Combining our astrometric measurements with the ones previously published in the literature, we constrain the orbital parameters of the four planets using PyAstrOFit, our new open-source python package dedicated to orbital fitting using Bayesian inference with Monte-Carlo Markov Chain sampling. This includes the identification and careful evaluation of the different contributions to the error budget, including systematic errors. We performed thorough post-processing of the IRDIS images with the Vortex Imaging Processing (VIP) package to derive a robust astrometric measurement for the four planets. We also aim to present a detailed analysis of the orbital parameters for the four planets. We aim to take full advantage of the SPHERE capabilities to derive accurate astrometric measurements based on H-band images acquired with the Infra-Red Dual-band Imaging and Spectroscopy (IRDIS) subsystem, and to explore the ultimate astrometric performance of SPHERE in this observing mode. As such, it was observed on five consecutive nights during the SPHERE science verification in December 2014.Īims. HR8799 is orbited by at least four giant planets, making it a prime target for the recently commissioned Spectro-Polarimetric High-contrast Exoplanet REsearch (VLT/SPHERE). California Blvd, MC 249-17, Pasadena, CA 91125, USAĤ Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAĥ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAĬontext. Pueyo 5ġ Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, 19c Allée du Six Août, 4000 Liège, BelgiumĢ European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chileģ Department of Astronomy, California Institute of Technology, 1200 E.
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