Results 61 to 70 of about 1,144 (201)

TOI-1695 b: A Water World Orbiting an Early-M Dwarf in the Planet Radius Valley

open access: yesThe Astronomical Journal, 2023
Characterizing the bulk compositions of transiting exoplanets within the M dwarf radius valley offers a unique means to establish whether the radius valley emerges from an atmospheric mass-loss process or is imprinted by planet formation itself.
Collin Cherubim   +41 more
doaj   +1 more source

Cation Disorder of Mg2SiO4 ${\text{Mg}}_{\mathbf{2}}{\text{SiO}}_{\mathbf{4}}$ in Super‐Earth Mantles

open access: yesGeophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Understanding the mineralogy of exoplanets is essential for unraveling their interior structures, dynamics, and evolution. For large super‐Earths, the post‐post spinel Mg2SiO4 ${\text{Mg}}_{2}{\text{SiO}}_{4}$, one of the major mantle phases, may undergo the order‐disorder transition (ODT) at high temperatures.
Donghao Zheng   +5 more
wiley   +1 more source

The Formation of Ultra-short-period Planets under the Influence of the Nearby Planetary Companions

open access: yesThe Astrophysical Journal
Ultra-short-period (USP) planets, defined as those with orbital periods shorter than 1 day, provide valuable insights into planetary evolution under strong stellar tidal interactions.
Jiajun Zhu   +3 more
doaj   +1 more source

Altitude Profile and Isotopic Composition for N2 From Pioneer Venus Mass Spectra

open access: yesGeophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract We report the highest resolution altitude profile and isotopic composition for N2 at Venus, to date. These results were obtained through re‐analysis of data acquired by the Pioneer Venus Large Probe Neutral Mass Spectrometer (LNMS). The N2 is non‐uniformly mixed across the clouds and sub‐cloud atmosphere (∼59–15 km) yet uniformly mixed across ...
R. Mogul, S. S. Limaye, M. J. Way
wiley   +1 more source

Exoplanet Occurrence Rate with Age for FGK Stars in Kepler

open access: yesThe Astronomical Journal
We measure the exoplanet occurrence rate as a function of isochrone and gyrochronology ages using confirmed and candidate planets identified in Q1–17 DR25 Kepler data. We employ Kepler's pipeline detection efficiency to correct for the expected number of
Maryum Sayeed   +6 more
doaj   +1 more source

Stellar magnetic activity – Star-Planet Interactions

open access: yesEPJ Web of Conferences, 2015
Stellar magnetic activity is an important factor in the formation and evolution of exoplanets. Magnetic phenomena like stellar flares, coronal mass ejections, and high-energy emission affect the exoplanetary atmosphere and its mass loss over time.
Poppenhaeger, K.
doaj   +1 more source

Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution

open access: yesAGU Advances, Volume 6, Issue 6, December 2025.
Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer   +3 more
wiley   +1 more source

Metal-enriched Atmospheres in Warm (Super- and Sub-) Neptunes Induced by Extreme Atmospheric Escape

open access: yesThe Astrophysical Journal
Planet formation impacts exoplanet atmospheres by accreting metals in solid form, leading to atmospheric carbon-to-oxygen ratios (C/O) and sulfur-to-nitrogen ratios (S/N) that deviate from those of their host stars. Recent observations indicate differing
Amy J. Louca, Yamila Miguel
doaj   +1 more source

An analytical model for tidal evolution in co-orbital systems. I. Application to exoplanets [PDF]

open access: green, 2021
Jérémy Couturier   +2 more
openalex   +1 more source

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