38 citations · 149 across the 10 of their papers we have counts for
5 papers · 1 filter
Binaries drive high Type Ia supernova rates in dwarf galaxies
James W. Johnson, Christopher S. Kochanek, K. Z. Stanek
The scaling of the specific Type Ia supernova (SN Ia) rate with host galaxy stellar mass as measured in ASAS-SN and DES strongly s…
Dwarf galaxy archaeology from chemical abundances and star formation histories
James W. Johnson, Charlie Conroy, Benjamin D. Johnson +8
We model the stellar abundances and ages of two disrupted dwarf galaxies in the Milky Way stellar halo: Gaia-Sausage Enceladus (GSE) and Wukong/LMS-1. Using a statistically robust…
Birth of the Galactic Disk Revealed by the H3 Survey
Charlie Conroy, David H. Weinberg, Rohan P. Naidu +12
We use chemistry ([alpha/Fe] and [Fe/H]), main sequence turnoff ages, and kinematics determined from H3 Survey spectroscopy and Gaia astrometry to identify the birth of the Galacti…
Primordial helium-3 redux: The helium isotope ratio of the Orion nebula
Ryan J. Cooke, Pasquier Noterdaeme, James W. Johnson +5
We report the first direct measurement of the helium isotope ratio, 3He/4He, outside of the Local Interstellar Cloud, as part of science verification observations with the upgraded…
Empirical Constraints on the Nucleosynthesis of Nitrogen
James W. Johnson, David H. Weinberg, Fiorenzo Vincenzo +2
We derive empirical constraints on the nucleosynthetic yields of nitrogen by incorporating N enrichment into our previously developed and empirically tuned multi-zone galactic chem…