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astro-ph.EP2026

Spin-Orbit Geometry of AU Mic b and c from Back-to-Back Transits Observed Contemporaneously with Magellan PFS, LCOGT, and CHEOPS

Zitao Lin, Gyula M. Szabó, Krzysztof Sz. Zieliński +37

Young planets offer a unique window into the early stages of planetary evolution. AU Mic is one of the nearest (9.8 pc) pre-main sequence stars (~20 Myr), hosting two transiting Ne…

astro-ph.EP2026

Reassessing planetary composition: Evidence of rock-dominated envelopes in Uranus and Neptune

Vanesa Ramirez, Yamila Miguel, Saburo Howard

Although Uranus and Neptune are commonly classified as ice giants, their exact compositions remain poorly constrained. Recent studies of outer Solar System bodies challenge the tra…

astro-ph.EP2026

RedDots: Multiplanet system around M dwarf GJ 887 in the solar neighborhood

C. Hartogh, S. V. Jeffers, S. Dreizler +7

GJ 887 is a bright M dwarf in the solar neighborhood with two currently reported nontransiting exoplanets with periods of and along with an addition…

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

Revisiting the exoplanet radius valley with host stars from SWEET-Cat

Juma Kamulali, Vardan Adibekyan, Benard Nsamba +7

The radius valley,a deficit of planets near 2 , was observed among exoplanets of radius 5 with periods 100 days by NASA's…

astro-ph.EP2026★ 1 cited

Constraining the size, shape, and albedo of the large Trans-Neptunian Object (28978) Ixion with multi-chord stellar occultations

Y. Kilic, F. Braga-Ribas, C. L. Pereira +81

Trans-Neptunian objects (TNOs) are among the most primitive remnants of the early Solar System, and constraining their sizes, shapes, albedos, and surface properties is essential f…

astro-ph.EP2025★ 8 cited

Characterization of debris disks observed with SPHERE

N. Engler, J. Milli, N. Pawellek +33

This study aims to characterize debris disks observed with SPHERE across multiple programs, with the goal of identifying systematic trends in disk morphology, dust mass, and grain…

astro-ph.EP2025★ 5 cited

Tighter constraints on the atmosphere of GJ 436 b from combined high-resolution CARMENES and CRIRES observations

A. Peláez-Torres, A. Sánchez-López, L. Nortmann +23

We aim to study the atmospheric properties of the warm Neptune GJ 436 b by combining a set of five transit events observed with the CARMENES spectrograph with one transit from CRIR…

astro-ph.EP2025

Stellar chemistry and planet size: insights from GALAH DR4

N. Sussholz, S. Zucker, R. Helled +1

The well-known correlation between stellar metallicity and planet occurrence is strongest for giant planets, but weaker for smaller planets, suggesting that detailed elemental patt…

astro-ph.EP2025★ 8 cited

Exomoon search with VLTI/GRAVITY around the substellar companion HD 206893 B

Q. Kral, J. Wang, J. Kammerer +130

Direct astrometric detection of exomoons remains unexplored. This study presents the first application of high-precision astrometry to search for exomoons around substellar compani…

astro-ph.EP2025★ 3 cited

Upper limits on atmospheric abundances of KELT-11b and WASP-69b from a retrieval approach

F. Lesjak, L. Nortmann, D. Cont +18

WASP-69b and KELT-11b are two low-density hot Jupiters, which are expected to show strong atmospheric features in their transmission spectra. Such features offer valuable insights…

astro-ph.EP2025★ 6 cited

The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions

J. Kammerer, T. O. Winterhalder, S. Lacour +106

Direct observations of exoplanet and brown dwarf companions with near-infrared interferometry, first enabled by the dual-field mode of VLTI/GRAVITY, provide unique measurements of…

astro-ph.EP2025★ 2 cited

How Internal Structure Shapes the Metallicity of Giant Exoplanets

Lorenzo Peerani, Saburo Howard, Ravit Helled

The composition and internal structure of gas giant exoplanets encode key information about their formation and evolution. We investigate how different assumed interior structures…

