Adrian M. Price-Whelan
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View article: The dark matter wake of a galactic bar revealed by multichannel singular spectral analysis
The dark matter wake of a galactic bar revealed by multichannel singular spectral analysis Open
The Milky Way is known to contain a stellar bar, as are a significant fraction of disc galaxies across the universe. Our understanding of bar evolution, both theoretically and through analysis of simulations indicates that bars both grow i…
View article: A simulation-based inference approach to the dynamics of the MW–LMC system - validation
A simulation-based inference approach to the dynamics of the MW–LMC system - validation Open
The infall of the LMC into the Milky Way (MW) has generated dynamical disequilibrium throughout the MW. The interaction has displaced the MW’s centre of mass, manifesting as an apparent ‘reflex motion’ in velocities of outer halo stars. Of…
View article: OTI on FIRE: Testing the Efficacy of Orbital Torus Imaging to Recover the Galactic Potential
OTI on FIRE: Testing the Efficacy of Orbital Torus Imaging to Recover the Galactic Potential Open
Orbital Torus Imaging (OTI) is a dynamical inference method for determining the Milky Way’s gravitational potential using stellar survey data. OTI uses gradients in stellar astrophysical quantities, such as element abundances, as functions…
View article: <tt>paired</tt>: A Statistical Framework for Detecting Stellar Binarity with Gaia RVs. I. Sensitivity to Unresolved Binaries
paired: A Statistical Framework for Detecting Stellar Binarity with Gaia RVs. I. Sensitivity to Unresolved Binaries Open
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 targeted exoplanet transit survey stars presents an op…
View article: The Milky Way - Large Magellanic Cloud Interaction with Simulation Based Inference
The Milky Way - Large Magellanic Cloud Interaction with Simulation Based Inference Open
The infall of the Large Magellanic Cloud (LMC) into the Milky Way (MW) has displaced the MW's centre of mass, manifesting as an observed reflex motion in the velocities of outer halo stars. We use a Simulation Based Inference framework to …
View article: Measurement of Dark Matter Substructure from the Kinematics of the GD-1 Stellar Stream
Measurement of Dark Matter Substructure from the Kinematics of the GD-1 Stellar Stream Open
Stellar streams are sensitive tracers of low-mass dark matter subhalos and provide a means to test the Cold Dark Matter (CDM) paradigm on small scales. In this work, we connect the intrinsic velocity dispersion of the GD-1 stream to the nu…
View article: The Orbital Eccentricities of Planets in the Kinematic Thin and Thick Galactic Disks
The Orbital Eccentricities of Planets in the Kinematic Thin and Thick Galactic Disks Open
The orbital eccentricity distribution of exoplanets is shaped by a combination of dynamical processes, reflecting both formation conditions and long-term evolution. Probing the orbital dynamics of planets in the kinematic thin and thick Ga…
View article: Semianalytic Modeling of Dark Matter Subhalo Encounters with Thin Stellar Streams: Statistical Predictions for GD-1-like Streams in Cold Dark Matter
Semianalytic Modeling of Dark Matter Subhalo Encounters with Thin Stellar Streams: Statistical Predictions for GD-1-like Streams in Cold Dark Matter Open
Stellar streams from disrupted globular clusters are dynamically cold structures that are sensitive to perturbations from dark matter subhalos, allowing them in principle to trace the dark matter substructure in the Milky Way. We model, wi…
View article: Tracing Red Giant Members of the Globular Cluster Palomar 5 with APOGEE and Gaia
Tracing Red Giant Members of the Globular Cluster Palomar 5 with APOGEE and Gaia Open
The globular cluster Palomar 5 (Pal 5) is in the process of being tidally shredded as it orbits the Milky Way. Its core is currently at a heliocentric distance of ∼21 kpc, near apogalacticon (∼18 kpc), and it reaches ∼5–7 kpc at perigalact…
View article: Delayed and Displaced: The Impact of Binary Interactions on Core-collapse SN Feedback
Delayed and Displaced: The Impact of Binary Interactions on Core-collapse SN Feedback Open
Core-collapse supernova feedback models in hydrodynamical simulations typically assume that all stars evolve as single stars. However, the majority of massive stars are formed in binaries and multiple systems, where interactions with a com…
View article: Counterculture Stars: Slow and Retrograde Stars with Low-alpha Disk Abundances
Counterculture Stars: Slow and Retrograde Stars with Low-alpha Disk Abundances Open
The Milky Way is home to a thin disk that can be defined via kinematics and/or elemental abundances. The elemental abundance-defined thin disk, also called the low-alpha disk, is generally thought to comprise stars on planar, circular orbi…
View article: Tidal Debris Candidates from the <i>ω</i> Centauri Accretion Event and Its Role Building Up the Milky Way Halo
Tidal Debris Candidates from the <i>ω</i> Centauri Accretion Event and Its Role Building Up the Milky Way Halo Open
We identify stellar tidal debris from the ω Centauri ( ω Cen) system among field stars in the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey via chemical tagging using a neural network trained on APOGEE observations…
View article: A Simulation Based Inference Approach to the Dynamics of the MW-LMC System -- Validation
A Simulation Based Inference Approach to the Dynamics of the MW-LMC System -- Validation Open
The infall of the LMC into the Milky Way (MW) has generated dynamical disequilibrium throughout the MW. The interaction has displaced the MW's centre of mass, manifesting as an apparent 'reflex motion' in velocities of outer halo stars. Of…
View article: Inferring the Density and Membership of Stellar Streams with Flexible Models: The GD-1 Stream in Gaia Data Release 3
Inferring the Density and Membership of Stellar Streams with Flexible Models: The GD-1 Stream in Gaia Data Release 3 Open
Stellar streams provide one of the most promising avenues for constraining the global mass distribution of the Milky Way and the nature of dark matter (DM). The stream stars’ kinematic “track” enables inference of large-scale properties of…
