Spatially resolved spectroscopy of the exoplanet HR 8799 c

Details Spatially resolved spectroscopy of the exoplanet HR 8799 c Spatially resolved spectroscopy of the exoplanet HR 8799 c

2010-01-12

arxiv.org/abs/1001.2017v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, 4 figures, accepted for publication in ApJ Letters

Scientific paper

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.

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