Four new transiting giant planets (three Saturn-mass, one dense super-Jupiter) with periods of 1.25-4.17 days have been found orbiting early M-dwarfs, including one around a metal-poor star.
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JWST data revises Kamo`oalewa's spectrum to neutral colors consistent with enstatite-rich silicates, models its size at 18 m and albedo at 0.59, and confirms fast rotation.
First robust detection of kpc-scale filamentary H I structures in the CGM/IGM around NGC 4631 with widths 0.5-3.3 kpc, lengths 6.1-49.8 kpc, and three kinematic classes (U-shaped, linear, wavy).
New HST observations of P/2023 V6 (PANSTARRS) document its transition to dormancy and yield a diameter estimate of approximately 340 meters.
N-body simulations with Swiftest show that surface regolith ejected from ellipsoidal Centaurs can form captured proto-ring disks, with highest efficiency from equatorial avalanches.
Cosmic ray transport in molecular cloud simulations boosts star formation efficiency by up to 43% and yields a top-heavier IMF with a high-mass slope shallower by ~20%.
Hydrolyzed haze analogs from water-rich exoplanet conditions show higher absorptivity and a high imaginary refractive index that flattens spectral features in atmospheric models.
MHD collapse simulations define an Envelope-Disk Transition Zone (ENDTRANZ) where a jump in the j-r profile occurs due to positive gravitational torques, with a corresponding jump detected in ALMA observations of L1527 IRS.
Self-consistent curved dust wall models for T Tauri disks indicate that matching observed JHK colors requires millimeter grains lifted 0.5-3 scale heights above the midplane, implying high midplane turbulence.
New stellar occultation data from 2017-2023 indicates Pluto's atmospheric pressure plateaued from 2015 to 2021 and has started to drop, with lower-atmosphere slope changes consistent with haze settling.
Multi-epoch high-resolution spectroscopy reveals a stagnant [O I] gas reservoir at ~1 au in AB Aurigae that feeds high-rate accretion and crushes the stellar magnetosphere.
A new implementation of radial rays and multigroup radiation transport in Athena++ for frequency-dependent stellar irradiation achieves 2-5% average temperature agreement with Monte Carlo benchmarks in hydrostatic disk models using 64 bands.
New Gemini and JWST data show 450P/LONEOS has a 1.8 km nucleus, CO2 gas production of ~7e24 molec/s, water ice absorption, and activity consistent with CO2 release from crystallizing amorphous ice.
The low-mass IMF in Boötes I is consistent with the Milky Way within 68% confidence for broken power-law and lognormal forms, indicating universality at low metallicity.
A Hamiltonian framework maps coupled spin-orbit, spin-spin, and doubly synchronous resonances in ellipsoid binary asteroids and identifies a secondary resonance from nonlinear coupling between primary and secondary synchronous modes.
Catastrophic disruption of differentiated asteroids creates a sheet-like mix of core and mantle fragments with uniform iron-rock ratios that reaccumulate into iron-rich rubble piles if the core is molten.
A new wide-binary coordinate system in REBOUND's TRACE integrator produces qualitatively correct results for planet-planet scattering, stellar flybys, and ZLK oscillations where prior hybrid integrators fail, while matching IAS15 accuracy at up to 9x speed.
Simulations demonstrate that YSO jet properties are controlled by stellar magnetospheric field strength and rotation, producing counter-rotating jets even from non-rotating stars and allowing upper limits on disk toroidal field from observed outflows.
Massive young star clusters clear their natal gas faster than lower-mass clusters, based on HST and JWST imaging of four galaxies.
ALMA comparison finds starless cores in evolved IRBCs have ~2x higher median mass and density than in early IRDCs, favoring competitive accretion over massive prestellar core models for high-mass star formation.
JWST spectra of EC 53 indicate CO fundamental and H2O bending absorption weaken by ~2 during burst due to continuum dilution, with relative veiling yielding hot-continuum ratios of 2.9 and 1.71 and viscous-disk accretion-rate ratios of ~3.6 and ~2.0.
A brown-dwarf companion's close pericenter in KELT-20 imposes dynamical limits that disfavor giant planet formation beyond the water-ice line.
ALMA Cycle 6 data on Aquila dense cores identifies two starless sources and scale-dependent increases in multiplicity, consistent with turbulent core collapse simulations predicting 1.19 starless detections.
JWST observations of 133P/Elst-Pizarro yield water outgassing rates of (1.9 ± 0.6) × 10^25 and (1.4 ± 0.4) × 10^25 molecules/s at true anomalies 8° and 37.4°, with hypervolatile depletion Q(CO2)/Q(H2O) < 0.009 and an average log(Afrho/Q(H2O)) = -24.6 ± 0.2 across three MBCs.
citing papers explorer
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Modelling the Break in the Specific Angular Momentum within the Envelope-Disk Transition Zone
MHD collapse simulations define an Envelope-Disk Transition Zone (ENDTRANZ) where a jump in the j-r profile occurs due to positive gravitational torques, with a corresponding jump detected in ALMA observations of L1527 IRS.
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Modeling the curved dust sublimation front in protoplanetary disks: a potential probe of midplane turbulence
Self-consistent curved dust wall models for T Tauri disks indicate that matching observed JHK colors requires millimeter grains lifted 0.5-3 scale heights above the midplane, implying high midplane turbulence.
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Direct Optical Evidence of Late-Stage Infall in AB Aurigae: A Stagnant [O I] Reservoir and a Crushed Magnetosphere
Multi-epoch high-resolution spectroscopy reveals a stagnant [O I] gas reservoir at ~1 au in AB Aurigae that feeds high-rate accretion and crushes the stellar magnetosphere.
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Modeling YSO Jets in 3D III: Dependence of Accretion and Jet Properties on Stellar Magnetospheric Field Strength and Rotation
Simulations demonstrate that YSO jet properties are controlled by stellar magnetospheric field strength and rotation, producing counter-rotating jets even from non-rotating stars and allowing upper limits on disk toroidal field from observed outflows.
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Inspecting Cloudy Substellar Atmospheres with JWST MIRI Synthetic Magnitudes from Spitzer Mid-infrared Spectra
F770W minus F1000W colors below 0.03 mag identify L dwarfs seven times more likely to have silicate clouds, while current models underpredict the 9-micron silicate feature.
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A Parameterized YSO Accretion Disk Model with Increasing Accretion Rate: Predicted Outburst Lightcurves
A parameterized accretion disk model for young stellar objects predicts that optical and near-IR outburst light curves track the input accretion rate profile while mid-IR curves respond more to the location and heating of the innermost dust disk.
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The curved jet in the young star FN Tau
New observations show a curved jet from FN Tau likely caused by disk precession, associated with past outbursts.
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Organic complexity in protostellar disk candidates
ALMA survey detects hot corino chemistry in 3/5 Class 0/I protostars with CH3OH column densities 10^17-10^18 cm^{-2} and rotational temperatures 200-250 K, showing two orders of magnitude variation in COM ratios.