Third giant exoplanet discovered orbiting the star Beta Pictoris

Star system: Beta Pictoris | Distance from the Sun: 64 light years

A third giant exoplanet has been discovered in the Beta Pictoris system through direct imaging, marking a significant milestone in planetary science. This new world, designated Beta Pictoris d, joins two previously known planets orbiting this young, nearby star. The discovery was made by combining modern ground-based observations with archival data, revealing a planet that orbits at a greater distance than its siblings while remaining aligned in the same orbital plane.

The planet was identified by analyzing data collected over an 11-year period, allowing the team to confirm its orbital motion around the host star. By using advanced infrared imaging techniques, the presence of the planet was confirmed as a gravitationally bound object rather than a background star.

Measurements suggest the planet is a gas giant with a mass approximately 2.4 times that of Jupiter. Its atmosphere shows signs of carbon dioxide, and it appears to have a higher concentration of metals—elements heavier than hydrogen and helium—than objects that drift through space without a host star. Its orbit is believed to play a role in shaping the inner boundary of the star's debris disk, a massive ring of dust and rocky material.

Key findings
- Beta Pictoris d is a gas giant with a mass estimated at 2.4 times that of Jupiter.
- The planet orbits its star at a distance of approximately 26 astronomical units.
- Atmospheric analysis indicates strong carbon dioxide absorption and higher metal content.
- The planet is coplanar with the inner two planets of the system.
- The discovery was confirmed using an 11-year baseline of astrometric data.

Scientific study

Direct Imaging Discovery of Giant Exoplanet β Pictoris d: A Decade-Long Game of Hide-and-Seek (external link)