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PostPosted: Fri May 01, 2020 2:24 pm 
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Posts: 323
Solar System Physics for Exoplanet Research

"... In this review, we describe our current understanding of the Solar system for the exoplanetary science community - with a focus on the processes thought to have shaped the system we see today. In section one, we introduce the Solar system as a single well studied example of the many planetary systems now observed. In section two, we describe the Solar system's small body populations as we know them today - from the two hundred and five known planetary satellites to the various populations of small bodies that serve as a reminder of the system's formation and early evolution. In section three, we consider our current knowledge of the Solar system's planets, as physical bodies. In section four, we discuss the research that has been carried out into the Solar system's formation and evolution, with a focus on the information gleaned as a result of detailed studies of the system's small body populations. In section five, we discuss our current knowledge of planetary systems beyond our own - both in terms of the planets they host, and in terms of the debris that we observe orbiting their host stars. ..."

Invited review, 197 pages, lots of color figures (with some black and white versions in an appendix).


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PostPosted: Sat May 02, 2020 3:37 am 
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Atmospheric dynamics on terrestrial planets with eccentric orbits

"... In this study, using an idealized general circulation model, we examine the climate response to changes in eccentricity for both zero and non-zero obliquity planets...."


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PostPosted: Thu May 21, 2020 12:50 am 
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The Effect of Seafloor Weathering on Planetary Habitability

"... Earth-like planets have two equilibrium climate states: (i) an ice-free state where outgassing is balanced by both weathering types, and (ii) an ice-covered state where outgassing is balanced by seafloor weathering alone. ... For some planets, neither state exists, and the climate cycles between ice-covered and ice-free states. For some other planets, both equilibria exist, and the climate depends on the initial conditions. Insolation increases over time due to stellar evolution, so a planet usually encounters the ice-covered equilibrium first. Such a planet will remain ice-covered, even if the ice-free state appears subsequently, unless the climate receives a large perturbation. The ice-covered equilibrium state covers a large fraction of phase space for Earth-like planets. Many planets conventionally assigned to a star's habitable zone may be rendered uninhabitable as a result."

An Objective Bayesian Analysis of Life’s Early Start and Our Late Arrival

"... It is then shown that the earliest microfossil evidence for life indicates that the rate of abiogenesis is at least 2.8 times more likely to be a typically rapid process, rather than a slow one. This modest limiting Bayes factor rises to 8.7 if we accept the more disputed evidence of C13 depleted zircon deposits (Bell et al. 2015). For intelligence evolution, it is found that a rare-intelligence scenario is slightly favored at 3:2 betting odds. Thus, if we re-ran Earth's clock, one should statistically favor life to frequently re-emerge, but intelligence may not be as inevitable."


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PostPosted: Thu May 28, 2020 1:25 pm 
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Qualitative classification of extraterrestrial civilizations

"... We propose a classification based on the abilities of [ExtraTerrestrial Civilizations] to modify their environment and to integrate with it: Class 0 uses the environment as it is, Class 1 modifies the it [sic] to fit its needs, Class 2 modifies itself to fit the environment and Class 3 ETC is fully integrated with the environment. Combined with the classical Kardashev's scale our scheme forms a 2d scheme for interpreting ETC properties. The new framework makes it obvious that the available energy is not an unique measure of ETCs, it may not even correlate with how well that energy is used...."


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PostPosted: Fri May 29, 2020 12:55 pm 
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The Effect of Substellar Continent Size on Ocean Dynamics of Proxima Centauri b

"... In this work, we investigate how the size of a substellar land mass affects the oceans ability to transport heat and upwell nutrients on the tidally locked planet Proxima Centauri b using the ROCKE-3D coupled ocean-atmosphere General Circulation Model (GCM)...."


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PostPosted: Sun May 31, 2020 1:16 am 
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Revisiting Proxima with ESPRESSO

"... We confirm the presence of Proxima b independently in the ESPRESSO data. The ESPRESSO data on its own shows Proxima b at a period of 11.218 ± 0.029 days, with a minimum mass of 1.29 ± 0.13 Me. In the combined dataset we measure a period of 11.18427 ± 0.00070 days with a minimum mass of 1.173 ± 0.086 Me. ..."


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PostPosted: Tue Jun 02, 2020 12:37 pm 
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Aquatic Biospheres On Temperate Planets Around Sun-like Stars And M-dwarfs

" ... We investigate the properties of aquatic biospheres comprising Earth-like biota for habitable rocky planets orbiting Sun-like stars and late-type M-dwarfs such as TRAPPIST-1. ..."


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PostPosted: Thu Jun 11, 2020 1:03 pm 
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The effect of varying atmospheric pressure upon habitability and biosignatures of Earth-like planets

"... Therefore, the aim of the present study is to understand the influence of atmospheric mass on climate, hence habitability, and the spectral appearance of planets with Earth-like, that is, N2-O2 dominated, atmospheres orbiting the Sun at 1 Astronomical Unit. ... Increasing the surface pressure up to 4 bar leads to an increase in the surface temperature due to increased greenhouse warming. Above this point, Rayleigh scattering dominates and the surface temperature decreases, reaching surface temperatures below 273K (approximately at ~34 bar surface pressure)...."


Mineral dust increases the habitability of terrestrial planets but confounds biomarker detection

" ... On tidally-locked planets, dust cools the day-side and warms the night-side, significantly widening the habitable zone. Independent of orbital configuration, we suggest that airborne dust can postpone planetary water loss at the inner edge of the habitable zone, through a feedback involving decreasing ocean coverage and increased dust loading...."


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PostPosted: Wed Jul 08, 2020 1:26 pm 
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A review of possible planetary atmospheres in the TRAPPIST-1 system

"... Here we have compiled a state-of-the-art overview of all the observational and theoretical constraints that have been obtained so far using these techniques and approaches. The goal is to get a better understanding of whether or not TRAPPIST-1 planets can have atmospheres, and if so, what they are made of. For this, we surveyed the literature on TRAPPIST-1 about topics as broad as irradiation environment, orbital architecture, transit observations, density measurements, stellar contamination, and numerical climate and escape models."


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PostPosted: Mon Jul 13, 2020 11:49 pm 
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Habitability Models for Planetary Sciences

"... Ecologists have been using Habitat Suitability Models (HSMs) for more than four decades to study the habitability of Earth from local to global scales. Astrobiologists have been proposing different habitability models for some time, with little integration and consistency between them and different in function to those used by ecologists. In this white paper, we suggest a mass-energy habitability model as an example of how to adapt and expand the models used by ecologists to the astrobiology field...."

Lots of good references, many from the ecological (rather than astrobiological) literature.


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