Microlensing for non experts
Download
1 / 31

Microlensing for non-experts - PowerPoint PPT Presentation


  • 155 Views
  • Uploaded on

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!.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Microlensing for non-experts' - chyna


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

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
Radial velocity and transit both conceptually simple

How to present microlensing simply?



2 qualitative picture
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
4. Teaching exercises

Liebes theorem

Umin

Masses of the lenses






Resolution adjustable
Resolution adjustable

Typical star size



Parallax corrections
Parallax corrections

Andy Gould ApJ 606, 319 2004



Beware the moire effect
Beware the Moire effect!

Shoot more rays


Summary
Summary

  • Microlensing beautiful, but quite complicated

  • Demonstrations possible

  • Teaching exercises possible

  • Magnification maps conceptually clear, versatile, if not fastest


Proof test subjects
Proof - test subjects

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


Proof test subjects1
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
Petra Tang - MB07397

Chi2

theta t0


Eike van seggern mb02033
Eike van Seggern – MB02033

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



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

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


Invitation january 2010 meeting
Invitation wakefield – January2010 meeting

Auckland,New Zealand



Auckland harbour
Auckland harbour wakefield


Race wakefield


Piha wakefield