astro-ph.EP2025

A planetary system with a sub-Neptune planet in the habitable zone of TOI-2093

J. Sanz-Forcada, E. González-Álvarez, M. R. Zapatero Osorio +33

Aims. We aim to confirm and measure the mass of the transiting planet candidate around the K5V star TOI-2093, previously announced by the Transiting Exoplanet Survey Satellite (TES…

astro-ph.EP2025

A high geometric albedo and small size of the Haumea cluster member (24835) 1995 SM55 from a stellar occultation and photometric observations

J. L. Ortiz, N. Morales, B. Sicardy +98

Trans-Neptunian objects (TNOs) are among the most ancient bodies of the solar system. Understanding their physical properties is key to constraining their origin and the evolution…

astro-ph.EP2025

Probing the extent of WASP-52 b's atmosphere. High-resolution observations and 3D modeling insights

F. Nail, A. Oklopčić, M. MacLeod +5

WASP-52 b is an inflated hot Jupiter with a large Roche lobe filling fraction, positioned in the hot Neptune desert. Previous in-transit observations of the helium triplet at 10833…

astro-ph.EP2025★ 10 cited

The Possibility of Hydrogen-Water Demixing in Uranus, Neptune, K2-18b and TOI-270d

Saburo Howard, Ravit Helled, Armin Bergermann +1

The internal structures of Uranus and Neptune remain unknown. In addition, sub-Neptunes are now thought to be the most common type of exoplanets. Understanding the physical process…

astro-ph.EP2025★ 27 cited

Connection between planetary He I 10830 Å absorption and extreme-ultraviolet emission of planet-host stars

J. Sanz-Forcada, M. López-Puertas, M. Lampón +13

Context. The detection of the He I 10830 A triplet in exoplanet atmospheres has opened a new window for probing planetary properties, including atmospheric escape. Unlike Lyman alp…

astro-ph.EP2024★ 16 cited

Combining Gaia and GRAVITY: Characterising five new Directly Detected Substellar Companions

T. O. Winterhalder, S. Lacour, A. Mérand +96

Precise mass constraints are vital for the characterisation of brown dwarfs and exoplanets. Here we present how the combination of data obtained by Gaia and GRAVITY can help enlarg…

astro-ph.EP2023★ 15 cited

Euclid: Identification of asteroid streaks in simulated images using deep learning

M. Pöntinen, M. Granvik, A. A. Nucita +114

Up to 150000 asteroids will be visible in the images of the ESA Euclid space telescope, and the instruments of Euclid offer multiband visual to near-infrared photometry and slitles…

astro-ph.EP2023★ 7 cited

Presence of liquid water during the evolution of exomoons orbiting ejected free-floating planets

Giulia Roccetti, Tommaso Grassi, Barbara Ercolano +4

Free-floating planets (FFPs) can result from dynamical scattering processes happening in the first few million years of a planetary system's life. Several models predict the possib…

astro-ph.EP2022★ 9 cited

Gravito-turbulence in local disk simulations with an adaptive moving mesh

Oliver Zier, Volker Springel

Self-gravity plays an important role in the evolution of rotationally supported systems such as protoplanetary disks, accretion disks around black holes, or galactic disks, as it c…

astro-ph.EP2022★ 6 cited

Population Study of Astrophysical False Positive Detections in the Southern PLATO field

J. C. Bray, U. Kolb, P. Rowden +3

For the upcoming PLAnetary Transits and Oscillation of stars (PLATO) satellite mission, a large number of target stars are required to yield a statistically significant number of p…

astro-ph.EP2022★ 4 cited

Detecting HO with CRIRES+: the case of WASP-20b

M. C. Maimone, M. Brogi, A. Chiavassa +5

Infrared spectroscopy over a wide spectral range and at the highest resolving powers (R>70 000) has proved to be one of the leading technique to unveil the atmospheric composition…