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Prépublication · 2026 arXiv EN

Towards a coupled activity-fallback model for comets I) 67P/Churyumov-Gerasimenko's water activity from a microphysics model with dynamic dust-depth

We apply a two-layer thermophysical model, with water sublimating from below a dust-crust with dynamically varying depth, to simulate the water outgassing rate, dust-ejections, and non-gravitational forces and torques of comet 67P/Churyumov-Gerasimenko. The du...

Nicholas Attree, Yuri Skorov et al. #astro-ph.EP

Prépublication · 2026 arXiv EN

Combination of multi-observatory photometry to determine asteroid rotation periods

This study aims to determine asteroid rotation periods from sparse, unevenly sampled, multi-observatory photometry using the Lomb-Scargle (L-S) method. The photometric measurements of the asteroids are taken from the circulars of the Minor Planet Center (MPC)....

Kristers Nagainis, Ilgmars Eglitis #astro-ph.EP

Prépublication · 2026 arXiv EN

Detailed study of HD 219134: a benchmark K-dwarf with a compact planetary system

Space missions such as CoRoT, Kepler, and TESS have transformed asteroseismology and its synergies with exoplanet science. We revisit the nearby K-dwarf HD 219134 to investigate the tension between asteroseismic and interferometric radii, update its fundamenta...

Jérôme Bétrisey, Camilla Pezzotti et al. #astro-ph.EP

Prépublication · 2026 arXiv EN

Star Cluster Ecology VIII. -- Dynamically Forming S-Type and $α$Centauri-like Systems

Aims: To analyse the impact of dynamically formed binaries emerging naturally from various star cluster environments on already established planetary systems. Methods: Numerical simulations replicating the star-forming region NGC 1333 are conducted. We conside...

Erwan Hochart, Simon Portegies Zwart #astro-ph.EP

Prépublication · 2026 arXiv EN

A Relationship Between Fast Radio Burst Dispersion Measure and Host Galaxy Inclination

It is commonly thought that fast radio bursts (FRBs) trace star formation, and that they are produced by magnetars. Both hypotheses imply that their sources are hosted primarily (but not exclusively) in galactic disks. Although there is evidence in that direct...

Lachlan Marnoch, Stuart D. Ryder et al. #astro-ph.GA

Document numérisé · 1755 Gallica (BnF) FR

Géographie générale

Document numérisé par la Bibliothèque nationale de France, publié en 1755. Thème : géographie. Consultable en ligne sur Gallica.