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  1. paired: A Statistical Framework for Detecting Stellar Binarity with Gaia RVs. I. Sensitivity to Unresolved Binaries

    Publication
    Data Release 3 (DR3) from the Gaia Mission includes radial velocity measurements of over 33 million targets. Among many scientific applications, the overlap of this stellar sample with …

  2. Dynamics of tidal spiral arms: Machine learning-assisted identification of equations and application to the Milky Way

    Publication
    … that match simulations and provide a simple tool to fit Gaia and external galaxy data. This methodology could be extended to model complex phenomena such as self …

  3. Iron Snails: Nonequilibrium Dynamics and Spiral Abundance Patterns

    Publication
    Galaxies are not in a dynamical steady state: they continually undergo perturbations, e.g., from infalling dwarf galaxies and dark matter substructure. After a dynamical perturbation, stars phase …

  4. Many Elements Matter: Detailed Abundance Patterns Reveal Star Formation and Enrichment Differences among Milky Way Structural Components

    Publication
    Many nucleosynthetic channels create the elements, but two-parameter models characterized by \(\alpha\) and Fe nonetheless predict stellar abundances in the Galactic disk to accuracies of 0.02 …

  5. Stream Members Only: Data-driven Characterization of Stellar Streams with Mixture Density Networks

    Publication
    Stellar streams are sensitive probes of the Milky Way's gravitational potential. The mean track of a stream constrains global properties of the potential, while its fine-grained …

  6. cogsworth: A Gala of COSMIC proportions combining binary stellar evolution and galactic dynamics

    Publication
    We present cogsworth, an open-source Python tool for producing self-consistent population synthesis and galactic dynamics simulations. With cogsworth one can (1) sample a population of binaries …

  7. Carbon enrichment in APOGEE disk stars as evidence of mass transfer in binaries

    Publication
    Carbon abundances in first-ascent giant stars are usually lower than those of their main-sequence counterparts. At moderate metallicities, stellar evolution of single stars cannot account for …

  8. An empirical model of the Gaia DR3 selection function

    Publication
    Interpreting and modelling astronomical catalogues requires an understanding of the catalogues' completeness or selection function: objects of what properties had a chance to end up in the catalogue …

  9. The Open Cluster Chemical Abundances and Mapping Survey. VI. Galactic Chemical Gradient Analysis from APOGEE DR17

    Publication
    The goal of the Open Cluster Chemical Abundances and Mapping (OCCAM) survey is to constrain key Galactic dynamic and chemical evolution parameters by the construction and analysis of …

  10. Multiple phase spirals suggest multiple origins in Gaia DR3

    Publication
    Gaia Data Release 2 revealed that the Milky Way contains significant indications of departures from equilibrium in the form of asymmetric features in the phase space density of …

  11. The 3D Galactocentric Velocities of Kepler Stars: Marginalizing Over Missing Radial Velocities

    Publication
    Precise Gaia measurements of positions, parallaxes, and proper motions provide an opportunity to calculate 3D positions and 2D velocities (i.e., 5D phase-space) of Milky Way stars …

  12. Constraining the Planet Occurrence Rate around Halo Stars of Potentially Extragalactic Origin

    Publication
    The search for planets orbiting other stars has recently expanded to include stars from galaxies outside the Milky Way. With the TESS and Gaia surveys, photometric and kinematic …

  13. Constraining the length and pattern speed of the Milky Way bar from direct orbit integration of APOGEE and Gaia data

    Publication
    The dynamics of the inner Galaxy contain crucial clues for untangling the evolutionary history of the Milky Way. However, the inner Galaxy's gravitational potential is poorly constrained …

  14. On the Hunt for the Origins of the Orphan--Chenab Stream: Detailed Element Abundances with APOGEE and Gaia

    Publication
    Stellar streams in the Galactic halo are useful probes of the assembly of galaxies like the Milky Way. Many tidal stellar streams that have been found in recent …

  15. Mapping Dark Matter with Extragalactic Stellar Streams: the Case of Centaurus A

    Publication
    In the coming decade, thousands of stellar streams will be observed in the halos of external galaxies. What fundamental discoveries will we make about dark matter from these …

