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| Andrew N. Youdin | |
|---|---|
| Name | Andrew N. Youdin |
| Nationality | American |
| Fields | Astrophysics, Astronomy, Planetary Science |
| Workplaces | University of California, Los Angeles; University of Michigan; Princeton University |
| Alma mater | Massachusetts Institute of Technology; Harvard University |
| Known for | Planetesimal formation; disk instability; streaming instability analyses |
Andrew N. Youdin is an American astrophysicist noted for theoretical and computational work on planet formation, protoplanetary disks, and the dynamics of solids in gaseous disks. His research integrates analytic theory with numerical simulations and has influenced studies at institutions such as the California Institute of Technology, Harvard University, and Princeton University. Youdin's publications and collaborations connect to broader research programs at organizations including the National Aeronautics and Space Administration, the National Science Foundation, and observational efforts at facilities like the Atacama Large Millimeter/submillimeter Array.
Born in the late 20th century, Youdin completed undergraduate and graduate studies at leading institutions that fostered interdisciplinary links between astronomy, physics, and applied mathematics. He earned degrees from the Massachusetts Institute of Technology and later pursued doctoral research guided by advisors with ties to the Harvard–Smithsonian Center for Astrophysics and the Princeton University Observatory. During his doctoral and postdoctoral stages he interacted with research groups at the Space Telescope Science Institute, the Jet Propulsion Laboratory, and the Max Planck Institute for Astronomy, forming collaborations that bridged theoretical modeling and observational constraints from missions such as Kepler and facilities like the Very Large Telescope.
Youdin held faculty and research positions at universities and national centers where he developed models of dust-gas interaction, aerodynamical coupling, and instabilities in protoplanetary environments. His appointments included roles at the University of Michigan, the University of California, Los Angeles, and visiting fellowships at institutions such as the Institute for Advanced Study and the Kavli Institute for Theoretical Physics. He worked with colleagues from the Carnegie Institution for Science, the Smithsonian Astrophysical Observatory, and international teams at the European Southern Observatory to place theoretical predictions alongside observations by the Submillimeter Array and the Gemini Observatory.
Youdin's computational efforts utilized codes and methodologies developed in collaboration with groups at the National Center for Supercomputing Applications and computing resources from the XSEDE program. He co-authored papers with researchers affiliated with the University of Cambridge, the University of Colorado Boulder, and the University of Arizona, contributing to community tools and review articles cited by teams working on ALMA surveys, Transiting Exoplanet Survey Satellite science, and models inspired by data from the Hubble Space Telescope.
Youdin is best known for advancing theories of planetesimal formation through analyses of disk instabilities and particle-gas interactions. He developed analytic treatments and numerical experiments related to the streaming instability, building on earlier frameworks by researchers at the Max Planck Institute for Extraterrestrial Physics and the California Institute of Technology. These studies addressed how solids concentrate in turbulent flows, influencing models that link dust coagulation, radial drift, and gravitational collapse in environments probed by observers at ALMA and theorists at the Institute of Astronomy, Cambridge.
He explored the thresholds for gravitational collapse in particle-rich regions of protoplanetary disks, connecting to concepts from the Goldreich–Ward instability and extending work from groups at the University of Chicago and the Southwest Research Institute. Youdin's formulations clarified the role of aerodynamic drag laws, stopping times, and particle size distributions in promoting localized overdensities capable of forming kilometer-scale bodies, a process relevant to studies of the Kuiper Belt and the asteroid belt. His investigations intersected with models of disk turbulence driven by the magnetorotational instability and hydrodynamic instabilities examined by theorists at the University of California, Berkeley and the Max Planck Institute for Astrophysics.
Youdin also contributed to literature on pebble accretion, collisional growth barriers, and migration of solids, engaging with the theoretical traditions of groups at the Swiss Federal Institute of Technology Zurich and the University of Toronto. His work has been cited in models that interpret exoplanet demographics from surveys such as Kepler and analyses performed by teams at the Space Telescope Science Institute.
Youdin received recognition from professional societies and funding agencies that support planetary science and astrophysics. Honors included early-career fellowships and grant awards from the National Science Foundation and research fellowships affiliated with the Simons Foundation and university-level distinguished research programs. His publications earned citations and invited review chapters for volumes of the Annual Review of Astronomy and Astrophysics and conference contributions at meetings organized by the American Astronomical Society and the Division for Planetary Sciences of the American Astronomical Society.
He was invited to present keynote and plenary talks at international symposia sponsored by the European Planetary Science Congress, the International Astronomical Union, and workshops hosted by the Max Planck Society and the Royal Astronomical Society.
Youdin balanced a research career with mentoring graduate students and postdoctoral researchers who went on to roles at institutions including the California Institute of Technology, the University of Cambridge, and the Carnegie Observatories. His legacy is evident in the adoption of streaming-instability-based pathways to planetesimal formation within curricula at departments such as the University of Arizona and in numerical toolchains used by groups at the Princeton Center for Theoretical Science. Colleagues at the University of Michigan, the University of California, Los Angeles, and international centers remember his contributions to collaborative projects that connected theory with observations from platforms like ALMA and Hubble Space Telescope programs.
Category:American astrophysicists Category:Planetary scientists