Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..857k&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Astronomy and Astrophysics
Astrophysics
Scientific paper
Abstract HD17156b is a newly found transiting extrasolar giant planet that orbits its host star in a highly eccentric orbit with an orbital semi-major axis of ~0.16 AU [1],[2],[3]. Its period, 21.2 days, is the longest among the known transiting planets. We have modified a three-dimensional model of the upper atmosphere and ionosphere for extrasolar giant planets [4],[5] to simulate the progress of HD17156b along its eccentric orbit. The simulations allow us to discuss the stability, circulation, and composition of the upper atmosphere of HD17156b. We find that the atmosphere is unlikely to escape hydrodynamically at any point along the orbit, even if the thermosphere is almost entirely composed of atomic hydrogen and H+, and if cooling by H3 + ions is negligible. The nature of the upper atmosphere is sensitive to the composition of the thermosphere, and the mixing ratio of H2 in particular. Based on our results, we point to potential observations that could be used to discriminate between different models. We also note that our new model can be adapted to any system similar to HD17156b, as it allows for the modelling of the stellar irradiation on the atmosphere along eccentric orbits. References [1] Fischer, D. et al. (2007) ApJ, 669, 1336-1344. [2] Barbieri, A. et al. (2007) Astron.Astrophys., 476, L13-L16. [3] Gillon, M., Triaud, A. H. M J., Mayor, M., Queloz, D., Udry, S. and North, P. (2007) preprint, arXiv:07012.2073 [4] Koskinen, T. T., Aylward, A. D., Smith, C. G. A. and Milller, S. (2007) ApJ, 661, 515-256 [5] Koskinen, T. T., Aylward, A. D. and Miller, S. (2007) Nature, 450, 845-848
Aylward Alan D.
Koskinen Tommi T.
Miller Samantha
No associations
LandOfFree
3D Simulations of the Upper Atmosphere and Ionosphere of HD17156b does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with 3D Simulations of the Upper Atmosphere and Ionosphere of HD17156b, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 3D Simulations of the Upper Atmosphere and Ionosphere of HD17156b will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1795199