You are here

2021 Virtual DDA Meeting Schedule

2021 Virtual 52nd Annual Meeting of the DDA

Q&A/Discussion Webinar Schedule

See the main meeting website for registration information:

The abstracts are available via NASA/ADS and in a Google Doc here: DDA-52-Abstract-Book

Many of the pre-recorded presentations and PDF posters are now linked below for public viewing! (All presentations are available for viewing on the registrant-only DDA meeting website.) 

All times below are EDT (UTC-4)



Monday, May 17


11:30-12:00 EDT

virtual coffee/socializing

12:00-12:05 EDT Ruth Murray-Clay (SOC Chair, DDA Vice-Chair) Welcome/Announcements
12:05-12:30 EDT

Evolution and Migration in Exoplanet Systems: Hot and Warm Jupiters (Session 100)

Chair: Sarah Millholland

  Rebekah Dawson Pennsylvania State University Precise Characterization of a 2:1 Resonant Pair: The Warm Jupiter TOI-216c and Eccentric Warm Neptune TOI-216b -- link to recording
  Jonathan Jackson Pennsylvania State University Observable Predictions from Perturber-coupled High-eccentricity Migration of Warm Jupiters -- link to recording
  Mor Rozner Technion – Israel Institute of Technology Origin Of Hot & Warm Jupiters From Enhanced High Eccentricity Migration -- link to recording
  Malena Rice Yale University Revisiting the Dynamics of the HD 80606 Planetary System
  Kassandra Anderson Princeton University On a Possible Solution to the Tidal Realignment Problem for Hot Jupiters -- link to recording
12:30-12:50 EDT

Evolution and Migration in Exoplanet Systems: Sub-Neptunes and Super-Earths (Session 101)

Chair: Rebekah Dawson

  Sam Hadden Harvard-Smithsonian Center for Astrophysics Inferring Migration Histories of Resonant Planets
  Mariah MacDonald Pennsylvania State University Constraining the formation of super-Earths via resonances -- link to recording
  Juliette Becker Caltech Forming Ultra-Short-Period Planets Via Disk Migration in a Sub-Keplerian Disk -- link to recording
  Isabel Angelo University of California, Los Angeles Origin of Kepler-1656b's Extreme Eccentricity -- link to recording
13:00-14:30 EDT

Plenary Session (Session 102)

Invited Seminar

Chair: Smadar Naoz

  Sherard Robbins Visceral Change Power and Privilege
14:30-15:00 EDT


15:00-15:30 EDT

Advances in Simulations of Exoplanet Evolution (Session 103)

Chair: Daniel Tamayo

  Daniel Scheeres University of Colorado, Boulder Tracking the Minimum Energy Function of Disassociated N-Body Systems
  David Hernandez Center for Astrophysics | Harvard & Smithsonian Are long term N-body simulations reliable?
  Shirui Peng California Institute of Technology Interactions Among Non-Interacting Particles in Planet Formation Simulations -- link to recording
  Gongjie Li Georgia Institute of Technology GRIT: a simulation package for GRavitationally InteracTing Rigid-Bodies -- link to recording
  Steven Kreyche University of Idaho Exploring tidal obliquity variations with SMERCURY-T -- PDF Poster
  Jackson Barnes Michigan State University The Role of Gravitational Collapse in Planetesimal Formation
15:30-15:55 EDT

Dynamical Stability in Exoplanet Systems (Session 104)

Chair: Dimitri Veras

  Daniel Tamayo Princeton University On the mechanisms for instabilities in compact multiplanet systems -- link to recording
  Daniel Jones Brigham Young University Constraining the Physical and Orbital Parameters of Kepler Systems using Stability Criteria
  Sacha Gavino Niels Bohr Institute Anomalously long-lived compact configurations in three-planet systems -- link to recording
  Aleksandr Mylläri St. George's University Testing the three-body stability limit at very long time
  Samuel Yee Princeton University How Close are Compact Multi-Planet Systems to the Stability Limit?
  Elizabeth Ellithorpe University of Oklahoma Possible Origins of Planetary Spin-Orbit Misalignment in Binary Systems -- link to recording
15:55-16:00 EDT short break
16:00-16:15 EDT

