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Paper: Ground-based Astrometric Planet Searches using Medium-sized Telescopes
Volume: 430, Pathways Towards Habitable Planets
Page: 401
Authors: Anglada-Escudé, G.; Boss, A. P.; Weinberger, A. J.
Abstract: Ground based astrometry has not been very successful in detecting extrasolar planets. Some reasons are the relatively long time baselines required and instrumental stability requirements. Also, the number of free parameters is large compared to other methods (such as Doppler spectroscopy) and additional information is often required to constrain the true nature of the candidate signals. An example is the recently announced astrometric detection of a planet around the low mass star VB 10, where a careful reanalysis of the astrometric data casts some doubts on the true nature of the announced low mass companion. The Carnegie Astrometric Planet Search Program (CAPS), is focused on the detection of gas giant exoplanets around nearby low mass stars. We show that accuracies at the level of 0.4 mas can be reached on time-scales of years with a 2.5 class meter telescope given a sufficiently stable and optimized camera (CAPScam-S). This accuracy enables the detection of Jupiter-sized planets around nearby cool stars providing at the same time, accurate measurements of their distances and spatial motion.
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