منابع مشابه
Models of very-low-mass stars, brown dwarfs and exoplanets
Within the next few years, GAIA and several instruments aiming to image extrasolar planets will be ready. In parallel, low-mass planets are being sought around red dwarfs, which offer more favourable conditions, for both radial velocity detection and transit studies, than solar-type stars. In this paper, the authors of a model atmosphere code that has allowed the detection of water vapour in th...
متن کاملAtmosphere Models for Very Low Mass Stars, Brown Dwarfs and Exoplanets
Over the past decade considerable effort, both observational and theoretical, has been directed towards a more accurate determination of the stellar lower main sequence and of the sub-stellar domain covered by Brown Dwarfs and Planets. Astronomers have been looking for brown dwarfs for more than a decade, either with standard astronomical technics or with microlensing experiments. A breakthroug...
متن کاملTransient conditions for biogenesis on low-mass exoplanets with escaping hydrogen atmospheres
Exoplanets with lower equilibrium temperatures than Earth and primordial hydrogen atmospheres that evaporate after formation should pass through transient periods where oceans can form on their surfaces, as liquid water can form below a few thousand bar pressure and H2–H2 collision-induced absorption provides significant greenhouse warming. The duration of the transient period depends on the pl...
متن کاملRanges of Atmospheric Mass and Composition of Super-earth Exoplanets
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity. Here we model degassing during accretion to estimate the range of atmospheric mass and composition on exoplanets ranging from 1 to 30 Earth masses. We use bulk compositions drawn from primitive and differentiated me...
متن کاملScience with a lunar low-frequency array: From the dark ages of the Universe to nearby exoplanets
Low-frequency radio astronomy is limited by severe ionospheric distortions below 50 MHz and complete reflection of radio waves below 10–30 MHz. Shielding of man-made interference from long-range radio broadcasts, strong natural radio emission from the Earth’s aurora, and the need for setting up a large distributed antenna array make the lunar far side a supreme location for a low-frequency radi...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2009
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/701/2/1732