The Atmosphere of HAT-P-11 b

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The Atmosphere of HAT-P-11 b

Post by Sirius_Alpha on 24th September 2014, 2:26 pm

http://www.spacetelescope.org/news/heic1420/

Astronomers using data from the NASA/ESA Hubble Space Telescope, the Spitzer Space Telescope, and the Kepler Space Telescope have discovered clear skies and steamy water vapour on a planet outside our Solar System. The planet, known as HAT-P-11b, is about the size of Neptune, making it the smallest exoplanet ever on which water vapour has been detected. The results will appear in the online version of the journal Nature on 24 September 2014.

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Re: The Atmosphere of HAT-P-11 b

Post by Sirius_Alpha on 30th September 2014, 9:10 pm

Now on arXiv.

Water Vapour Absorption in the Clear Atmosphere of an exo-Neptune
http://arxiv.org/abs/1409.8349

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Re: The Atmosphere of HAT-P-11 b

Post by Sirius_Alpha on 1st November 2016, 8:21 pm

Discovery of the secondary eclipse of HAT-P-11 b
https://arxiv.org/abs/1611.00153

We report the detection of the secondary eclipse of HAT-P-11 b, a Neptune-sized planet orbiting an active K4 dwarf. Using all available short-cadence data of the Kepler mission, we derive refined planetary ephemeris increasing their precision by more than an order of magnitude. Our simultaneous primary and secondary transit modeling results in improved transit and orbital parameters. In particular, the precise timing of the secondary eclipse allows to pin down the orbital eccentricity to 0.26459+0.00069−0.00048. The secondary eclipse depth of 6.09+1.12−1.11 ppm corresponds to a 5.5σ detection and results in a geometric albedo of 0.390.07 for HAT-P-11 b, close to Neptune's value, which may indicate further resemblances between these two bodies. Due to the substantial orbital eccentricity, the planetary equilibrium temperature is expected to change significantly with orbital position and ought to vary between 630∘ K and 950∘ K, depending on the details of heat redistribution in the atmosphere of HAT-P-11 b.

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Re: The Atmosphere of HAT-P-11 b

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