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R-process enrichment from a single event in an ancient dwarf galaxy
Alexander P. Ji, Anna Frebel, Anirudh Chiti +1
Elements heavier than zinc are synthesized through the (r)apid and (s)low neutron-capture processes. The main site of production of the r-process elements (such as europium) has be…
High-resolution spectroscopy of extremely metal-poor stars in the least evolved galaxies: Bootes II
Alexander P. Ji, Anna Frebel, Joshua D. Simon +1
We present high-resolution Magellan/MIKE spectra of the four brightest confirmed red giant stars in the ultra-faint dwarf galaxy Bootes II (Boo II). These stars all inhabit the met…
Preserving chemical signatures of primordial star formation in the first low-mass stars
Alexander P. Ji, Anna Frebel, Volker Bromm
We model early star forming regions and their chemical enrichment by Population III (Pop III) supernovae with nucleosynthetic yields featuring high [C/Fe] ratios and pair-instabili…
The Caterpillar Project: A Large Suite of Milky Way Sized Halos
Brendan F. Griffen, Alexander P. Ji, Gregory A. Dooley +4
We present the largest number of Milky Way sized dark matter halos simulated at very high mass ( M/particle) and temporal resolution (5 Myrs/snapshot) don…