109 papers
This study utilizes photochemical simulations of Mars-like exoplanets to demonstrate that elevated water vapor levels significantly suppress the accumulation of abiotic oxygen and ozone, thereby reducing the maximum predicted false positive O2 abundance to approximately 2.7% and refining the criteria for distinguishing true biosignatures.
The paper reports the discovery of Gaia-GIC-1, a young F-type star exhibiting high-amplitude optical dimming and sustained infrared brightening caused by a massive, hot dust cloud resulting from a catastrophic planetary collision, offering a unique opportunity to study terrestrial planet formation.
This paper reports the discovery and statistical validation of TOI-4616 b, an Earth-sized planet orbiting a nearby mid-M dwarf, which serves as a valuable benchmark system for comparative studies and future atmospheric investigations of terrestrial planets.
This paper presents a novel, automated methodology using the HEALPix framework and a comprehensive data processing pipeline to debias meteor observations from the Desert Fireball Network, successfully quantifying clear-sky coverage and measuring the flux of the 2015 Southern Taurid meteor shower to address challenges in estimating meteoroid flux density.
This paper presents the technical specifications, calibration status, and planned operational strategies of the Asteroid Framing Cameras on ESA's Hera mission, which are designed to support navigation and scientific investigations—including hazard detection, shape reconstruction, and surface mapping—of the Didymos binary asteroid system and the DART impact site on Dimorphos.
By applying a novel data-driven spectral factorization to JWST observations of Europa's leading hemisphere, this study reveals that CO2 enrichment extends beyond Tara Regio in a lens-like pattern across chaos units, suggesting that volatile retention is driven by near-surface microphysics and offering new insights into surface-interior exchange and the moon's habitability.
By analyzing Transit Timing Variations (TTVs) in the warm sub-Saturn HD 332231 b using TESS and ground-based data, researchers detected a coherent 6.7-year signal with a 45-minute amplitude, providing strong evidence for a non-transiting external planetary companion in a high-order mean-motion resonance that makes HD 332231 a dynamically interacting multi-planet system.
This study utilizes LAMOST Data Release 11 cross-correlated with multiple optical and infrared surveys to identify 139 white dwarf candidates exhibiting infrared excess, comprising potential companions like M dwarfs and brown dwarfs as well as debris disks, while emphasizing the need for high-resolution follow-up observations to confirm these findings.
China's Tianwen-1 spacecraft made history by capturing the first deep-space images of the interstellar object 3I/ATLAS from Mars, revealing a coma dominated by large dust grains and providing unique constraints on its dust dynamics and potential origin in the outer regions of a parent planetary disk.
This paper introduces a new 3D dynamical model, SOCOL:14C-Ex, to analyze the atmospheric production and transport of radiocarbon during extreme solar particle events, enabling the precise characterization and strength assessment of seven major Miyake events over the past 14,000 years, with the 12351 BC event identified as the strongest overall and the AD 774 event as the strongest of the Holocene.
This paper proposes a unified two-channel framework for atmospheric escape that replaces the traditional binary distinction between hydrodynamic and Jeans escape with a smooth transition where collisional and collisionless particle behaviors coexist and interact, fundamentally altering how mass and momentum are lost from hydrogen-rich atmospheres.
This paper presents a systematic transit survey of 121 newly accessible mid-to-late M-dwarfs using TESS Cycle 6+ data, which identified 20 transit-like signals across 16 systems and established a robust reliability framework to prioritize two high-confidence candidates for radial velocity follow-up while flagging others for further observation.
This paper evaluates the spectral method-based Dedalus3 software for exoplanet atmospheric dynamics by testing it on a jet instability scenario, simulating Jupiter's zonal jets, and comparing hot-Jupiter flows, ultimately concluding that while it is a useful tool, careful problem-specific testing and execution are essential.
This study employs chemical kinetics models to demonstrate that an enhanced carbon-to-oxygen (C/O) ratio is necessary to explain the observed hydrocarbon-rich chemistry in the inner disks of very low-mass stars, although a degeneracy between the C/O ratio and stellar X-ray luminosity remains.
This paper theoretically catalogs and quantifies the diffraction effects, interference patterns, and stellar diameter influences on central flashes during stellar occultations by solar system objects, providing specific analytical models for flash height and width under various atmospheric and observational conditions.
This paper proposes that exoplanets in the habitable zone can naturally evolve into retrograde rotation through a smooth, non-catastrophic process where atmospheric torques eventually overcome tidal torques, causing a bifurcation from synchronous rotation similar to the mechanism believed to have reversed Venus's spin.
This study demonstrates that Ganymede's subsurface ocean circulation generates detectable magnetic signatures, up to 9 nT, which are distinguishable from the planet's intrinsic field at high spherical harmonic degrees, thereby highlighting the necessity for low-altitude orbits for the JUICE probe to observe these ocean dynamics.
This paper proposes and validates an autonomous star-based navigation method for deep-space missions up to 250 AU that utilizes stellar parallactic shifts to achieve sub-AU position accuracy, thereby reducing reliance on Earth-based radiometric tracking.
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 an open-source dynamical box model to simulate global abiotic sulfur cycling on Earth-like planets, revealing that the absence of life would result in marine sediment sulfate concentrations two orders of magnitude higher and sulfide concentrations four orders of magnitude lower than on present-day Earth.