A Neptune-mass exoplanet in close orbit around a very low-mass star challenges formation models
Science, 2023 Theories of planet formation predict that low-mass stars should rarely host exoplanets with masses exceeding that of Neptune. We used radial velocity observations to detect a Neptune-mass exoplanet orbiting LHS 3154, a star that is nine times less ...
G. Stefansson +29 more
semanticscholar +1 more source
Vanadium oxide and a sharp onset of cold-trapping on a giant exoplanet [PDF]
Nature, 2023 The abundance of refractory elements in giant planets can provide key insights into their formation histories^ 1 . Owing to the low temperatures of the Solar System giants, refractory elements condense below the cloud deck, limiting sensing capabilities ...
S. Pelletier +17 more
semanticscholar +1 more source
Collisional formation of massive exomoons of superterrestrial exoplanets [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT Exomoons orbiting terrestrial or superterrestrial exoplanets have not yet been discovered; their possible existence and properties are therefore still an unresolved question. Here, we explore the collisional formation of exomoons through giant planetary impacts. We make use of smooth particle hydrodynamical collision simulations
Christoph Burger +6 more
openaire +5 more sources
Identification of carbon dioxide in an exoplanet atmosphere [PDF]
Nature, 2022 Carbon dioxide (CO_2) is a key chemical species that is found in a wide range of planetary atmospheres. In the context of exoplanets, CO_2 is an indicator of the metal enrichment (that is, elements heavier than helium, also called ‘metallicity’)^ 1 – 3 ,
The Jwst Transiting Exoplanet Community Early Release Ahrer +363 more
semanticscholar +1 more source
Let’s Sweep: The Effect of Evolving J 2 on the Resonant Structure of a Three-planet System
The Astrophysical Journal, 2023 Short and ultrashort period planets are peculiar types of exoplanets with periods as short as a few days or less. Although it is challenging to detect them, already several have been observed, with many additional candidates.
Thea H. Faridani +3 more
doaj +1 more source
ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS). I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres [PDF]
Astronomical Journal, 2023 AF Lep A+b is a remarkable planetary system hosting a gas-giant planet that has the lowest dynamical mass among directly imaged exoplanets. We present an in-depth analysis of the atmospheric composition of the star and planet to probe the planet’s ...
Z. Zhang 张 +12 more
semanticscholar +1 more source
A Geologic Si‐O‐C Pathway to Incorporate Carbon in Silicates
Geophysical Monograph Series, Page 47-54., 2020 This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.
Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions
Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Alexandra Navrotsky +2 more
wiley +2 more sources
The Astronomical Journal, 2023 We investigate and compare the composition of M-dwarf planets in systems with only one known planet (“singles”) to those residing in multiplanet systems (“multis”) and the fundamental properties of their host stars.
Romy Rodríguez Martínez +6 more
doaj +1 more source
Exoplanet interior retrievals: core masses and metallicities from atmospheric abundances [PDF]
Monthly notices of the Royal Astronomical Society, 2023 The mass and distribution of metals in the interiors of exoplanets are essential for constraining their formation and evolution processes. Never the less, with only masses and radii measured, the determination of exoplanet interior structures is ...
Sanne Bloot +3 more
semanticscholar +1 more source
Interpreting the Atmospheric Composition of Exoplanets: Sensitivity to Planet Formation Assumptions [PDF]
The Astrophysical Journal, 2022 Abstract Constraining planet formation based on the atmospheric composition of exoplanets is a fundamental goal of the exoplanet community. Existing studies commonly try to constrain atmospheric abundances, or to analyze what abundance patterns a given description of planet formation predicts.
Paul Mollière +15 more
openaire +6 more sources