lec06_07oct2011

lec06_07oct2011 - What(exo-planetary science can be done...

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Ge/Ay133 What (exo)-planetary science can be done with microlensing?
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Other routes to Earth-like planets? b α = 4GM/bc 2
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Microlensing example:
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Microlensing example:
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Best geometry uses stars at a few kpc (the lens) against the Galactic Bulge (light source). 5.5 M Earth planet at 2.6 AU around a M-dwarf (0.22 M ) primary at 6.6 ± 1.0 kpc. J.-P. Beaulieu et al. Nature 439 , 437-440 (26Jan2006)
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Magnification map of the lensing system in OGLE 2003-BLG-235/MOA 2003-BLG-53. I.A. Bond et al. 2004, ApJ, 606, L155 Biggest perturbation when planet is near Einstein ring AND the location of the background stellar image (so, some/ many planets missed).
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OGLE 2003-BLG-235/MOA 2003-BLG-53 Animations: I.A. Bond et al. 2004, ApJ, 606, L155
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Are there Earth-like planets beyond the snow-line?
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Something like ten systems so far, +’s/-’s ? Advantages of the microlensing technique to detect exoplanets include: * More sensitive than most other techniques to small-mass planets (like Earth) * Most sensitive to planets in our Galaxy that have orbit sizes of a few astronomical units (like those of Mars or Jupiter)
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