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Other Planets (Exoplanets)

Other Planets (Exoplanets). OGLE-2005-BLG-390Lb. Discovered in 2005, via `gravitational microlensing’, which uses the properties of lensing of light to detect extrasolar planets. Collaborations include: OGLE (Optical Gravitiational Lensing Experiment)

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Other Planets (Exoplanets)

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  1. Other Planets(Exoplanets)

  2. OGLE-2005-BLG-390Lb Discovered in 2005, via `gravitational microlensing’, which uses the properties of lensing of light to detect extrasolar planets. Collaborations include: OGLE (Optical Gravitiational Lensing Experiment) PLANET (Probing Lensing Anomalies NETwork) A Earth-size planet rotating around a red dwarf star (low-temperature star), very cold (-364 F), with an orbital period of about 10 years. The planet-star system is located about 6100 lyrs from the Earth, towards the Galaxy’s bulge.

  3. XO-1b A planet the size of Jupiter discovered with the `transit’ method, when the light from the star dips (by 1-2%) because of the dark planet that transits in front of it. Located 600 lyrs from the Earth, this planet is orbiting (in 4 days) a sun--like star, in the constellation Corona Borealis. The transit method has identified about 10-20 of the extra-solar planets currently known (about 180).

  4. Epsilon-Eridani b Extrasolar Planets help understand the birth and evolution of our own solar system. EE-b was discovered in 2000, using the radial velocity method. With this method, the subtle motion of a star towards and away from us is used to determine that it is sharing an orbit with another body. In this case, EE-b is about 1.5 Jupiter masses, and is on the same orbit plane as the star’s debris disk. EE is about 10.5 lyrs from Earth, the closest planet-bearing system. EE-b is on the same plane as the debris disk from the parent star. Thus, confirms the origin of planets.

  5. Detecting Exo-planets • About 180 extra-solar planets have been detected so far. • Methods: • Astrometric measurements • Radial velocity method • Transit • Gravitational microlensing • All the methods above require high precision measuremnts, but are yielding large numbers of detections.

  6. What about Life? • Planets can be considered habitable if the are within the `habitable zone’ • The `habitable zone’ is defined as the range of orbits which enable water to exist and be in liquid form. • So far, none of the planets can be considered within the habitable zone; most known planets orbit the star very close. • However, some have suggested planet migration.

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