Results 91 to 100 of about 137,337 (258)

The Demographics of Terrestrial Planets in the Venus Zone

The Astronomical Journal, 2023
Understanding the physical characteristics of Venus, including its atmosphere, interior, and its evolutionary pathway with respect to Earth, remains a vital component for terrestrial planet evolution models and the emergence and/or decline of planetary ...
Colby Ostberg, Stephen R. Kane, Zhexing Li, Edward W. Schwieterman, Michelle L. Hill, Kimberly Bott, Paul A. Dalba, Tara Fetherolf, James W. Head, Cayman T. Unterborn   +9 more
doaj   +1 more source

Long‐Lasting Volcanism of the Moon Aided by the Switch in Dominant Mechanisms of Magma Ascent: Role of Localized Radioactive Enrichment in a Numerical Model of Magmatism and Mantle Convection

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Significant volcanic activity continued for billions of years since 3.5–4 Gyr ago in the Procellarum KREEP Terrane (PKT) of the Moon, but not so significant outside the PKT. To understand this volcanic history, we developed a 2‐D numerical model of magmatism and mantle convection; the effects of the PKT on lunar evolution are considered by ...
Ken'yo U, Masanori Kameyama, Gaku Nishiyama, Takehiro Miyagoshi, Masaki Ogawa   +4 more
wiley   +1 more source

Tracing the Contribution of Abiotic Methane in Deep Natural Gases From the Songliao Basin, China Using Bulk Isotopes and Methane Clumped Isotopologue 12CH2D2

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The identification and evaluation of abiotic methane remain an active research area due to uncertainties in traditional indicators that may lead to “false‐positive” detections. As an emerging isotopic tool, methane clumped isotope can provide novel information about the generation and post‐generation processes of methane gases.
Jiacheng Li, Qingmei Liu, Wenmin Jiang, Yun Li, Yanhua Shuai, Yongqiang Xiong   +5 more
wiley   +1 more source

TESS Discovery of a Transiting Super-Earth in the $\pi$ Mensae System

, 2018
We report the detection of a transiting planet around $\pi$ Mensae (HD 39091), using data from the Transiting Exoplanet Survey Satellite (TESS). The solar-type host star is unusually bright (V=5.7) and was already known to host a Jovian planet on a ...
Bouchy, Francois, Buchhave, Lars A., Burt, Jennifer, Caldwell, Douglas A., Charbonneau, David, Christensen-Dalsgaard, Jørgen, Christiansen, Jessie, Ciardi, David R., Collins, Karen A., Deming, Drake, Dittmann, Jason A., Dragomir, Diana, Ehrenreich, David, Fausnaugh, Michael, Glidden, Ana, Guerrero, Natalia, Günther, Maximilian N., Haworth, Kari, Huang, Chelsea X., Jenkins, Jon M., Kane, Stephen R., Latham, David W., Levine, Alan M., Lovis, Christophe, Marmier, Maxime, Mayor, Michel, McCullough, P. R., Morgan, Edward H., Morton, Tim, Narita, Norio, Nguyen, Tam, Pepe, Francesco, Pepper, Joshua, Pál, András, Quinn, Samuel N., Ricker, George R., Rodriguez, Joseph E., Seager, Sara, Sha, Lizhou, Shporer, Avi, Smith, Jeffrey C., Stassun, Keivan G., Ségransan, Damien, Udry, Stéphane, Vanderburg, Andrew, Vanderspek, Roland K., Winn, Joshua N., Wittenmyer, Rob, Wohler, Bill, Yu, Liang   +49 more
core   +1 more source

A study on unveiling the secrets of exoplanet hunting

International journal of research in engineering and innovation
Exoplanets are celestial bodies outside our solar system, orbiting stars other than our sun. They come in various sizes, compositions, and distances from their host stars.
Preeti Kalra, Abhendra PratapSingh, Arushi Gupt, Kartik Gupta, Prachi Jindal   +4 more
semanticscholar   +1 more source

Thermophysical States of MgSiO3 Liquid up to Terapascal Pressures: Implications for Magma Oceans in Super‐Earths and Sub‐Neptunes

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract Thermophysical properties of silicate liquids under extreme conditions are critical for understanding the accretion and evolution of super‐Earths and sub‐Neptunes. The thermal equation of state and viscosity of silicate liquids determine the adiabatic profiles and dynamics of magma oceans. However, these properties are challenging to constrain
Haiyang Luo, Jie Deng
wiley   +1 more source

Radial Velocities as an Exoplanet Discovery Method

, 2017
The precise radial velocity technique is a cornerstone of exoplanetary astronomy. Astronomers measure Doppler shifts in the star's spectral features, which track the line-of/sight gravitational accelerations of a star caused by the planets orbiting it ...
B Campbell, C Chubak, D Queloz, D Queloz, DA Fischer, DW Latham, FA Pepe, GW Marcy, H Kjeldsen, I Boisse, JF Kasting, JL Bean, JT Wright, M Mayor, RP Butler, RP Butler, WJ Borucki, X Dumusque   +17 more
core   +1 more source

Amplifying Resonant Repulsion with Inflated Young Planets, Overlooked Inner Planets, and Nonzero Initial Δ

The Astrophysical Journal
Most multiplanet systems around mature (∼5 Gyr old) host stars are nonresonant. Even the near-resonant planet pairs still display 1%–2% positive deviation from perfect period commensurabilities (Δ) near first-order mean motion resonances (MMRs). Resonant
Yuancheng Xu, Fei Dai
doaj   +1 more source

MESSENGER Observations of a Possible Alfvén Wing at Mercury Driven by a Low Alfvénic Mach Number Interplanetary Coronal Mass Ejection

Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.
Abstract We investigate Mercury's response to rare, low Alfvénic Mach number MA $\left({M}_{A}\right)$ solar wind conditions using observations from the Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) mission. This study provides compelling evidence of Mercury's altered magnetospheric state under these extreme conditions ...
Charles F. Bowers, Caitríona M. Jackman, Xianzhe Jia, James A. Slavin, Joachim Saur, Mika K. G. Holmberg, Ryan M. Dewey, Daniel Heyner, Filip Elekes, Lina Z. Hadid, Benoit Lavraud, Yang Wang, Hans L. F. Huybrighs, Matthew J. Rutala, Alexandra R. Fogg, Stephenie Brophy Lee, Daragh M. Hollman   +16 more
wiley   +1 more source

Kepler Observations of the Three Pre-Launch Exoplanet Candidates: Discover of Two Eclipsing Binaries and a New Exoplanet [PDF]

, 2010
Three transiting exoplanet candidate stars were discovered in a ground-based photometric survey prior to the launch of NASA's Kepler mission. Kepler observations of them were obtained during Quarter 1 of the Kepler mission.
Bryson, Stephen T., Ciardi, David R., Feldmeier, John J., Horch, Elliott, Howell, Steve B., Rowe, Jason F., Sherry, William, van Belle, Gerard T., von Braun, Kaspar   +8 more
core