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Paul Butler

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description Paul Butler Overview

Paul Butler is an American astronomer at the Carnegie Institution for Science's Department of Terrestrial Magnetism. He specializes in the detection of extrasolar planets using high-precision radial velocity spectroscopy. By co-developing advanced optical spectrographs and analysis techniques in the 1990s, he played a central role in the discovery of dozens of the earliest known exoplanets orbiting Sun-like stars, advancing observational astronomy.

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What exoplanet is Paul Butler associated with discovering?

Paul Butler played a major role in confirming 51 Pegasi b, the first exoplanet found orbiting a Sun-like star. Michel Mayor and Didier Queloz announced the initial discovery in 1995, and Butler and Geoffrey Marcy helped establish it through precision measurements.

How does Paul Butler detect planets?

His specialty is radial-velocity spectroscopy, which measures the tiny Doppler shifts caused by a planet's gravitational pull on its star. The method can reveal planets that do not pass directly in front of their stars.

What instruments are connected with Butler's exoplanet work?

Butler's work used high-resolution spectrographs, including the HIRES instrument on the Keck telescope. These instruments measure stellar velocity changes that can be only a few meters per second.

Where has Paul Butler worked?

Paul Butler is associated with the Carnegie Institution for Science and its Department of Terrestrial Magnetism. His research has focused on long-term precision surveys of nearby stars and their planetary systems.