Results 71 to 80 of about 21,297 (217)

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

Three-dimensional Orbital Architectures and Detectability of Adjacent Companions to Hot Jupiters

The Astrophysical Journal
The orbital properties of the (as yet) small population of hot Jupiters with nearby planetary companions provide valuable constraints on the past migration processes of these systems.
Thomas MacLean, Juliette Becker
doaj   +1 more source

Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions

The Astronomical Journal, 2023
Directly imaging temperate rocky planets orbiting nearby, Sun-like stars with a 6 m class IR/O/UV space telescope, recently dubbed the Habitable Worlds Observatory, is a high-priority goal of the Astro2020 Decadal Survey.
Katherine Laliotis, Jennifer A. Burt, Eric E. Mamajek, Zhexing Li, Volker Perdelwitz, Jinglin Zhao, R. Paul Butler, Bradford Holden, Lee Rosenthal, B. J. Fulton, Fabo Feng, Stephen R. Kane, Jeremy Bailey, Brad Carter, Jeffrey D. Crane, Elise Furlan, Crystal L. Gnilka, Steve B. Howell, Gregory Laughlin, Stephen A. Shectman, Johanna K. Teske, C. G. Tinney, Steven S. Vogt, Sharon Xuesong Wang, Robert A. Wittenmyer   +24 more
doaj   +1 more source

Analysis of Autoguiding for Exoplanet Transit Research at the UNH Observatory [PDF]

, 2019
This paper will discuss the proper calibration technique for an autoguider of a CCD camera and the results that follow from successful exoplanet transit observations.
Cappuccio, Anthony
core   +1 more source

Modeling Wind‐Driven Waves on Other Planets: Applications to Mars, Titan, and Exoplanets

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Waves could exist on any planet with sustained winds and stable surface liquids. However, differences in atmospheres, liquids, and gravity confound efforts to extend Earth‐based empirical wave models to other planetary environments. We adapted a physics‐based numerical wave model to study how planetary conditions affect the growth of waves. We
Una G. Schneck, Charlene E. Detelich, Milan Curcic, Andrew D. Ashton, Alexander G. Hayes, J. Taylor Perron   +5 more
wiley   +1 more source

SPIN–ORBIT ALIGNMENT OF EXOPLANET SYSTEMS: ENSEMBLE ANALYSIS USING ASTEROSEISMOLOGY [PDF]

The Astrophysical Journal, 2016
ABSTRACT The angle ψ between a planet’s orbital axis and the spin axis of its parent star is an important diagnostic of planet formation, migration, and tidal evolution. We seek empirical constraints on ψ by measuring the stellar inclination i s via asteroseismology for an ensemble of 25 solar-type hosts observed with ...
T. L. Campante, M. N. Lund, J. S. Kuszlewicz, G. R. Davies, W. J. Chaplin, S. Albrecht, J. N. Winn, T. R. Bedding, O. Benomar, D. Bossini, R. Handberg, A. R. G. Santos, V. Van Eylen, S. Basu, J. Christensen-Dalsgaard, Y. P. Elsworth, S. Hekker, T. Hirano, D. Huber, C. Karoff, H. Kjeldsen, M. S. Lundkvist, T. S. H. North, V. Silva Aguirre, D. Stello, T. R. White   +25 more
openaire   +6 more sources

A Population of Very-Hot Super-Earths in Multiple-Planet Systems Should be Uncovered by Kepler

, 2010
We simulate a Kepler-like observation of a theoretical exoplanet population and we show that the observed orbital period distribution of the Kepler giant planet candidates is best matched by an average stellar specific dissipation function Q_* in the ...
Batalha, Batalha, Borucki, Bryson, Caldwell, Dobbs-Dixon, Ford, Fortney, Gu, Haas, Ibgui, Ida, Ida, Ida, Jackson, Jackson, Jackson, Jenkins, Jenkins, Koch, Levrard, Mardling, Masset, Miller, Ogihara, Ogilvie, Ogilvie, Reid, Rocha-Pinto, Rocha-Pinto, Sandquist, Schlaufman, Schlaufman, Seager, Winn   +34 more
core   +1 more source

Searching for Rotational X‐Ray Modulation on TIC 277539431

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at 81°$$ {81}^{{}^{\circ}} $$. Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below 30°$$ {30}^{{}^{\circ}} $
Desmond Dsouza, Katja Poppenhäger, Ekaterina Ilin   +2 more
wiley   +1 more source

Surrounded by Giants: Habitable Zone Stability Within the HD 141399 System

The Astronomical Journal, 2023
The search for exoplanets has revealed a diversity of planetary system architectures, the vast majority of which diverge significantly from the template of the solar system.
Stephen R. Kane
doaj   +1 more source

Toward an initial mass function for giant planets

, 2017
The distribution of exoplanet masses is not primordial. After the initial stage of planet formation is complete, the gravitational interactions between planets can lead to the physical collision of two planets, or the ejection of one or more planets from
Carrera, Daniel, Davies, Melvyn B., Johansen, Anders   +2 more
core   +1 more source