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• W3100305954 abstract "Planet detection through microlensing is usually limited by a well-known degeneracy in the Einstein timescale $t_E$, which prevents mass and distance of the lens to be univocally determined. It has been shown that a satellite in geosynchronous orbit could provide masses and distances for most standard planetary events ($t_E approx 20$ days) via a microlens parallax measurement. This paper extends the analysis to shorter Einstein timescales, $t_E approx 1$ day, when dealing with the case of Jupiter-mass lenses. We then study the capabilities of a low Earth orbit satellite on even shorter timescales, $t_E approx 0.1$ days. A Fisher matrix analysis is employed to predict how the 1-$sigma$ error on parallax depends on $t_E$ and the peak magnification of the microlensing event. It is shown that a geosynchronous satellite could detect parallaxes for Jupiter-mass free floaters and discover planetary systems around very low-mass brown dwarfs. Moreover, a low Earth orbit satellite could lead to the discovery of Earth-mass free-floating planets. Limitations to these results can be the strong requirements on the photometry, the effects of blending, and in the case of the low orbit, the Earth's umbra." @default.
• W3100305954 created "2020-11-23" @default.
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• W3100305954 date "2015-12-17" @default.
• W3100305954 modified "2023-10-16" @default.
• W3100305954 title "Microlensing planet detection via geosynchronous and low Earth orbit satellites" @default.
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• W3100305954 doi "https://doi.org/10.1051/0004-6361/201527380" @default.
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