View article: Stellar ejection velocities from the binary supernova scenario: A comparison across population synthesis codes
Stellar ejection velocities from the binary supernova scenario: A comparison across population synthesis codes Open
The vast majority of binary systems are disrupted at the moment of the first supernova, resulting in an unbound compact object and companion star. These ejected companion stars contribute to the observed population of runaway stars. Theref…
View article: Iron Snails: Nonequilibrium Dynamics and Spiral Abundance Patterns
Iron Snails: Nonequilibrium Dynamics and Spiral Abundance Patterns Open
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 mix toward a new steady state; in so doing,…
View article: Counterculture Stars: Slow and Retrograde Stars with Low-Alpha Disk Abundances
Counterculture Stars: Slow and Retrograde Stars with Low-Alpha Disk Abundances Open
The Milky Way is home to a thin disk that can be defined via kinematics and/or elemental abundances. The elemental abundance-defined thin disk, also called the low-alpha disk, is generally thought to be comprised of stars on planar, circul…
View article: Lux: A Generative, Multioutput, Latent-variable Model for Astronomical Data with Noisy Labels
Lux: A Generative, Multioutput, Latent-variable Model for Astronomical Data with Noisy Labels Open
The large volume of spectroscopic data available now and from near-future surveys will enable high-dimensional measurements of stellar parameters and properties. Current methods for determining stellar labels from spectra use physics-drive…
View article: OTI on FIRE: Testing the Efficacy of Orbital Torus Imaging to Recover the Galactic Potential
OTI on FIRE: Testing the Efficacy of Orbital Torus Imaging to Recover the Galactic Potential Open
Orbital Torus Imaging (OTI) is a dynamical inference method for determining the Milky Way's gravitational potential using stellar survey data. OTI uses gradients in stellar astrophysical quantities, such as element abundances, as functions…
View article: Many Elements Matter: Detailed Abundance Patterns Reveal Star Formation and Enrichment Differences among Milky Way Structural Components
Many Elements Matter: Detailed Abundance Patterns Reveal Star Formation and Enrichment Differences among Milky Way Structural Components Open
Many nucleosynthetic channels create the elements, but two-parameter models characterized by α and Fe nonetheless predict stellar abundances in the Galactic disk to accuracies of 0.02–0.05 dex for most measured elements, near the level of …
View article: An Equilibrium Model of the Galaxy Determined by Element Abundance Gradients
An Equilibrium Model of the Galaxy Determined by Element Abundance Gradients Open
We present a method to determine the gravitational potential of the Milky Way from measurements of the locations, velocities, and element abundances of stars in the Galactic disk. The method relies on the assumption that the Galaxy is axis…
View article: <tt>StreamSculptor:</tt> Hamiltonian Perturbation Theory for Stellar Streams in Flexible Potentials with Differentiable Simulations
StreamSculptor: Hamiltonian Perturbation Theory for Stellar Streams in Flexible Potentials with Differentiable Simulations Open
Stellar streams are one of the most promising tracers of low-mass dark-matter subhalos. Existing frameworks for modeling stream perturbations rely on restrictive assumptions for the Milky Way potential (e.g., static, axisymmetric) or are c…
View article: Evidence of Truly Young High-α Dwarf Stars
Evidence of Truly Young High-α Dwarf Stars Open
The existence of high- α stars with inferred ages <6 Gyr has been confirmed recently with large spectroscopic and photometric surveys. However, stellar mergers or binary interactions can induce properties associated with young ages, such a…
View article: Stream Members Only: Data-driven Characterization of Stellar Streams with Mixture Density Networks
Stream Members Only: Data-driven Characterization of Stellar Streams with Mixture Density Networks Open
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 surface density constrains galactic substructure. A precise c…
View article: Segue 2 Recently Collided with the Cetus-Palca Stream: New Opportunities to Constrain Dark Matter in an Ultra-faint Dwarf
Segue 2 Recently Collided with the Cetus-Palca Stream: New Opportunities to Constrain Dark Matter in an Ultra-faint Dwarf Open
Stellar streams in the Milky Way are promising detectors of low-mass dark matter (DM) subhalos predicted by ΛCDM. Passing subhalos induce perturbations in streams that indicate the presence of the subhalos. Understanding how known DM-domin…
View article: Data-driven Dynamics with Orbital Torus Imaging: A Flexible Model of the Vertical Phase Space of the Galaxy
Data-driven Dynamics with Orbital Torus Imaging: A Flexible Model of the Vertical Phase Space of the Galaxy Open
The vertical kinematics of stars near the Sun can be used to measure the total mass distribution near the Galactic disk and to study out-of-equilibrium dynamics. With contemporary stellar surveys, the tracers of vertical dynamics are so nu…
View article: cogsworth: A Gala of COSMIC Proportions Combining Binary Stellar Evolution and Galactic Dynamics
cogsworth: A Gala of COSMIC Proportions Combining Binary Stellar Evolution and Galactic Dynamics Open
We present cogsworth , an open-source Python tool for producing self-consistent population synthesis and galactic dynamics simulations. cogsworth allows users to (1) sample a population of binaries and star formation history, (2) perform r…
View article: LMC Calls, Milky Way Halo Answers: Disentangling the Effects of the MW–LMC Interaction on Stellar Stream Populations
LMC Calls, Milky Way Halo Answers: Disentangling the Effects of the MW–LMC Interaction on Stellar Stream Populations Open
The infall of the LMC into the Milky Way (MW) has dynamical implications throughout the MW’s dark matter halo. We study the impact of this merger on the statistical properties of populations of simulated stellar streams. Specifically, we i…