New 24 µm light curve for υ And b

A New 24 micron Phase Curve for upsilon Andromedae b
http://arxiv.org/abs/1008.0393

Abstract wrote:

We report the detection of 24 micron variations from the planet-hosting upsilon Andromedae system consistent with the orbital periodicity of the system's innermost planet, upsilon And b. We find a peak-to-valley phase curve amplitude of 0.00130 times the mean system flux. Using a simple model with two hemispheres of constant surface brightness and assuming a planetary radius of 1.3 Jupiter radii gives a planetary temperature contrast of >900 K and an orbital inclination of >28 degrees. We further report the largest phase offset yet observed for an extrasolar planet: the flux maximum occurs ~80 degrees before phase 0.5. Such a large phase offset is difficult to reconcile with most current atmospheric circulation models. We improve on earlier observations of this system in several important ways: (1) observations of a flux calibrator star demonstrate the MIPS detector is stable to 10^-4 on long timescales, (2) we note that the background light varies systematically due to spacecraft operations, precluding use of this background as a flux calibrator (stellar flux measured above the background is not similarly affected), and (3) we calibrate for flux variability correlated with motion of the star on the MIPS detector. A reanalysis of our earlier observations of this system is consistent with our new result.

It is possible to unite with this topic?
https://solar-flux.forumotion.com/extrasolar-planetology-f5/a-new-24-micron-phase-curve-for-upsilon-and-b-t686.htm

Yes, thanks for pointing that out. I thought there was already a thread but didn't see it.

Yet another surprise from hot Jupiter atmospheres. Hotspot seems to be 80 degrees away from the substellar point.

Hot Jupiters are weird.

The preprint for this can be found here.

Oh well, might as well merge the threads

Done.

http://arxiv.org/abs/1008.0393


Probably it says is the constant weather phenomenon, and that the planets really tidally captured (otherwise, the phase curves would have been different).