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astro-ph.EP2026

Probing Exoplanetary Chemistry with Ariel: Scientific Priorities and Observational Strategies

Olivia Venot, Yamila Miguel, Robin Baeyens +30

Over the past two decades, increasingly precise observations have revealed that exoplanet atmospheres are chemically diverse and often far from equilibrium, with processes such as…

astro-ph.EP2026

Gravitational instability in planet-forming discs

Cristiano Longarini, Giuseppe Lodato

During the earliest phases of star and planet formation, a young star is surrounded by a disc that can become gravitationally unstable. Indeed, if the protoplanetary disc is suffic…

astro-ph.EP2026

Dust trapping, collisional velocity and velocity dispersion in gravito-turbulent discs

Cristiano Longarini, Cathie J. Clarke, Richard A. Booth +1

High-resolution ALMA observations indicate that planet formation is already well underway in the earliest stages of disc evolution, when discs are typically massive enough to be re…

astro-ph.EP2026

Tidal Rock Grinding as a Source of H2 on Enceladus

Karin I. Oberg, Cara Magnabosco, Nicholas J. Tosca

The Solar System hosts multiple potentially habitable environments, including the subsurface ocean beneath the icy crust of Saturn's moon Enceladus. This ocean's composition is unu…

astro-ph.EP2026

-mapping of planet-induced density wave damping in protoplanetary discs

Amelia J. Cordwell, Roman R. Rafikov

Planets embedded in protoplanetary discs are capable of creating a wide variety of substructures through gravitational interactions. This process is mediated through the excitation…

astro-ph.EP2026

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) XI: Gas-dust interactions and radial offsets between micron and millimetre-sized grains

J. Olofsson, M. R. Jankovic, S. Marino +22

The dust observed in debris disks is the result of a collisional cascade initiated from km-sized parent bodies. Using near-infrared to sub-millimeter observations, we can pr…

astro-ph.EP2026

Equifinality of Venus-like CO Atmospheres

Tereza Constantinou, Oliver Shorttle, Harrison Nicholls

While Earth locks much of its carbon in its crust as carbonates, Venus retains a comparable carbon inventory almost entirely in its atmosphere as CO. On Earth, the geological c…

astro-ph.EP2026★ 1 cited

The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations

A. Bonfanti, D. Gandolfi, P. Leonardi +96

Following the 2022 alert of a TESS object of interest transiting TOI-5624 (a G7 V star 100 pc away), a CHEOPS campaign in 2023 detected four planetary signals at $P_b\approx3…

astro-ph.EP2026★ 1 cited

Large Dust Grains and a Possible Dust Trap in the Polar Circumbinary Disc of HD 98800B

Álvaro Ribas, Thomas Lack, Francesco Zagaria +6

HD 98800 is a nearby hierarchical quadruple system comprising two binaries orbiting each other. Surprisingly, despite its 10 Myr age and dynamic environment, the Ba-Bb compo…

astro-ph.EP2026

The efficient delivery of highly-siderophile elements to the core creates a mass accretion catastrophe for the Earth

Richard J. Anslow, Maylis Landeau, Amy Bonsor +2

The excess abundance of highly siderophile elements (HSEs), as inferred for the terrestrial planets and the Moon, is thought to record a `late veneer' of impacts after the giant im…

astro-ph.EP2026★ 1 cited

exoALMA XX: Tomographic Detection of Embedded Planets in Protoplanetary Disks

Andres F. Izquierdo, Jaehan Bae, Stefano Facchini +32

The exoALMA Large Program has revealed a wealth of substructures in the dust and molecular line emission of several protoplanetary discs, suggesting that planet formation may unfol…

astro-ph.EP2026★ 1 cited

exoALMA XXIII. Estimating Disk and Planet Properties from Dust Morphologies with DBNets2.0

