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astro-ph.SR2025

Binarity at LOw Metallicity (BLOeM): a spectroscopic VLT monitoring survey of massive stars in the SMC

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

Surveys in the Milky Way and Large Magellanic Cloud revealed that the majority of massive stars will interact with companions during their lives. However, knowledge of the binary p…

astro-ph.SR2025

Good things always come in 3s: trimodality in the binary black-hole chirp-mass distribution supports bimodal black-hole formation

Reinhold Willcox, Fabian R. N. Schneider, Eva Laplace +7

The latest GWTC-4 release from the LIGO-Virgo-KAGRA (LVK) collaboration nearly doubles the known population of double compact object mergers and reveals a new trimodal structure in…

astro-ph.SR2025

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…

astro-ph.SR2025

Rapid stellar and binary population synthesis with COMPAS: methods paper II

Ilya Mandel, Jeff Riley, Adam Boesky +13

The COMPAS public rapid binary population synthesis code has undergone a number of key improvements since the original COMPAS methods paper (Team COMPAS: Riley et al., 2022) was pu…

astro-ph.SR2025

Binarity at LOw Metallicity (BLOeM): Bayesian inference of natal kicks from inert black hole binaries

R. Willcox, P. Marchant, A. Vigna-Gómez +15

Context. The emerging population of inert black hole binaries (BHBs) provides a unique opportunity to constrain black hole (BH) formation physics. These systems are composed of a s…