Full orbital solution for the binary system in the Northern Galactic Disk microlensing event Gaia16aye

Ł. Wyrzykowski; P. Mróz; K. A. Rybicki; M. Gromadzki; Z. Kołaczkowski; M. Zieliński; P. Zieliński; N. Britavskiy; A. Gomboc; K. Sokolovsky; S. T. Hodgkin; L. Abe; G. F. Aldi; A. Almannaei; G. Altavilla; A. Al Qasim; G. C. Anupama; S. Awiphan; E. Bachelet; V. Bakış; S. Baker; S. Bartlett; P. Bendjoya; K. Benson; I. F. Bikmaev; G. Birenbaum; N. Blagorodnova; S. Blanco-Cuaresma; S. Boeva; A. Z. Bonanos; V. Bozza; D. M. Bramich; I. Bruni; R. A. Burenin; U. Burgaz; T. Butterley; H. E. Caines; D. B. Caton; S. Calchi Novati; J. M. Carrasco; A. Cassan; V. Čepas; M. Cropper; M. Chruślińska; G. Clementini; A. Clerici; D. Conti; M. Conti; S. Cross; F. Cusano; G. Damljanovic; A. Dapergolas; G. D’ago; J. H. J. De Bruijne; M. Dennefeld; V. S. Dhillon; M. Dominik; J. Dziedzic; O. Erece; M. V. Eselevich; H. Esenoglu; L. Eyer; R. Figuera Jaimes; S. J. Fossey; A. I. Galeev; S. A. Grebenev; A. C. Gupta; A. G. Gutaev; N. Hallakoun; A. Hamanowicz; C. Han; B. Handzlik; J. B. Haislip; L. Hanlon; L. K. Hardy; D. L. Harrison; H. J. Van Heerden; V. L. Hoette; K. Horne; R. Hudec; M. Hundertmark; N. Ihanec; E. N. Irtuganov; R. Itoh; P. Iwanek; M. D. Jovanovic; R. Janulis; M. Jelínek; E. Jensen; Z. Kaczmarek; D. Katz; I. M. Khamitov; Y. Kilic; J. Klencki; U. Kolb; G. Kopacki; V. V. Kouprianov; K. Kruszyńska; S. Kurowski; G. Latev; C.-H. Lee; S. Leonini; G. Leto; F. Lewis; Z. Li; A. Liakos; S. P. Littlefair; J. Lu; C. J. Manser; S. Mao; D. Maoz; A. Martin-Carrillo; J. P. Marais; M. Maskoliūnas; J. R. Maund; P. J. Meintjes; S. S. Melnikov; K. Ment; P. Mikołajczyk; M. Morrell; N. Mowlavi; D. Moździerski; D. Murphy; S. Nazarov; H. Netzel; R. Nesci; C.-C. Ngeow; A. J. Norton; E. O. Ofek; E. Pakštienė; L. Palaversa; A. Pandey; E. Paraskeva; M. Pawlak; M. T. Penny; B. E. Penprase; A. Piascik; J. L. Prieto; J. K. T. Qvam; C. Ranc; A. Rebassa-Mansergas; D. E. Reichart; P. Reig; L. Rhodes; J.-P. Rivet; G. Rixon; D. Roberts; P. Rosi; D. M. Russell; R. Zanmar Sanchez; G. Scarpetta; G. Seabroke; B. J. Shappee; R. Schmidt; Y. Shvartzvald; M. Sitek; J. Skowron; M. Śniegowska; C. Snodgrass; P. S. Soares; B. Van Soelen; Z. T. Spetsieri; A. Stankevičiūtė; I. A. Steele; R. A. Street; J. Strobl; E. Strubble; H. Szegedi; L. M. Tinjaca Ramirez; L. Tomasella; Y. Tsapras; D. Vernet; S. Villanueva; O. Vince; J. Wambsganss; I. P. Van Der Westhuizen; K. Wiersema; D. Wium; R. W. Wilson; A. Yoldas; R. Ya. Zhuchkov; D. G. Zhukov; J. Zdanavičius; S. Zoła; A. Zubareva

doi:10.1051/0004-6361/201935097

Full orbital solution for the binary system in the Northern Galactic Disk microlensing event Gaia16aye

