Kepler-11 : A compact six-planet system with mini-Neptunes

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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by Led_Zep on 4th March 2013, 7:01 am

http://arxiv.org/abs/1303.0227

All Six Planets Known to Orbit Kepler-11 Have Low Densities


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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by tommi59 on 4th March 2013, 8:00 am

Strange and slightly suspicious as planet c is now 4.5 times lighter .Previous estimates seems much closer to be truth.All new data only confirm my opinion the least dense minineptunes of all known
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TEMP

Post by Galzi on 5th March 2013, 2:19 pm

Led_Zep wrote:http://arxiv.org/abs/1303.0227

All Six Planets Known to Orbit Kepler-11 Have Low Densities



That's gross, planets c, e, f are more sort of mini-Saturn that mini-Neptune. Maybe the system had very little metals available during planets formation - but the host star, though old, seems to be of solar-like metallicity.

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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by Sirius_Alpha on 3rd May 2014, 3:49 am

Phase Curves of the Kepler-11 Multi-Planet System
http://arxiv.org/abs/1404.7538

The Kepler mission has allowed the detection of numerous multi-planet exosystems where the planetary orbits are relatively compact. The first such system detected was Kepler-11 which has six known planets at the present time. These kinds of systems offer unique opportunities to study constraints on planetary albedos by taking advantage of both the precision timing and photometry provided by Kepler data to monitor possible phase variations. Here we present a case study of the Kepler-11 system in which we investigate the phase modulation of the system as the planets orbit the host star. We provide predictions of maximum phase modulation where the planets are simultaneously close to superior conjunction. We use corrected Kepler data for Q1-Q17 to determine the significance of these phase peaks. We find that data quarters where maximum phase peaks occur are better fit by a phase model than a "null hypothesis" model.

(I've also extracted the Kepler-11 -related posts from the original main Kepler news and results thread.

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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by tommi59 on 1st November 2014, 5:16 am

I searched some data of kepler confirmed planets and Hadden gives parameters
Kepler 11 b mass 4.3 radius 1.71
Kepler 11 c mass 5.9 radius 2.73
Kepler 11 d mass 6.7 radius 2.97
Kepler 11 e mass 7.0 radius 3.98
Kepler 11 f mass 2.5 radius 2.37
Kepler 32 b mass 9.4 radius 2.25
Kepler 32 c mass 7.7 radius 2.02
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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by Led_Zep on 1st November 2014, 6:29 am

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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by Sirius_Alpha on 1st November 2014, 2:12 pm

Could you be more explicit?

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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by tommi59 on 1st November 2014, 4:01 pm

Data from Hadden are from 2014 seems to be more updated .It does not change low density nature of c-f planets
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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

Post by Sirius_Alpha on 21st November 2016, 9:56 pm

Kepler-11 is a Solar Twin: Revising the Masses and Radii of Benchmark Planets Via Precise Stellar Characterization
https://arxiv.org/abs/1611.06239

The six planets of the Kepler-11 system are the archetypal example of a population of surprisingly low-density transiting planets revealed by the Kepler mission. We have determined the fundamental parameters and chemical composition of the Kepler-11 host star to unprecedented precision using an extremely high quality spectrum from Keck-HIRES (R≃67,000, S/N per pixel≃260 at 600 nm). Contrary to previously published results, our spectroscopic constraints indicate that Kepler-11 is a young main-sequence solar twin. The revised stellar parameters raise the densities of the Kepler-11 planets by about 30%, making them more typical of the emerging class of "puffy" close-in exoplanets. We obtain photospheric abundances of 22 elements and find that Kepler-11 has an abundance pattern similar to that of the Sun with a slightly higher overall metallicity. We additionally analyze the Kepler lightcurves using a photodynamical model and discuss the tension between spectroscopic and transit/TTV-based stellar density estimates.

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Re: Kepler-11 : A compact six-planet system with mini-Neptunes

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