Universal Nightside Temperature on Hot Jupiters due to Nocturnal Clouds

Go down

Universal Nightside Temperature on Hot Jupiters due to Nocturnal Clouds

Post by Sirius_Alpha on 4th September 2018, 10:11 pm

A Universal Nightside Temperature on Hot Jupiters due to Nocturnal Clouds
https://arxiv.org/abs/1809.00002

The nightsides of synchronously rotating planets are sensitive probes of atmospheric heat transport; detecting thermal flux from the nightside of such a planet means that energy has been transported there from its dayside. We invert orbital phase curves into longitudinally resolved brightness distributions in order to estimate the nightside effective temperatures for twelve hot Jupiters with full-orbit infrared phase curves. We find that, although dayside temperatures on hot Jupiters are proportional to their irradiation temperatures, nightside temperatures of typical hot Jupiters are approximately 1000K. The three exceptions, WASP-12b, WASP-33b, and WASP-103b, are ultra-hot Jupiters: planets with dayside temperatures hot enough to dissociate molecular hydrogen. Models predict much more varied nightside temperatures than we observe. Energy balance models provide a better fit to the observations if wave propagation is negligible for heat transport. Alternatively, the relatively uniform nightside temperatures of hot Jupiters could be due to thick clouds. Mineral or sulfide clouds, if they had sufficiently large particles, could explain the uniform nightside temperature, as well as the relatively featureless nightside spectra of these planets.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3702
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum