Results 81 to 90 of about 1,099 (180)

Cloud formation in 3D exoplanet atmospheres

As result of formation and evolution processes, exoplanets can have very different properties, e.g. giant gas planets, rocky planets, mini-neptunes and possibly carbon-rich planets. The understanding of these objects is, to a large extent, hampered by clouds obscuring their atmospheres. Clouds play a key role for the atmospheric dynamics and chemistry,
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Architectures of Exoplanetary Systems. IV. A Multiplanet Model for Reproducing the Radius Valley and Intrasystem Size Similarity of Planets around Kepler’s FGK Dwarfs

The Astrophysical Journal
The Kepler-observed distribution of planet sizes has revealed two distinct patterns: (1) a radius valley separating super-Earths and sub-Neptunes and (2) a preference for intrasystem size similarity.
Matthias Y. He, Eric B. Ford
doaj   +1 more source

Formation of stars, substellar objects and exoplanets : Observations of multiplicity [PDF]

, 2011
Many nearby stars are part of a binary or multiple system. Details about their history are preserved in their multiplicity characteristics, and observations of binary/multiple star systems provide a way to measure fundamental physical properties of the stars as well as clues to their formation and evolution.
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The discovery of exoplanets: towards understanding planet formation

Rendiconti Lincei. Scienze Fisiche e Naturali
Abstract The discovery of exoplanets has opened a new, very rich field in modern astronomy, allowing a much better insight into the characteristics of planets and the mechanisms for their formation than possible from only the observation of the Solar System.
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The case for a rectangular format space telescope for finding exoplanets

Frontiers in Astronomy and Space Sciences
We suggest that rectangular primary-mirror telescopes provide a clearer path to discovering habitable worlds than other designs currently being pursued. We show that a simple infrared (λ∼10 μm) telescope design with a rectangular mirror 20 m in length and 1 m in width, combined with technology already developed for JWST, can discover ∼11 habitable ...
Heidi Jo Newberg, Leaf Swordy, Richard K. Barry, Marina Cousins, Kerrigan Nish, Sarah Rickborn, Sebastian Todeasa   +6 more
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Terrestrial Exoplanet Internal Structure Constraints Enabled by Comprehensive Host Star Characterization Reveal That Terrestrial Planets in Mean Motion Resonances Are Water Rich

The Astrophysical Journal
Exoplanet mass and radius inferences fundamentally rely on host star mass and radius inferences. Despite the importance of host star mass, radius, and elemental abundance inferences for the derivation of exoplanet internal structure constraints ...
Alejandra Ross, Henrique Reggiani, Kevin C. Schlaufman, Mykhaylo Plotnykov, Diana Valencia   +4 more
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Insight into the Formation of β Pic b through the Composition of Its Parent Protoplanetary Disk as Revealed by the β Pic Moving Group Member HD 181327

The Astronomical Journal
It has been suggested that β Pic b has a supersolar metallicity and subsolar C/O ratio. Assuming solar carbon and oxygen abundances for the star β Pic and therefore the planet’s parent protoplanetary disk, β Pic b’s C/O ratio suggests that it formed via ...
Henrique Reggiani, Jhon Yana Galarza, Kevin C. Schlaufman, David K. Sing, Brian F. Healy, Andrew McWilliam, Joshua D. Lothringer, Laurent Pueyo   +7 more
doaj   +1 more source

Chemical Mapping of Temperate Sub-Neptune Atmospheres: Constraining the Deep Interior H2O/H2 Ratio from the Atmospheric CO2/CH4 Ratio

The Astrophysical Journal Letters
Understanding the planetary envelope composition of sub-Neptune-type exoplanets is challenging due to the inherent degeneracy in their interior composition scenarios.
Jeehyun Yang, Renyu Hu
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The Role of Formation Location in Shaping Sulfur-, Nitrogen-, and Carbon-bearing Species in Super-Earth and Sub-Neptune Atmospheres

The Astrophysical Journal
Atmospheric compositions of sub-Neptunes and super-Earths are often interpreted as tracers of formation location relative to volatile ice lines. However, prolonged magma oceans can chemically equilibrate with primordial atmospheres and modify accreted ...
Aaron Werlen, Remo Burn, Caroline Dorn, Lukas Felix, Annika Salmi   +4 more
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TOI-880 is an Aligned, Coplanar, Multiplanet System

The Astronomical Journal
Although many cases of stellar spin–orbit misalignment are known, it is usually unclear whether a single planet’s orbit was tilted or if the entire protoplanetary disk was misaligned.
Elina Y. Zhang, Huan-Yu Teng, Fei Dai, Andrew W. Howard, Samuel P. Halverson, Howard Isaacson, Ryan A. Rubenzahl, Xian-Yu Wang, Songhu Wang, Benjamin J. Fulton, Louise D. Nielsen, Jack Lubin, Steven Giacalone, Luke B. Handley, Erik A. Petigura, Emma V. Turtelboom, Alex S. Polanski, Steve R. Gibson, Kodi Rider, Arpita Roy, Ashley Baker, Jerry Edelstein, Christopher L. Smith, Josh Walawender, Joshua N. Winn   +24 more
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