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Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye

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dc.contributor.author Wyrzykowski, L
dc.contributor.author Mroz, P
dc.contributor.author Rybicki, K. A
dc.contributor.author Gromadzki, M
dc.contributor.author Kolaczkowski, Z
dc.contributor.author Zielinski, M
dc.contributor.author Zielinski, P
dc.contributor.author Britavskiy, N
dc.contributor.author Gomboc, A
dc.contributor.author Sokolovsky, K
dc.contributor.author Hodgkin, S. T
dc.contributor.author Abe, L
dc.contributor.author Aldi, G. F
dc.contributor.author AlMannaei, A
dc.contributor.author Altavilla, G
dc.contributor.author Al Qasim, A
dc.contributor.author Anupama, G. C
dc.contributor.author Awiphan, S
dc.contributor.author Bachelet, E
dc.contributor.author Bakış, V
dc.contributor.author Baker, S
dc.contributor.author Bartlett, S
dc.contributor.author Bendjoya, P
dc.contributor.author Benson, K
dc.contributor.author Bikmaev, I. F
dc.contributor.author Birenbaum, G
dc.contributor.author Blagorodnova, N
dc.contributor.author Blanco-Cuaresma, S
dc.contributor.author Boeva, S
dc.contributor.author Bonanos, A. Z
dc.contributor.author Bozza, V
dc.contributor.author Bramich, D. M
dc.contributor.author Brun, I
dc.contributor.author Burenin, R. A
dc.contributor.author Burgaz, U
dc.contributor.author Butterley, T
dc.contributor.author Caines, H. E
dc.contributor.author Caton, D. B
dc.contributor.author Calchi Novati, S
dc.contributor.author Carrasco, J. M
dc.contributor.author Cassan, A
dc.contributor.author Cepas, V
dc.contributor.author Cropper, M
dc.contributor.author Chruslinska, M
dc.contributor.author Clementini, G
dc.contributor.author Clerici, A
dc.contributor.author Conti, D
dc.contributor.author Conti, M
dc.contributor.author Cross, S
dc.contributor.author Cusano, F
dc.contributor.author and 134 co-authors
dc.date.accessioned 2020-11-26T15:38:25Z
dc.date.available 2020-11-26T15:38:25Z
dc.date.issued 2020-01
dc.identifier.citation Astronomy & Astrophysics, Vol. 633, A98 en_US
dc.identifier.issn 1432-0746
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7407
dc.description Open Access © ESO https://doi.org/10.1051/0004-6361/201935097 en_US
dc.description.abstract Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the Gaia space mission. Its light curve exhibited five distinct brightening episodes, reaching up to I = 12 mag, and it was covered in great detail with almost 25 000 data points gathered by a network of telescopes. We present the photometric and spectroscopic follow-up covering 500 days of the event evolution. We employed a full Keplerian binary orbit microlensing model combined with the motion of Earth and Gaia around the Sun to reproduce the complex light curve. The photometric data allowed us to solve the microlensing event entirely and to derive the complete and unique set of orbital parameters of the binary lensing system. We also report on the detection of the first-ever microlensing space-parallax between the Earth and Gaia located at L2. The properties of the binary system were derived from microlensing parameters, and we found that the system is composed of two main-sequence stars with masses 0.57 ± 0.05 M⊙ and 0.36 ± 0.03 M⊙ at 780 pc, with an orbital period of 2.88 years and an eccentricity of 0.30. We also predict the astrometric microlensing signal for this binary lens as it will be seen by Gaia as well as the radial velocity curve for the binary system. Events such as Gaia16aye indicate the potential for the microlensing method of probing the mass function of dark objects, including black holes, in directions other than that of the Galactic bulge. This case also emphasises the importance of long-term time-domain coordinated observations that can be made with a network of heterogeneous telescopes. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject gravitational lensing: micro en_US
dc.subject techniques: photometric en_US
dc.subject binaries: general en_US
dc.subject stars: individual: Gaia16aye-L en_US
dc.title Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye en_US
dc.type Article en_US


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