Far-UV spectroscopy of two hot subdwarfs reveals extreme heavy-element enrichments with patterns matching i-process nucleosynthesis, indicating self-enrichment rather than diffusion.
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representative citing papers
A new 3D non-LTE Ag I model atom yields a solar silver abundance of 1.15 ± 0.08, raising the prior value by 0.19 dex and shrinking the meteoritic offset to 0.06 dex.
3D NLTE sodium abundance corrections relative to 1D LTE are typically negative and larger for saturated lines in giants, reaching -0.7 dex, with a public grid released for use.
Simulations show that 10-30% pollution from supermassive star ejecta reproduces the nitrogen-enhanced abundance pattern of GN-z11 and some other high-z galaxies.
Niebla is an open-source phenomenological code for computing the EBL spectrum via stellar population evolution and multiple dust re-emission models, with three fitted versions and a blazar simulation demonstrating infrared sensitivity.
A multi-parameter fuzzy classification using sigmoidal membership functions derived from Gaussian mixture models on SDSS data yields less contaminated red and green-valley samples with clearer physical trends than hard-boundary methods.
Fast-rotating green valley galaxies maintain higher metallicities than slow-rotating ones because slow rotators experience stronger outflows and more mergers that deplete their chemical content.
MWC 656 hosts a hot stripped star companion of 1.48 solar masses instead of a black hole.
N/O ratios in z~3 star-forming galaxies are indistinguishable from low-redshift values over the metallicity range 12+log(O/H)=7.5-8.44.
The local Hubble constant is measured as 73.04 ± 1.04 km/s/Mpc from Cepheid-calibrated Type Ia supernovae, showing a 5-sigma discrepancy with the Planck+LCDM prediction.
MIST provides a new publicly available grid of solar-scaled stellar isochrones and evolutionary tracks computed self-consistently with MESA from pre-main sequence through advanced stages for masses 0.1-300 solar masses and metallicities -2 to 0.5.
Stellar models require a convective step-overshoot of 1.2 to match the observed k2 in HD 152248, showing that standard models produce insufficient core-to-envelope density contrast in massive stars.
FastChem 4 adds a multidimensional Newton solver, logarithmic element densities, adaptive regularization for condensates, and an expanded database of 800 gas species and 511 condensates across 44 elements, yielding improved convergence and new condensation sequences for solar and carbon-rich cases.
Reddening maps of the LMC and SMC are produced via SED fitting of RGB stars from SMASH and VMC photometry, yielding mean E(B-V) of 0.076 mag and 0.058 mag with relative spatial structure stable across three stellar atmosphere models but absolute values differing by up to 0.03 mag.
Green Pea and Blueberry galaxies live in isolated low-density environments with the lowest neighbor counts among compared galaxy populations.
KIC 3868420 is a newly identified high-amplitude δ Scuti-γ Dor hybrid star in the Hertzsprung gap with best-fit mass 2.26-2.30 solar masses, radius 4.41-4.43 solar radii, and age about 540 million years from frequency matching.
Monte Carlo tests with mock clusters show that fitting Gaia-like photometry with isochrones from different stellar codes produces biases of 0.6 to 1.5 in ΔY/ΔZ unless identical models are used for generation and fitting.
Veiling-corrected lithium abundances in eight young clusters peak at 3.3-3.8 dex with upper age limits of ~5 Myr, alongside slightly sub-solar iron and barium overabundances up to 0.75 dex.
Stacking analysis yields L-M slope 1.56, slightly steeper than self-similar, with X-ray detected clusters showing more centrally concentrated profiles than undetected ones.
Tayler-Spruit magnetic fields can convert low-frequency internal gravity waves to magneto-gravity waves in low-mass star cores, with effects strongest on the red giant branch in central regions.
Realistic 1D neutrino-driven explosions produce lower Fe-peak yields and different lighter-element patterns than piston or bomb models, with explodability driving discrepancies across FRANEC, KEPLER, and MESA progenitors.
Palomar 15 has [Fe/H] = -1.94 dex with no significant abundance spreads, alpha-element patterns typical of outer halo objects, and one star showing elevated Na and Al suggestive of multiple populations.
Planet-hosting wide binaries display diverse differential abundance trends with condensation temperature that are not universal across systems.
MESA gains simultaneous binary star evolution, large nuclear networks, implicit hydrodynamics, and GYRE pulsation coupling for better massive star and supernova modeling.
citing papers explorer
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Evidence for neutron capture in heavy-metal hot subdwarfs: Far-UV spectroscopy of EC22536-5304 and LSIV-14 116
Far-UV spectroscopy of two hot subdwarfs reveals extreme heavy-element enrichments with patterns matching i-process nucleosynthesis, indicating self-enrichment rather than diffusion.
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Ag I model atom and the 3D non-LTE solar silver abundance
A new 3D non-LTE Ag I model atom yields a solar silver abundance of 1.15 ± 0.08, raising the prior value by 0.19 dex and shrinking the meteoritic offset to 0.06 dex.
-
3D NLTE Sodium abundances in late-type stars. Abundance corrections and synthetic spectra
3D NLTE sodium abundance corrections relative to 1D LTE are typically negative and larger for saturated lines in giants, reaching -0.7 dex, with a public grid released for use.
-
Nitrogen enhancement of GN-z11 by metal pollution from supermassive stars
Simulations show that 10-30% pollution from supermassive star ejecta reproduces the nitrogen-enhanced abundance pattern of GN-z11 and some other high-z galaxies.
