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  OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source?

Dominik, M., Bachelet, E., Bozza, V., Street, R. A., Han, C., Hundertmark, M., et al. (2019). OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source? Monthly Notices of the Royal Astronomical Society, 484(4), 5608-5632. doi:10.1093/mnras/stz306.

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Dominik, M, Author
Bachelet, E, Author
Bozza, V, Author
Street, R A, Author
Han, C, Author
Hundertmark, M, Author
Udalski, A, Author
Bramich, D M, Author
Alsubai, K A, Author
Novati, S Calchi, Author
Ciceri, S, Author
D’Ago, G, Author
Jaimes, R Figuera, Author
Haugbølle, T, Author
Hinse, T C, Author
Horne, K, Author
Jørgensen, U G, Author
Juncher, D, Author
Kains, N, Author
Korhonen, H, Author
Mancini, L, AuthorMenzies, J, AuthorPopovas, A, AuthorRabus, M, AuthorRahvar, S, AuthorScarpetta, G, AuthorSchmidt, R, AuthorSkottfelt, J, AuthorSnodgrass, Colin1, Author              Southworth, J, AuthorStarkey, D, AuthorSteele, I A, AuthorSurdej, J, AuthorTsapras, Y, AuthorWambsganss, J, AuthorWertz, O, AuthorPietrukowicz, P, AuthorSzymański, M K, AuthorMróz, P, AuthorSkowron, J, AuthorSoszyński, I, AuthorUlaczyk, K, AuthorPoleski, R, AuthorWyrzykowski, Ł, AuthorKozłowski, S, Author more..
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              


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 Abstract: Discussing the particularly long gravitational microlensing event OGLE-2014-BLG-1186 with a time-scale tE ∼ 300 d, we present a methodology for identifying the nature of localised deviations from single-lens point-source light curves, which ensures that (1) the claimed signal is substantially above the noise floor, (2) the inferred properties are robustly determined and their estimation is not subject to confusion with systematic noise in the photometry, (3) alternative viable solutions within the model framework are not missed. Annual parallax and binarity could be separated and robustly measured from the wing and the peak data, respectively. We find matching model light curves that involve either a binary lens or a binary source, and discover hitherto unknown model ambiguities. Our binary-lens models indicate a planet of mass M2 = (45 ± 9) M⊕, orbiting a star of mass M1 = (0.35 ± 0.06) M⊙, located at a distance DL = (1.7 ± 0.3) kpc from Earth, whereas our binary-source models suggest a brown-dwarf lens of M = (0.046 ± 0.007) M⊙, located at a distance DL = (5.7 ± 0.9) kpc, with the source potentially being a (partially) eclipsing binary involving stars predicted to be of similar colour given the ratios between the luminosities and radii. Further observations might resolve the ambiguity in the interpretation in favour of either a lens or a source binary. We experienced that close binary source stars pose a challenge for claiming the detection of planets by microlensing in events where the source passes very close to the lens star hosting the planet.


Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz306
 Degree: -



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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 484 (4) Sequence Number: - Start / End Page: 5608 - 5632 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150