Prépublication
· 2026 arXiv
EN
We report the discovery of PALTA-1 b, a sub-Jupiter mass exoplanet candidate orbiting the nearby early-L dwarf DENIS-P J1253108-570924 (DE1253-57) located at a distance of ~17 pc. The exoplanet was discovered by monitoring the L dwarf's astrometric motion with...
J. Sahlmann, P. F. Lazorenko et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
We report new ALMA Band 7 high-resolution ($\sim$0.05$^{''}$) continuum and $^{12}\text{CO}\ (J=3\text{--}2)$ observations of the disk around the young low-mass star Sz 76. Visibility-plane modeling reveals a previously undetected, faint outer dust ring center...
Giulia Ricciardi, Anna Miotello et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Ultracool dwarfs exhibit radio emission revealing strong magnetic fields and complex magnetospheric processes. Their auroral emission resembles that observed in magnetized Solar System planets, providing a framework to investigate their magnetic topology. We a...
D. Martín-Carrero, J. B. Climent et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Cosmic birefringence, the rotation of the polarization plane of CMB photons, provides an intriguing probe of physics beyond the Standard Model. In this paper, we investigate a vector Chern-Simons coupling between the neutrino current and photons as a possible...
Kentaro Kasai, Ippei Obata
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We present a low entry barrier numerical code LazyTB that solves the Einstein equations in the ADM-formulation for a general spherically symmetric problem with an arbitrary number of fluids with user defined equations of state and optional interactions between...
Kimmo Kainulainen, Enrico Schiappacasse et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Identifying the process relevant to planet formation is still a major task. Mechanisms have been identified that can trap dust, preventing it from migrating inwards. A particular hydrodynamic instability, known as the streaming instability, is of high interest...
Dominik Hetzel Ostertag, Mario Flock et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Studies with 1-m class telescopes have now established that glints from satellites and space debris are the main obstacles to searches for sub-minute optical transients. Here, we report a study of this foreground using observations from the Legacy Survey of Sp...
G. Megias Homar, S. R. Kulkarni et al.
#astro-ph.IM
Prépublication
· 2026 arXiv
EN
Cosmological first-order phase transitions can generate curvature perturbations through inhomogeneous quantum tunneling, as studied previously on superhorizon scales. In this work, we for the first time conduct three-dimensional lattice simulations that incorp...
Yuan-Jie Li, Jing Liu et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Constellation Monte Carlo results depend on the orbital population used to evaluate a tasking policy. With scarce reference trajectories, replay limits geometric diversity, while independent orbital-element jitter can violate physical constraints. We study con...
Omar Ramadan, Sam Siavoshian et al.
#astro-ph.IM
Prépublication
· 2026 arXiv
EN
Cosmological parameters can be estimated from dark sirens, gravitational waves events without electromagnetic counterpart, by using inference methods which estimate statistically the source redshift from galaxy catalogs. We study the effects of applying differ...
Juan Esteban Rivera, Antonio Enea Romano et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Near-ultraviolet (NUV) observations can uniquely probe low-density, high-altitude gas in ultra-hot Jupiters (UHJs) via strong resonance lines of metals. WASP-76b is a well-studied UHJ with prior detections of refractory metals and complex day-night chemistry,...
Lakeisha M. Ramos Rosado, Leonardo A. Dos Santos et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
The near-Earth asteroid (3200) Phaethon exhibits unusually high linear polarisation at large phase angles. Previous observations revealed a significant difference between apparitions: measurements obtained in 2016 showed a polarisation up to $\sim10$ percentag...
Zuri Gray, Mikko Vuori et al.
#astro-ph.EP