Astronomers spot most Earth-like planet yet
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Apr 23, 2014
From other reports of the Kepler 186 system with bigger planets closer to the star, it is likely that the system condensed from the disc that formed the star & grew from the outside in with the objects in the disc growing & migrating inward with time.
It therefore appears that the system is a series of gas giants arrested in condensation when the star switched ON (result creates the bulk of the hot Jupiters seen in planet lists, such as the interior of 55Cnc for example.
It is likely therefore that instead of being a slightly bigger then earth mass dry rock, it is instead a Titanide, with interior rock & metal core, a thick shell of water & a thick atmosphere of N2 & CH4 with noble gases, SiH4, H2S & PH3 as trace gases along with H2O clouds in the atmosphere above the ocean. NH3 in this system would be dissolved in the H2O.
N2 & CH4 exsolves from complex organics at considerable depth, however insoluble organics may produce a thick oil/tar shell several metres thick above the ocean.
Bigger titanides become small gas giants, with Uranus & Neptune being end members on the upper end of the mass scale, Uranus being pristine condensed out of a disc, and Neptune being dumped on by a large number of comets & therefore denser.
As a result of condensation out of a disc beginning small and growing as it migrated inward, the Titanide in this case should retain a gas giant element abundance. There should ALSO be another smaller Titanide smaller then Earth further out in the next orbital resonance bin (may be hard to see on transit details as the orbital period would be longer, & the planet smaller). The outer titanide would likely be cool enough for ice on the Ocean surface, but the CH4 may greenhouse it to liquid H2O.
Have a nice day: Ag
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