Results 71 to 80 of about 134,248 (173)

Tidal Dissipation in Stably Stratified and Semiconvective Regions of Rotating Giant Planets: Incorporating Coriolis Forces

The Astrophysical Journal, 2023
We study how stably stratified or semiconvective layers alter tidal dissipation rates associated with the generation of inertial, gravito-inertial, interfacial, and surface gravity waves in rotating giant planets.
Christina M. Pontin, Adrian J. Barker, Rainer Hollerbach   +2 more
doaj   +1 more source

An Empirical Predictive Model for Atmospheric H Lyman‐α Emission Brightness at Mars

Earth and Space Science, Volume 11, Issue 6, June 2024.
Abstract Characterizing the abundance of atmospheric hydrogen (H) at Mars is critical for determining the current and, subsequently, the primordial water content on the planet. At present, the atmospheric abundance of Martian H is not directly measured but is simulated using proprietary models that are constrained with observations of H Lyman‐α ...
Majd Mayyasi, Adil Mayyasi
wiley   +1 more source

Tides Tighten the Hycean Habitable Zone

The Astrophysical Journal Letters
Hycean planets—exoplanets with substantial water ice layers, deep surface oceans, and hydrogen-rich atmospheres—are thought to be favorable environments for life. Due to a relative paucity of atmospheric greenhouse gases, hycean planets have been thought
Joseph R. Livesey, Juliette Becker, Susanna L. Widicus Weaver   +2 more
doaj   +1 more source

A Verification Suite of Test Cases for the Barotropic Solver of Ocean Models

Journal of Advances in Modeling Earth Systems, Volume 16, Issue 4, April 2024.
Abstract The development of any atmosphere or ocean model warrants a suite of test cases (TCs) to verify its spatial and temporal discretizations, order of accuracy, stability, reproducibility, portability, scalability, etc. In this paper, we present a suite of shallow water TCs designed to verify the barotropic solver of atmosphere and ocean models ...
Siddhartha Bishnu, Mark R. Petersen, Bryan Quaife, Joseph Schoonover   +3 more
wiley   +1 more source

Exomoon Phase Curves: Toroidal Exosphere Simulations of Exo‐Ios Orbiting 8 Exoplanets in Alkali Spectroscopy

Journal of Geophysical Research: Planets, Volume 129, Issue 3, March 2024.
Abstract Toroidal atmospheres and exospheres characterized at exoplanets may be fueled by volcanically active exomoons, often referred to as exo‐Ios. We study the neutral outgassing and volatile evolution of a close‐orbiting, evaporating satellite at eight candidate exoplanet‐exomoon systems WASP‐49,‐96,‐69,‐17 b, XO‐2N b, HAT‐P‐1 b, HD‐189733 b, and ...
M. Meyer zu Westram, A. V. Oza, A. Galli
wiley   +1 more source

Long‐Term Variability of Mean Winds and Planetary‐Scale Waves Around Venusian Cloud Top Observed With Akatsuki/UVI

Journal of Geophysical Research: Planets, Volume 129, Issue 3, March 2024.
Abstract Since December 2015, Ultraviolet Imager (UVI) onboard Akatsuki has been observing Venus clouds at the wavelengths of 283 and 365 nm. Horizontal winds near the cloud top derived from the UVI images over ∼7 earth years are analyzed to elucidate spatial and temporal variability of the superrotation and planetary‐scale waves.
Takeshi Horinouchi, Toru Kouyama, Masataka Imai, Shin‐ya Murakami, Yeon Joo Lee, Atsushi Yamazaki, Manabu Yamada, Shigeto Watanabe, Takeshi Imamura, Javier Peralta, Takehiko Satoh   +10 more
wiley   +1 more source

Quiet Time Thermospheric Gravity Waves Observed by GOCE and CHAMP

Journal of Geophysical Research: Space Physics, Volume 129, Issue 1, January 2024.
Abstract The Gravity Field and Steady‐State Ocean Circulation Explorer (GOCE) and CHAllenging Minisatellite Payload (CHAMP) satellites measure in‐situ thermospheric density and cross‐track wind. When propagating obliquely to the satellite track in a horizontal plane (i.e., not purely along‐track or cross‐track), gravity waves (GWs) can be observed both
Shuang Xu, Sharon L. Vadas, Jia Yue
wiley   +1 more source

A Short History of (Orbital) Decay: Roman’s Prospects for Detecting Dying Planets

The Astronomical Journal
The Roman Space Telescope Galactic Bulge Time Domain Survey (GBTDS) is expected to detect ∼10 ^5 transiting planets. Many of these planets will have short orbital periods and are thus susceptible to tidal decay.
Kylee Carden, B. Scott Gaudi, Robert F. Wilson   +2 more
doaj   +1 more source

Numerical Nonadiabatic Tidal Calculations with GYRE-tides: The WASP-12 Test Case

The Astrophysical Journal Letters
We revisit the tidal evolution of the WASP-12 system using direct numerical calculations with the GYRE-tides code. WASP-12b is a hot Jupiter on a 1.1 day orbit around a slightly evolved F-type star. Its observed orbital decay rate, $| {\dot{P}}_{{\rm{orb}
Meng Sun, R. H. D. Townsend, Hongbo Xia, Jifeng Liu   +3 more
doaj   +1 more source

Potential Interior Structures and Habitability of Super-Earth Exoplanets LHS 1140 b, K2-18 b, TOI-1452 b, and TOI-1468 c

The Astrophysical Journal
We analyze four super-Earth exoplanets, LHS 1140 b, K2-18 b, TOI-1452 b, and TOI-1468 c, which orbit M dwarf stars in the habitable zone. Their relative proximity, within 40 pc, makes them prime candidates for follow-up observations and atmospheric and ...
Mangesh Daspute, Amri Wandel, Ravi Kumar Kopparapu, Volker Perdelwitz, Jerusalem Tamirat Teklu, Lev Tal-Or   +5 more
doaj   +1 more source