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Spatially resolved spectroscopy of the exoplanet HR 8799 c

HR 8799 is a multi-planet system detected in direct imaging, with three companions known so far. Here, we present spatially resolved VLT/NACO 3.88--4.10 micron spectroscopy of the middle planet, HR 8799 c, which has an estimated mass of ~10 Mjup, temperature of ~1100 K and projected separation of 38 AU. The spectrum shows some differences in the continuum from existing theoretical models, particularly longwards of 4 microns, implying that detailed cloud structure or non-equilibrium conditions may play an important role in the physics of young exoplanetary atmospheres.

preprint2010arXivOpen access
M. JansonC. BergforsM. GotoW. BrandnerD. Lafreniere
astro-ph.EP
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M. JansonC. BergforsM. GotoW. BrandnerD. Lafreniere

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