Monash University

Weakened inspirals -- I: High mass ratio common envelope interactions in RGB stars

Jack Patrick Nibbs, Orsola De Marco, Lionel Siess +2

The common envelope (CE) interaction between an expanding giant star and a compact companion typically leads to a rapid orbital decay, ending in either a merger or the formation of…

Evolution of Massive Main-sequence Stars in Rapid Population Synthesis. I. Framework and Implementation

Adam Brček, Ryosuke Hirai, Ilya Mandel +1

Stars spend most of their lifetime on the main sequence (MS), where hydrogen burning establishes the internal chemical structure that governs the subsequent evolution. In massive s…

astro-ph.SR2025★ 68 cited

Evidence for the Keplerian orbit of a close companion around a giant star

Mats Esseldeurs, Leen Decin, Joris De Ridder +31

Close companions influence stellar evolution through tidal interactions, mass transfer, and mass loss effects. While such companions are detected around young stellar objects, main…

The s Process and Beyond

Maria Lugaro, Marco Pignatari, René Reifarth +1

Neutron captures produce the vast majority of abundances of elements heavier than iron in the Universe. Beyond the classical slow (s) and rapid (r) processes, there is observationa…

3D Synthetic Convective Velocity Fields to Initialise Core-Collapse Supernova Simulations from 1D Progenitors

Vishnu Varma, Bernhard Mueller, Raphael Hirschi

Core-collapse supernovae (CCSNe) are among the most energetic and complex astrophysical phenomena, requiring threedimensional (3D) simulations to capture their intricate explosion…

astro-ph.SR2025★ 4 cited

Unveiling the nature of HE 0107-5240

E. Caffau, M. Steffen, P. Molaro +27

The vast majority of the most iron-poor stars in the Galaxy exhibit a strong carbon enhancement, with C/H ratios only about two orders of magnitude below solar. This unusual chemic…

astro-ph.SR2025★ 4 cited

Rare Find: Discovery and chemo-dynamical properties of two s-process enhanced RR Lyrae stars

Valentina D'Orazi, Giuliano Iorio, Borbála Cseh +15

We report the serendipitous discovery of two RR Lyrae stars exhibiting significant s-process element enrichment, a rare class previously represented solely by TY Gruis. Our goal is…

astro-ph.SR2025★ 2 cited

Using Binary Population Synthesis to Calculate the Yields of Low- and Intermediate-Mass Binary Populations at Low Metallicity

Zara Osborn, Amanda Karakas, Devika Kamath +3

Asymptotic giant branch (AGB) stars are important to chemical evolution at metallicity $Z \sim 0.0001$ ( $[Fe/H] \approx - 2.2$ ) as they contribute significantly to the produc…

astro-ph.SR2025★ 3 cited

Production of radioactive $^{22}$ Na in core-collapse supernovae: the Ne-E(L) component in presolar grains and its possible consequences on supernova observations

M. Pignatari, S. Amari, P. Hoppe +8

Presolar graphite grains carry the isotopic signatures of their parent stars. A significant fraction of presolar graphites shows isotopic abundance anomalies relative to solar for…

astro-ph.SR2025★ 22 cited

Probing sulfur chemistry in oxygen-rich AGB stars with ALMA

Prasanta Gorai, Maryam Saberi, Theo Khouri +1

Sulfur and its isotopic ratios play a crucial role in understanding astrophysical environments, providing insights into nucleosynthesis, ISM processes, star formation, planetary ev…

A high fraction of close massive binary stars at low metallicity

H. Sana, T. Shenar, J. Bodensteiner +74

At high metallicity, a majority of massive stars have at least one close stellar companion. The evolution of such binaries is subject to strong interaction processes, heavily impac…

s-process Enriched Post-AGB Star J003643.94-723722.1 in the SMC with an Extreme C/O Ratio and the First Precise Detection of Lead

Meghna Menon, Devika Kamath, Maksym Mohorian +6

Post-asymptotic giant branch (post-AGB) stars are exquisite tracers of s-process nucleosynthesis via their surface abundances. We present a comprehensive analysis of J003643.94 $-$ 7…

Exploring giant barium stars: $^{12} C /^{13} C$ ratio and elemental abundances of carbon, nitrogen, and oxygen

M. P. Roriz, N. A. Drake, N. Holanda +4

Barium (Ba) stars belong to binary systems that underwent mass transfer events. As a consequence, their envelopes were enriched with material synthesized in the interiors of their…

astro-ph.SR2025★ 4 cited

Population Synthesis Study on the Binary Origin of Type Ibn Supernovae

Takatoshi Ko, Tomoya Kinugawa, Daichi Tsuna +2

Type Ibn supernovae (SNe) are a class of SN explosions whose progenitors are surrounded by dense helium-rich circumstellar matter (CSM). Some models have been proposed for how to f…

astro-ph.SR2025★ 3 cited

Fast magneto-acoustic waves in the solar chromosphere: Comparison of single-fluid and two-fluid approximations

M. M. Gómez Míguez, D. Martínez-Gómez, E. Khomenko +3

Context: The mechanism behind the heating of the solar chromosphere remains unclear. Friction between neutrals and charges is expected to contribute to plasma heating in a partiall…

Stellar Population Astrophysics (SPA) with the TNG: NLTE atmospheric parameters and abundances of giant stars in 33 Open Clusters

M. Dal Ponte, V. D'Orazi, A. Bragaglia +11

Open clusters serve as important tools for accurately studying the chemical evolution of the Milky Way. By combining precise chemical data from high-resolution spectra with informa…

Impact of a binary companion in AGB outflows on CO spectral lines

Owen Vermeulen, Mats Esseldeurs, Jolien Malfait +7

In the late stage of their evolution, low- to intermediate-mass stars pass through the asymptotic giant branch (AGB) phase, characterised by strong mass loss through dust driven wi…

Asteroseismology of the G8 subgiant beta Aquilae with SONG-Tenerife, SONG-Australia and TESS

Hans Kjeldsen, Timothy R. Bedding, Yaguang Li +28

We present time-series radial velocities of the G8 subgiant star beta Aql obtained in 2022 and 2023 using SONG-Tenerife and, for the first time, SONG-Australia. We also analyse a s…

Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars. II. Abundances and spatial distributions of CS

R. Unnikrishnan, M. Andriantsaralaza, E. De Beck +9

The circumstellar envelopes (CSEs) of asymptotic giant branch (AGB) stars harbour a rich variety of molecules and are sites of complex chemistry. Our current understanding of the c…

Structure and Dynamics of the Sun's Interior Revealed by Helioseismic and Magnetic Imager

Alexander Kosovichev, Sarbani Basu, Yuto Bekki +43

High-resolution helioseismology observations with the Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamics Observatory (SDO) provide a unique three-dimensional view of the…

astro-ph.SR2025★ 7 cited

ATOMIUM: Continuum emission and evidence of dust enhancement from binary motion

T. Danilovich, N. Samaratunge, Y. Mori +35

Low- and intermediate-mass stars on the asymptotic giant branch (AGB) account for a significant portion of the dust and chemical enrichment in their host galaxy. Here we present AL…

astro-ph.SR2025★ 2 cited

Impact of $T$ - and $ρ$ -dependent decay rates and new (n, $γ$ ) cross sections on the $s$ process in low-mass AGB stars

B. Szányi, A. Yagüe López, A. I. Karakas +1

We study the impact of nuclear input related to weak-decay rates and neutron-capture reactions on predictions for the $s$ process in AGB stars. We provide the first database of sur…