On the thermal atmosphere evaporation of hot neptune GJ 436b
نویسندگان
چکیده
منابع مشابه
High Metallicity and Non-Equilibrium Chemistry in the Dayside Atmosphere of Hot-Neptune Gj 436b
We present a detailed analysis of the dayside atmosphere of the hot-Neptune GJ 436b, based on recent Spitzer observations. We report statistical constraints on the thermal and chemical properties of the planetary atmosphere, study correlations between the various molecular species, and discuss scenarios of equilibrium and non-equilibrium chemistry in GJ 436b. We model the atmosphere with a one-...
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Warm Neptuneand sub-Neptune-sized exoplanets in orbits smaller than Mercury’s are thought to have experienced extensive atmospheric evolution. Here we propose that a potential outcome of this atmospheric evolution is the formation of helium-dominated atmospheres. The hydrodynamic escape rates of Neptuneand subNeptune-sized exoplanets are comparable to the diffusion-limited escape rate of hydrog...
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Neptune-sized extrasolar planets that orbit relatively close to their host stars — often called “hot Neptunes” — are common within the known population of exoplanets and planetary candidates. Similar to our own Uranus and Neptune, inefficient accretion of nebular gas is expected produce hot Neptunes whose masses are dominated by elements heavier than hydrogen and helium. At high atmospheric met...
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The nearby transiting system GJ 436b offers a unique opportunity to probe the structure and atmosphere of an extra-solar “hot Neptune”. In this Letter, we present the main results of observations covering two transit events with the NICMOS camera on the Hubble Space Telescope. The data consist of high-cadence time series of grism spectra covering the 1.1-1.9 μm spectral range. We find Rpl = 4.0...
متن کاملTransit infrared spectroscopy of the hot Neptune around GJ 436 with the Hubble Space Telescope★
The nearby transiting system GJ 436b offers a unique opportunity to probe the structure and atmosphere of an extra-solar “hot Neptune”. In this Letter, we present the main results of observations covering two transit events with the NICMOS camera on the Hubble Space Telescope. The data consist in high-cadence time series of grism spectra covering the 1.1-1.9 μm spectral range. We find Rpl = 4.0...
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ژورنال
عنوان ژورنال: Научные труды Института астрономии РАН
سال: 2020
ISSN: 2658-5669,2712-8318
DOI: 10.51194/inasan.2020.5.6.001