OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED by SIMULTANEOUS GROUND-BASED and SPACE-BASED OBSERVATIONS

Han, C.; Udalski, A.; Gould, A.; Zhu, W.; Street, R. A.; Yee, J. C.; Beichman, C.; Bryden, C.; Novati, S. C.; Carey, S.; Fausnaugh, M.; Gaudi, B. S.; Henderson, C. B.; Shvartzvald, Y.; Wibking, B.; Szymański, M. K.; Soszyński, I.; Skowron, J.; Mróz, P.; Poleski, R.; Pietrukowicz, P.; Kozłowski, S.; Ulaczyk, K.; Wyrzykowski, Ł.; Pawlak, M.; Tsapras, Y.; Hundertmark, M.; Bachelet, E.; Dominik, M.; Bramich, D. M.; Cassan, A.; Jaimes, R. F.; Horne, K.; Ranc, C.; Schmidt, R.; Snodgrass, C.; Wambsganss, J.; Steele, I. A.; Menzies, J.; Mao, S.; Bozza, V.; Jørgensen, U. G.; Alsubai, K. A.; Ciceri, S.; D'Ago, G.; Haugbølle, T.; Hessman, F. V.; Hinse, T. C.; Juncher, D.; Korhonen, H.; Mancini, L.; Popovas, A.; Rabus, M.; Rahvar, S.; Scarpetta, G.; Skottfelt, J.; Southworth, J.; Starkey, D.; Surdej, Jean; Wertz, O.; Zarucki, M.; Pogge, R. W.; DePoy, D. L.

doi:10.3847/0004-637X/828/1/53

Article (Scientific journals)

OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED by SIMULTANEOUS GROUND-BASED and SPACE-BASED OBSERVATIONS

Han, C.; Udalski, A.; Gould, A. et al.

2016 • In Astrophysical Journal, 828 (1)

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https://hdl.handle.net/2268/218118

DOI
10.3847/0004-637X/828/1/53

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Keywords :

Gravitational Lensing; Microlensing

Abstract :

[en] We present a combined analysis of the observations of the gravitational microlensing event OGLE-2015-BLG-0479 taken both from the ground and by the Spitzer Space Telescope. The light curves seen from the ground and from space exhibit a time offset of ∼13 days between the caustic spikes, indicating that the relative lens-source positions seen from the two places are displaced by parallax effects. From modeling the light curves, we measure the space-based microlens parallax. Combined with the angular Einstein radius measured by analyzing the caustic crossings, we determine the mass and distance of the lens. We find that the lens is a binary composed of two G-type stars with masses of ∼1.0 M⊙ and ∼0.9 M⊙ located at a distance of ∼3 kpc. In addition, we are able to constrain the complete orbital parameters of the lens thanks to the precise measurement of the microlens parallax derived from the joint analysis. In contrast to the binary event OGLE-2014-BLG-1050, which was also observed by Spitzer, we find that the interpretation of OGLE-2015-BLG-0479 does not suffer from the degeneracy between (±, ±) and (±, ∓) solutions, confirming that the four-fold parallax degeneracy in single-lens events collapses into the two-fold degeneracy for the general case of binary-lens events. The location of the blend in the color-magnitude diagram is consistent with the lens properties, suggesting that the blend is the lens itself. The blend is bright enough for spectroscopy and thus this possibility can be checked from future follow-up observations. © 2016. The American Astronomical Society. All rights reserved.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Han, C.; Department of Physics, Chungbuk National University, Cheongju, South Korea

Udalski, A.; Warsaw University Observatory, Al. Ujazdowskie 4, Warszawa, Poland

Gould, A.; Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH, United States, Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany

Zhu, W.; Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH, United States

Street, R. A.; School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, United Kingdom

Yee, J. C.; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, United States

Beichman, C.; NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena, CA, United States

Bryden, C.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, United States

Novati, S. C.; NASA Exoplanet Science Institute, MS 100-22, California Institute of Technology, Pasadena, CA, United States, Dipartimento di Fisica E. R. Caianiello, Uńiversitá di Salerno, Via Giovanni Paolo II, Fisciano (SA), Italy, Istituto Internazionale per Gli Alti Studi Scientifici (IIASS), Via G. Pellegrino 19, Vietri Sul Mare (SA), Italy

Carey, S.; Spitzer Science Center, MS 220-6, California Institute of Technology, Pasadena, CA, United States

More authors (53 more)

Language :

English

Title :

OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED by SIMULTANEOUS GROUND-BASED and SPACE-BASED OBSERVATIONS

Publication date :

2016

Journal title :

Astrophysical Journal

ISSN :

0004-637X

eISSN :

1538-4357

Publisher :

Institute of Physics Publishing

Volume :

828

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Creative Research Initiative Program (2009-0081561)

Funders :

NRF - National Research Foundation of Korea [KR]
National Science Centre
CIT - California Institute of Technology [US-CA] [US-CA]
NASA - National Aeronautics and Space Administration [US-DC] [US-DC]

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