Results 31 to 40 of about 372,922 (156)

The stability of short-period extrasolar giant planets [PDF]

, 2008
A three-dimensional coupled thermosphere-ionosphere model for extrasolar giant planets (EXOTIM) has been developed. This is the first such model reported in the literature.
Koskinen, T.T.
core  

The Process We Call Earth: Relationships Between Dynamic Feedbacks and the Search for Gaiasignatures in a New Paradigm of Earthlikeness

Perspectives of Earth and Space Scientists, Volume 5, Issue 1, December 2024.
Abstract Standard notions of an “Earthlike” planet rely solely on physical and material properties, like planetary mass, radius, and surface temperature. Here, we introduce a novel, relational perspective on what defines “Earthlikeness.” In our process‐based framework, rocky planets are local pockets of free energy that have the potential to drive the ...
Michael L. Wong, Marissa Duckett, Emilia S. Hernandez, Vahab Rajaei, Kayla J. Smith   +4 more
wiley   +1 more source

Comparative terrestrial atmospheric circulation regimes in simplified global circulation models. Part I: From cyclostrophic super‐rotation to geostrophic turbulence

Quarterly Journal of the Royal Meteorological Society, Volume 144, Issue 717, Page 2537-2557, October 2018 Part B., 2018
The regimes of global atmospheric circulation patterns in an Earth‐like atmosphere are explored as a function of rotation rate Ω, thermal contrast, and other parameters expressed in dimensionless form, using a simplified GCM based on the University of Hamburg's Portable University Model for the Atmosphere.
Yixiong Wang, Peter L. Read, Fachreddin Tabataba‐Vakili, Roland M. B. Young   +3 more
wiley   +1 more source

The influence of galactic cosmic rays on ion-neutral hydrocarbon chemistry in the upper atmospheres of free-floating exoplanets [PDF]

, 2014
The authors highlight financial support of the European Community under the FP7 by an ERC starting grant.Cosmic rays may be linked to the formation of volatiles necessary for prebiotic chemistry.
P. B. Rimmer, C. Bilger, Rimmer, P.B., Helling, C., Bilger, C., Ch. Helling   +5 more
core   +1 more source

Planet–Planet Scattering Explains the Mass–Eccentricity Relation of Warm Jupiters

The Astrophysical Journal Letters
Warm Jupiters—giant planets with orbital periods of ∼10–365 days—exhibit a positive correlation between mass and eccentricity. We interpret this trend as the outcome of planet–planet scattering, representing a transition from collision-dominated ...
Jiayin Dong, Eve J. Lee, Eiichiro Kokubo, Ruth Murray-Clay, Arvind Gupta, Gavin Turner   +5 more
doaj   +1 more source

TOI-1859b: A 64 Day Warm Jupiter on an Eccentric and Misaligned Orbit

The Astrophysical Journal Letters, 2023
Warm Jupiters are close-in giant planets with relatively large planet–star separations (i.e., 10 < a / R _⋆ < 100). Given their weak tidal interactions with their host stars, measurements of stellar obliquity may be used to probe the initial obliquity ...
Jiayin Dong, Songhu Wang, Malena Rice, George Zhou, Chelsea X. Huang, Rebekah I. Dawson, Gudmundur K. Stefánsson, Samuel Halverson, Shubham Kanodia, Suvrath Mahadevan, Michael W. McElwain, Jaime A. Alvarado-Montes, Joe P. Ninan, Paul Robertson, Arpita Roy, Christian Schwab, Sarah E. Logsdon, Ryan C. Terrien, Karen A. Collins, Gregor Srdoc, Ramotholo Sefako, Didier Laloum, David W. Latham, Allyson Bieryla, Paul A. Dalba, Diana Dragomir, Steven Villanueva Jr., Steve B. Howell, George R. Ricker, S. Seager, Joshua N. Winn, Jon M. Jenkins, Avi Shporer, David Rapetti   +33 more
doaj   +1 more source

Possibility of Detection of Exomoons with Inclined Orbits Orbiting Pulsar Planets Using the Time‐of‐Arrival Analysis

Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014
The perturbation caused by planet‐moon binarity on the time‐of‐arrival (TOA) signal of a pulsar with an orbiting planet is derived for the case of the orbit of the planet‐moon system inclined of an angle α with respect to the plane of the orbit of the planet‐moon barycenter around the pulsar.
Antonio Pasqua, Khudhair A. Assaf, Gary Wegner   +2 more
wiley   +1 more source

Direct Imaging Constraints on Binary Planets and Exomoons around Epsilon Indi A b

The Astronomical Journal
Epsilon Indi A b (hereafter Eps Ind A b) is a directly imaged ∼6 M _Jup exoplanet orbiting a nearby (3.6 pc) K dwarf at ∼30 au. We analyze archival JWST/MIRI 15 μ m coronagraphic imaging of this planet to search for directly imaged satellites orbiting ...
Matson C. Garza, Mary Anne Limbach, Rachel Bowens-Rubin, Matthew De Furio, Elisabeth C. Matthews, Kyle Franson, Sarah C. Millholland, Logan A. Pearce, Andrew Vanderburg   +8 more
doaj   +1 more source

Knudsen effusion mass spectrometry: Current and future approaches

Rapid Communications in Mass Spectrometry, Volume 38, Issue 14, 30 July 2024.
Rationale Knudsen effusion mass spectrometry (KEMS) has been a powerful tool in physical chemistry since 1954. There are many excellent reviews of the basic principles of KEMS in the literature. In this review, we focus on the current status and potential growth areas for this instrumental technique.
Nathan S. Jacobson, Jean‐Yves Colle, Valentina Stolyarova, Torsten Markus, Ioana Nuta   +4 more
wiley   +1 more source

On the Exoplanet Yield of Gaia Astrometry

The Astronomical Journal
We reexamine the expected yield of Gaia astrometric planet detections using updated models for giant-planet occurrence, the local stellar population, and Gaia’s demonstrated astrometric precision. Our analysis combines a semianalytic model that clarifies
Caleb Lammers, Joshua N. Winn
doaj   +1 more source