-
Niebla: an open-source code for modeling the extragalactic background light
Niebla is an open-source phenomenological code for computing the EBL spectrum via stellar population evolution and multiple dust re-emission models, with three fitted versions and a blazar simulation demonstrating infrared sensitivity.
-
A Multi-parameter Fuzzy Set Framework for Classifying Red, Blue, and Green Valley Galaxies
A multi-parameter fuzzy classification using sigmoidal membership functions derived from Gaussian mixture models on SDSS data yields less contaminated red and green-valley samples with clearer physical trends than hard-boundary methods.
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Contrasting evolutionary pathways of fast- and slow-rotating galaxies in the green valley
Fast-rotating green valley galaxies maintain higher metallicities than slow-rotating ones because slow rotators experience stronger outflows and more mergers that deplete their chemical content.
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Ultraviolet spectroscopy reveals a hot and luminous companion to the Be star+black hole candidate MWC 656
MWC 656 hosts a hot stripped star companion of 1.48 solar masses instead of a black hole.
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Nitrogen abundances in star-forming galaxies 2.2 Gyr after the Big Bang are not elevated
N/O ratios in z~3 star-forming galaxies are indistinguishable from low-redshift values over the metallicity range 12+log(O/H)=7.5-8.44.
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A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
The local Hubble constant is measured as 73.04 ± 1.04 km/s/Mpc from Cepheid-calibrated Type Ia supernovae, showing a 5-sigma discrepancy with the Planck+LCDM prediction.
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MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
MIST provides a new publicly available grid of solar-scaled stellar isochrones and evolutionary tracks computed self-consistently with MESA from pre-main sequence through advanced stages for masses 0.1-300 solar masses and metallicities -2 to 0.5.
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The Beauty of k2: Probing Stellar Interiors Using Apsidal Motion. I. The Benchmark Massive Binary HD 152248
Stellar models require a convective step-overshoot of 1.2 to match the observed k2 in HD 152248, showing that standard models produce insufficient core-to-envelope density contrast in massive stars.
-
FastChem 4: New chemical elements and improved convergence behaviour
FastChem 4 adds a multidimensional Newton solver, logarithmic element densities, adaptive regularization for condensates, and an expanded database of 800 gas species and 511 condensates across 44 elements, yielding improved convergence and new condensation sequences for solar and carbon-rich cases.
-
Reddening maps of the Magellanic Clouds using spectral energy distribution fitting of red giants
Reddening maps of the LMC and SMC are produced via SED fitting of RGB stars from SMASH and VMC photometry, yielding mean E(B-V) of 0.076 mag and 0.058 mag with relative spatial structure stable across three stellar atmosphere models but absolute values differing by up to 0.03 mag.
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Blueberry and Green Pea galaxies live in low density environments
Green Pea and Blueberry galaxies live in isolated low-density environments with the lowest neighbor counts among compared galaxy populations.
-
KIC 3868420: A high-amplitude $\delta$ Scuti-$\gamma$ Dor hybrid star crossing the Hertzsprung gap
KIC 3868420 is a newly identified high-amplitude δ Scuti-γ Dor hybrid star in the Hertzsprung gap with best-fit mass 2.26-2.30 solar masses, radius 4.41-4.43 solar radii, and age about 540 million years from frequency matching.
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A critical analysis of main-sequence fitting in open clusters to derive the helium-to-metal enrichment ratio $\Delta Y/\Delta Z$
Monte Carlo tests with mock clusters show that fitting Gaia-like photometry with isochrones from different stellar codes produces biases of 0.6 to 1.5 in ΔY/ΔZ unless identical models are used for generation and fitting.
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PENELLOPE: IX. Lithium, iron and barium elemental abundances in eight nearby young clusters
Veiling-corrected lithium abundances in eight young clusters peak at 3.3-3.8 dex with upper age limits of ~5 Myr, alongside slightly sub-solar iron and barium overabundances up to 0.75 dex.
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The eROSITA Final Equatorial-Depth Survey (eFEDS): X-ray stacking analysis of Subaru's optically selected clusters spanning low richness regime
Stacking analysis yields L-M slope 1.56, slightly steeper than self-similar, with X-ray detected clusters showing more centrally concentrated profiles than undetected ones.
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Co-existence of Internal Gravity Waves and Tayler-Spruit Magnetic Fields in the Radiative Core of Low-mass Stars
Tayler-Spruit magnetic fields can convert low-frequency internal gravity waves to magneto-gravity waves in low-mass star cores, with effects strongest on the red giant branch in central regions.
-
Explodability matters: how realistic neutrino-driven explosions change explosive nucleosynthesis yields
Realistic 1D neutrino-driven explosions produce lower Fe-peak yields and different lighter-element patterns than piston or bomb models, with explodability driving discrepancies across FRANEC, KEPLER, and MESA progenitors.
-
Chemical composition of the outer halo globular cluster Palomar 15
Palomar 15 has [Fe/H] = -1.94 dex with no significant abundance spreads, alpha-element patterns typical of outer halo objects, and one star showing elevated Na and Al suggestive of multiple populations.
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Chemical signatures of planetary systems in their host stars. Near-infrared spectroscopy of four planet-hosting wide binaries
Planet-hosting wide binaries display diverse differential abundance trends with condensation temperature that are not universal across systems.
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Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
MESA gains simultaneous binary star evolution, large nuclear networks, implicit hydrodynamics, and GYRE pulsation coupling for better massive star and supernova modeling.