Microlensing for non-experts

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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

13th Microlensing Workshop

Institut d\'Astrophysique de Paris,

January 19, 20, 21, 2009

Philip Yock

January 2009

Cover story

“Race to Find Alien Planets”

- but nothing on microlensing!

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
4. Teaching exercises

Liebes theorem

Umin

Masses of the lenses

Typical star size

Parallax corrections

Andy Gould ApJ 606, 319 2004

Summary
• Microlensing beautiful, but quite complicated
• Demonstrations possible
• Teaching exercises possible
• Magnification maps conceptually clear, versatile, if not fastest
Proof - test subjects

Ian Bond, Christine Botzler, Sarah Holderness, Yvette Perrott, Lydia Phillpott, Nick Rattenbury, Sarah Schoen, Eike van Seggern, Petra Tang

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

Eike van Seggern – MB02033

A&A 411, L493, 2003 439, 645 , 2005

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

Chan Joshi et al, Nature 445, 741-744 (2007)