Distinguishing Oceans of Water from Magma on Mini-Neptune K2-18b
The Astrophysical Journal LettersMildly irradiated mini-Neptunes have densities potentially consistent with them hosting substantial liquid-water oceans (“Hycean” planets). The presence of CO _2 and simultaneous absence of ammonia (NH _3 ) in their atmospheres has been proposed as a ...
Oliver Shorttle +4 more
doaj +1 more source
Confirmation of Fe i on MASCARA-5 b’s Dayside Observed With EXPRES
The Astronomical JournalMASCARA-5 b/TOI-1431 b is an ultra-hot Jupiter ( P _orb = 2.650237 ± 0.000003 dayd, T _eq = 2370 ± 70 K, M _p = 3.12 ± 0.18 M _Jup , R _p = 1.49 ± 0.05 R _Jup ) orbiting a bright Am star ( V = 8.0 mag).
James T. Sikora +7 more
doaj +1 more source
The Metallicity and Carbon-to-oxygen Ratio of the Ultrahot Jupiter WASP-76b from Gemini-S/IGRINS
The Astronomical JournalMeasurements of the carbon-to-oxygen (C/O) ratios of exoplanet atmospheres can reveal details about their formation and evolution. Recently, high-resolution cross-correlation analysis has emerged as a method of precisely constraining the C/O ratios of ...
Megan Weiner Mansfield +13 more
doaj +1 more source
Characterizing Exoplanetary Atmospheres: New Views on Exoplanet Composition and Chemistry
To appear in the proceedings of the Pontifical Academy of Science workshop on The James Webb Space Telescope: from first light to new worldviews, Vatican City, 27-29 February ...
openaire +2 more sources
KRONOS I: The 1–2.8 μm JWST Transmission Spectrum of the 23 Myr V1298 Tau c
The Astronomical JournalWhile recent JWST observations of mature super-Earths and sub-Neptunes have frequently revealed featureless transmission spectra, their inflated progenitors offer a unique window into understanding their primordial compositions.
Matthew M. Murphy +18 more
doaj +1 more source
Global Chemical Transport on Hot Jupiters: Insights from the 2D VULCAN Photochemical Model
The Astrophysical JournalThe atmospheric dynamics of tidally locked hot Jupiters is characterized by strong equatorial winds. Understanding the interaction between global circulation and chemistry is crucial in atmospheric studies and interpreting observations.
Shang-Min Tsai +9 more
doaj +1 more source
A Photochemical Phosphorus-Hydrogen-Oxygen Network for Hydrogen-dominated Exoplanet Atmospheres
The Astrophysical JournalDue to the detection of phosphine (PH _3 ) in the solar system gas giants Jupiter and Saturn, PH _3 has long been suggested to be detectable in exosolar substellar atmospheres too.
Elspeth K. H. Lee +5 more
doaj +1 more source
The Solubility of N2 in High-pressure Ice and Its Consequent Outgassing Limitations in Water Worlds
The Astrophysical JournalExoplanets with a few percent water mass fraction may host a high-pressure ice layer that separates the atmosphere from the interior. We investigate the role played by this layer in the transport of N _2 between the interior and the atmosphere.
Amit Levi +3 more
doaj +1 more source
The Astronomical JournalPandora is a SmallSat mission dedicated to understanding exoplanets and their host stars by disentangling the impact of stellar heterogeneity on exoplanet transmission spectra.
Yoav Rotman +24 more
doaj +1 more source
Polycyclic Aromatic Hydrocarbons as an Extraterrestrial Atmospheric Technosignature
The Planetary Science JournalPolycyclic aromatic hydrocarbons (PAHs) are prevalent in the Universe and interstellar medium but are primarily attributed to anthropogenic sources on Earth, such as fossil fuel combustion and firewood burning.
Dwaipayan Dubey +3 more
doaj +1 more source