176 papers
Using high-precision radial velocities from HARPS-N combined with Gaia DR3 astrometry, the GAPS programme confirmed that the companion HD 128717 B (Gaia-6 B) is a long-period, high-eccentricity brown dwarf with a mass of approximately 20 Jupiter masses, correcting a previously inaccurate orbital solution derived solely from Gaia data.
By combining high-resolution spectroscopy from the Seimei telescope with continuous TESS photometry, this study demonstrates that the integrated Doppler imaging and light curve inversion method significantly improves the accuracy of reconstructing surface spot distributions and flare origins on the pre-main-sequence star PW And, particularly resolving features at low latitudes and in the southern hemisphere that are poorly constrained by spectroscopy alone.
This paper introduces a Fourier-based inversion method that analyzes gravity-mode period spacing modulations to precisely locate and characterize internal buoyancy glitches in pulsating stars, thereby enabling rapid constraints on stellar age, composition gradients, and internal mixing processes.
This paper presents a comprehensive photometric and spectroscopic analysis of the fast, linearly declining Type Ibn supernova SN 2024acyl, revealing that its properties are best explained by ejecta interacting with a helium-rich circumstellar medium originating from a low-mass helium star in an interacting binary system.
This paper presents AT2022kak, an extremely fast-evolving and faint dwarf nova candidate located in the Galactic thick disk, which is a rare potential Population II system identified through its rapid outbursts and spectroscopic characterization.
This paper presents the largest ground-based catalogue of 1,229 M-dwarf flares identified in Zwicky Transient Facility data, revealing correlations between flare frequency and spectral subtype or Galactic height while establishing a framework for future wide-field surveys.
This paper presents a comprehensive grid of over 38,000 massive binary evolution models using MESA to characterize the diverse surface properties, evolutionary stages, and chemical abundances of post-mass transfer stars, providing a crucial tool for distinguishing binary interaction products from single stars and improving supernova progenitor identification.
Using high-resolution spectropolarimetric observations and advanced modeling, this study reveals that a C5.1 solar flare and filament eruption in NOAA 12561 was triggered by low-altitude magnetic reconnection in a sheared, high-energy precursor region, leading to significant atmospheric heating, downflows, and a 30% reduction in free energy as post-flare loops formed.
The paper argues that cool supergiants at extremely low metallicity are limited by a constant upper luminosity due to a metallicity-independent late-phase mass loss mechanism that strips hydrogen layers, allowing massive stars to evolve into hot, helium-rich objects capable of producing hard ionizing radiation and contributing to early Universe nitrogen enrichment.
This paper introduces a flexible, parallel framework called Arepo-GW that integrates binary population synthesis with hydrodynamic simulations to generate gravitational wave event catalogs, demonstrating its application on the MillenniumTNG suite to reveal merger rates and progenitor properties consistent with current observations while highlighting specific discrepancies in binary black hole merger rates and redshift evolution.
This paper presents an analytical model demonstrating that the time evolution of polarization signals in Type II supernovae with confined circumstellar material can be used to constrain the disk's geometric and physical parameters, successfully applying this framework to explain the observations of SN 2023ixf and thereby offering insights into the mass-loss mechanisms of massive stars.
This study utilizes Self-Organizing Maps on VISTA near- and mid-infrared images of approximately 10,000 Young Stellar Objects in the Orion complex to create a non-theoretical, data-driven grid of morphological prototypes and probabilistic maps linking these morphologies to evolutionary stages, thereby establishing a foundation for a novel spectro-morphological classification scheme.
This paper presents a new selection method using eROSITA X-ray data and optical catalogs to identify period-bounce cataclysmic variables, successfully confirming six new systems (including one previously unknown) with TESS and SDSS follow-up, thereby increasing the known population of these rare objects by 18% to 39.
This paper resolves the discrepancy between Kazantsev theory and numerical simulations regarding small-scale dynamo decay at small Prandtl numbers by demonstrating that the observed exponential decay is a temporary effect caused by large-scale velocity correlator flattening, which corresponds to a long-living virtual level in the associated Schrödinger-type equation.
This paper presents the first Far-UV spectrum of the T-Tauri star TW Hya obtained by the UVIT/AstroSat, demonstrating its capability to derive accretion parameters and characterize young stellar variability consistent with literature and previous space-based observatories.
Using 22 years of INTEGRAL/SPI data to analyze 18 nearby pre-supernova stars, this study finds no evidence of axion-like particle-induced emission and establishes some of the strongest constraints to date on ALP-photon and ALP-electron couplings for masses up to $10^{-11}$ eV.