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!. - PowerPoint PPT PresentationTRANSCRIPT
Microlensing for non-experts Microlensing for non-experts
Philip YockPhilip Yock
13th Microlensing Workshop Institut d'Astrophysique de Paris,
January 19, 20, 21, 2009
January 2009Cover story
“Race to Find Alien Planets”
Radial velocity, transits, Kepler- but nothing on microlensing!
Radial velocity and transit both Radial velocity and transit both conceptually simple conceptually simple
How to present microlensing simply?
1. Create strong gravitational field
2. Qualitative picture2. 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 maps3. Demonstrate magnification maps
4. Teaching exercises4. Teaching exercises
Liebes theoremUmin
Masses of the lenses
5. Use magnification maps5. Use magnification maps
Typical low resolution mapTypical low resolution map
Typical medium resolution mapTypical medium resolution map
Typical high resolution mapTypical high resolution map
Resolution adjustable Resolution adjustable
Typical star size
Typical track of source starTypical track of source star
Parallax correctionsParallax correctionsAndy Gould ApJ 606, 319 2004
Parallaxed trackParallaxed track
Beware the Moire effect!Beware the Moire effect!
Shoot more rays
SummarySummary
Microlensing beautiful, but quite Microlensing beautiful, but quite complicatedcomplicated
Demonstrations possible Demonstrations possible
Teaching exercises possibleTeaching exercises possible
Magnification maps conceptually clear, Magnification maps conceptually clear, versatile, if not fastest versatile, if not fastest
Proof - test subjectsProof - test subjects
Ian Bond, Christine Botzler, Sarah Ian Bond, Christine Botzler, Sarah Holderness, Yvette Perrott, Lydia Phillpott, Holderness, Yvette Perrott, Lydia Phillpott, Nick Rattenbury, Sarah Schoen, Eike van Nick Rattenbury, Sarah Schoen, Eike van Seggern, Petra TangSeggern, Petra Tang
Proof - test subjectsProof - test subjects
Ian Bond, Christine Botzler, Sarah Ian Bond, Christine Botzler, Sarah Holderness, Yvette Perrott, Lydia Phillpott, Holderness, Yvette Perrott, Lydia Phillpott, Nick Rattenbury, Sarah Schoen, Eike van Nick Rattenbury, Sarah Schoen, Eike van Seggern, Petra TangSeggern, Petra Tang
I couldn’t be happier
Petra Tang - MB07397Petra Tang - MB07397
Chi2
theta t0
Eike van Seggern – MB02033Eike van Seggern – MB02033
A&A 411, L493, 2003 439, 645 , 2005
Planet orbiting the binary lens?Planet orbiting the binary lens?
Sarah SchoenSarah Schoen
Plasma wakefield accelerationPlasma wakefield acceleration
New Scientist, Jan 2009 – “Desktop atom smashers New Scientist, Jan 2009 – “Desktop atom smashers could replace LHC”could replace LHC”
Analaogous to microlensing – uses naturally occurring Analaogous to microlensing – uses naturally occurring fields – electromagnetic, not gravitational fields – electromagnetic, not gravitational
Could measure the charge of the quarkCould measure the charge of the quark
Could test multi-muons from FermilabCould test multi-muons from Fermilab
40 GeV to 80 GeV, for $10, in one 40 GeV to 80 GeV, for $10, in one meter, riding a plasma wakefield meter, riding a plasma wakefield
Chan Joshi et al, Nature 445, 741-744 (2007)
Invitation Invitation – – JanuaryJanuary 2010 meeting2010 meeting
Auckland, New Zealand
Conference centreConference centre
Auckland harbourAuckland harbour
RaceRace
Piha Piha
Test plasma wakefield conceptTest plasma wakefield concept