Dynamics of Dark Matter (Session 105)

Chair: Elena D'Onghia

  Jorge Moreno Pomona College (Invited) Dark matter free galaxies in LCDM
  Sioree Ansar Indian Institute of Astrophysics, Bangalore, Center for Computational Astrophysics, Flatiron Institute Determining Dark Matter Halo Properties using Visible Matter Observations of galaxies: A novel technique applied to high spinning halo of UGC5288
  Hayden Foote University of Arizona Studying Dynamical Friction on the Large Magellanic Cloud as a Dark Matter Probe
16:15-16:40 EDT

Impacts, Collisions, and Disruptions (Session 106)

Chair: Matija Cuk

  Konstantin Batygin California Institute of Technology Formation of Galilean Satellites in a Decretion Disk -- link to recording
  Sierra Ferguson Arizona State University Examination of elliptical craters on Saturn's moons Tethys and Dione constrain their ages and origin
  Gavin Brown University of Colorado Boulder Loss of Energy and Angular Momentum in Disrupting N-body Systems
  Matthew Clement Carnegie Institution of Washington Dynamical avenues for Mercury's enigmatic origin -- link to recording
  Oscar Fuentes-Munoz University of Colorado Boulder NEO collision and close flyby probabilities using semi-analytical long-term propagation -- link to recording
16:40-17:00 EDT

end of day virtual socializing


Tuesday, May 18


11:30-12:00 EDT

virtual coffee/socializing

12:00-12:35 EDT

Dynamics Leading to Gravitational Waves (Session 200)

Chair: Rosemary Wyse

  Carl Rodriguez Carnegie Mellon University (Invited) Dynamical Formation of LIGO's Binary Black Hole Mergers -- link to recording
  Yubo Su Cornell University Spin-Orbit Misalignments in Tertiary-Induced Black-Hole Binary Mergers: Theoretical Analysis -- link to recording
  Michelle Vick CIERA, Northwestern University The Impact of Tidal Dissipation on the Eccentric Onset of Common Envelope Phases -- link to recording
  Tatsuya Akiba University of Colorado Boulder (Duncombe Student Research Prize Winner) The Beginning of an END -- link to recording
  Smadar Naoz University of California, Los Angeles Gravitational Wave Sources at the Heart of Galaxies -- link to recording
  Huiyi Wang UCLA Gravitational-Wave Signatures from Compact Object Binaries in the Galactic Center
12:35-12:50 EDT

Clusters (Session 201)

Chair: Rosemary Wyse

  Aleksey Generozov University of Colorado Origin of the S star cluster
  Laura Watkins AURA for ESA, ESA Office, Space Telescope Science Institute Energy Equipartition in Galactic Globular Clusters -- link to recording
  Vaclav Pavlik Indiana University Star cluster evolution towards energy equipartition
12:50-13:00 EDT short break
13:00-14:00 EDT

Plenary Session (Session 202)

Townhall Discussion about DEI Moderated by Sherard Robbins

Chair: Ruth Murray-Clay

14:00-14:05 EDT

short break

14:05-14:25 EDT

Special Session

The Dynamics of Building a Dynamics Community: Strategies to make graduate programs more inclusive (Session 203) 

Chair: Kat Volk

  Smadar Naoz University of California, Los Angeles DEI efforts at UCLA physics and astronomy department
  Michael Petersen University of Edinburgh The Royal Observatory Edinburgh Institute for Astronomy's experience building an Diversity, Equity, and Inclusion team
14:25-15:00 EDT

Evolution of Stellar Multiples (Session 204)

Chair: Smadar Naoz

  Tjarda Boekholt University of Oxford Gargantuan chaotic gravitational three-body systems and their
irreversibility to the Planck length
  Eliot Halley Vrijmoet RECONS/Georgia State University Orbital Architectures of M Dwarf Systems -- PDF Poster
  John Zanazzi University of Toronto Tidal Circularization of Binaries by Resonance Locking -- link to recording
  Logan Pearce University of Arizona An investigation of chaotic planetary dynamics induced by the wide stellar binary companion to Boyajian’s Star
  Marguerite Epstein-Martin California Institute of Technology Exciting Stellar Obliquities in Triple Star Systems
  Silvia Toonen University of Amsterdam (Invited) The evolution of stellar triples
15:00-15:30 EDT


