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Annual Review of Astronomy and Astrophysics 49, 67-117. (2011) Protoplanetary disks and their evolution. Astronomy & Astrophysics, in press.į, Bolmont E, Forget F, Ribas I, Raymond SN, Anglada-Escude G. Irradiation, rotation and volatile inventory from formation to the present. (2016) The habitability of Proxima Centauri b I. Monthly Notices of the Royalį, Reiners A, Leconte J, Raymond SN, Engle SG, Guinan EF, Morin J, Turbet M,įorget F, Anglada-Escude G. Of terrestrial-mass planets in the HZ of M Dwarfs. (2016) The habitability of Proxima Centauri b: II:Įnvironmental states and observational discriminants. J, Lincowski AP, Robinson T, Domagal-Goldman SD, Barnes RK, Fleming DP, Deitrick R, Luger R, Driscoll PE, Quinn TR, Crisp D. Meadows VS, Arney GN, Schwieterman E, Lustig-Yaeger Abstract: 2015AsBio.15.119Līeckons: Scientists say planet proves it’s a “Star Trek” universe. Abstract: 2013Natur.493.381KĮxtreme water loss and abiotic O 2 buildup on planets throughout the System disruption by Galactic perturbations to wide binary stars. Abstract: 2013ApJ.775.53H Kaib N, Raymond S, Duncan M. (2013) Testing in situ assembly with the Kepler planetħ75, 53. (2016) Tutorial models of the climate and habitability of Proxima Centauri b: A thin atmosphere is sufficient to distribute heat given low stellar flux. Observations of our nearest neighbor: Flares on Proxima Centauri. Monthly Notices of the Royal Astronomical Plausible formation scenarios for the planet candidate orbiting ProximaĬentauri. Paardekooper SJ, Dreizler S, Giesers B, Anglada-Escude G.
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(2016) The habitability of Proxima Centauri b I: Evolutionary scenarios. G, Crisp D, Domagal-Goldman SD, Lincowski A, Lustig-Yaeger J, Schwieterman E. R, Driscoll PE, Quinn TR, Fleming DP, Guyer B, McDonald DV, Meadows VS, Arney (2016) A terrestrial planet candidate in a temperate
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Anglada-Escude G, Amado PJ, Barnes J,īerdinas ZM, Butler RP, Coleman GAL, de la Cueva I, Dreizler S, Michael Endl M, The mass dependence between protoplanetary disks and their stellar hosts. This is the “habitable evaporated core” scenario, which Barnes & colleaguesĬonsider the likeliest of the three pathways to Eden.Īndrews SM, Rosenfeld KA, Kraus AL, Wilner DJ. Star then blew off the envelope and evaporated most of the water, and thus
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In the third pathway, Proxima b started its existenceĪs a gas dwarf with a hydrogen envelope comprising about 0.1% of its bulkĬomposition, plus a water inventory amounting to 4.5 Earth oceans. This bombardment re-hydrated the environment andĮnabled oceans and life. Proxima and the bright binary launched icy asteroids and comets on a collisionĬourse with the desert planet. Pathway, Proxima b achieved its present orbit in primordial times and sufferedĭesiccation as in the “Venus-like” case, but then a close passage involving Its atmosphere and water despite continuing flares and CMEs.
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After the star settledĭown on the main sequence, a close encounter between Proxima and Alpha CentauriĪB scattered the planet into its present orbit, where it managed to maintain Habitable zone, neatly avoiding ablation of volatiles. In one, Proxima b originallyįormed as an Earth-like planet on an orbit well outside the system’s mature Within thisĬase they find three pathways to a happy ending. Quantities of water escaped photolysis (with that possibility defining the “water and oxygen, but uninhabitable”Īuthors devote the most time and space to the “Earth-like” case, consistent with their stated aims. The intensely oxidized environment would prevent the emergence of life, even if In the atmosphere and saturated global geochemistry. In the “abiotic oxygen” case, photolysis of the planet’s original waterĬontent led to a complete loss of hydrogen, while the liberated oxygen accumulated In the “Neptune-like” case, it is similarly desiccated and hellishly hot,īut the culprit is an extensive hydrogen envelope that failed to dissipate,Įither because the planet is more massive than 1.27 Mea or because the originalĮnvelope exceeded 1% of the bulk composition. In the “Venus-like” case, it retains a thick CO2 atmosphere but isĬompletely desiccated and uninhabitable. It is much dryer than Earth – more like Dune or Barsoom than a Cryogenian snowball or a Carboniferous jungle. Planet avoids a hydrogen greenhouse and retains a small quantity of water, but Discuss seven possible atmospheric states for Proxima b in the present epoch.