R-process enhancements of Gaia-Enceladus in GALAH DR3

  title={R-process enhancements of Gaia-Enceladus in GALAH DR3},
  author={Tadafumi Matsuno and Yutaka Hirai and Yuta Tarumi and Kenta Hotokezaka and Masaomi Tanaka and Amina Helmi},
  journal={Astronomy and Astrophysics},
The dominant site of production of $r$-process elements remains unclear despite recent observations of a neutron star merger. Observational constraints on the properties of the sites can be obtained by comparing $r$-process abundances in different environments. The recent Gaia data releases and large samples from high-resolution optical spectroscopic surveys are enabling us to compare $r$-process element abundances between stars formed in an accreted dwarf galaxy, Gaia-Enceladus, and those… 

Figures from this paper

The Most Metal-poor Stars in the Magellanic Clouds Are r-process Enhanced
The chemical abundances of a galaxy’s metal-poor stellar population can be used to investigate the earliest stages of its formation and chemical evolution. The Magellanic Clouds are the most massive
Evidence from Disrupted Halo Dwarfs that r-process Enrichment via Neutron Star Mergers is Delayed by ≳500 Myr
The astrophysical origins of r-process elements remain elusive. Neutron star mergers (NSMs) and special classes of core-collapse supernovae (rCCSNe) are leading candidates. Due to these channels’
The Complexity of the Cetus Stream Unveiled from the Fusion of STREAMFINDER and StarGO
We combine the power of two stream-searching tools, STREAMFINDER and StarGO applied to the Gaia EDR3 data, to detect stellar debris belonging to the Cetus stream system that forms a complex, nearly
Origin of metals in old Milky Way halo stars based on GALAH and Gaia
Stellar and supernova nucleosynthesis in the first few billion years of the cosmic history have set the scene for early structure formation in the Universe, while little is known about their
Evidence for sub-Chandrasekhar Type Ia supernovae from the last major merger
We investigate the contribution of sub-Chandrasekhar mass Type Ia supernovae to the chemical enrichment of the Gaia Sausage galaxy, the progenitor of a significant merger event in the early life of
CAPOS: The bulge Cluster APOgee Survey
We present results from a study of 15 red giant members of the intermediate-metallicity globular cluster (GC) FSR 1758 using high-resolution, near-infrared spectra collected with the Apache Point
NGC 1261: An r-process enhanced globular cluster from the Gaia-Enceladus event
Our Milky Way (MW) has witnessed a series of major accretion events in the past. One of the later additions, the Gaia-Enceladus merger, has contributed a considerable mass to the inner Galaxy, but
Reconstructing the Last Major Merger of the Milky Way with the H3 Survey
Several lines of evidence suggest that the Milky Way underwent a major merger at z ∼ 2 with the Gaia-Sausage-Enceladus (GSE) galaxy. Here we use H3 Survey data to argue that GSE entered the Galaxy on


The Observation and Analysis of Stellar Photospheres
This textbook describes the equipment, observational techniques, and analysis used in the investigation of stellar photospheres. Now in its fourth edition, the text has been thoroughly updated and
R-process enhancements of Gaia-Enceladus in GALAH
  • 2020
R-process enhancements of Gaia-Enceladus in GALAH DR3