Gravitational Lensing
Gravitational Lensing
Gravitational Lensing
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Deflection angle Introduction to <strong>Gravitational</strong> <strong>Lensing</strong> Applications<br />
Discovery y of Exoplanets p<br />
Light curve of OGLE 2003‐BLG‐235/MOA 2003‐BLG‐53<br />
Adopted from: www.nd.edu/~bennett/<br />
• Microlensing is the only method of<br />
dt detecting ti planets l t in i the th other th galaxies l i<br />
until now<br />
• Without a planet, planet we can only observe hill hill‐<br />
shaped curve due to the star (single‐lens<br />
system)<br />
• A planet p with star pproduces two spikes p on<br />
the curve (two‐lens system)<br />
• Graph analysis shows the existence of<br />
small mass planet
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