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• W2255254562 abstract "We study the benefits of polarimetry observations of microlensing events to detect and characterize circumstellar disks around the microlensed stars located at the Galactic bulge. These disks which are unresolvable from their host stars make a net polarization effect due to their projected elliptical shapes. Gravitational microlensing can magnify these signals and make them be resolved. The main aim of this work is to determine what extra information about these disks can be extracted from polarimetry observations of microlensing events in addition to those given by photometry ones. Hot disks which are closer to their host stars are more likely to be detected by microlensing, owing to more contributions in the total flux. By considering this kind of disks, we show that although the polarimetric efficiency for detecting disks is similar to the photometric observation, but polarimetry observations can help to constraint the disk geometrical parameters e.g. the disk inner radius and the lens trajectory with respect to the disk semimajor axis. On the other hand, the time scale of polarimetric curves of these microlensing events generally increases while their photometric time scale does not change. By performing a Monte Carlo simulation, we show that almost 4 optically-thin disks around the Galactic bulge sources are detected (or even characterized) through photometry (or polarimetry) observations of high-magnification microlensing events during 10 years monitoring of 150 million objects." @default.
• W2255254562 created "2016-06-24" @default.
• W2255254562 creator A5035164270 @default.
• W2255254562 creator A5091451866 @default.
• W2255254562 date "2015-10-28" @default.
• W2255254562 modified "2023-10-03" @default.
• W2255254562 title "Polarimetric microlensing of circumstellar discs" @default.
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• W2255254562 doi "https://doi.org/10.1093/mnras/stv2297" @default.
• W2255254562 hasPublicationYear "2015" @default.
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