Alessandro Ruzza, Giuseppe Lodato, Giovanni Rosotti +21

The exoALMA large program provided an unprecedented view of the morphology and kinematics of 15 circumstellar disks, offering a biased but homogenous and well-characterized sample…

astro-ph.EP2026★ 3 cited

exoALMA XXI: The Morphology and Dynamics of Vertical Flows

Myriam Benisty, Andres F. Izquierdo, Jochen Stadler +33

Vertical gas flows, such as winds and meridional circulations, are natural outcomes of protoplanetary disk processes and play a critical role in the earliest stages of planet forma…

astro-ph.EP2026★ 2 cited

Ground-based Atmospheric Characterization of Super-Earth L 98-59 d at High Spectral Resolution

Connor J. Cheverall, Nikku Madhusudhan, Savvas Constantinou +1

Atmospheric characterization of exoplanets using ground-based high-resolution transmission spectroscopy has traditionally focussed on large and close-in planets, such as hot Jupite…

astro-ph.EP2026

Hydrocarbon complexity and photochemical shielding of prebiotic feedstock molecules in exoplanet atmospheres

Marrick Braam, Ellery Gopaoco, Shang-Min Tsai +4

The potential of prebiotic chemistry to propagate on an exoplanet fundamentally depends on whether the atmospheric conditions can facilitate the production of prebiotic feedstock m…

astro-ph.EP2026

Sometimes You Just Can't Put a Ring on It: Setting Constraints on Rings around Moons from Magnetic Fields

Jamie M. Erak, Mor Rozner

All four giant planets and several minor bodies in the Solar System host rings. However, rings around moons have yet to be observed. A host planet can produce magnetic fields that…

astro-ph.EP2026

Organosulfur Chemistry on sub-Neptunes: Implications for hazes and biosignatures

Sean Jordan, Shang-Min Tsai, Paul B. Rimmer +1

The organosulfur biosignature gases dimethylsulfide (DMS) and dimethlydisulfide (DMDS) have recently been claimed to be present in the atmosphere of sub-Neptune exoplanet K2-18b, l…

astro-ph.EP2026★ 1 cited

Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903

Thomas G. Wilson, Anna M. Simpson, Andrew Collier Cameron +173

Small exoplanet radii show two populations, referred to as super-Earths and sub-Neptunes, separated by a gap known as the radius valley. This may be produced by the removal of atmo…

astro-ph.EP2026★ 2 cited

Global magnetohydrodynamic simulations of the inner regions of protoplanetary discs. II. Vertical-net-flux regime

Matthew J. O. Roberts, Henrik N. Latter, Geoffroy Lesur

The inner regions of protoplanetary discs, which encompass the putative habitable zone, are dynamically complex, featuring a relatively well-ionised, turbulent active zone located…

astro-ph.EP2026★ 18 cited

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) II. The radial structure of debris discs

Yinuo Han, Elias Mansell, Jeff Jennings +38

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) was recently completed to cover the lack of high-resolution observations of debris discs and to investigate the preva…

astro-ph.EP2026★ 10 cited

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) V: Comparison between scattered light and thermal emission

J. Milli, J. Olofsson, M. Bonduelle +33

Debris discs are analogues to our own Kuiper belt around main-sequence stars and are therefore referred to as exoKuiper belts. They have been resolved at high angular resolution at…

astro-ph.EP2026★ 8 cited

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) III: The vertical structure of debris disks

Brianna Zawadzki, Anna Fehr, A. Meredith Hughes +37

Debris disks -- collisionally sustained belts of dust and sometimes gas around main sequence stars -- are remnants of planet formation processes and are found in systems ${\gtrsim}…

astro-ph.EP2026★ 4 cited

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) VII: Optically thick gas with broad CO gaussian local line profiles in the HD 121617 disc

A. Brennan, L. Matrà, S. Mac Manamon +24

CO gas has been detected in 20 debris discs. We present ALMA observations of the CO-rich HD 121617 debris disc from the ARKS survey. Using high-resolution Band 7 observations…

astro-ph.EP2026★ 11 cited

The ALMA survey to Resolve exoKuiper belt Substructures (ARKS): VI. Asymmetries and offsets

J. B. Lovell, A. S. Hales, G. M. Kennedy +33

Asymmetries in debris discs provide unique clues to understand the evolution and architecture of planetary systems.** The aim of the ALMA survey to Resolve exoKuiper belt Substruct…