Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-12
Mon.Not.Roy.Astron.Soc.364:649-653,2005
Astronomy and Astrophysics
Astrophysics
6 pages. MNRAS, in press. New version fixes some incorrect numbers in Table 1. References updated
Scientific paper
10.1111/j.1365-2966.2005.09587.x
Through a simple physical argument we show that the slant optical depth through the atmosphere of a "hot Jupiter" planet is 35-90 times greater than the normal optical depth. This not unexpected result has direct consequences for the method of transmission spectroscopy for characterizing the atmospheres of transiting giant planets. The atmospheres of these planets likely contain minor condensates and hazes which at normal viewing geometry have negligible optical depth, but at slant viewing geometry have appreciable optical depth that can obscure absorption features of gaseous atmospheric species. We identify several possible condensates. We predict that this is a general masking mechanism for all planets, not just for HD 209458b, and will lead to weaker than expected or undetected absorption features. Constraints on an atmosphere from transmission spectroscopy are not the same as constraints on an atmosphere at normal viewing geometry.
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