Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

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Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

Post by Sirius_Alpha on 25th April 2013, 11:35 pm

BEER analysis of Kepler and CoRoT light curves: I. Discovery of a hot Jupiter with superrotation evidence in Kepler data
http://arxiv.org/abs/1304.6841

We present the first case in which the BEER algorithm identified a hot Jupiter in the Kepler light curve, and its reality was confirmed by orbital solutions based on follow-up spectroscopy. The companion KIC 4570949b was identified by the BEER algorithm, which detected the BEaming (sometimes called Doppler boosting) effect together with the Ellipsoidal and Reflection/emission modulations (BEER), at an orbital period of 1.54 days, suggesting a planetary companion orbiting the 13.3 mag F star. Further investigation revealed that this star appeared in the Kepler eclipsing binary catalog with estimated primary and secondary eclipse depths of 5e-3 and 1e-4 respectively. Spectroscopic radial-velocity follow-up observations with TRES and SOPHIE confirmed KIC 4570949b as a transiting 2.0+/-0.26 Mjup hot Jupiter. The mass of a transiting planet can be estimated from either the beaming or the ellipsoidal amplitude. The ellipsoidal-based mass estimate of KIC 4570949b is consistent with the spectroscopically measured mass while the beaming-based estimate is significantly inflated. We explain this apparent discrepancy as evidence for the superrotation phenomenon, which involves eastward displacement of the hottest atmospheric spot of a tidally-locked planet by an equatorial super-rotating jet stream. This phenomenon was previously observed only for HD 189733b in the infrared. We show that a phase shift of 10.2+/-2.0 degrees of the planet reflection/emission modulation, due to superrotation, explains the apparently inflated beaming modulation, resolving the ellipsoidal/beaming amplitude discrepancy. KIC 4570949b is one of very few confirmed planets in the Kepler light curves that show BEER modulations and the first to show superrotation evidence in the Kepler band. Its discovery illustrates for the first time the ability of the BEER algorithm to detect short-period planets and brown dwarfs.


Last edited by Sirius_Alpha on 7th May 2013, 6:55 pm; edited 1 time in total

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Re: Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

Post by Lazarus on 7th May 2013, 6:38 pm

Kepler-76b
http://kepler.nasa.gov/Mission/discoveries/
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Re: Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

Post by Sirius_Alpha on 7th May 2013, 6:55 pm

Lazarus wrote:Kepler-76b
http://kepler.nasa.gov/Mission/discoveries/

Thread title changed.

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Re: Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

Post by Led_Zep on 14th May 2013, 6:08 am

http://www.space.com/21126-alien-planet-einstein-relativity.html
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Re: Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

Post by jyril on 14th May 2013, 5:40 pm

Um, they haven't heard of gravitational lensing planets?

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Re: Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

Post by Lazarus on 14th May 2013, 6:02 pm

jyril wrote:Um, they haven't heard of gravitational lensing planets?
That is based on general relativity. Doppler boosting comes out of special relativity, doesn't need all that messing around with gravity...

"This is the first time that this aspect of Einstein's theory of relativity has been used to discover a planet," research team member Tsevi Mazeh of Tel Aviv University in Israel said in a statement.
(emphasis mine)

IIRC Doppler boosting has been detected for other exoplanets, not as a discovery method though.
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Re: Kepler-76 (KIC 4570949) - Hot Jupiter with evidence for atmospheric superrotation

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