15:30-15:55 EDT

Tides and Interiors (Session 205)

Chair: Marina Brozovic

  Matija Cuk SETI Institute Recent Orbital Evolution of the Inner Moons of Saturn -- link to recording
  Jean-Luc Margot University of California, Los Angeles Measurements of the spin axis precession and length-of-day variations of Venus -- link to recording
  Alyssa Rhoden Southwest Research Institute The effects of bombardment on the thermal-orbital evolution of icy satellites
  Matthew Walker Planetary Science Institute Tidal Heating of Ice Shells with Variable Eccentricity -- link to recording
  Joseph A'Hearn University of Idaho Ice Giant Ring Seismology
15:55-16:00 EDT short break
16:00-16:25 EDT

Physical Structures of Exoplanets, Accretion, and Impacts (Session 206)

Chair: Christopher O'Connor

  Spencer Wallace University of Washington, Seattle Understanding Planetesimal Accretion at Short Orbital Periods -- link to recording
  Jiayin Dong Penn State (Duncombe Student Research Prize Winner) Boundary Layer Circumplanetary Accretion: How Fast Could an Unmagnetized Planet Spin Up Through Its Disk?
  Nader Haghighipour Planetary Science Institute Accurate Calculations of Planetesimal-Envelope Interactions in the Core Accretion Model
  Renata Frelikh UC Santa Cruz Clues in the Giant Exoplanet Eccentricity Distribution Point to Planet-Planet Impacts -- link to recording
  Santiago Torres UCLA Raining Rocks in Exo-Worlds
16:25-17:00 EDT

end of day virtual socializing


Wednesday, May 19


11:30-12:00 EDT

virtual coffee/socializing

12:00-12:45 EDT

Plenary Session (Session 300)

Vera Rubin Early Career Prize Lecture

Chair: Ruth Murray-Clay

  Jacqueline Faherty American Museum of Natural History Tales in Stellar Motion
12:45-12:50 EDT

short break

12:50-13:20 EDT

Special Session
How Gaia reveals the Galaxy’s secrets: results local to the Sun (Session 301)

Chair: Robyn Sanderson

  Ruth Angus AMNH & Flatiron (Invited) Kinematic ages for cool stars -- link to recording
  J. Davy Kirkpatrick Caltech.IPAC (Invited) Using Gaia Astrometry to Anchor Parallaxes for Nearby Brown Dwarfs
  Raquel Martinez University of Texas, Austin (Invited) Leveraging Large-Sky Surveys in the Gaia Era to Reveal the Nature of Wide Substellar Companions -- link to recording
  Daniella Bardalez Gagliuffi American Museum of Natural History (Invited) System Architectures as Fossils of Brown Dwarf and Giant Planet Formation -- link to recording
  Zephyr Penoyre University of Cambridge Identifying Unresolved Binaries from Astrometric Error -- link to recording
  Melinda Soares-Furtado University of Wisconsin-Madison (Invited) Using Gaia to Search for Planetary Engulfment Sites
  Wilma Trick Max Planck Institute for Astrophysics (Invited) The Galactic bar's outer Lindblad resonance (OLR) in Gaia's action-angle space
13:20-13:25 EDT

short break

13:25-13:55 EDT

Special Session
How Gaia reveals the Galaxy’s secrets: from local to galactic scale (Session 302)

Chair: Sukanya Chakrabarti

  Aneesh Naik University of Nottingham The Local Acceleration Field: Insights from Deep Learning -- link to recording
  Catherine Zucker Harvard University (Invited) Probing the Structure and Dynamics of our Local Interstellar Medium with Gaia -- link to recording
  Cameren Swiggum University of Wisconsin Feedback-induced Radial Expansion at the Core of the Orion Complex -- link to recording
  Keith Hawkins University of Texas, Austin (Invited) Galactic Archaeology: Understanding our Milky Way through Chemodynamics
  Adrian Price-Whelan Flatiron Institute (Invited) Orbital Torus Imaging: Using Element Abundances to Map Orbits and Mass in the Milky Way -- link to recording
  Tommaso Marchetti European Southern Observatory (Invited) Searching for unbound stars in Gaia EDR3 -- link to recording
13:55-14:00 EDT

short break

14:00-14:25 EDT

Population-Level Exoplanet Demographics (Session 303)

