why is the existence of "hot jupiters" puzzling?
The close proximity to their stars and high surface-atmosphere temperatures resulted in the moniker "hot Jupiters". Hot Jupiters are giant planets that orbit very close to their host star, typically less than one-tenth the distance between Earth and the Sun. If so WASP-94 could be an important system for understanding why Hot Jupiters are so close to the star they orbit. They are found in about 1 percent of systems. “Most hot Jupiters reflect about 40 percent of starlight.” However, observations conducted of the night side of the planet show that things are quite different there. "Why is there anything at all? Hot Jupiters are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital periods (P < 10 days). The first extra-solar planet detected around a star similar to the Sun was 51 Peg. Many more transiting systems await discovery at fainter magnitudes. They typically have temperatures of a thousand to several thousand … The existence of huge, Jupiter-size planets so near to their stars is a long-standing puzzle, since they cannot form near to the star where it is far too hot. A rotation rate of 90 hours is much slower than what is predicted for HD 80606b, puzzling astronomers, and adding to the enduring mystique of hot Jupiters. The Jupiter-like masses or hot Jupiters are gas giant exoplanets that are found outside the solar system. It has about the mass of Jupiter. But unlike Jupiter, which is five times as far from the Sun as Earth and orbits the Sun in 12 years, 51 Peg is twenty times closer to its star than Earth is to the Sun and orbits its star every 4 days. Our nebular theory of the formation of the Solar System says that planets like Jupier can't form near their star, so how did these "hot Jupiters" come to be as we see them? many of the planets that have been discovered orbiting other stars are "hot Jupiters", or planets the size of Jupiter but that orbit very close to their stars. Why are there no "hot Jupiters" in our own Solar System? The answers are diverse, as are the philosophical approaches. Hot Jupiters are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital periods (P<10 days). Yet this sixteen-author volume is remarkably unified: each chapter puts in place a different piece of a big puzzle. [Ibid.] Indeed, it’s hard to find anything the experts got right about this exoplanet. The Puzzle of Existence offers a treasure of cutting-edge answers to this classic question.

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