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PostPosted: Fri Feb 09, 2018 2:32 pm 
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Joined: Tue Aug 12, 2008 1:16 pm
Posts: 207
The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood

"We ... reveal that stars with similar ages and metallicities have nearly identical abundance patterns. Contrary to previous results, we find that the ratios of carbon-to-oxygen and magnesium-to-silicon are homogeneous to within 10% throughout the solar neighborhood, implying that exoplanets may exhibit much less compositional diversity than previously thought. Finally, we demonstrate that the Sun has a subtle deficiency in refractory material relative to ~95% of solar twins, suggesting a possible signpost for planetary systems like our own."


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PostPosted: Thu Feb 15, 2018 1:39 pm 
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Cometary impactors on the TRAPPIST-1 planets can destroy all planetary atmospheres and rebuild secondary atmospheres on planets f, g, h

What it says.


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PostPosted: Mon Feb 19, 2018 12:35 pm 
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Joined: Tue Aug 12, 2008 1:16 pm
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Impact of Gas Giant Instabilities on Habitable Planets

"Planetary systems consisting of two giant planets are fairly benign to terrestrial planets, whereas six giant planets very often lead to a complete clearing of the habitable zone. Systems with initial distances of five Hill Radii between the giant planets have a high chance to harbour a habitable planet, although more compact systems are very destructive. The giant planet masses have a smaller impact on the stability of habitable worlds. ... As a rule of thumb, observed gas giants with eccentricities higher than 0.4 and inclinations higher than 20 degrees have experienced strong planet-planet scatterings and are unlikely to have a habitable planet in its system. Furthermore, it was found that habitable planets surrounding a K or M-star have a higher survival rate than those surrounding a G-star."


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