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Travis Metcalfe (NCAR)

A TeraGrid Science Gateway for Kepler Asteroseismic Data. Travis Metcalfe (NCAR). Collaborators : Joergen Christensen-Dalsgaard, Orlagh Creevey, Matthew Woitaszek. Wampler’s screwdriver. Schematic pipeline. input global search local analysis output.

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Travis Metcalfe (NCAR)

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  1. A TeraGrid Science Gateway for Kepler Asteroseismic Data Travis Metcalfe (NCAR) Collaborators: Joergen Christensen-Dalsgaard, Orlagh Creevey, Matthew Woitaszek

  2. Wampler’s screwdriver

  3. Schematic pipeline input global search local analysis output nnl, Teff, L, R SVD LM M, Z, Y, a, t parallel GA pulsation frequencies and other constraints ASTEC + ADIPLS optimal parameters, other model output teragrid bluegene desktop workstation

  4. GA convergence 0.75 < Mstar< 1.75 0.002 < Zinit< 0.05 0.22 < Yinit < 0.32 1.0 <amlt< 3.0 50,000 CPU-hours/fit • Initial convergence driven by the crossover operator (first 20-30 generations) • Subsequent improvement due to random favorable mutation operations • Three out of four runs find the global solution within 200 generations (ran 300)

  5. Surface effects • Incomplete modeling of surface convection zone leads to systematic errors • Calibrated with difference between fit to “Model S” and BiSON radial modes • Global fit to BiSON data, including scaled empirical correction for all modes

  6. BiSON results • Fit to 36 frequencies with l= 0-2 and constraints on temperature, luminosity • Matches frequencies with scaled surface correction better than 0.6 mHz r.m.s. • Temperature and age within +0.1%, luminosity and radius within +0.4%

  7. Science Gateway • Web interface to specify observations with errors, or upload as a text file • Specify parameter values to run one instance of the model, results archived • Source code available for those with access to large cluster or supercomputer

  8. TeraGrid workflow 128-way parallel 100-300 gen/week

  9. Community management • Public users: anonymous visitors will see the status of current model-fitting runs and will be allowed to browse/download archived runs • Registered users: KASC members who provide name, institution, and email can download code, submit single-model and model-fitting requests • Gateway managers: approve new registrations, modify job and queue policy, and manage public archiving of the model-fitting results

  10. Data release • Model-fitting in progress: will be shown with KIC number, J2000 coordinates, requesting scientist, institution, resources allocated and job progress • Completed model-fitting: available to registered users during the proprietary period of the data, then archived on the website for all users • Single-model requests: archived immediately on the website for all users (to avoid duplicate runs), with choice of binary files in big/little ENDIAN

  11. Open questions • Should all of the model-fitting results be visible to all registered KASC members, or do we need to define subgroups (e.g. for KASOC)? • When should the model-fitting results be visible to non-registered users? How should the timing of the public release be determined? • Should there be limits on the number of jobs submitted to the queue by each user? Limits on the number of jobs running? Job priorities?

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