Physics and Astronomy
planets and satellites, numerical methods, atmospheric effects
We present results from an atmospheric circulation study of nine hot Jupiters that comprise a large transmission spectral survey using the Hubble and Spitzer Space Telescopes. These observations ex-hibit a range of spectral behavior over optical and infrared wavelengths which suggest diverse cloud and haze properties in their atmospheres. By utilizing the speciﬁc system parameters for each planet, we naturally probe a wide phase space in planet radius, gravity, orbital period, and equilibrium tem-perature. First, we show that our model “grid” recovers trends shown in traditional parametric studies of hot Jupiters, particularly equatorial superrotation and increased day-night temperature contrast with increasing equilibrium temperature. We show how spatial temperature variations, particularly between the dayside and nightside and west and east terminators, can vary by hundreds of K, which could imply large variations in Na, K, CO and CH4 abundances in those regions. These chemical vari-ations can be large enough to be observed in transmission with high-resolution spectrographs, such as ESPRESSO on VLT, METIS on the E-ELT, or with MIRI and NIRSpec aboard JWST. We also compare theoretical emission spectra generated from our models to available Spitzer eclipse depths for each planet, and ﬁnd that the outputs from our solar-metallicity, cloud-free models generally provide a good match to many of the datasets, even without additional model tuning. Although these models are cloud-free, we can use their results to understand the chemistry and dynamics that drive cloud formation in their atmospheres.
Source Publication Title
Kataria, T., Sing, D. K., Lewis, N. K., Visscher, C., Showman, A. P., Fortney, J. J., & Marley, M. S. (2016). Atmospheric Circulation of a Nine-Hot-Jupiter Sample: Probing Circulation and Chemistry over a Wide Phase Space. Astrophysical Journal, 821 (1) https://doi.org/10.3847/0004-637X/821/1/9