Results 51 to 60 of about 26,515 (184)

Pervasive Orbital Eccentricities Dictate the Habitability of Extrasolar Earths

, 2010
The long-term habitability of Earth-like planets requires low orbital eccentricities. A secular perturbation from a distant stellar companion is a very important mechanism in exciting planetary eccentricities, as many of the extrasolar planetary systems ...
Kita, Ryosuke, Rasio, Frederic A., Takeda, Genya   +2 more
core   +1 more source

Is the Uranus Heat Flow Puzzling?

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract The low internal heat flow of Uranus has been confirmed and determined for the first time. It may be representative of the average rather than a fluctuation due to the unusual seasonal or condensation cycles. The very different value for Neptune suggests that these two bodies have different formations or evolutions.
David J. Stevenson
wiley   +1 more source

Propagation and Transmission of Jupiter’s Internal Waves

The Astrophysical Journal
Observations from the Juno spacecraft show that Jupiter has a large dilute core rather than a compact core. To investigate the effects of different core structures on wave propagation and transmission in Jupiter’s interior, we consider three models: (1 ...
Yuru Xu, Xing Wei
doaj   +1 more source

Origin and early evolution of terrestrial planet atmospheres and oceans

Terrestrial, Atmospheric and Oceanic Sciences, 2019
Planet atmospheric compositions are determined by the availability of a gas species, its molecular weight and the mass (or gravity force) of a planet. Both Mercury and the Moon are not massive enough to hold any gas species to form an atmosphere.
Lin-gun Liu
doaj   +1 more source

The formation and habitability of terrestrial planets in the presence of hot jupiters

, 2004
`Hot jupiters,' giant planets with orbits very close to their parent stars, are thought to form farther away and migrate inward via interactions with a massive gas disk.
Alibert, Armitage, Atobe, Boss, Briceño, Chambers, Chambers, Chambers, D'Angelo, Forrest, Gonzalez, Hayashi, Jonathan I. Lunine, Kasting, Kokubo, Kuchner, Laws, Levison, Levison, Lin, Lineweaver, Lineweaver, Lissauer, Lufkin, Mandell, Marcy, Matsuyama, Mayer, McArthur, Morbidelli, Nelson, Pollack, Quillen, Raymond, Raymond, Rice, Rice, Sean N. Raymond, Tanaka, Terquem, Thomas Quinn, Thébault, Ward, Wetherill   +43 more
core   +1 more source

The Invisible Majority? Evolution and Detection of Outer Planetary Systems without Gas Giants [PDF]

, 2010
We present 230 realizations of a numerical model of planet formation in systems without gas giants. These represent a scenario in which protoplanets grow in a region of a circumstellar disk where water ice condenses (the "ice line''), but fail to accrete
Gaidos, Eric, Gaudi, B. Scott, Mann, Andrew W.   +2 more
core   +3 more sources

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

A Pan-STARRS1 Search for Planet Nine

The Astronomical Journal
We present a search for Planet Nine using the second data release of the Pan-STARRS1 survey. We rule out the existence of a Planet Nine with the characteristics of that predicted in Brown & Batygin to a 50% completion depth of V = 21.5.
Michael E. Brown, Matthew J. Holman, Konstantin Batygin   +2 more
doaj   +1 more source

Rotation Reduces Convective Mixing in Jupiter and Other Gas Giants

The Astrophysical Journal Letters, 2023
Recent measurements of Jupiter’s gravitational moments by the Juno spacecraft and seismology of Saturn’s rings suggest that the primordial composition gradients in the deep interior of these planets have persisted since their formation.
J. R. Fuentes, Evan H. Anders, Andrew Cumming, Bradley W. Hindman   +3 more
doaj   +1 more source

Rotation of the Solar System planets and the origin of the Moon in the context of the tidal downsizing hypothesis

, 2010
It has been proposed recently that the first step in the formation of both rocky and gas giant planets is dust sedimentation into a solid core inside a gas clump (giant planet embryo). The clumps are then assumed to migrate closer to the star where their
Binder, Boley, Bondi, Boss, Boss, Canup, Canup, De Meijer, Dones, Giuli, Harris, Hartmann, Lubow, Nayakshin, Nayakshin, Pahlevan, Pollack, Sergei Nayakshin, Shakura, Vorobyov, Wetherill, Wiechert   +21 more
core   +1 more source