Prépublication
· 2026 arXiv
EN
Solar energetic particle (SEP) events threaten space infrastructure, yet physics-based prediction models depend on numerous poorly constrained free parameters. We introduce the Fujitsu Solar Energetic particle Intelligent Tuning and Evaluation Network (SEITEN)...
Hiroyuki Tako Ishikawa, Naho Fujita et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Age is the one of the most difficult stellar properties to constrain. However, upcoming surveys such as PLATO are about to revolutionize our ability to measure FGK dwarf ages with asteroseismology. Here, we use The Cannon to construct a data-driven model for i...
Christopher Lam, Aida Behmard et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Massive protostellar disks are expected to sustain high accretion rates through gravitational instability, while dust growth may modify their opacity, cooling efficiency, and stability. Conversely, the time-dependent and nonaxisymmetric structures produced by...
Ryota Yamamuro, Ryoki Matsukoba et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Asteroseismology relies on disk-integrated photometry or radial velocities, in which geometric cancellation suppresses modes of high spherical degree ($l\geq4$). Observations are thus limited to deeply penetrating, low-degree modes, leaving the outer envelope...
Marcus L. Marcussen, Mikkel N. Lund
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
We investigate the impact of turbulence and magnetic field on the formation of unipolar outflows in the gravitational collapse of isolated low-mass cloud cores using three-dimensional non-ideal magnetohydrodynamics simulations. In the models explored in this s...
Daisuke Takaishi, Yusuke Tsukamoto et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Context. Short-term millimeter-wavelength variability in Class II young stellar objects (YSOs) has been considered minimal, often dismissed as very rare in ALMA-based studies on short timescales. However, recent findings suggest that variability on sub-day tim...
D. Krebs, A. Hacar et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
We present a comprehensive spectroscopic census of the Orion Nebula Cluster (ONC), based primarily on low-resolution optical spectroscopy obtained with MMT/Hectospec. We derive spectral types, youth indicators, and accretion diagnostics for 1513 stars located...
Jesús Hernández, Ezequiel Manzo-Martínez et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
We reanalyze the total solar eclipse images taken with a consumer camera during the Artemis II lunar flyby, using the RAW data as ground truth for our previous analysis of the released JPEG image. Calibrated with field stars, the RAW data show that the lens vi...
Kohji Tsumura, Ko Arimatsu
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Trends with stellar elemental abundances and condensation temperature have been proposed as a possible tracer of rocky planet formation. Here we present an alternative explanation, where we show that stellar activity (star spots) can also cause apparent abunda...
Andrew R. Casey, Megan Bedell et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Eclipsing binaries consisting of a solar-type primary and an M dwarf secondary are key laboratories to study objects at the bottom of the main sequence. Fundamental parameters of such stars have a direct impact upon exoplanetary studies, as searches for temper...
Adam T. Stevenson, Yasmin T. Davis et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Precise and accurate measurements of host stars are crucial in the search for Earth-like exoplanets, and M-dwarfs are favourable targets in this quest. Low-mass eclipsing binaries offer unique opportunities to empirically determine stellar masses and radii for...
Yasmin T. Davis, Amaury H. M. J. Triaud et al.
#astro-ph.SR
Prépublication
· 2026 arXiv
EN
Recently, an analog to the t = 0 moment of our Solar System's meteoritic record was identified for the first time around the Class I protostar HOPS-315. Crystalline silicates were found to recondense from SiO gas that cools as it advects upward from a hot ther...
F. J. Ballieux, M. K. McClure et al.
#astro-ph.SR