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SMHASH: Anatomy of the Orphan Stream using RR Lyrae stars
David Hendel, Victoria Scowcroft, Kathryn V. Johnston +30
Stellar tidal streams provide an opportunity to study the motion and structure of the disrupting galaxy as well as the gravitational potential of its host. Streams around the Milky…
Kronos & Krios: Evidence for accretion of a massive, rocky planetary system in a comoving pair of solar-type stars
Semyeong Oh, Adrian M. Price-Whelan, John M. Brewer +3
We report and discuss the discovery of a comoving pair of bright solar-type stars, HD 240430 and HD 240429, with a significant difference in their chemical abundances. The two star…
Spectroscopic confirmation of very-wide stellar binaries and large-separation comoving pairs from Gaia DR1
Adrian M. Price-Whelan, Semyeong Oh, David N. Spergel
Members of widely-separated stellar binaries (> 0.1 pc) or loosely bound stellar associations and clusters are born with small spreads in kinematics and chemistry, but disrupt and…
Disk Heating, Galactoseismology, and the Formation of Stellar Halos
Kathryn V. Johnston, Adrian M. Price-Whelan, Maria Bergemann +7
Deep photometric surveys of the Milky Way have revealed diffuse structures encircling our Galaxy far beyond the "classical" limits of the stellar disk. This paper reviews results f…
Improving \textsl{Gaia} parallax precision with a data-driven model of stars
Lauren Anderson, David W. Hogg, Boris Leistedt +2
Converting a noisy parallax measurement into a posterior belief over distance requires inference with a prior. Usually this prior represents beliefs about the stellar density distr…
Galaxy Interactions Trigger Rapid Black Hole Growth: an unprecedented view from the Hyper Suprime-Cam Survey
Andy D. Goulding, Jenny E. Greene, Rachel Bezanson +6
Collisions and interactions between gas-rich galaxies are thought to be pivotal stages in their formation and evolution, causing the rapid production of new stars, and possibly ser…
Sumo Puff: Tidal Debris or Disturbed Ultra-Diffuse Galaxy?
Johnny P. Greco, Jenny E. Greene, Adrian M. Price-Whelan +10
We report the discovery of a diffuse stellar cloud with an angular extent , which we term "Sumo Puff", in data from the Hyper Suprime-Cam Subaru Strategic…
Exploring Halo Substructure with Giant Stars. XV. Discovery of a Connection between the Monoceros Ring and the Triangulum-Andromeda Overdensity?
Ting S. Li, Allyson A. Sheffield, Kathryn V. Johnston +9
Thanks to modern sky surveys, over twenty stellar streams and overdensity structures have been discovered in the halo of the Milky Way. In this paper, we present an analysis of spe…
Gaps and length asymmetry in the stellar stream Palomar 5 as effects of Galactic bar rotation
Sarah Pearson, Adrian M. Price-Whelan, Kathryn V. Johnston
Recent Pan-STARRS data show that the leading arm from the globular cluster Palomar 5 (Pal 5) appears shorter than the trailing arm, while simulations of Pal 5 predict similar angul…