Astronomers discover faintest exoplanet directly photographed

Astronomers have achieved a rare feat by directly imaging a previously unconfirmed third planet orbiting the young star Beta Pictoris, located approximately 64 light-years from Earth.

Dubbed "Beta Pictoris d," this exoplanet was discovered while scientists were examining changes in the known planets of the Beta Pictoris system using data from the European Southern Observatory's Very Large Telescope (VLT) and the James Webb Space Telescope. The Beta Pictoris system is considered astronomically young, with an estimated age of 23 million years, and is surrounded by vast disks of dust and debris where new planets form.

Beta Pictoris d joins two previously discovered gas giants in the system, Beta Pictoris b and c, which are about ten times the mass of Jupiter. The new planet has a mass approximately 2.4 times that of Jupiter and a temperature of about 330 degrees Celsius, making it considerably cooler than its siblings. Its faintness, estimated to be 100 times dimmer than Beta Pictoris b, and its distant orbit from the star had previously hidden it from direct observation within the star's glare.

Scientists overcame this challenge by using advanced telescope technology to capture images rapidly. The ability to directly image multiple planets within the same formation environment provides invaluable data for understanding how different planetary structures evolve under similar conditions. Researchers anticipate that future observatories, such as the Extremely Large Telescope (ELT), will enable the discovery of even smaller and dimmer worlds within such systems.