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Stars are large balls of plasma, predominantly hydrogen and helium. The birth, evolution and death of stars are of particular research interest. Other important topics include understanding the internal processes, such as fusion, that generate great quantities of radiation and the gravitational interactions between stars.
Tides on the star MACHO 80.7443.1718 are so extreme that they crash and break every close passage in the pair of stars’ elliptical orbit. Models show how these breaking tidal waves create a rapidly rotating, shock-heated circumstellar atmosphere every periapse passage.
Three-dimensional simulations of massive star convection show that core-convection-driven gravity wave oscillations at the surface of the star are not the source of ‘red noise’ seen in photometric observations. The search for the source continues.
Using the POSYDON population synthesis code, this study predicts the existence of massive, thirty-solar-mass black-hole binaries in Milky-Way-like galaxies, challenging previous theories.
Transiting Exoplanet Survey Satellite data of the massive star HD 192575 reveal pulsation frequencies that allow the inference of its convective core mass and interior rotation profile, thus providing a calibration point for interior chemical and angular momentum transport mechanisms.
The authors compute the gradient of the Milky Way’s heavy elements as though they were viewing our Galaxy from the outside. This will allow astronomers to compare Galactic measurements with those for other galaxies to understand how typical the Milky Way is.
Multi-unit spectroscopic explorer observations of TW Hya trace the [O I] emission from the inner 1 au of the disk, arising from what is ostensibly a magnetothermal wind. This result questions the strength of the role of photoevaporation in disk dispersal and has implications for planet formation.
The different roles of outflows in the removal of angular momentum from young stellar systems are becoming clearer with high-angular-resolution spectral-line studies.
The mechanisms that generate magnetic fields in stars are complex, but computational models of dynamo action show how magnetic fields can be generated by extremely turbulent flows.
Long-exposure spectra taken with the James Webb Space Telescope (JWST) reveal the most distant galaxies ever observed — back to a time when the Universe was only 2% of its present age.