Ł. Wyrzykowski, P. Mróz, K. A. Rybicki, M. Gromadzki, Z. Kołaczkowski, M. Zieliński, P. Zieliński, N. Britavskiy, A. Gomboc, K. Sokolovsky, S. T. Hodgkin, L. Abe, G. F. Aldi, A. Almannaei, G. Altavilla, A. Al Qasim, G. C. Anupama, S. Awiphan, E. Bachelet, V. BakışS. Baker, S. Bartlett, P. Bendjoya, K. Benson, I. F. Bikmaev, G. Birenbaum, N. Blagorodnova, S. Blanco-Cuaresma, S. Boeva, A. Z. Bonanos, V. Bozza, D. M. Bramich, I. Bruni, R. A. Burenin, U. Burgaz, T. Butterley, H. E. Caines, D. B. Caton, S. Calchi Novati, J. M. Carrasco, A. Cassan, V. Čepas, M. Cropper, M. Chruślińska, G. Clementini, A. Clerici, D. Conti, M. Conti, S. Cross, F. Cusano, G. Damljanovic, A. Dapergolas, G. D’ago, J. H. J. De Bruijne, M. Dennefeld, V. S. Dhillon, M. Dominik, J. Dziedzic, O. Erece, M. V. Eselevich, H. Esenoglu, L. Eyer, R. Figuera Jaimes, S. J. Fossey, A. I. Galeev, S. A. Grebenev, A. C. Gupta, A. G. Gutaev, N. Hallakoun, A. Hamanowicz, C. Han, B. Handzlik, J. B. Haislip, L. Hanlon, L. K. Hardy, D. L. Harrison, H. J. Van Heerden, V. L. Hoette, K. Horne, R. Hudec, M. Hundertmark, N. Ihanec, E. N. Irtuganov, R. Itoh, P. Iwanek, M. D. Jovanovic, R. Janulis, M. Jelínek, E. Jensen, Z. Kaczmarek, D. Katz, I. M. Khamitov, Y. Kilic, J. Klencki, U. Kolb, G. Kopacki, V. V. Kouprianov, K. Kruszyńska, S. Kurowski, G. Latev, C.-H. Lee, S. Leonini, G. Leto, F. Lewis, Z. Li, A. Liakos, S. P. Littlefair, J. Lu, C. J. Manser, S. Mao, D. Maoz, A. Martin-Carrillo, J. P. Marais, M. Maskoliūnas, J. R. Maund, P. J. Meintjes, S. S. Melnikov, K. Ment, P. Mikołajczyk, M. Morrell, N. Mowlavi, D. Moździerski, D. Murphy, S. Nazarov, H. Netzel, R. Nesci, C.-C. Ngeow, A. J. Norton, E. O. Ofek, E. Pakštienė, L. Palaversa, A. Pandey, E. Paraskeva, M. Pawlak, M. T. Penny, B. E. Penprase, A. Piascik, J. L. Prieto, J. K. T. Qvam, C. Ranc, A. Rebassa-Mansergas, D. E. Reichart, P. Reig, L. Rhodes, J.-P. Rivet, G. Rixon, D. Roberts, P. Rosi, D. M. Russell, R. Zanmar Sanchez, G. Scarpetta, G. Seabroke, B. J. Shappee, R. Schmidt, Y. Shvartzvald, M. Sitek, J. Skowron, M. Śniegowska, C. Snodgrass, P. S. Soares, B. Van Soelen, Z. T. Spetsieri, A. Stankevičiūtė, I. A. Steele, R. A. Street, J. Strobl, E. Strubble, H. Szegedi, L. M. Tinjaca Ramirez, L. Tomasella, Y. Tsapras, D. Vernet, S. Villanueva, O. Vince, J. Wambsganss, I. P. Van Der Westhuizen, K. Wiersema, D. Wium, R. W. Wilson, A. Yoldas, R. Ya. Zhuchkov, D. G. Zhukov, J. Zdanavičius, S. Zoła, A. Zubareva

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	A98
Number of pages	21
Journal	Astronomy & Astrophysics
Volume	633
Early online date	21 Jan 2020
DOIs	https://doi.org/10.1051/0004-6361/201935097
Publication status	Published - Jan 2020

Keywords

Stars: individual: Gaia16aye
Gravitational lensing: micro
Techniques: photometric
Binaries: general

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10.1051/0004-6361/201935097

papGaia16aye-review3
Copyright © 2019 ESO. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://www.aanda.org/
Accepted author manuscript, 7.3 MB

