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KOI-3278: A self-lensing binary star system
by Ivan Adamin in March-April 2014 (#5)
More than 40% of stars are in pairs that orbit around each other, called binary star systems. KOI-3278 is a pair of stars consisting of a white dwarf and a main sequence G-star with an orbital period of 88.18 days. This system produces the first ever case of periodic microlensing signal, based on data collected by NASA's Kepler planet-hunting space observatory. Previously theorized, around forty years ago, this phenomenon has never actually been observed directly until now.
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