Chair: Alexander Stephan

  Thea Faridani UCLA Hiding Planets Near and Far: Predicting Hidden Companions for Known Planetary Systems
  Emily Safsten The Pennsylvania State University Nature versus Nurture: Using a Bayesian framework to study correlations between planetary properties and stellar ages
  Phoebe Sandhaus Pennsylvania State University Simulating the Effects of Outer Giant Planets on Inner Super-Earths with In Situ Formation Models
  Sarah Millholland Princeton University Evidence for a Non-Dichotomous Solution to the Kepler Dichotomy -- link to recording
  Christopher Spalding Princeton University Metallicity matters in the tidal damping of stellar obliquities -- link to recording
14:25-14:30 EDT

short break

14:30-14:55 EDT

Orbital Resonance in Multi-Planet Systems (Session 304)

Chair: Sam Hadden

  Nora Bailey University of Chicago Planetary Period Ratio Sculpting Near Second-Order Mean-Motion Resonances -- link to recording
  Max Goldberg California Institute of Technology (Duncombe Student Research Prize Winner) A Tidal Origin for a 3-body Resonance in Kepler-221
  Jack Lissauer NASA Ames Research Center Three-Body Resonances Among Kepler Planets
  Darin Ragozzine Brigham Young University Towards a Photodynamical Analysis of all Kepler Multi-Transiting Systems -- link to recording
  Drew Weisserman University of Michigan A Dynamical Analysis of the Kepler-80 System of Six Transiting Planets
14:55-15:30 EDT


15:30-15:55 EDT

The Hill Sphere, Trojans, Horseshoe Orbits, and Resonances (Session 305)

Chair: Althea Moorhead

  Kat Volk University of Arizona Mapping Neptune’s resonances into the distant solar system -- link to recording
  Conor Benson University of Colorado Resonant Tumbling YORP for Defunct Artificial Satellites -- link to recording
  Jose Castro-Cisneros University of Arizona Near-Earth Asteroid Kamo`oalewa as Lunar Ejecta
  Renu Malhotra University of Arizona What really goes on in the chaotic zones of the planets, from Earth to Neptune
  Travis Yeager Lawrence Livermore National Lab The Lifetimes of Earth Trojan Asteroids and Tadpole Orbits
15:55-16:00 EDT

short break

16:00-17:00 EDT

Mentoring Event

Chair: Juliette Becker

17:00-17:30 EDT

Student Discussion with Rubin Prize Speaker


17:00-17:30 EDT

end of day virtual socializing


Thursday, May 20


11:30-12:15 EDT

Plenary Session (Session 400)

Dirk Brouwer Career Prize Lecture

Chair: Kat Volk

  Lennart Lindegren Lund University Models and Methods in Optical Astrometry
12:15-12:20 EDT

short break

12:20-12:50 EDT

Special Session
How Gaia Reveals the Galaxy’s Secrets: Results on the Galactic Scale Part 1 (Session 401)

Chair: Melinda Soares-Furtado

  Sukanya Chakrabarti Rochester Institute of Technology (Invited) Fundamental Galactic parameters from direct acceleration measurements -- link to recording
  Elena D'Onghia University of Wisconsin, Madison (Invited) Footprints of the bar and spiral-arm resonances in the solar neighborhood from Gaia-EDR3
  Stacy McGaugh Case Western Reserve University The Imprint of Spiral Arms on the Galactic Rotation Curve -- link to recording
  Zhaozhou Li Shanghai Jiao Tong University A Novel Dynamical Modeling Method Based on the Data-driven Distribution Function
  Andres del Pino Molina Space Telescope Science Institute Machine Learning glasses for the eyes of Gaia: The Sagittarius Dwarf Spheroidal Galaxy in 6D. -- link to recording
  Ana Bonaca Harvard University (Invited) Reconstruction of the dark matter distribution in the Milky Way -- link to recording
13:00-13:30 EDT

