Results 21 to 30 of about 757 (177)

THE INFLUENCE OF THE EXTREME ULTRAVIOLET SPECTRAL ENERGY DISTRIBUTION ON THE STRUCTURE AND COMPOSITION OF THE UPPER ATMOSPHERE OF EXOPLANETS [PDF]

The Astrophysical Journal, 2016
ABSTRACT By varying the profiles of stellar extreme ultraviolet (EUV) spectral energy distributions (SEDs), we tested the influences of stellar EUV SEDs on the physical and chemical properties of an escaping atmosphere. We apply our model to study four exoplanets: HD 189733b, HD 209458b, GJ 436b, and Kepler-11b.
Guo, J. H., Ben-Jaffel, Lotfi
openaire   +2 more sources

Outgassing Composition of the Murchison Meteorite: Implications for Volatile Depletion of Planetesimals and Interior-atmosphere Connections for Terrestrial Exoplanets

The Planetary Science Journal, 2023
Abstract Outgassing is a central process during the formation and evolution of terrestrial planets and their atmospheres both within and beyond the solar system. Although terrestrial planets’ early atmospheres likely form via outgassing during planetary accretion, the connection between a planet’s bulk composition and its
Maggie A. Thompson, Myriam Telus, Graham Harper Edwards, Laura Schaefer, Jasmeet Dhaliwal, Brian Dreyer, Jonathan J. Fortney, Kyle Kim   +7 more
openaire   +3 more sources

Atmospheric composition of exoplanets based on the thermal escape of gases and implications for habitability: Atmospheric composition of exoplanets

, 2020
The detection of habitable exoplanets is an exciting scientific and technical challenge. Owing to the current and most likely long-lasting impossibility of performing in situ exploration of exoplanets, their study and hypotheses regarding their capability to host life will be based on the restricted low-resolution spatial and spectral information of ...
Konatham, Samuel, Martín-Torres, F. J., Zorzano, María Paz   +2 more
openaire   +3 more sources

3D modelling of the impact of stellar activity on tidally locked terrestrial exoplanets: atmospheric composition and habitability

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT Stellar flares present challenges to the potential habitability of terrestrial planets orbiting M dwarf stars through inducing changes in the atmospheric composition and irradiating the planet’s surface in large amounts of ultraviolet light.
R J Ridgway, M Zamyatina, N J Mayne, J Manners, F H Lambert, M Braam, B Drummond, E Hébrard, P I Palmer, K Kohary   +9 more
openaire   +5 more sources

Modelling compositional convection for applications to exoplanet atmospheres

, 2023
Characterizing the climates of exoplanets— planets orbiting other stars —advances our knowledge of atmospheric science, planetary formation, internal structures and will eventually lead to the holy grail of exoplanet science, detecting biosignatures of alien life. This study focuses on atmospheric convection in super-Earth and sub-Neptune exoplanets, a
openaire   +1 more source

Correction to: 3D modelling of the impact of stellar activity on tidally locked terrestrial exoplanets: atmospheric composition and habitability

Monthly Notices of the Royal Astronomical Society, 2023
This is the final version. Available on open access from Oxford University Press via the DOI in this record ; The article for which this is the correction is available in ORE at http://hdl.handle.net/10871/131398 ; This is a correction to: R. J. Ridgway, M. Zamyatina, N. J. Mayne, J. Manners, F. H. Lambert, M. Braam, B. Drummond, E. Hébrard, P.
Ridgway, RJ, Zamyatina, M, Mayne, NJ, Manners, J, Lambert, FH, Braam, M, Drummond, B, Hebrar, E, Palmer, PI, Kohary, K   +9 more
openaire   +2 more sources

Visible Octave Frequency Combs in Silicon Nitride Nanophotonic Waveguides Driven by Ti:Sapphire Lasers

Laser &Photonics Reviews, EarlyView.
Chip‐based frequency combs are usually pumped from telecom wavelengths, far from the visible. This work instead pumps close to the visible with a Ti:sapphire laser ‐ the source behind the original optical frequency combs and now becoming chip‐integrable‐ and lets silicon‐nitride waveguides convert it into efficient, octave‐spanning visible‐to‐infrared ...
Abdullah Alabbadi, Ewan Allan, Hanna Ostapenko, Pablo Castro‐Marín, Derryck T. Reid, Pascal Del'Haye   +5 more
wiley   +1 more source

The atmospheres of rocky exoplanets

Astronomy & Astrophysics
Context. The crust composition of rocky exoplanets with substantial atmospheres cannot be observed directly. However, recent developments have enabled novel observations and characterisations of their atmospheres. Aims. We aim to establish a link between observable spectroscopic atmospheric features and the mineralogical crust composition of exoplanets.
O. Herbort, L. Sereinig
openaire   +2 more sources

Nitrogen as a Tracer of Giant Planet Formation. I. A Universal Deep Adiabatic Profile and Semianalytical Predictions of Disequilibrium Ammonia Abundances in Warm Exoplanetary Atmospheres

The Astrophysical Journal, 2023
A major motivation of spectroscopic observations of giant exoplanets is to unveil planet formation processes from atmospheric compositions. Several recent studies suggested that atmospheric nitrogen, like carbon and oxygen, can provide important ...
Kazumasa Ohno, Jonathan J. Fortney
doaj   +1 more source

The Effects of Non-ideal Mixing in Planetary Magma Oceans and Atmospheres

The Astrophysical Journal
Sub-Neptunes with hydrogen-rich envelopes are expected to sustain long-lived magma oceans that continuously exchange volatiles with their overlying atmospheres.
Aaron Werlen, Edward D. Young, Hilke E. Schlichting, Caroline Dorn, Anat Shahar   +4 more
doaj   +1 more source