J/A+A/633/A98 Gaia16aye microlensing event photometry (Wyrzykowski+, 2020)
Full orbital solution for the binary system in the northern Galactic disk
microlensing event Gaia16aye.
Wyrzykowski L., Mroz P., Rybicki K. A., Gromadzki M., Kolaczkowski Z.,
Zielinski M., Zielinski 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., Bakis V. Baker S., Bartlett S.,
Bendjoya P., Benson K., Bikmaev I. F., Birenbaum G., Blagorodnova N.,
Blanco-Cuaresma S., Boeva S., Bonanos A. Z., Bozza V., Bramich D.M.,
Bruni I., Burenin R.A., Burgaz U., Butterley T., Caines H.E., Caton D.B.,
Calchi Novati S., Carrasco J.M., Cassan A., Cepas V., Cropper M.,
Chruslinska M., Clementini G., Clerici A., Conti D., Conti M., Cross S.,
Cusano F., Damljanovic G., Dapergolas A., D'Ago G., de Bruijne J.H.J.,
Dennefeld M., Dhillon V.S., Dominik M., Dziedzic J., Erece O.,
Eselevich M.V., Esenoglu H., Eyer L., Figuera Jaimes R., Fossey S.J.,
Galeev A. I., Grebenev S. A., Gupta A.C., Gutaev A. G., Hallakoun N.,
Hamanowicz A., Han C., Handzlik B., Haislip J.B., Hardy L.K., Harrison D.L.,
Hoette V.L., Horne K., Hudec R., Hundertmark M., Ihanec N., Irtuganov E.N.,
Itoh R., Iwanek P., Jovanovic M.D., Janulis R., Jelinek M., Jensen E.,
Kaczmarek Z., Katz D., Khamitov I.M., Kilic Y., Klencki J., Kolb U.,
Kouprianov V.V., Kruszynska K., Kurowski S., Latev G., Lee C-H., Leonini S.,
Leto G., Lewis F., Li Z., Liakos A., Littlefair S.P., Lu J., Manser C.J.,
Mao S., Maoz D., Maskoliunas M., Maund J.R., Melnikov S. S., Ment K.,
Mikolajczyk P., Morrell M., Mowlavi N., Mozdzierski D., Nazarov S.,
Netzel H., Nesci R., Ngeow C. -C., Norton A.J., Ofek E. O., Pakstiene E.,
Palaversa L., Pandey A., Paraskeva E., Pawlak M., Penny M.T.,
Penprase B.E., Piascik A., Prieto J.L., Qvam J.K.T., Ranc C.,
Rebassa-Mansergas A., Reichart D.E., Reig P., Rhodes L., Rivet J.-P.,
Rixon G., Roberts D., Rosi P., Russell D.M., Zanmar Sanchez R.,
Scarpetta G., Seabroke G., Shappee B.J., Schmidt R., Shvartzvald Y.,
Sitek M., Skowron J., Sniegowska M., Snodgrass C., Soares P.S.,
Spetsieri Z.T., Stankeviciute A., Steele I.A., Street R.A., Strobl J.,
Tinjaca Ramirez L.M., Tomasella L., Tsapras Y., Villanueva S.Jr., Vince O.,
Wambsganss J., Wiersema K., Wilson R.W., Yoldas A., Zhuchkov R.Ya.,
Zhukov D.G., Zdanavicius J., Zola S., Zubareva A.
<Astron. Astrophys. 633, A98 (2020)>
=2020A&A...633A..98W 2020A&A...633A..98W (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Photometry
Keywords: gravitational lensing: micro - techniques: photometric -
binaries: general stars: individual: Gaia16aye
Abstract:
Gaia16aye was a binary microlensing event, the first such event ever
discovered in the direction towards the Northern Galactic Disk and one
of the first microlensing events detected and alerted by the Gaia
space mission. Its light curve exhibited five distinct brightening
episodes, reaching up to 11mag, and was covered in great detail with
almost 25000 data points gathered by a network of telescopes.
We present the photometric and spectroscopic follow-up covering 500
days of the event evolution and search for a possible microlensing
model in order to derive the parameters of the lensing binary system.
For Gaia16aye event we employed a full Keplerian binary orbit
microlensing model combined with the Earth and Gaia motion around the
Sun, to reproduce the complex light curve.
The photometric data allowed us to solve the microlensing events
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 binary system properties were
derived from microlensing parameters and we found that the system is
composed of two main-sequence stars with masses 0.570.05 M and
0.36±0.03M☉ at 780pc, with an orbital period of 2.88 years and
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.
Events like Gaia16aye indicate the potential for the microlensing
method to probe the mass function of dark objects, including black
holes, in other directions than the Galactic bulge. This case also
emphasises the importance of long-term time-domain coordinated
observations which can be done with a network of heterogeneous
telescopes.
Description:
Photometric data for the microlensing event Gaia16aye. We present
three separate tables with the follow-up data, Gaia data and the set
of data used in the modelling process.
Objects:
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RA (ICRS) DE Designation(s)
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19 40 01.13 +30 07 53.4 Gaia DR2 2032454944878107008 = Gaia 16aye
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
model.dat 30 590 Photometry of data used in modelling
followup.dat 58 24513 Photometry of all follow-up data
gaia.dat 37 84 Photometric measurements from Gaia
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: model.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
15- 20 F6.3 mag mag Apparent magnitude in filter
22- 26 F5.3 mag e_mag Uncertainty in mag
28 A1 --- Filter [GVIi] Filter
30 I1 --- Obs [1/8] Observatory code (1)
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Note (1): Observatory codes as follows:
1 = Gaia (G)
2 = Bialkow (I)
3 = APT2 (I)
4 = LT (i)
5 = DEMONEXT (I)
6 = Swarthmore (I)
7 = UBT60 (I)
8 = ASAS-SN (V)
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Byte-by-byte Description of file: followup.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Unique ID of the data point
8- 18 F11.5 d MJD Modified Julian Date
20- 25 F6.3 mag mag Apparent magnitude in Filter
27- 31 F5.3 mag e_mag Uncertainty in mag
33 A1 --- Filter [BGVgriz] Name of the photometric band
35- 58 A24 --- Tel ID of the telescope in the format
TelescopeCode_Observer or ObservatoryLabel
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Byte-by-byte Description of file: gaia.dat
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Bytes Format Units Label Explanations
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1- 19 A19 "datime" TCB TCB date in the format yyyy-mm-ddThh:mm:ss
21- 31 F11.3 d JD Julian Date
33- 37 F5.2 mag Gmag Apparent Gaia G magnitude
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Acknowledgements:
Lukasz Wyrzykowski, wyrzykow(at)astrouw.edu.pl,
Astronomical Observatory, University of Warsaw
(End) L. Wyrzykowski [Astron. Obs., Warsaw Univ.], P. Vannier [CDS] 21-Oct-2019