Special Session
How Gaia Reveals the Galaxy’s Secrets: Results on the Galactic Scale Part 2 (Session 402)

Chair: Ana Bonaca

  Alis Deason Durham University (Invited) The Galactic Halo in the Gaia Era
  Michael Petersen University of Edinburgh Bringing Milky Way and Large Magellanic Cloud potentials to life to explain the Milky Way halo disequilibrium
  Carrie Filion The Johns Hopkins University Little Galaxy, Big Envelope: Blue Stars in the Outskirts of the Boötes I Ultra Faint Dwarf Galaxy
  Rachael Beaton Princeton University (Invited) Gaia Parallaxes and the ExtraGalctic Distance Scale -- link to recording
  Annie Robin Institut Utinam (Invited) A fully consistent dynamical model of the Milky Way facing Gaia data
13:30-14:00 EDT


14:00-14:25 EDT

Galactic Streams and Structures (Session 403)

Chair: Alis Deason

  Eric Mendelsohn Rensselaer Polytechnic Institute Estimate of the Mass and Radial Profile of the Orphan Stream’s Dwarf Galaxy Progenitor Using MilkyWay @ home
  Tjitske Starkenburg Northwestern University Debris at the low-mass end: predictions for stellar halos, streams and shells around the LMC and its siblings
  Thomas Donlon Rensselaer Polytechnic Institute A Trifurcated Sagittarius Stream in the South -- link to recording
  Arpit Arora University of Pennsylvania On the adiabaticity of action space clustering of tidal streams via potential modelling
  Scott Lucchini University of Wisconsin - Madison The Magellanic Stream: Implications of the Magellanic Corona and new Orbital Histories of the Clouds
14:25-14:45 EDT

Galactic Morphologies and Mergers (Session 404)

Chair: Adrian Price-Whelan

  Dhanesh Krishnarao Space Telescope Science Institute Finding the Ultra-Harmonic Resonance from Photometry Alone
  Nicolas Garavito-Camargo University of Arizona The clustering of orbital poles in the Milky Way’s halo induced by the Large Magellanic Cloud -- link to recording
  Katie Chamberlain University of Arizona Frequency and Dynamics of Dwarf Galaxy Pairs over Cosmic Time
14:45-14:50 EDT

short break

14:50-15:20 EDT

Populations of Small Bodies (Session 405)

Chair: Joseph Spitale

  Fred Adams University of Michigan Capture of Interstellar Objects by our Solar System -- link to recording
  Stanley Dermott University of Florida Dynamical evolution of the inner asteroid belt  -- link to recording
  Debora Pavela University of Belgrade, Faculty of Mathematics The Karma asteroid family: membership, age and evolution
  Althea Moorhead NASA Marshall Space Flight Center Fully debiased meteor radiants and speeds and their constraints on dynamical models -- link to recording
  Dan Li NSF's NOIRLab The random walk evolution of asteroid families -- PDF Poster
  Alex Meyer University of Colorado Boulder Modeling Fully Coupled Dynamics of Janus Binary Asteroid Mission Targets -- link to recording
15:20-15:45 EDT

Rings, Disks, and Migration (Session 406)

Chair: Joseph A'hearn

  Arcelia Hermosillo Ruiz University of California, Santa Cruz (Duncombe Student Research Prize Winner) The Impact of Stochastic Migration on Weak Resonances in The Kuiper Belt -- link to recording
  Matthew Hedman University of Idaho Recording history in planetary rings with density waves
  Glen Stewart University of Colorado Local Gravitational Instabilities Modeled as a Dynamical System
  Meredith MacGregor University of Colorado at Boulder (Invited) Gaps and Wings and Eccentricities - ALMA Observations Reveal the Dynamics of Nearby Debris Disks
  Daniel Sega University of Colorado, Boulder Interactions within Self-Gravity wakes and bending waves based on the Mimas 5:3 Bending wave -- link to recording
15:45-16:00 EDT break
16:00-17:00 EDT

Networking Event

Chair: Darin Ragozzine

17:00-17:30 EDT

end of day virtual socializing


Friday, May 21


11:30-12:00 EDT

virtual coffee/socializing

11:30-12:00 EDT

Student Discussion with Brouwer Prize Speaker


12:00-12:25 EDT

KBOs and Multiples (Session 501)

