Prépublication
· 2026 arXiv
EN
The small satellites of dwarf-planet size worlds in trans-Neptunian space are thought to be produced through giant impacts, and are typically observed to have bright water-ice-dominated surfaces. Here we focus on Quaoar's small primary satellite, Weywot. We bu...
Cameron Collyer, Estela Fernandez-Valenzuela et al.
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
Stellar granulation imprints line-dependent wavelength shifts and profile variations that limit the precision of radial velocity (RV) measurements used for exoplanet detection and characterization. Understanding how the sensitivity of individual spectral lines...
Dušan Vukadinović, Sowmya Krishnamurthy et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Gravitational microlensing is a unique planet-detection method that does not rely on detecting light from the host star or planet. Instead, planets are discovered when their gravitational field perturbs the light coming from a distant source. The mechanics of...
Aikaterini Vandorou, Stela Ishitani Silva
#astro-ph.EP
Prépublication
· 2026 arXiv
EN
We study holographic dark energy models constructed from generalized entropy functionals and local infrared cut-offs. Three entropies (Barrow and the three and five-parameter generalized entropies) are each combined with the Granda-Oliveros (GO) cut-off and tw...
Ke Chen, Simone D'Onofrio et al.
#gr-qc
Prépublication
· 2026 arXiv
EN
METR's 50\% time horizon measures the human completion time of software tasks that an AI solves with 50\% probability, allowing AI capabilities to be expressed in interpretable units. On 228 tasks and 26 AIs, we recompute the time horizons using splines and it...
Drew T. Nguyen, William Fithian
#cs.AI
Prépublication
· 2026 arXiv
EN
In 2026, cybersecurity evaluations involving OpenAI, Anthropic, and Google agents reached real systems outside their authorized test scope. The paths were different. OpenAI agents exploited research infrastructure, coordinated across runs, and compromised part...
Abbas Raftari
#cs.CR
Prépublication
· 2026 arXiv
EN
Assessing compound weather risks requires forecasts representing dependence between variables. CLARA (Calibrated Advection-Routing Attention) learns joint Gaussian predictive distributions of five surface variables from station observations alone, without nume...
Chaeyeon Yi, Yun Am Seo
#stat.AP
Prépublication
· 2026 arXiv
EN
Accurate precipitation estimation at fine spatial scales is critical for hydrology, agriculture, and climate studies. Infrared brightness temperatures from geostationary satellites offer excellent temporal coverage over continental-scale domains. However, beca...
Matthieu Meignin, Cécile Mallet et al.
#physics.ao-ph
Prépublication
· 2026 arXiv
EN
Deep learning has made rapid advances in weather forecasting: autoregressive models trained on atmospheric reanalyses now rival dynamical models across nowcasting, medium-range, and subseasonal-to-seasonal lead times, producing well-calibrated ensemble forecas...
Tom Beucler, J. David Neelin et al.
#physics.ao-ph
Prépublication
· 2026 arXiv
EN
We introduce EC-EarthFlow, a generative flow matching model that emulates simulations from the physical climate model EC-Earth3. The model is trained on transient simulations from EC-Earth3 (1950-2166, SSP2-4.5) to predict the day ahead temperature field from...
Kirien Whan, Nikolaj T. Mücke et al.
#cs.LG
Prépublication
· 2026 arXiv
EN
The Global Ocean Observing System is key to understanding oceanic variability and climate change. The ocean is vast and often sparsely and irregularly sampled in time and space by various instruments and systems. Statistical models, especially spatio-temporal...
Mikael Kuusela, Sofia C. Olhede et al.
#stat.AP
Prépublication
· 2026 arXiv
EN
Atmospheric warming raises evaporative demand, but actual evapotranspiration (ETa) may track demand or decouple under water limitation. Here, we quantified demand-tracking ability from regression slopes relating deseasonalized ETa and reference evapotranspirat...
Yan Zhang, Veronica J. Berrocal et al.
#physics.ao-ph