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The Galactic Underworld: The spatial distribution of compact remnants
David Sweeney, Peter Tuthill, Sanjib Sharma +1
We chart the expected Galactic distribution of neutron stars and black holes. These compact remnants of dead stars -- the Galactic underworld -- are found to exhibit a fundamentall…
Streams on FIRE: Populations of Detectable Stellar Streams in the Milky Way and FIRE
Nora Shipp, Nondh Panithanpaisal, Lina Necib +18
We present the first detailed study comparing the populations of stellar streams in cosmological simulations to observed Milky Way dwarf galaxy streams. In particular, we compare s…
Can radial motions in the stellar halo constrain the rate of change of mass in the Galaxy?
Sanjib Sharma, Joss Bland-Hawthorn, Joseph Silk +1
A change in the mass of the Galaxy with time will leave its imprint on the motions of the stars, with stars having radially outward (mass loss) or inward (mass accretion) bulk moti…
Discovery of post-mass-transfer helium-burning red giants using asteroseismology
Yaguang Li, Timothy R. Bedding, Simon J. Murphy +14
A star expands to become a red giant when it has fused all the hydrogen in its core into helium. If the star is in a binary system, its envelope can overflow onto its companion or…
Measuring the Streaming motion in the Milky Way disc with Gaia EDR3 +
Shourya Khanna, Sanjib Sharma, Joss Bland-Hawthorn +1
We map the 3D kinematics of the Galactic disc out to 3.5 kpc from the Sun, and within 0.75 kpc from the midplane of the Galaxy. To this end, we combine high quality astrometry from…
Chemical Evolution with Radial Mixing Redux: Extending beyond the Solar Neighborhood
Boquan Chen, Michael R. Hayden, Sanjib Sharma +3
We present a multi-zone galactic chemical evolution (GCE) model for the Milky Way that takes the most recently updated yields of major nucleosynthesis channels into account. It inc…