Chair: Darin Ragozzine

  Alexandre Correia University of Coimbra Evolution of the Pluto-Charon binary under tides
  Sricharan Balaji UC Santa Cruz Can the Kuiper Belt's 3:2 orbital distribution result from stability sculpting?
  Ian Matheson University of Arizona A measurement of the Kuiper Belt midplane from AI-classified objects
  Hunter Campbell University of Oklahoma Stability and Formation of Ultra-Wide Kuiper Belt Binaries -- link to recording
  Nathan Kaib University of Oklahoma Inferring the primordial Pluto-mass population of the Kuiper belt -- link to recording
12:25-12:30 EDT

short break

12:30-12:55 EDT

TNOs and Planet X (Session 502)

Chair: Matthew Clement

  Kalee Anderson University of Oklahoma Effects on the Inclination Distribution of the Detached Kuiper Belt by a Distant Planet
  Dallin Spencer Brigham Young University- Provo Investigating Non-Keplerian Effects in Trans-Neptunian Multiples -- link to recording
  Kevin Napier University of Michigan No Evidence for Orbital Clustering in the Extreme Trans-Neptunian Objects
  William Oldroyd Northern Arizona University Planet X Can Cause the Outer Solar System Perihelion Gap -- link to recording
  Mohamad Ali-Dib University of Montreal The rarity of very red TNOs in the scattered disk and high order resonances
12:55-13:00 EDT short break
13:00-14:00 EDT

DDA Members' Meeting
(open to attendees and all DDA members)

Chair: Kat Volk

14:00-14:15 EDT break
14:15-14:35 EDT

Protoplanetary Disk Physics and Young Exoplanets (Session 504)

Chair: Konstantin Batygin

  Sahl Rowther University of Warwick Hiding Signatures of Gravitational Instability in Protoplanetary Discs with Planets -- link to recording
  Zachary Murray Center for Astrophysics | Harvard and Smithsonian The Effects of Massive Protoplanetary Disks on Resonance Capture and Evolution
  Antranik Sefilian University of Cambridge Mind the gap: secular dynamics of self-gravitating debris disks -- link to recording
  Kundan Kadam University of Western Ontario Global model of magnetic wind-driven accretion in protoplanetary disks -- link to recording
14:35-14:50 EDT

Dynamics of Planets After the Main Sequence (Session 505)

Chair: Gongie Li

  Christopher O'Connor Cornell University Secular chaos in white-dwarf planetary systems
  Dimitri Veras University of Warwick The post-main-sequence fate of the HR 8799 planetary system -- link to recording
  Alexander Stephan OSU Throwing Giant Planets at White Dwarfs
14:50-15:00 EDT Closing Remarks/Announcements
15:00-16:00 EDT

end of meeting virtual socializing


Asynchronous Poster Presentations (Session 107)

Discussion via Slack

Available all week

Sethanne Howard USNO/retired Some spiral galaxies dominate their halos -- PDF Poster
Nihaal Zaveri University of California, Santa Cruz Pluto's Resonant Orbit Visualized in 4D -- PDF Poster
Konstantin Batygin California Institute of Technology P9-Driven Mixing Between the Inner Oort Cloud and the Scattered Disk -- PDF Poster
Antranik Sefilian University of Cambridge Potential softening and eccentricity dynamics in nearly Keplerian disks -- PDF Poster
Dimitri Veras University of Warwick Rocky debris pollution of single white dwarfs in systems with no planets
Rebekah Dawson Pennsylvania State University Obliquities of exoplanet host stars
Jiayin Dong Penn State In Situ versus Disk Migration Origins of Warm Jupiters: Prediction on Nearby Companions
Zhaozhou Li Shanghai Jiao Tong University The outer edges of the Milky Way halo from the motion of nearby galaxies
Jeffrey Sudol West Chester University On the prospect of detecting habitable trojan planets in the Kepler circumbinary planetary systems
Benjamin Proudfoot Brigham Young University Prolate vs Oblate: When Do Sectoral Gravitational Harmonics Matter?
Nader Haghighipour Planetary Science Institute No Resonance Capture is Exact