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Finding Exoplanets - hot Jupiters" because their...

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Finding Exoplanets Results and Testing the Theory The figure below summarizes the orbit sizes and orbit eccentricities of the 388 other planetary systems known at the time this was written from the Extra Solar Planets Encyclopedia . The figures include exoplanet data that still need to be confirmed. Data for 421 exoplanets with known orbit sizes are plotted on the left and data for 400 exoplanets with known eccentricities are plotted on the right. Most of these exoplanets are Saturn-Jupiter mass or larger and those that transit their star have densities like Saturn-Jupiter or less. Two things to notice are how close the large planets are to their stars and the large eccentricities of some of the planet orbits. The exoplanets very close to their stars are called "
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Unformatted text preview: hot Jupiters " because their temperatures can get up to 1000 deg C in their cloudtops (the clouds would probably be made out of rock-dust minerals instead of the ammonia, ammonium hydrosulfide, and water clouds of the much colder Jupiter and Saturn). The hot Jupiters with low densities have atmospheres puffed out by the extreme solar heating---that inflates their diameter. The Condensation Model outlined in the previous section predicts that large planets will only form far from the young star. Giant planets start from a core of rock and ices that were able to solidify far from the intense heat of the young star. The rock-ice cores then pull in surrounding gas by their gravity. Near the star, the temperature is too high to form the rock-ice cores....
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