Microlensing for non experts
Sponsored Links
This presentation is the property of its rightful owner.
1 / 31

Microlensing for non-experts PowerPoint PPT Presentation


  • 99 Views
  • Uploaded on
  • Presentation posted in: General

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!.

Download Presentation

Microlensing for non-experts

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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!


Radial velocity and transit both conceptually simple

How to present microlensing simply?


1. Create strong gravitational field


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


3. Demonstrate magnification maps


4. Teaching exercises

Liebes theorem

Umin

Masses of the lenses


5. Use magnification maps


Typical low resolution map


Typical medium resolution map


Typical high resolution map


Resolution adjustable

Typical star size


Typical track of source star


Parallax corrections

Andy Gould ApJ 606, 319 2004


Parallaxed track


Beware the Moire effect!

Shoot more rays


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


Petra Tang - MB07397

Chi2

theta t0


Eike van Seggern – MB02033

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


Planet orbiting the binary lens?


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


40 GeV to 80 GeV, for $10, in one meter, riding a plasma wakefield

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


Invitation – January2010 meeting

Auckland,New Zealand


Conference centre


Auckland harbour


Race


Piha


Test plasma wakefield concept


  • Login