OPTICON - H2020: H2020 OPTICON
Dominik, M. (PI)
European Commission
1/01/17 → 31/12/20
Project: Standard
Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard

Cite this

Wyrzykowski, Ł., Mróz, P., Rybicki, K. A., Gromadzki, M., Kołaczkowski, Z., Zieliński, M., Zieliński, P., Britavskiy, N., Gomboc, A., Sokolovsky, K., Hodgkin, S. T., Abe, L., Aldi, G. F., Almannaei, A., Altavilla, G., Al Qasim, A., Anupama, G. C., Awiphan, S., Bachelet, E., ... Zubareva, A. (2020). Full orbital solution for the binary system in the Northern Galactic Disk microlensing event Gaia16aye. Astronomy & Astrophysics, 633, Article A98. https://doi.org/10.1051/0004-6361/201935097

@article{f6837759efe343deb794a70979d40427,

title = "Full orbital solution for the binary system in the Northern Galactic Disk 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.",

keywords = "Stars: individual: Gaia16aye, Gravitational lensing: micro, Techniques: photometric, Binaries: general",

author = "{\L}. Wyrzykowski and P. Mr{\'o}z and Rybicki, {K. A.} and M. Gromadzki and Z. Ko{\l}aczkowski and M. Zieli{\'n}ski and P. Zieli{\'n}ski and N. Britavskiy and A. Gomboc and K. Sokolovsky and Hodgkin, {S. T.} and L. Abe and Aldi, {G. F.} and A. Almannaei and G. Altavilla and {Al Qasim}, A. and Anupama, {G. C.} and S. Awiphan and E. Bachelet and V. Bakı{\c s} and S. Baker and S. Bartlett and P. Bendjoya and K. Benson and Bikmaev, {I. F.} and G. Birenbaum and N. Blagorodnova and S. Blanco-Cuaresma and S. Boeva and Bonanos, {A. Z.} and V. Bozza and Bramich, {D. M.} and I. Bruni and Burenin, {R. A.} and U. Burgaz and T. Butterley and Caines, {H. E.} and Caton, {D. B.} and {Calchi Novati}, S. and Carrasco, {J. M.} and A. Cassan and V. {\v C}epas and M. Cropper and M. Chru{\'s}li{\'n}ska and G. Clementini and A. Clerici and D. Conti and M. Conti and S. Cross and F. Cusano and G. Damljanovic and A. Dapergolas and G. D{\textquoteright}ago and {De Bruijne}, {J. H. J.} and M. Dennefeld and Dhillon, {V. S.} and M. Dominik and J. Dziedzic and O. Erece and Eselevich, {M. V.} and H. Esenoglu and L. Eyer and {Figuera Jaimes}, R. and Fossey, {S. J.} and Galeev, {A. I.} and Grebenev, {S. A.} and Gupta, {A. C.} and Gutaev, {A. G.} and N. Hallakoun and A. Hamanowicz and C. Han and B. Handzlik and Haislip, {J. B.} and L. Hanlon and Hardy, {L. K.} and Harrison, {D. L.} and {Van Heerden}, {H. J.} and Hoette, {V. L.} and K. Horne and R. Hudec and M. Hundertmark and N. Ihanec and Irtuganov, {E. N.} and R. Itoh and P. Iwanek and Jovanovic, {M. D.} and R. Janulis and M. Jel{\'i}nek and E. Jensen and Z. Kaczmarek and D. Katz and Khamitov, {I. M.} and Y. Kilic and J. Klencki and U. Kolb and G. Kopacki and Kouprianov, {V. V.} and K. Kruszy{\'n}ska and S. Kurowski and G. Latev and C.-H. Lee and S. Leonini and G. Leto and F. Lewis and Z. Li and A. Liakos and Littlefair, {S. P.} and J. Lu and Manser, {C. J.} and S. Mao and D. Maoz and A. Martin-Carrillo and Marais, {J. P.} and M. Maskoliūnas and Maund, {J. R.} and Meintjes, {P. J.} and Melnikov, {S. S.} and K. Ment and P. Miko{\l}ajczyk and M. Morrell and N. Mowlavi and D. Mo{\'z}dzierski and D. Murphy and S. Nazarov and H. Netzel and R. Nesci and C.-C. Ngeow and Norton, {A. J.} and Ofek, {E. O.} and E. Pak{\v s}tienė and L. Palaversa and A. Pandey and E. Paraskeva and M. Pawlak and Penny, {M. T.} and Penprase, {B. E.} and A. Piascik and Prieto, {J. L.} and Qvam, {J. K. T.} and C. Ranc and A. Rebassa-Mansergas and Reichart, {D. E.} and P. Reig and L. Rhodes and J.-P. Rivet and G. Rixon and D. Roberts and P. Rosi and Russell, {D. M.} and {Zanmar Sanchez}, R. and G. Scarpetta and G. Seabroke and Shappee, {B. J.} and R. Schmidt and Y. Shvartzvald and M. Sitek and J. Skowron and M. {\'S}niegowska and C. Snodgrass and Soares, {P. S.} and {Van Soelen}, B. and Spetsieri, {Z. T.} and A. Stankevi{\v c}iūtė and Steele, {I. A.} and Street, {R. A.} and J. Strobl and E. Strubble and H. Szegedi and {Tinjaca Ramirez}, {L. M.} and L. Tomasella and Y. Tsapras and D. Vernet and S. Villanueva and O. Vince and J. Wambsganss and {Van Der Westhuizen}, {I. P.} and K. Wiersema and D. Wium and Wilson, {R. W.} and A. Yoldas and Zhuchkov, {R. Ya.} and Zhukov, {D. G.} and J. Zdanavi{\v c}ius and S. Zo{\l}a and A. Zubareva",

