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🪐 How 51 Pegasi b Revealed the First Hot Jupiter

Learn how a star's tiny, repeating wobble revealed 51 Pegasi b and changed the search for planets around Sun-like stars.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A star that would not sit stillSee why the first exoplanet was inferred from a star's motion rather than photographed.At Haute-Provence, a short, repeating stellar wobble made an invisible companion testable.
Turning starlight into motionUnderstand how Doppler shifts turn spectral lines into an orbital measurement.ELODIE read tiny wavelength changes and transformed them into a radial-velocity curve.
The announcement that changed the mapPlace 51 Pegasi b in the history of exoplanet discovery and planetary science.The 1995 announcement introduced a hot Jupiter and clarified what “first” meant.
From one wobble to thousands of worldsTrace how confirmation made radial velocity a general planet-hunting method.Independent confirmation and complementary techniques turned one surprising signal into a field.

Questions this course answers

What did Mayor and Queloz measure to find 51 Pegasi b?

The planet was inferred from the host star's repeating toward-and-away motion, measured through shifts in spectral lines.

Why did 51 Pegasi b's four-day orbit help the discovery?

A short period let astronomers see the velocity pattern repeat over only a few nights.

What does a spectrograph detect in the radial-velocity method?

Motion toward or away from Earth shifts the wavelengths of the star's spectral fingerprints.

In what sense was 51 Pegasi b the first exoplanet?

Pulsar planets had been found earlier, but 51 Pegasi b was the landmark confirmation around a solar-type main-sequence star.

Why was an independent observation from Lick Observatory important?

A second team finding the same rapid variation reduced the chance that ELODIE's result was an instrumental artifact.

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