First Resolution of Microlensed Images

被引：52

作者：

Dong, Subo ^{[1
]}

Merand, A. ^{[2
]}

Delplancke-Stroebele, F. ^{[2
]}

Gould, Andrew ^{[3
,4
,5
]}

Chen, Ping ^{[1
]}

Post, R. ^{[6
]}

Kochanek, C. S. ^{[5
,7
]}

Stanek, K. Z. ^{[5
,7
]}

Christie, G. W. ^{[8
]}

Mutel, Robert ^{[9
]}

Natusch, T. ^{[10
]}

Holoien, T. W. -S. ^{[11
]}

Prieto, J. L. ^{[12
,13
]}

Shappee, B. J. ^{[14
]}

Thompson, Todd A. ^{[5
,7
]}

机构：

[1] Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China

[2] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[3] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[4] Korea Astron & Space Sci Inst, Daejon 305348, South Korea

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

[6] Post Observ, Lexington, MA 02421 USA

[7] Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, 191 W Woodruff Ave, Columbus, OH 43210 USA

[8] Auckland Observ, Box 24180, Auckland, New Zealand

[9] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[10] AUT Univ, Inst Radio Astron & Space Res, Auckland, New Zealand

[11] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

[12] Univ Diego Portales, Fac Ingn & Ciencias, Nucleo Astron, Ave Ejercito 441, Santiago, Chile

[13] Millennium Inst Astrophys, Santiago, Chile

[14] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 871卷 / 01期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

gravitational lensing: micro; techniques: interferometric; MASS; EVENTS; DISCOVERY; CLOSURE; BRIGHT; STARS;

D O I：

10.3847/1538-4357/aaeffb

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We employ Very Large Telescope Interferometer GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation Delta theta(-,+) = 3.78 +/- 0.05 mas, and hence the Einstein radius theta(E) = 1.87 +/- 0.03 mas, are precise. This demonstrates the robustness of the method, provided that the source is bright enough for GRAVITY (K less than or similar to 10.5) and the image separation is of order of or larger than the fringe spacing. When theta(E) is combined with a measurement of the "microlens parallax" pi(E), the two will together yield the lens mass and lens-source relative parallax and proper motion. Because the source parallax and proper motion are well measured by Gaia, this means that the lens characteristics will be fully determined, whether or not it proves to be luminous. This method can be a powerful probe of dark, isolated objects, which are otherwise quite difficult to identify, much less characterize. Our measurement contradicts Einstein's prediction that "the luminous circle [i.e., microlensed image] cannot be distinguished" from a star.

引用

页数：11

共 49 条

[1] First light for GRAVITY: Phase referencing optical interferometry for the Very Large Telescope Interferometer [J].

Abuter, R. ;

Accardo, M. ;

Amorim, A. ;

Anugu, N. ;

Avila, G. ;

Azouaoui, N. ;

Benisty, M. ;

Berger, J. P. ;

Blind, N. ;

Bonnet, H. ;

Bourget, P. ;

Brandner, W. ;

Brast, R. ;

Buron, A. ;

Burtscher, L. ;

Cassaing, F. ;

Chapron, F. ;

Choquet, E. ;

Clenet, Y. ;

Collin, C. ;

du Foresto, V. Coude ;

de Wit, W. ;

de Zeeuw, P. T. ;

Deen, C. ;

Delplancke-Stroebele, F. ;

Dembet, R. ;

Derie, F. ;

Dexter, J. ;

Duvert, G. ;

Ebert, M. ;

Eckart, A. ;

Eisenhauer, F. ;

Esselborn, M. ;

Fedou, P. ;

Finger, G. ;

Garcia, P. ;

Dabo, C. E. Garcia ;

Lopez, R. Garcia ;

Gendron, E. ;

Genzel, R. ;

Gillessen, S. ;

Gonte, F. ;

Gordo, P. ;

Grould, M. ;

Groezinger, U. ;

Guieu, S. ;

Haguenauer, P. ;

Hans, O. ;

Haubois, X. ;

Haug, M. .

ASTRONOMY & ASTROPHYSICS, 2017, 602

[2] CONFIRMATION OF THE OGLE-2005-BLG-169 PLANET SIGNATURE AND ITS CHARACTERISTICS WITH LENS-SOURCE PROPER MOTION DETECTION [J].

Batista, V. ;

Beaulieu, J. -P. ;

Bennett, D. P. ;

Gould, A. ;

Marquette, J. -B. ;

Fukui, A. ;

Bhattacharya, A. .

ASTROPHYSICAL JOURNAL, 2015, 808 (02)

[3] Astrometric microlensing with the GAIA satellite [J].

Belokurov, VA ;

Evans, NW .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 331 (03) :649-665

[4]

BENNETT DP, 2015, ASTROPHYS J, V808

[5]

Bourges L., 2013, ASPRO 2 ASTRONOMICAL

[6] Predicted microlensing events from analysis of Gaia Data Release 2 [J].

Bramich, D. M. .

ASTRONOMY & ASTROPHYSICS, 2018, 618

[7] Gaia Data Release 2. Summary of the contents and survey properties [J].

Brown, A. G. A. ;

Vallenari, A. ;

Prusti, T. ;

de Bruijne, J. H. J. ;

Babusiaux, C. ;

Bailer-Jones, C. A. L. ;

Biermann, M. ;

Evans, D. W. ;

Eyer, L. ;

Jansen, F. ;

Jordi, C. ;

Klioner, S. A. ;

Lammers, U. ;

Lindegren, L. ;

Luri, X. ;

Mignard, F. ;

Panem, C. ;

Pourbaix, D. ;

Randich, S. ;

Sartoretti, P. ;

Siddiqui, H. I. ;

Soubiran, C. ;

van Leeuwen, F. ;

Walton, N. A. ;

Arenou, F. ;

Bastian, U. ;

Cropper, M. ;

Drimmel, R. ;

Katz, D. ;

Lattanzi, M. G. ;

Bakker, J. ;

Cacciari, C. ;

Castaneda, J. ;

Chaoul, L. ;

Cheek, N. ;

De Angeli, F. ;

Fabricius, C. ;

Guerra, R. ;

Holl, B. ;

Masana, E. ;

Messineo, R. ;

Mowlavi, N. ;

Nienartowicz, K. ;

Panuzzo, P. ;

Portell, J. ;

Riello, M. ;

Seabroke, G. M. ;

Tanga, P. ;

Thevenin, F. ;

Gracia-Abril, G. .

ASTRONOMY & ASTROPHYSICS, 2018, 616

[8] Interferometric observation of microlensing events [J].

Cassan, Arnaud ;

Ranc, Clement .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 458 (02) :2074-2079

[9]

Cheli A., 2016, A A, V589, P112

[10] Bringing closure to microlensing mass measurement [J].

Dalal, N ;

Lane, BF .

ASTROPHYSICAL JOURNAL, 2003, 589 (01) :199-209

← 1 2 3 4 5 →