KFU. Card publication. Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye

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FEDERAL UNIVERSITY

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FULL ORBITAL SOLUTION FOR THE BINARY SYSTEM IN THE NORTHERN GALACTIC DISC MICROLENSING EVENT GAIA16AYE

Form of presentation

Articles in international journals and collections

Year of publication

2020

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Authors, employees of KFU

Bikmaev Ilfan Fyaritovich, author

Gutaev Aleksey Gennadevich, author

Bibliographic description in the original language

Wyrzykowski L., Mroz P., Rybicki K. A., Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye//ASTRONOMY & ASTROPHYSICS. - 2020. - Vol.633, Is.. - Art. �A98.

Annotation

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.

Keywords

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The name of the journal

ASTRONOMY & ASTROPHYSICS

URL

https://www.aanda.org/articles/aa/full_html/2020/01/aa35097-19/aa35097-19.html

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=244721&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Bikmaev Ilfan Fyaritovich	ru_RU
dc.contributor.author	Gutaev Aleksey Gennadevich	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Wyrzykowski L., Mroz P., Rybicki K. A., Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye//ASTRONOMY & ASTROPHYSICS. - 2020. - Vol.633, Is.. - Art. �A98.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=244721&p_lang=2	ru_RU
dc.description.abstract	ASTRONOMY & ASTROPHYSICS	ru_RU
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.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	��	ru_RU
dc.subject	��	ru_RU
dc.subject	��	ru_RU
dc.title	Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye	ru_RU
dc.type	Articles in international journals and collections	ru_RU