note = "Funding: UK STFC consolidated grant ST/M001296/1 (KH); European Commission H2020 OPTICON grant 730890 (OPTICON) (MD).",

year = "2020",

month = jan,

doi = "10.1051/0004-6361/201935097",

language = "English",

volume = "633",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

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, 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, 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 2020, 'Full orbital solution for the binary system in the Northern Galactic Disk microlensing event Gaia16aye', Astronomy & Astrophysics, vol. 633, A98. https://doi.org/10.1051/0004-6361/201935097

TY - JOUR

T1 - Full orbital solution for the binary system in the Northern Galactic Disk microlensing event Gaia16aye

AU - Wyrzykowski, Ł.

AU - Mróz, P.

AU - Rybicki, K. A.

AU - Gromadzki, M.

AU - Kołaczkowski, Z.

AU - Zieliński, M.

AU - Zieliński, P.

AU - Britavskiy, N.

AU - Gomboc, A.

AU - Sokolovsky, K.

AU - Hodgkin, S. T.

AU - Abe, L.

AU - Aldi, G. F.

AU - Almannaei, A.

AU - Altavilla, G.

AU - Al Qasim, A.

AU - Anupama, G. C.

AU - Awiphan, S.

AU - Bachelet, E.

AU - Bakış, V.

AU - Baker, S.

AU - Bartlett, S.

AU - Bendjoya, P.

AU - Benson, K.

AU - Bikmaev, I. F.

AU - Birenbaum, G.

AU - Blagorodnova, N.

AU - Blanco-Cuaresma, S.

AU - Boeva, S.

AU - Bonanos, A. Z.

AU - Bozza, V.

AU - Bramich, D. M.

AU - Bruni, I.

AU - Burenin, R. A.

AU - Burgaz, U.

AU - Butterley, T.

AU - Caines, H. E.

AU - Caton, D. B.

AU - Calchi Novati, S.

AU - Carrasco, J. M.

AU - Cassan, A.

AU - Čepas, V.

AU - Cropper, M.

AU - Chruślińska, M.

AU - Clementini, G.

AU - Clerici, A.

AU - Conti, D.

AU - Conti, M.

AU - Cross, S.

AU - Cusano, F.

AU - Damljanovic, G.

AU - Dapergolas, A.

AU - D’ago, G.

AU - De Bruijne, J. H. J.

AU - Dennefeld, M.

AU - Dhillon, V. S.

AU - Dominik, M.

AU - Dziedzic, J.

AU - Erece, O.

AU - Eselevich, M. V.

AU - Esenoglu, H.

AU - Eyer, L.

AU - Figuera Jaimes, R.

AU - Fossey, S. J.

AU - Galeev, A. I.

AU - Grebenev, S. A.

AU - Gupta, A. C.

AU - Gutaev, A. G.

AU - Hallakoun, N.

AU - Hamanowicz, A.

