Results 1 to 10 of about 6,414 (152)

Ionization in atmospheres of brown dwarfs and extrasolar planets. IV. The effect of cosmic rays [PDF]

, 2013
Cosmic rays provide an important source for free electrons in Earth's atmosphere and also in dense interstellar regions where they produce a prevailing background ionization. We utilize a Monte Carlo cosmic ray transport model for particle energies of 10(
Helling, Christiane, Rimmer, Paul
core   +2 more sources

The long egress of GJ~436b's giant exosphere [PDF]

, 2017
The M dwarf GJ 436 hosts a transiting warm Neptune known to experience atmospheric escape. Previous observations revealed the presence of a giant hydrogen exosphere transiting the star for more than 5 h, and absorbing up to 56% of the flux in the blue ...
Berna, A. Gracia, Bourrier, V., Delfosse, X., Ehrenreich, D., Etangs, A. Lecavelier des, Heng, K., Lavie, B., Thomas, N., Udry, S., Vidal-Madjar, A., Wheatley, P. J.   +10 more
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Observability of hydrogen-rich exospheres in Earth-like exoplanets

, 2018
(Abridged) The existence of an extended neutral hydrogen exosphere around small planets can be used as an evidence for the presence of water in their lower atmosphere but, to date, such feature has not been securely detected in rocky exoplanets ...
Bourrier, Vincent, Ehrenreich, David, Kameda, Shingo, Santos, Leonardo A. dos   +3 more
core   +1 more source

Long-term variability of CO2 and O in the Mars upper atmosphere from MRO radio science data [PDF]

, 2015
We estimate the annual variability of CO2 and O partial density using approximately 6years of Mars Reconnaissance Orbiter (MRO) radio science data from August 2006 to January 2012, which cover three full Martian years (from the northern hemisphere summer
Fricke, Susan K., Genova, Antonio, Goossens, Sander, Lemoine, Frank G., Mazarico, Erwan, Smith, David E., Zuber, Maria T.   +6 more
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New observations of the extended hydrogen exosphere of the extrasolar planet HD209458b

, 2008
Atomic hydrogen escaping from the planet HD209458b provides the largest observational signature ever detected for an extrasolar planet atmosphere. However, the Space Telescope Imaging Spectrograph (STIS) used in previous observational studies is no ...
A. Lecavelier des Etangs, A. Vidal-Madjar, Ballester, Ben-Jaffel, Brown, Brown, C. D. Parkinson, Charbonneau, Charbonneau, D. Ehrenreich, Ehrenreich, Ford, G. E. Ballester, G. Hébrard, García-Muñoz, Henry, Holmström, Hubbard, J. C. McConnell, J.-M. Désert, Knutson, Lecavelier des Etangs, Lecavelier des Etangs, Moutou, R. Ferlet, Rauer, Schneiter, Seager, Tian, Tinetti, Vidal-Madjar, Vidal-Madjar, Vidal-Madjar, Wittenmyer, Yelle, Yelle   +35 more
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Reconciling the dawn-dusk asymmetry in Mercury's exosphere with the micrometeoroid impact directionality

, 2017
Combining dynamical models of dust from Jupiter Family Comets and Halley-type Comets, we demonstrate that the seasonal variation of the dust/meteoroid environment at Mercury is responsible for producing the dawn-dusk asymmetry in Mercury's exosphere ...
Janches, Diego, Pokorný, Petr, Sarantos, Menelaos   +2 more
core   +1 more source

Modeling magnesium escape from HD209458b atmosphere [PDF]

, 2014
Transit observations in the MgI line of HD209458b revealed signatures of neutral magnesium escaping the upper atmosphere of the planet, while no atmospheric absorption was found in the MgII doublet.
Bourrier, V., Etangs, A. Lecavelier des, Vidal-Madjar, A.   +2 more
core   +2 more sources

Asymmetries in Mars' Exosphere: Implications for X-ray and ENA Imaging

, 2006
Observations and simulations show that Mars' atmosphere has large seasonal variations. Total atmospheric density can have an order of magnitude latitudinal variation at exobase heights.
A.F. Nagy, J. Candy, J.A. Slavin, M. Holmström, M. Holmström, Mats Holmström, R.R Hodges Jr.   +6 more
core   +1 more source

Radiative braking in the extended exosphere of GJ436b

, 2015
The recent detection of a giant exosphere surrounding the warm Neptune GJ436 b has shed new light on the evaporation of close-in planets, revealing that moderately irradiated, low-mass exoplanets could make exceptional targets for studying this mechanism
Bourrier, Vincent, Ehrenreich, David, Etangs, Alain Lecavelier des   +2 more
core   +2 more sources

Sodium Atoms in the Lunar Exotail: Observed Velocity and Spatial Distributions [PDF]

, 2011
The lunar sodium tail extends long distances due to radiation pressure on sodium atoms in the lunar exosphere. Our earlier observations measured the average radial velocity of sodium atoms moving down the lunar tail beyond Earth (i.e., near the anti ...
E.J. Mierkiewicz, F.L. Roesler, Haffner, Huebner, J.K. Wilson, L.M. Haffner, Lee, Matta, Mendillo, Michael R. Line, Mierkiewicz, Mierkiewicz, Potter, Press, R.J. Oliversen, Smith, Stern, Tyler, Wilson, Wilson   +19 more
core   +4 more sources