VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets

Details VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets

2011-02-25

arxiv.org/abs/1102.5330v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

5 pages, 4 figures, 1 table, accepted for publication in A\&A. Updated version includes minor changes made in the proofs

Scientific paper

HR8799 is so far the only directly imaged multiple exoplanet system. The orbital configuration would, if better known, provide valuable insight into the formation and dynamical evolution of wide-orbit planetary systems. We present L'-band observations of the HR8799 system obtained with NACO at VLT, adding to the astrometric monitoring of the planets HR8799b, c and d. We investigate how well the two simple cases of (i) a circular orbit and (ii) a face-on orbit fit the astrometric data for HR8799d over a total time baseline of ~2 years. The results indicate that the orbit of HR8799d is inclined with respect to our line of sight, and suggest that the orbit is slightly eccentric or non-coplanar with the outer planets and debris disk.

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