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Microlensing for non-experts

Microlensing for non-experts. 13th Microlensing Workshop  Institut d'Astrophysique de Paris, January 19, 20, 21, 2009. Philip Yock. January 2009 Cover story. “Race to Find Alien Planets”. Radial velocity, transits, Kepler - but nothing on microlensing!.

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Microlensing for non-experts

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  1. Microlensing for non-experts 13th Microlensing Workshop  Institut d'Astrophysique de Paris, January 19, 20, 21, 2009 Philip Yock

  2. January 2009 Cover story “Race to Find Alien Planets” Radial velocity, transits, Kepler - but nothing on microlensing!

  3. Radial velocity and transit both conceptually simple How to present microlensing simply?

  4. 1. Create strong gravitational field

  5. 2. Qualitative picture • Einstein arcs slide around the ring when Amax >> 1 • If a low-mass planet is close to the ring, it perturbs the arc as it passes by • Width of perturbation equals ‘slide-by’ time • Height of perturbation  planet mass • Height of perturbation (roughly) independent of Amax • Perturbations occur in the FWHM  24 hours

  6. 3. Demonstrate magnification maps

  7. 4. Teaching exercises Liebes theorem Umin Masses of the lenses

  8. 5. Use magnification maps

  9. Typical low resolution map

  10. Typical medium resolution map

  11. Typical high resolution map

  12. Resolution adjustable Typical star size

  13. Typical track of source star

  14. Parallax corrections Andy Gould ApJ 606, 319 2004

  15. Parallaxed track

  16. Beware the Moire effect! Shoot more rays

  17. Summary • Microlensing beautiful, but quite complicated • Demonstrations possible • Teaching exercises possible • Magnification maps conceptually clear, versatile, if not fastest

  18. Proof - test subjects Ian Bond, Christine Botzler, Sarah Holderness, Yvette Perrott, Lydia Phillpott, Nick Rattenbury, Sarah Schoen, Eike van Seggern, Petra Tang

  19. Proof - test subjects Ian Bond, Christine Botzler, Sarah Holderness, Yvette Perrott, Lydia Phillpott, Nick Rattenbury, Sarah Schoen, Eike van Seggern, Petra Tang I couldn’t be happier

  20. Petra Tang - MB07397 Chi2 theta t0

  21. Eike van Seggern – MB02033 A&A 411, L493, 2003 439, 645 , 2005

  22. Planet orbiting the binary lens?

  23. Sarah Schoen • Plasma wakefield acceleration • New Scientist, Jan 2009 – “Desktop atom smashers could replace LHC” • Analaogous to microlensing – uses naturally occurring fields – electromagnetic, not gravitational • Could measure the charge of the quark • Could test multi-muons from Fermilab

  24. 40 GeV to 80 GeV, for $10, in one meter, riding a plasma wakefield Chan Joshi et al, Nature 445, 741-744 (2007)

  25. Invitation – January2010 meeting Auckland,New Zealand

  26. Conference centre

  27. Auckland harbour

  28. Race

  29. Piha

  30. Test plasma wakefield concept

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