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

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.

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Item Type:	Article
Authors/Creators:	Wyrzykowski, Ł Mróz, P Rybicki, KA Gromadzki, M Kołaczkowski, Z Zieliński, M Zieliński, P Britavskiy, N Gomboc, A Sokolovsky, K Hodgkin, ST Abe, L Aldi, GF AlMannaei, A Altavilla, G Al Qasim, A Anupama, GC Awiphan, S Bachelet, E Bakış, V Baker, S Bartlett, S Bendjoya, P Benson, K Bikmaev, IF Birenbaum, G Blagorodnova, N Blanco-Cuaresma, S Boeva, S Bonanos, AZ Bozza, V Bramich, DM Bruni, I Burenin, RA Burgaz, U Butterley, T Caines, HE Caton, DB Calchi Novati, S Carrasco, JM Cassan, A Čepas, V Cropper, M Chruślińska, M Clementini, G Clerici, A Conti, D Conti, M Cross, S Cusano, F Damljanovic, G Dapergolas, A D’Ago, G de Bruijne, JHJ Dennefeld, M Dhillon, VS https://orcid.org/0000-0003-4236-9642 Dominik, M Dziedzic, J Erece, O Eselevich, MV Esenoglu, H Eyer, L Figuera Jaimes, R Fossey, SJ Galeev, AI Grebenev, SA Gupta, AC Gutaev, AG Hallakoun, N Hamanowicz, A Han, C Handzlik, B Haislip, JB Hanlon, L Hardy, LK Harrison, DL van Heerden, HJ Hoette, VL Horne, K Hudec, R Hundertmark, M Ihanec, N Irtuganov, EN Itoh, R Iwanek, P Jovanovic, MD Janulis, R Jelínek, M Jensen, E Kaczmarek, Z Katz, D Khamitov, IM Kilic, Y Klencki, J Kolb, U Kopacki, G Kouprianov, VV Kruszyńska, K Kurowski, S Latev, G Lee, C-H Leonini, S Leto, G Lewis, F Li, Z Liakos, A Littlefair, SP https://orcid.org/0000-0001-7221-855X Lu, J Manser, CJ Mao, S Maoz, D Martin-Carrillo, A Marais, JP Maskoliūnas, M Maund, JR Meintjes, PJ Melnikov, SS Ment, K Mikołajczyk, P Morrell, M Mowlavi, N Moździerski, D Murphy, D Nazarov, S Netzel, H Nesci, R Ngeow, C-C Norton, AJ Ofek, EO Pakštienė, E Palaversa, L Pandey, A Paraskeva, E Pawlak, M Penny, MT Penprase, BE Piascik, A Prieto, JL Qvam, JKT Ranc, C Rebassa-Mansergas, A Reichart, DE Reig, P Rhodes, L Rivet, J-P Rixon, G Roberts, D Rosi, P Russell, DM Zanmar Sanchez, R Scarpetta, G Seabroke, G Shappee, BJ Schmidt, R Shvartzvald, Y Sitek, M Skowron, J Śniegowska, M Snodgrass, C Soares, PS van Soelen, B Spetsieri, ZT Stankevičiūtė, A Steele, IA Street, RA Strobl, J Strubble, E Szegedi, H Tinjaca Ramirez, LM Tomasella, L Tsapras, Y Vernet, D Villanueva, S Vince, O Wambsganss, J van der Westhuizen, IP Wiersema, K Wium, D Wilson, RW Yoldas, A Zhuchkov, RY Zhukov, DG Zdanavičius, J Zoła, S Zubareva, A
Copyright, Publisher and Additional Information:	© 2019 ESO. Reproduced in accordance with the publisher's self-archiving policy.
Keywords:	stars:individual: Gaia16aye-L; gravitational lensing: micro; techniques:photometric; binaries:general
Dates:	Published: 21 January 2020 Published (online): 21 January 2020 Accepted: 10 October 2019
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Funding Information:	Funder Grant number European Commission - Horizon 2020 OPTICON - 730890 Science and Technology Facilities Council ST/R000964/1
Depositing User:	Symplectic Sheffield
Date Deposited:	03 Jul 2020 08:49
Last Modified:	03 Jul 2020 09:31
Status:	Published
Publisher:	EDP Sciences
Refereed:	Yes
Identification Number:	10.1051/0004-6361/201935097
Related URLs:	arXiv URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:162837

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

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