Overview: Page A This is a proposal to understand the internal structure and evolutionary histories of supernova progenitors. The Supernova Progenitor Internal Dynamics and Evolution Research (SPIDER) Network will consist of 4 principal institutions: UC Santa Barbara, Arizona State Univ. U. Colorado-Boulder, and U. Wisconsin-Madison that collectively comprise expertise in stellar structure and evolutionfrom the zero age main sequence to advanced burning stages, stellar pulsations, and direct numerical simulation of stellar convection,interior rotation, and magnetism. Initially most of the work will be performed via 4 Focused Efforts, each involving multiple institutions: angular momentum transport at the core - envelope boundary of massive main sequence stars, convection and wave transport in the envelopes of massive evolved stars, tests of angular momentum transport mechanisms through red giant asteroseismology, and the effects of rotation and magnetism on inwardly propagating carbon burning flames. These focused efforts will evolve over the course of the project and involve different combinations of the participating investigators, institutions and external collaborators. A combination of frequent small workshops, extended intercampus visits, and integrated management will link the team together. The major physics outcomes of this work will be 1D stellar models of supernova progenitors which are informed by 3D physics and testable by observations. This work will impact cosmology through improved understanding of supernova-based probes, gravitation research through improved estimates of the birth rates and properties of gravitational wave sources, and galactic evolution research through improved estimates for nucleosynthetic yields and post main sequence mass loss. Other major outcomes will include adaptation of the networks computational tools for use by the scientific community, exposure of graduate students and postdocs to an unusually broad research experience, and advances in subgrid modeling that may be applicable to other fields in science. Intellectual Merit : The team will integrate state of the art stellar computational fluid dynamics codes, stellar pulsation codes, and stellar structure and evolution codes in combination for the first time. Interleaving computational results with fundamental theory, and informed by observations, the team will study the effects of waves, meridional circulation, and magnetic torques on angular momentum transport, compositional mixing, and pulsations in evolved stars. The research will culminate in prescriptions for these 3D processes for use in 1D stellar structure and evolution codes. Broader Impacts : Supernovae are exciting to the public and are a focal point for teaching many different kinds of science. All 4 participating institutions have well established outreach and education venues that will be good platforms for a broad range of outreach activities by members of the SPIDER network, including public lectures and workshops, visits to K-12 classrooms, summer programs for students from underrepresented groups, and incorporation of research results and visualizations into both university general astronomy courses for nonscience majors and specialized courses for students in STEM fields. The project will train the next generation of scientists through graduate student and postdoc participation in every phase of the network activity.
|Effective start/end date||1/1/14 → 12/31/18|
- NASA: Goddard Space Flight Center: $324,241.00
main sequence stars
computational fluid dynamics
direct numerical simulation