| Issue |
A&A
Volume 528, April 2011
|
|
|---|---|---|
| Article Number | A134 | |
| Number of page(s) | 4 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201116493 | |
| Published online | 15 March 2011 | |
VLT/NACO astrometry of the HR 8799 planetary system⋆
L′-band observations of the three outer planets
1 Max-Planck-Institut für
Astronomie, Königstuhl
17, 69117
Heidelberg,
Germany
e-mail: bergfors@mpia.de
2 University of Toronto, Dept. of
Astronomy, 50 St George
Street, Toronto,
ON, M5S 3H8, Canada
3 Landessternwarte, Zentrum für
Astronomie der Universität Heidelberg, Königstuhl, 69117
Heidelberg,
Germany
Received:
10
January
2011
Accepted:
16
February
2011
Context. HR 8799 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.
Aims. We present data which add to the astrometric monitoring of the planets HR 8799 b, 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 HR 8799 d over a total time baseline of ~2 years.
Methods. The HR 8799 planetary system was observed in L′-band with NACO at VLT.
Results. The results indicate that the orbit of HR 8799 d 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.
Key words: planetary systems / stars: individual: HR 8799
© ESO, 2011
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