Exploring the architectures of nearby exoplanetary systems using high-precision space astrometry
Résumé
To increase the accuracy of measurements obtained by global astrometry on specific astronomical objects, it is necessary to devote more observation time to determining their relative position with respect to the stars in the field of view. In ESA latest prospective study, the Senior Committee recognized that, after Gaia, "the next steps in space astrometry could be to improve by one order of magnitude relative astrometric accuracy ". The Theia mission was submitted in 2022 to ESA, using a diffraction-limited telescope about 1m in diameter and with a field of view of 0.5 degrees, capable of achieving sub-microsecond angular accuracy. Such precision makes it possible to study the architecture of exoplanetary systems close to the Sun, down to the mass of the Earth. We will present this space mission project, its detection capabilities and how this M-class project could be beneficial for understanding the architectures of nearby exoplanetary systems.
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