The origins of the elements and isotopes of cosmic material is a critical aspect of
understanding the evolution of the universe. Nucleosynthesis typically requires physical …

To reach a deeper understanding of the origin of elements in the periodic table, we construct
Galactic chemical evolution (GCE) models for all stable elements from C (A= 12) to U (A …

Light curves, explosion energies, and remnant masses are calculated for a grid of
supernovae resulting from massive helium stars that have been evolved including mass …

We describe the discovery of a solar neighborhood (d= 468 pc) binary system with a main-
sequence sunlike star and a massive noninteracting black hole candidate. The spectral …

The mantra “know thy star, know thy planet” has proven to be very important for many
aspects of exoplanet science. Here I review how stellar abundances inform our …

Direct imaging studies have mainly used low-resolution spectroscopy (R∼ 20–100) to study
the atmospheres of giant exoplanets and brown dwarf companions, but the presence of …

The nature of the first Pop III stars is still a mystery and the energy distribution of the first
supernovae is completely unexplored. For the first time we account simultaneously for the …

Massive sets of stellar spectroscopic observations are rapidly becoming available and these
can be used to determine the chemical composition and evolution of the Galaxy with …

The first stars were born from chemically pristine gas. They were likely massive, and thus
they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy …

The metal-poor stars in the Galactic halo are thought to show the imprints of the first (Pop III)
stars, and thus provide a glance at the first episodes of star formation. In this work, we aim at …