OGLE-2017-BLG-0039: Microlensing Event with Light from a Lens Identified from Mass Measurement

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10391212" target="_blank" >RIV/00216208:11320/18:10391212 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/1538-4357/aae536" target="_blank" >https://doi.org/10.3847/1538-4357/aae536</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/aae536" target="_blank" >10.3847/1538-4357/aae536</a>

Result language
angličtina
Original language name
OGLE-2017-BLG-0039: Microlensing Event with Light from a Lens Identified from Mass Measurement
Original language description
We present an analysis of the caustic-crossing binary microlensing event OGLE-2017-BLG-0039. Thanks to the very long duration of the event, with a time scale t(E) similar to 130 days, the microlens parallax is measured precisely despite its low value of pi(E) similar to 0.06. Analysis of the well-resolved caustic crossings during the source star's entrance and exit of the caustic yields an angular Einstein radius of theta(E) similar to 0.6 mas. The measured pi(E) and theta(E) indicate that the lens is a binary composed of two stars with masses similar to 1.0 M-circle dot and similar to 0.15 M-circle dot, and is located at a distance of similar to 6 kpc. From the color and brightness of the lens estimated from its determined mass and distance, it is expected that similar to 2/3 of the I-band blended flux comes from the lens. Therefore, the event is a rare case of a bright lens event for which high-resolution follow-up observations can confirm its nature.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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