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Astrophysicists find triple star system with “hot Jupiter”

8 April 2016 Astronomy Now

Exoplanet KELT-4Ab, about one and a half times the size of Jupiter, orbits the main star of a three-star system every three days. The system’s other two stars orbit each other once every 30 years while simultaneously orbiting the main star — and the planet — once every 4,000 years. The triple star system lies about 685 light-years from Earth.

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A highly eccentric “hot Jupiter” exoplanet

29 March 2016 Astronomy Now

Astronomers have observed the extreme temperature variations of HD 80606 b, a Jupiter-sized exoplanet with a highly eccentric, comet-like orbit that brings it scorchingly close to its parent star every 111 days. The researchers also calculated the planet’s rotation rate — the first exoplanet rotation rate ever obtained.

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Enormous planet found to be in a quadruple star system

7 March 2015 Astronomy Now

Astronomers have discovered the second known case of a four-star planetary system. The planet was known before and has a mass ten times that of Jupiter, but was thought to have only three parent stars, not four. The findings help researchers understand how multiple star systems can influence the development and fate of planets.