173 papers
This study utilizes 3D soft-sphere coagulation simulations to demonstrate that higher temperatures and polydisperse monomer size distributions lead to denser, more compact dust aggregates, while also evaluating the reliability of eight structural metrics and identifying the average number of contact points as the least effective measure.
By performing the first direct measurement of the ON reaction at astrophysical energies, researchers determined a thermonuclear rate approximately 1.5 times higher than standard values, thereby ruling out a previously suggested seven-fold enhancement and concluding that this reaction alone cannot explain observed calcium-to-sulphur and argon-to-sulphur ratio variations in Type Ia supernovae.
By integrating kinetic modeling with RHESSI and Solar Orbiter/STIX X-ray observations of three large flares, this study constrains solar flare acceleration properties, revealing that extended turbulent regions covering approximately 25% of the flare loop and acceleration timescales between 7 and 22 seconds are required to match observed data.
This study demonstrates that angular momentum-driven accretion disks in common envelope systems containing a neutron star and a massive companion facilitate the synthesis of significant rp-process products and alpha-rich elements like Ti and Ni, offering a new mechanism for galactic chemical evolution.
This study demonstrates that velocity dispersion analysis (VDA) often yields inaccurate solar injection times and path lengths for Solar Energetic Particles because the method is significantly biased by interplanetary magnetic turbulence and the energy dependence of the pre-event proton background.
This paper presents a search for outbursts in symbiotic binaries using GOTO and ATLAS photometric data, successfully identifying five systems with confirmed or ongoing Z And-type outbursts, including the first reported event in the Large Magellanic Cloud, thereby highlighting the importance of historical photometry for characterizing these poorly understood phenomena.
This paper proposes that quasi-periodic oscillations observed in both radio flux and linear polarization of black hole jets are caused by kink instability, a conclusion supported by simulations that successfully reproduce the observed modulations and the anti-correlation between flux and polarization.
This study introduces a novel machine learning method coupled with Bayesian optimization to simultaneously fit ALMA images and spectral energy distributions of protoplanetary discs, revealing that this approach yields more accurate dust mass estimates and demonstrates a significant decrease in disc scale height and flaring from Class I to Class II objects.
This paper presents and validates an iterative, regularized method for reconstructing the height-temperature profile of the solar atmosphere above active regions by analyzing multi-frequency gyroresonance radio observations from the RATAN-600 telescope, demonstrating its effectiveness in reproducing observed spectra with high accuracy.
This study utilizes surface flux transport modeling and randomized simulations to demonstrate that the non-random longitudinal distribution of active regions, particularly recurrent flux emergence in the southern hemisphere, significantly reinforced the large-scale equatorial magnetic field during the declining phase of solar cycle 24, while also showing that incorporating both axial and equatorial dipole components provides better constraints for model optimization than using the axial dipole alone.
This paper presents revised reconstructions of total and spectral solar irradiance over the past four centuries using an updated physics-based SATIRE-T model that links magnetic field evolution to sunspot records, successfully reproducing satellite observations and revealing a secular increase in irradiance between the 17th and 21st centuries.
The paper presents the TESS All-Sky Rotation Survey (TARS), a new homogeneous catalog containing rotation periods for 944,056 stars within 500 pc that significantly expands the available data for stellar age and activity studies while introducing methods to correct period aliases and providing open-source tools for further analysis.
This White Paper advocates for a coordinated UK programme integrating high-precision observations, advanced theory, and machine learning to advance Magnetohydrodynamic (MHD) seismology, thereby addressing critical solar physics challenges and enhancing space weather forecasting capabilities.
This paper presents a universal theoretical model that successfully predicts the maximum energy limits of radiation belts across planetary and brown dwarf magnetospheres using only surface magnetic field strength, revealing a 7 TeV asymptotic bound and offering new insights into galactic cosmic ray sources and exoplanet habitability.
This paper introduces TILARA, a novel template-independent, line-by-line algorithm for deriving precise radial velocities that effectively mitigates biases from reference spectra and demonstrates performance comparable to existing methods when applied to ESPRESSO observations of the Sun-like star HD 102365.
This study presents the first definitive eight-sigma detection of the C3 molecule in Titan's atmosphere using ultra-high-resolution VLT-ESPRESSO observations, confirming a column density consistent with photochemical models and demonstrating the efficacy of exoplanet research techniques for Solar System targets.
Based on spectroscopic and photometric observations, this study characterizes HD 188101 as a spotted, weakly magnetic B9 main-sequence star exhibiting abundance anomalies typical of chemically peculiar He-weak SiTiSr stars, including overabundances of Si, Ti, and Sr, a helium deficiency, and phase-dependent spectral line variations.
This study characterizes the stellar content and star formation activity in the IRAS 18456-0223 region by identifying 89 young stellar objects with masses up to 7.2 solar masses and ages up to 4 Myr, analyzing their clustering properties, variability, and association with cold, dense filaments using multiwavelength data and spectroscopy.
This study evaluates three different Extreme ultraviolet Imaging Spectrometer (EIS) line pair diagnostics for measuring the First Ionisation Potential (FIP) bias in the solar atmosphere, demonstrating that while signal-to-noise cutoffs influence the distribution's high-value tail, the median FIP bias remains stable, thereby highlighting the need for a nuanced approach rather than a one-size-fits-all methodology.
This study utilizes full-disk IRIS spectroheliograms to compare active regions at different evolutionary stages, revealing that while C II and Si IV lines show no clear variability, Mg II opacity distributions in regions with high FIP bias suggest variable plasma densities that warrant further combined observational and modeling investigation to understand plasma fractionation mechanisms.