Search results for "Circumstellar habitable zone"

showing 3 items of 3 documents

Diving into exoplanets: Are water seas the most common?

2019

One of the basic tenets of exobiology is the need for a liquid substratum in which life can arise, evolve, and develop. The most common version of this idea involves the necessity of water to act as such a substratum, both because that is the case on Earth and because it seems to be the most viable liquid for chemical reactions that lead to life. Other liquid media that could harbor life, however, have occasionally been put forth. In this work, we investigate the relative probability of finding superficial seas on rocky worlds that could be composed of nine different, potentially abundant, liquids, including water. We study the phase space size of habitable zones defined for those substance…

010504 meteorology & atmospheric sciencesExtraterrestrial EnvironmentMilky WayOrigin of LifePlanets01 natural sciencesAstrobiologyAbundance (ecology)Planet0103 physical sciencesExobiology010303 astronomy & astrophysicsEcosystem0105 earth and related environmental sciencesProbabilityExoseasModels StatisticalHabitable zoneExoplanetsLead (sea ice)WaterAgricultural and Biological Sciences (miscellaneous)ExoplanetTidal lockingSpace and Planetary ScienceSolventsAstrophysics::Earth and Planetary AstrophysicsRelative probabilityCircumstellar habitable zoneGeology
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Oxygen and the Exploration of the Universe

2010

Humankind has begun, in a tentative way, the immense project of exploring, and perhaps colonizing, other worlds. The grand enterprise has hardly begun and will certainly suffer many defeats and reversals, but it seems destined to go forward. In the course of this, both in seeking life in extraterrestrial environments and voyaging into them, we shall encounter a number of problems concerning the existence or provision of oxygen. The basis for this has been described in previous chapters. First, we would like to summarize arguments as to why life could have evolved on other planets. We need to know what to expect.

HistoryPlanetNeed to knowGiant planetTerrestrial planetExtraterrestrial EnvironmentCircumstellar habitable zoneAstrobiology
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HADES RV Programme with HARPS-N at TNG. IV. Time resolved analysis of the Ca II H&K and Hα chromospheric emission of low-activity early-type M dwarfs

2016

Context. M dwarfs are prime targets for current and future planet search programs, particularly those focused on the detection and characterization of rocky planets in the habitable zone. In this context, understanding their magnetic activity is important for two main reasons: it affects our ability to detect small planets and it plays a key role in the characterization of the stellar environment. Aims: We analyze observations of the Ca II H&K and Hα lines as diagnostics of chromospheric activity for low-activity early-type M dwarfs. Methods: We analyze the time series of spectra of 71 early-type M dwarfs collected in the framework of the HADES project for planet search purposes. The HARPS-…

Rotation periodPhysics010504 meteorology & atmospheric sciencesAstronomy and AstrophysicsContext (language use)Astrophysics01 natural sciencesK-lineSpectral lineStarsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary Science0103 physical sciencesTerrestrial planetAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary Astrophysics010303 astronomy & astrophysicsCircumstellar habitable zone0105 earth and related environmental sciencesLine (formation)
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