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PostPosted: Wed Oct 16, 2019 1:05 pm 
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Posts: 290
How do Planetary Radius and Gravity Influence the Surface Climate of Earth-like Planets?

"... For planets of larger radii, the meridional atmospheric energy transport is weaker, which warms the tropics but cools high latitudes. For planets of larger gravities, the surface is globally cooler due to the fact that saturated vapor pressure depends on air temperature only and column water vapor mass is approximately equal to saturated vapor pressure over gravity multiplied by relative humidity. The relative humidity does not change much in our experiments. Ice albedo and water vapor feedbacks act to further amplify the effects of varying radius and gravity...."


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PostPosted: Thu Oct 31, 2019 2:27 pm 
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Exomoons in the habitable zones of M dwarfs

"... We find that 33 exoplanet candidates are located in the habitable zones of their host stars and that four of them could host Moon- to Titan-mass exomoons for timescales longer than the Hubble time."


An updated visual orbit of the directly-imaged exoplanet 51 Eridani b and prospects for a dynamical mass measurement with Gaia

"We present a revision to the visual orbit of the young, directly-imaged exoplanet 51 Eridani b using four years of observations with the Gemini Planet Imager. The relative astrometry is consistent with an eccentric (e=0.53 +0.09/−0.13) orbit at an intermediate inclination (i=136 +10/−11 deg), although circular orbits cannot be excluded due to the complex shape of the multidimensional posterior distribution. We find a semi-major axis of 11.1 +4.2/−1.3 au and a period of 28.1 +17.2/−4.9 yr, assuming a mass of 1.75M⊙ for the host star. ..."


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PostPosted: Fri Nov 01, 2019 1:11 pm 
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Principles Of Heliophysics: a textbook on the universal processes behind planetary habitability

"This textbook gives a perspective of heliophysics in a way that emphasizes universal processes from a perspective that draws attention to what provides Earth (and similar (exo-)planets) with a relatively stable setting in which life as we know it can thrive. The book is intended for students in physical sciences in later years of their university training and for beginning graduate students in fields of solar, stellar, (exo-)planetary, and planetary-system sciences.

"Comments: 419 pages, 119 figures, and 200 "activities" in the form of problems, exercises, explorations, literature readings, and "what if" challenges"


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PostPosted: Sun Nov 03, 2019 6:48 am 
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Life on Miller's Planet: The Habitable Zone Around Supermassive Black Holes

"In the science fiction film Interstellar, a band of intrepid astronauts sets out to explore a system of planets orbiting a supermassive black hole, searching for a world that may be conducive to hosting human life. While the film legitimately boasts a relatively high level of scientific accuracy, it is still restricted by Hollywood sensitivities and limitations. In this paper, we discuss a number of additional astrophysical effects that may be important in determining the (un)inhabitable environment of a planet orbiting close to a giant, accreting black hole. Foremost among these effects is the blueshift and beaming of incident radiation on the planet, due to the time dilation of an observer orbiting very close to the black hole. This results in high-energy flux incoming from surrounding stars and background radiation, with significant implications for habitability."

There's some pretty crazy stuff in here :) (it's based on an hour long talk the author gave, the link is on the arxiv page too).

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PostPosted: Mon Nov 11, 2019 2:35 pm 
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Habitable Zone Boundaries for Circumbinary Planets

"We use a one-dimensional (1-D) cloud-free climate model to estimate habitable zone (HZ) boundaries for terrestrial planets of masses 0.1 ME and 5 ME around circumbinary stars of various spectral type combinations...."


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PostPosted: Tue Nov 12, 2019 12:38 pm 
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Posts: 290
Characterizing Exoplanet Habitability

"... In this chapter, we describe how we can now determine which exoplanets are most likely to be terrestrial, and the research needed to help define the habitable zone under different assumptions and planetary conditions. We then move beyond the habitable zone concept to explore a new framework that looks at far more characteristics and processes, and provide a comprehensive survey of their impacts on a planet's ability to acquire and maintain habitability over time...."


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PostPosted: Wed Nov 13, 2019 12:57 pm 
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Revisited Mass-Radius relations for exoplanets below 120 Earth masses

"... We use the composition line of pure-water to separate the two populations, and infer two new empirical M-R relations based on this data: M=(0.9±0.06) R^(3.45±0.12) for the rocky population, and M=(1.74±0.38) R^(1.58±0.10) for the volatile-rich population...."


The Compositional Diversity of Low-Mass Exoplanets

"... we identify the bounds on planet compositions, where sizes and incident fluxes inform bulk planet properties...."


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PostPosted: Tue Nov 26, 2019 12:43 pm 
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Constraining the magnitude of climate extremes from time-varying instellation on a circumbinary terrestrial planet

"... We show that the amplitude of the temperature variation is largely constrained by the effective heat capacity, which corresponds to the ocean-to-land ratio on the planet. Planets with large ocean fractions should experience only modest warming and cooling of only a few degrees, which suggests that habitability cannot be precluded for such circumbinary planets. Planets with large land fractions that experience extreme periodic forcing could be prone to changes in temperature of tens of degrees or more, which could drive more extreme climate changes that inhibit continuously habitable conditions."


How to Characterize Habitable Worlds and Signs of Life

"... This review will show the latest results, the challenges of how to identify and characterize such habitable worlds, and how near-future telescopes will revolutionize the field...."


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PostPosted: Wed Dec 04, 2019 12:46 pm 
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Habitability on local, Galactic and cosmological scales

"The aim of this paper is to underline conditions necessary for the emergence and development of life. They are placed at local planetary scale, at Galactic scale and within the cosmological evolution, as pointed out by the Anthropic Cosmological Principle. We will consider the circumstellar habitable zone (CHZ) for planetary systems and a Galactic Habitable Zone (GHZ) including also a set of strong cosmological constraints to allow life (cosmological habitability (COSH)). ..."


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