Results 71 to 80 of about 269 (181)

Extrasolar planets : - From gaseous giant planets to rocky planets. - Steps towards the detection of life biomarkers.

, 2017
Discoveries done during the last two decades have revealed the impressive diversity of extrasolar planetary systems. A diversity challenging our understanding of  mechanisms of formation and evolution.
Mayor, Michel
core  

Searching for Planets Orbiting Vega with the James Webb Space Telescope

The Astronomical Journal
The most prominent of the IRAS debris disk systems, α Lyrae (Vega), at a distance of 7.7 pc, has been observed by both the NIRCam and MIRI instruments on the James Webb Space Telescope.
Charles Beichman, Geoffrey Bryden, Jorge Llop-Sayson, Marie Ygouf, Alexandra Greenbaum, Jarron Leisenring, Andras Gaspar, John Krist, George Rieke, Schuyler Wolff, Kate Su, Klaus Hodapp, Michael Meyer, Doug Kelly, Martha Boyer, Doug Johnstone, Scott Horner, Marcia Rieke   +17 more
doaj   +1 more source

The SOPHIE search for northern extrasolar planets XI. Three new companions and an orbit update: Giant planets in the habitable zone

, 2016
International audienceWe report the discovery of three new substellar companions to solar-type stars, HD191806, HD214823, and HD221585, based on radial velocity measurements obtained at the Haute-Provence Observatory.
Ehrenreich, D., X. Delfosse, Borgniet, S., Santos, N. C., N. Astudillo-Defru, Bourrier, V., Pepe, F., M. Mayor, F. Pepe, Udry, S., P. A. Wilson, T. Forveille, C. Moutou, Mayor, M., Boisse, I., Moutou, C., Astudillo-Defru, N., Beuzit, J. -L., M. Deleuil, Arnold, L., Forveille, T., Sahlmann, J., N. C. Santos, Diaz, R. F., Segransan, D., L. Arnold, Hébrard, G., Delfosse, X., Queloz, D., R. F. Díaz, J.-L. Beuzit, Rey, J., I. Boisse, D. Queloz, D. Ségransan, X. Bonfils, J. Rey, D. Ehrenreich, O. Demangeon, A. Santerne, Santerne, A., F. Bouchy, Bonfils, X., A.-M. Lagrange, Deleuil, M., Bouchy, F., G. Hébrard, V. Bourrier, Courcol, B., B. Courcol, Demangeon, O., J. Sahlmann, S. Udry, Wilson, P. A., Lagrange, A. -M., S. Borgniet   +55 more
core   +1 more source

The SOPHIE search for northern extrasolar planets . I. A companion around HD 16760 with mass close to the planet/brown-dwarf transition

, 2009
International audienceWe report on the discovery of a substellar companion or a massive Jupiter orbiting the G5V star HD 16760 using the spectrograph SOPHIE installed on the OHP 1.93-m telescope.
Hébrard, G., Delfosse, X., F. Pont, Ehrenreich, D., C. Lovis, A. Vidal-Madjar, Queloz, D., X. Delfosse, H. Le Coroller, Desort, M., Santos, N. C., I. Boisse, D. Queloz, A. M. Lagrange, D. Ségransan, X. Bonfils, Pepe, F., Le Coroller, H., Ségransan, D., D. Ehrenreich, F. Pepe, Udry, S., Pont, F., Eggenberger, A., M. Desort, Vidal-Madjar, A., F. Bouchy, T. Forveille, C. Moutou, Bonfils, X., Boisse, I., Moutou, C., Bouchy, F., G. Hébrard, A. Eggenberger, Perrier, C., Lovis, C., S. Udry, Forveille, T., N. C. Santos, Lagrange, A. M., C. Perrier   +41 more
core   +1 more source

The Evolution of Jupiter and Saturn as a Function of the Rρ Parameter

The Astrophysical Journal
Computed using the APPLE planetary evolution code, we present updated evolutionary models for Jupiter and Saturn that incorporate helium rain, nonadiabatic thermal structures, and “fuzzy” extended heavy-element cores.
Ankan Sur, Adam Burrows, Roberto Tejada Arevalo, Yubo Su   +3 more
doaj   +1 more source

The nature of the Neptune-like planets orbiting close solar type stars

, 2020
The sample of known exoplanets is strongly biased to masses larger than the ones of the giant gaseous planets of the Solar System. Recently, the discovery of two extrasolar planets of considerably lower masses around the nearby Stars GJ 436 and ρ Cancri ...
Brunini, Adrián, Cionco, Rodolfo Gustavo   +1 more
core  

Evolution of Semiconvective Staircases in Rotating Flows: Consequences for Fuzzy Cores in Giant Planets

The Astrophysical Journal Letters
Recent observational constraints on the internal structure of Jupiter and Saturn suggest that these planets have “fuzzy” cores, i.e., gradients of the concentration of heavy elements that might span a large fraction of the planet’s radius.
J. R. Fuentes, Bradley W. Hindman, Adrian E. Fraser, Evan H. Anders   +3 more
doaj   +1 more source

Simulations of giant planet migration in gaseous circumstellar disks

, 2004
Thesis (Ph. D.)--University of Washington, 2004This work describes the construction, performance, analysis and results of smoothed-particle hydrodynamics simulations of gas disks around Sun-like stars. We provide a history of the Solar System and present
Lufkin, Graeme, 1977-
core  

Dynamical Aspects of Exoplanetary Systems [PDF]

, 2013
PhDThe detection of more than 130 multiple planet systems makes it necessary to interpret a broader range of properties than are shown by our Solar system.
Campanella, Giammarco
core  

Structure and evolution of the first CoRoT exoplanets: probing the brown dwarf/planet overlapping mass regime

, 2009
We present detailed structure and evolution calculations for the first transiting extrasolar planets discovered by the space-based CoRoT mission. Comparisons between theoretical and observed radii provide information on the internal composition of the ...
T. Barman, I. Baraffe, G. Chabrier, J. Leconte, B. Levrard   +4 more
core   +1 more source