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Reconciling the predictions of microlensing analysis with radial velocity measurements for OGLE-2011-BLG-0417


Bachelet, E and Beaulieu, JP and Boisse, I and Santerne, A and Street, RA, Reconciling the predictions of microlensing analysis with radial velocity measurements for OGLE-2011-BLG-0417, Astrophysical Journal, 865, (2) pp. 1-11. ISSN 0004-637X (2018) [Refereed Article]

DOI: doi:10.3847/1538-4357/aad63b


Microlensing is able to reveal multiple body systems located several kilo-parsec away from the Earth. Since it does not require the measurement of light from the lens, microlensing is sensitive to a range of objects, from free-floating planets to stellar black holes. But, if the lens emits enough light, the microlensing model predictions can be tested with high-resolution imaging and/or radial velocity methods. Such a follow-up was done for the microlensing event OGLE-2011-BLG-0417, which was expected to be a close by (<= 1 kpc), low-mass (similar to 0.8Me) binary star with a period of P similar to 1.4 year. The spectroscopic follow-up observations conducted with the Very Large Telescope did not measure any variation in the radial velocity, which is in strong contradiction with the published microlensing model. In the present work, we remodel this event and find a simpler model that is in agreement with all the available measurements, including the recent Gaia Data Release 2 parallax constraints. We also present a new way to distinguish degenerate models using the Gaia Data Release 2 proper motions. This work stresses the importance of thorough microlensing modeling, especially with the horizon of the Wide Field Infrared Survey Telescope and the Euclid microlensing space missions.

Item Details

Item Type:Refereed Article
Keywords:binaries, general -gravitational lensing, micro - techniques, radial velocities
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Beaulieu, JP (Dr Jean-Philippe Beaulieu)
ID Code:152787
Year Published:2018
Web of Science® Times Cited:4
Deposited By:Physics
Deposited On:2022-08-24
Last Modified:2022-08-24

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