{[6
]}

Bond, I. A. ^{[7
]}

Botzler, C. S. ^{[8
]}

Freeman, M. ^{[8
]}

Fukui, A. ^{[9
]}

Fukunaga, D. ^{[5
]}

Itow, Y. ^{[5
]}

Koshimoto, N. ^{[10
]}

Masuda, K. ^{[5
]}

Matsubara, Y. ^{[5
]}

Muraki, Y. ^{[5
]}

Namba, S. ^{[10
]}

Ohnishi, K. ^{[11
]}

Rattenbury, N. J. ^{[8
]}

Saito, To. ^{[12
]}

Sullivan, D. J. ^{[13
]}

Sweatman, W. L. ^{[7
]}

Sumi, T. ^{[5
]}

Suzuki, D. ^{[10
]}

Tristram, P. J. ^{[14
]}

Tsurumi, N. ^{[5
]}

Wada, K. ^{[10
]}

Yamai, N. ^{[15
]}

Yock, P. C. M. ^{[8
]}

Yonehara, A. ^{[15
]}

Albrow, M. D. ^{[16
]}

Batista, V. ^{[2
]}

Beaulieu, J. -P. ^{[17
]}

Caldwell, J. A. R. ^{[18
]}

Cassan, A. ^{[17
]}

Cole, A. ^{[18
]}

Coutures, C. ^{[17
]}

Dieters, S. ^{[17
]}

Dominik, M. ^{[19
]}

Prester, D. Dominis ^{[20
]}

Donatowicz, J. ^{[21
]}

Fouque, P. ^{[22
,23
]}

Greenhill, J. ^{[24
]}

机构：

[1] Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 361763, South Korea

[2] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[3] Univ Warsaw Observ, PL-00478 Warsaw, Poland

[4] Univ Cambridge, Inst Astron, Cambridge CB3 OHA, England

[5] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

[6] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[7] Massey Univ, Inst Informat & Math Sci, North Shore Mail Ctr, Auckland, New Zealand

[8] Univ Auckland, Dept Phys, Auckland 1001, New Zealand

[9] Natl Astron Observ Japan, Okayama Astrophys Observ, Asakuchi, Okayama 7190232, Japan

[10] Osaka Univ, Dept Earth & Space Sci, Osaka 5600043, Japan

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

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

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

[14] Mt John Univ Observ, Lake Tekapo 8770, New Zealand

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

[16] Univ Canterbury, Dept Phys & Astron, Christchurch 8020, New Zealand

[17] Univ Paris 06, CNRS UMR7095, Inst Astrophys Paris, F-75014 Paris, France

[18] McDonald Observ, Ft Davis, TX 79734 USA

[19] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[20] Univ Rijeka, Fac Arts & Sci, Dept Phys, Rijeka 51000, Croatia

[21] Vienna Univ Technol, Dept Comp, A-1040 Vienna, Austria

[22] Univ Toulouse, CNRS, UMR 5277, IRAP, F-31400 Toulouse, France

[23] Canada France Hawaii Telescope Corp, Kamuela, HI 96743 USA

[24] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia

[25] Univ Orange Free State, Fac Nat & Agr Sci, Dept Phys, ZA-9300 Bloemfontein, South Africa

[26] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[27] Niels Bohr Inst, Astron Observ, DK-2100 Copenhagen, Denmark

[28] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

[29] Perth Observ, Perth, WA 6076, Australia

[30] S African Astron Observ, ZA-7935 Observatory, South Africa

[31] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[32] Astron Rech Inst, D-69120 Heidelberg, Germany

[33] Vintage Lane Observ, Blenheim, New Zealand

[34] Craigie Observ, Craigie, WA, Australia

[35] Auckland Observ, Auckland, New Zealand

[36] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[37] Possum Observ, Patutahi, Gisbourne, New Zealand

[38] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[39] Campo Catino Austral Observ, San Pedro De Atacama, Chile

[40] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[41] Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel

[42] Ctr Backyard Astrophys, Farm Cove Observ, Auckland, New Zealand

[43] Klein Karoo Observ, Calitzdorp, South Africa

[44] Bronberg Observ, Pretoria, South Africa

[45] Kumeu Observ, Kumeu, New Zealand

[46] AUT Univ, Inst Radiophys & Space Res, Auckland, New Zealand

[47] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel

[48] Southern Stars Observ, Faaa, Tahiti, France

[49] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[50] European So Observ, D-85748 Garching, Germany

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 804卷 / 01期

基金：

欧洲研究理事会; 美国国家科学基金会; 新加坡国家研究基金会;

关键词：

binaries: close; gravitational lensing: micro; BINARY LENSES; GALACTIC BULGE; EWS DATABASE; SEARCH; MASS; STELLAR; LIMITS;

D O I：

10.1088/0004-637X/804/1/38

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We reanalyze microlensing events in the published list of anomalous events that were observed from the Optical Gravitational Lensing Experiment (OGLE) lensing survey conducted during the 2004-2008 period. In order to check the existence of possible degenerate solutions and extract extra information, we conduct analyses based on combined data from other survey and follow-up observation and consider higher-order effects. Among the analyzed events, we present analyses of eight events for which either new solutions are identified or additional information is obtained. We find that the previous binary-source interpretations of five events are better interpreted by binary-lens models. These events include OGLE-2006-BLG-238, OGLE-2007-BLG-159, OGLE-2007-BLG-491, OGLE-2008-BLG-143, and OGLE-2008-BLG-210. With additional data covering caustic crossings, we detect finite-source effects for six events including OGLE-2006-BLG-215, OGLE-2006-BLG-238, OGLE-2006-BLG-450, OGLE-2008-BLG-143, OGLE-2008-BLG-210, and OGLE-2008-BLG-513. Among them, we are able to measure the Einstein radii of three events for which multi-band data are available. These events are OGLE-2006-BLG-238, OGLE-2008-BLG-210, and OGLE-2008-BLG-513. For OGLE-2008-BLG-143, we detect higher-order effects induced by the changes of the observer's position caused by the orbital motion of the Earth around the Sun. In addition, we present degenerate solutions resulting from the known close/wide or ecliptic degeneracy. Finally, we note that the masses of the binary companions of the lenses of OGLE-2006-BLG-450 and OGLE-2008-BLG-210 are in the brown-dwarf regime.

引用

页数：11

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