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2012MNRAS.422.2477H - Mon. Not. R. Astron. Soc., 422, 2477-2488 (2012/May-3)
Temperature-pressure profile of the hot Jupiter HD 189733b from HST sodium observations: detection of upper atmospheric heating.
HUITSON C.M., SING D.K., VIDAL-MADJAR A., BALLESTER G.E., LECAVELIER DES ETANGS A., DESERT J.-M. and PONT F.
Abstract (from CDS):
We compare the spectral absorption profile over 5.5 scale heights with model spectral absorption profiles and constrain the temperature at different atmospheric regions, allowing us to construct a vertical temperature profile. We identify two temperature regimes: a 1280±240 K region derived from the Na I doublet line wings corresponding to altitudes below ∼500 km, and a 2800±400 K region derived from the Na I doublet line cores corresponding to altitudes from ∼500 to 4000 km. The zero altitude is defined by the white-light radius of RP/R*= 0.15628±0.00009. The temperature rises with altitude, which is likely evidence of a thermosphere.
The absolute pressure scale depends on the species responsible for the Rayleigh signature and its abundance. We discuss a plausible scenario for this species, a high-altitude silicate haze and the atmospheric temperature-pressure profile that results. In this case, the high-altitude temperature rise for HD 189733b occurs at pressures of 10–5 to 10–8 bar.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): techniques: spectroscopic - planets and satellites: individual: HD 189733b - stars: individual: HD 189733
Simbad objects: 5
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