AU - Han, C.

AU - Handzlik, B.

AU - Haislip, J. B.

AU - Hanlon, L.

AU - Hardy, L. K.

AU - Harrison, D. L.

AU - Van Heerden, H. J.

AU - Hoette, V. L.

AU - Horne, K.

AU - Hudec, R.

AU - Hundertmark, M.

AU - Ihanec, N.

AU - Irtuganov, E. N.

AU - Itoh, R.

AU - Iwanek, P.

AU - Jovanovic, M. D.

AU - Janulis, R.

AU - Jelínek, M.

AU - Jensen, E.

AU - Kaczmarek, Z.

AU - Katz, D.

AU - Khamitov, I. M.

AU - Kilic, Y.

AU - Klencki, J.

AU - Kolb, U.

AU - Kopacki, G.

AU - Kouprianov, V. V.

AU - Kruszyńska, K.

AU - Kurowski, S.

AU - Latev, G.

AU - Lee, C.-H.

AU - Leonini, S.

AU - Leto, G.

AU - Lewis, F.

AU - Li, Z.

AU - Liakos, A.

AU - Littlefair, S. P.

AU - Lu, J.

AU - Manser, C. J.

AU - Mao, S.

AU - Maoz, D.

AU - Martin-Carrillo, A.

AU - Marais, J. P.

AU - Maskoliūnas, M.

AU - Maund, J. R.

AU - Meintjes, P. J.

AU - Melnikov, S. S.

AU - Ment, K.

AU - Mikołajczyk, P.

AU - Morrell, M.

AU - Mowlavi, N.

AU - Moździerski, D.

AU - Murphy, D.

AU - Nazarov, S.

AU - Netzel, H.

AU - Nesci, R.

AU - Ngeow, C.-C.

AU - Norton, A. J.

AU - Ofek, E. O.

AU - Pakštienė, E.

AU - Palaversa, L.

AU - Pandey, A.

AU - Paraskeva, E.

AU - Pawlak, M.

AU - Penny, M. T.

AU - Penprase, B. E.

AU - Piascik, A.

AU - Prieto, J. L.

AU - Qvam, J. K. T.

AU - Ranc, C.

AU - Rebassa-Mansergas, A.

AU - Reichart, D. E.

AU - Reig, P.

AU - Rhodes, L.

AU - Rivet, J.-P.

AU - Rixon, G.

AU - Roberts, D.

AU - Rosi, P.

AU - Russell, D. M.

AU - Zanmar Sanchez, R.

AU - Scarpetta, G.

AU - Seabroke, G.

AU - Shappee, B. J.

AU - Schmidt, R.

AU - Shvartzvald, Y.

AU - Sitek, M.

AU - Skowron, J.

AU - Śniegowska, M.

AU - Snodgrass, C.

AU - Soares, P. S.

AU - Van Soelen, B.

AU - Spetsieri, Z. T.

AU - Stankevičiūtė, A.

AU - Steele, I. A.

AU - Street, R. A.

AU - Strobl, J.

AU - Strubble, E.

AU - Szegedi, H.

AU - Tinjaca Ramirez, L. M.

AU - Tomasella, L.

AU - Tsapras, Y.

AU - Vernet, D.

AU - Villanueva, S.

AU - Vince, O.

AU - Wambsganss, J.

AU - Van Der Westhuizen, I. P.

AU - Wiersema, K.

AU - Wium, D.

AU - Wilson, R. W.

AU - Yoldas, A.

AU - Zhuchkov, R. Ya.

AU - Zhukov, D. G.

AU - Zdanavičius, J.

AU - Zoła, S.

AU - Zubareva, A.

N1 - Funding: UK STFC consolidated grant ST/M001296/1 (KH); European Commission H2020 OPTICON grant 730890 (OPTICON) (MD).

PY - 2020/1

Y1 - 2020/1

N2 - 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.

AB - 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.

KW - Stars: individual: Gaia16aye

KW - Gravitational lensing: micro

KW - Techniques: photometric

KW - Binaries: general

U2 - 10.1051/0004-6361/201935097

DO - 10.1051/0004-6361/201935097

M3 - Article

SN - 0004-6361

VL - 633

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A98

ER -

Full orbital solution for the binary system in the Northern Galactic Disk microlensing event Gaia16aye

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OPTICON - H2020: H2020 OPTICON

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

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