ARC Centre of Excellence for All-sky Astrophysics

A fast radio burst at redshift 2, three billion years after the Big Bang

Fast radio bursts (FRBs) are millisecond-duration radio transients from extragalactic sources. Their frequency and polarization properties are affected by plasma and magnetic fields along the line of sight to Earth. We report radio observations of FRB 20240304B and near-infrared...

Double Trouble: How Unresolved Spectroscopic Binary Stars Skew GALAH DR4 Stellar Parameters

Abstract Unresolved binary stars introduce systematic biases in stellar parameter estimates when analysed assuming a single star. Using ~917,000 spectra from the Galactic Archaeology with HERMES (GALAH) Data Release 4 (DR4), we develop a binary spectral model that fits each obser...