Didier Queloz

Didier Queloz. A Swiss astronomer renowned for his groundbreaking discovery of the first exoplanet orbiting a Sun-like star, fundamentally altering the field of astrophysics. His pioneering work, conducted alongside his doctoral advisor Michel Mayor, provided the first definitive evidence of a gas giant planet orbiting the star 51 Pegasi, challenging established theories of planetary formation. This seminal achievement earned him the Nobel Prize in Physics in 2019 and propelled a new era of exoplanet research, leading to the discovery of thousands of worlds beyond our Solar System.

Early life and education

Born in Geneva, Queloz developed an early interest in science, which he pursued at the University of Geneva. He earned his Diploma in physics in 1990 and continued his graduate studies under the supervision of astronomer Michel Mayor at the university's Observatory of Geneva. His doctoral research focused on developing and refining the radial-velocity method, a technique for detecting extrasolar planets by measuring the subtle wobble of a star caused by an orbiting body's gravitational pull. This work utilized the ELODIE spectrograph on the telescope at the Haute-Provence Observatory in France.

Discovery of 51 Pegasi b

In 1995, while analyzing data from the ELODIE spectrograph, Queloz and Mayor detected a periodic signal from the star 51 Pegasi, located approximately 50 light-years away in the constellation of Pegasus. The signal indicated the presence of a planetary-mass companion, designated 51 Pegasi b, completing an orbit every 4.2 days. This "Hot Jupiter" was a massive surprise, as its close proximity to its parent star contradicted existing models based on the architecture of our own Solar System. The announcement, made at a conference in Florence, was initially met with skepticism but was soon confirmed by teams using the Lick Observatory and other facilities, revolutionizing the field.

Subsequent research and career

Following his historic discovery, Queloz has been a leading figure in exoplanet science. He held positions at the University of Geneva and became a professor at the University of Cambridge, where he was a fellow of Trinity College, Cambridge and co-led the Cambridge Exoplanet Research Centre. His research expanded to include the characterization of exoplanet atmospheres and the search for Earth-like planets. He played key roles in instruments like the HARPS spectrograph at the La Silla Observatory and the CORALIE spectrograph. In 2021, he joined ETH Zurich while maintaining a link to Cambridge, and he is involved with upcoming missions such as the PLATO space telescope operated by the European Space Agency.

Awards and honors

Queloz's contributions have been recognized with numerous prestigious awards. He shared the 2019 Nobel Prize in Physics with Michel Mayor and James Peebles. Earlier honors include the 2011 BBVA Foundation Frontiers of Knowledge Award and the 2017 Wolf Prize in Physics, both shared with Mayor. He is a recipient of the Marcel Benoist Prize and has been elected a fellow of the Royal Society and a member of the French Academy of Sciences. His work was also instrumental in earning the entire exoplanet detection team the 2015 Kyoto Prize.

Personal life

Queloz is married and has children. Known for his energetic and engaging personality, he is a passionate advocate for science communication and education. He has spoken extensively about the implications of discovering exoplanets and the potential for finding life beyond Earth. In interviews, he often reflects on the profound shift in perspective his discovery caused, moving humanity from speculation to certainty about the plurality of worlds in the Milky Way.

Category:Swiss astronomers Category:Nobel laureates in Physics Category:Exoplanetologists Category:1966 births Category:Living people