  16. Implications of the Milky Way travel velocity for dynamical mass estimates of the Local Group

    Publication
    The total mass of the Local Group (LG) is a fundamental quantity that enables interpreting the orbits of its constituent galaxies and placing the LG in a cosmological …

  17. Snails across Scales: Local and Global Phase-mixing Structures as Probes of the Past and Future Milky Way

    Publication
    Signatures of vertical disequilibrium have been observed across the Milky Way's (MW's) disk. These signatures manifest locally as unmixed phase spirals in z–vz space ("snails …

  18. Stellar Abundance Maps of the Milky Way Disk

    Publication
    To understand the formation of the Milky Way's prominent bar it is important to know whether stars in the bar differ in the chemical element composition of …

  19. The Homogeneity of the Star-forming Environment of the Milky Way Disk over Time

    Publication
    Stellar abundances and ages afford the means to link chemical enrichment to galactic formation. In the Milky Way, individual element abundances show tight correlations with age, which vary …

  20. APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites

    Publication
    The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey has obtained high-resolution spectra for thousands of red giant stars distributed among the massive satellite galaxies …

  21. The Clustering of Orbital Poles Induced by the LMC: Hints for the Origin of Planes of Satellites

    Publication
    A significant fraction of Milky Way (MW) satellites exhibit phase-space properties consistent with a coherent orbital plane. Using tailored N-body simulations of a spherical MW halo …

  22. Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey

    Publication
    The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemodynamical mapping of …

  23. Quantifying the Impact of the Large Magellanic Cloud on the Structure of the Milky Way's Dark Matter Halo Using Basis Function Expansions

    Publication
    Indications of disequilibrium throughout the Milky Way (MW) highlight the need for compact, flexible, non-parametric descriptions of phase–space distributions of galaxies. We present a new representation …

  24. Age-dating Red Giant Stars Associated with Galactic Disk and Halo Substructures

    Publication
    The vast majority of Milky Way stellar halo stars were likely accreted from a small number (≲3) of relatively large dwarf galaxy accretion events. However, the timing of …

  25. Age-dating Red Giant Stars Associated with Galactic Disk and Halo Substructures

    Publication
    The vast majority of Milky Way stellar halo stars were likely accreted from a small number (≲3) of relatively large dwarf galaxy accretion events. However, the timing of …

  26. Chemodynamically Characterizing the Jhelum Stellar Stream with APOGEE-2

    Publication
    We present the kinematic and chemical profiles of red giant stars observed by the APOGEE-2 survey in the direction of the Jhelum stellar stream, a Milky Way …

  27. A Larger Extent for the Ophiuchus Stream

    Publication
    stream membership probabilities, resulting in the detection of more than 200 likely members. These data show the stream extends to more than three times the length shown in …

  28. Close Binary Companions to APOGEE DR16 Stars: 20,000 Binary-star Systems Across the Color–Magnitude Diagram

    Publication
    Many problems in contemporary astrophysics---from understanding the formation of black holes to untangling the chemical evolution of galaxies---rely on knowledge about binary stars. This, in turn …

  29. Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo

    Publication

  30. Kinematics of the Palomar 5 stellar stream from RR Lyrae stars

    Publication

  31. Variations in the width, density, and direction of the Palomar 5 tidal tails

    Publication

  32. Multiple retrograde substructures in the Galactic halo: A shattered view of Galactic history

    Publication

  33. Applying Liouville's Theorem to Gaia Data

    Publication
    The Milky Way is filled with the tidally-disrupted remnants of globular clusters and dwarf galaxies. Determining the properties of these objects -- in particular, initial masses and density …

  34. Applying Liouville's Theorem to Gaia Data

    Publication

  35. Multiple components of the Jhelum stellar stream

    Publication

  36. Binary Companions of Evolved Stars in APOGEE DR14: Search Method and Catalog of ∼5000 Companions

    Publication
    Multi-epoch radial velocity measurements of stars can be used to identify stellar, sub-stellar, and planetary-mass companions. Even a small number of observation epochs can be …