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PostPosted: Tue May 23, 2017 1:42 pm 
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Posts: 181
Neutron Star Planets: Atmospheric processes and habitability

The Drake Equation as a Function of Spectral Type and Time

"We suggest that the maximum lifetime of communicative civilizations depends on the spectral type of the host star, which implies that F- and G-dwarf stars are the best places to search for signs of technological intelligence today."

Why do we find ourselves around a yellow star instead of a red star?

"In this paper we analyze this problem through Bayesian inference to demonstrate that our occurrence around a G-dwarf might be a slight statistical anomaly, but only the sort of chance event that we expect to occur regularly."


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PostPosted: Fri May 26, 2017 1:25 pm 
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No snowball on habitable tidally locked planets

"We show that tidally locked planets are unlikely to exhibit a snowball bifurcation as a direct result of the spatial pattern of insolation they receive. Instead they will smoothly transition from partial to complete ice coverage and back. A major implication of this work is that tidally locked planets with an active carbon cycle should not be found in a snowball state. Moreover, this work implies that tidally locked planets near the outer edge of the habitable zone with low CO2 outgassing fluxes will equilibrate with a small unglaciated substellar region rather than cycling between warm and snowball states."


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PostPosted: Tue May 30, 2017 12:30 pm 
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On the Spin States of Habitable Zone Exoplanets Around M Dwarfs: The Effect of a Near-Resonant Companion

"...we find that a planetary companion near a mean-motion resonance can excite the spin states of planets in the habitable zone of small, cool stars, pushing otherwise synchronously rotating planets into higher amplitude librations of the spin state, or even complete circulation resulting in effective stellar days with full surface coverage on the order of years or decades."


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PostPosted: Tue Jun 13, 2017 12:59 pm 
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Constraining the Compositions of the TRAPPIST-1 Planets to Trace Snow Lines and Migration in M Dwarf Disks

On the Age of the TRAPPIST-1 System

"...conclude that TRAPPIST-1 is a transitional thin/thick disk star with an age of 7.6±2.2 Gyr."


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PostPosted: Thu Jun 22, 2017 1:33 pm 
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The Detectability of Radio Auroral Emission from Proxima B

Comparative Climates of TRAPPIST-1 planetary system: results from a simple climate-vegetation model

"...TRAPPIST-1d seems to be the most stable from an Earth-like perspective, since it resides in the surface water zone for a wide range of reasonable values of the model parameters. Moreover, according to the model outer planets (f, g and h) cannot host liquid water on their surfaces, even for Earth-like conditions, entering a snowball state."

Stable habitable zones of single Jovian planet systems

"We find that small, Earth-mass planets can maintain stable orbits in cases where the habitable zone is largely, or partially, unperturbed by a nearby Jovian, and that mutual gravitational interactions and resonant mechanisms are capable of producing stable orbits even in habitable zones that are significantly or completely disrupted by a Jovian."


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