Astrometric microlensing: a channel to detect multiple lens systems
نویسندگان
چکیده
منابع مشابه
Astrometric Microlensing of Stars
Due to dramatic improvements in the precision of astrometric measurements, the observation of light centroid shifts in observed stars due to intervening massive compact objects (‘astrometric microlensing’) will become possible in the near future. Upcoming space missions, such as SIM and GAIA, will provide measurements with an accuracy of 4–60 μas depending on the magnitude of the observed stars...
متن کاملRelativistic corrections to astrometric shifts due to gravitational microlensing
Gravitational microlensing has proved to be a versatile astrophysical tool. Recently, the question of whether higher order relativistic corrections can influence the observable properties of microlensing has been addressed. This letter extends earlier studies, investigating higher order relativistic terms in astrometric shifts during microlensing events, revealing that they produce no effects. ...
متن کاملExtended Source Effects in Astrometric Gravitational Microlensing
Extended source size effects have been detected in photometric monitoring of gravitational microlensing events. We study similar effects in the centroid motion of an extended source lensed by a point mass. We show that the centroid motion of a source with uniform surface brightness can be obtained analytically. For a source with circularly symmetric limb-darkening profile, the centroid motion c...
متن کاملAstrometric Microlensing with the GAIA satellite
GAIA is the “super-Hipparcos” survey satellite selected as a Cornerstone 6 mission by the European Space Agency. GAIA can measure microlensing by the brightening of source stars. For the broad G band photometer, the all-sky source-averaged photometric optical depth is ∼ 10−7. There are ∼ 1300 photometric microlensing events for which GAIA will measure at least one datapoint on the amplified lig...
متن کاملEffect of a wide binary companion to the lens on the astrometric behavior of gravitational microlensing events
In this paper, we investigate the effect of a wide binary companion of the lens on the astrometric behavior of Galactic gravitational microlensing events and compare it to the effect on the photometric behavior. We find that the wide binary companion of the lens can affect the centroid motion of images substantially even if the corresponding light curve appears to be the one of a standard singl...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2002
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2002.05608.x