Topic: Research News

Scientists used a powerful telescope to study giant planets outside our solar system. They found that these planets spin faster than their bigger brown dwarf companions.

Astronomers have long wondered if there's a link between a planet's mass and its rotation speed. In our own Solar System, Jupiter and Saturn are great examples. Despite being massive, they take around 10 hours to complete one rotation. To test this idea, researchers used the W.M. Keck Observatory in Hawaii to study many distant giant planets. They looked at 32 gas giants and brown dwarf companions, including 6 planets bigger than Jupiter and 25 brown dwarf companions. The results showed an interesting pattern: giant gas planets tend to spin faster than more massive brown dwarfs. To make sure their findings were accurate, the researchers combined their data with previous measurements from other studies. This gave them a big dataset of 43 stellar/substellar companions and giant planets, along with 54 free-floating brown dwarfs and planetary-mass objects. The team was led by scientists at Northwestern University's Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA). Their findings were published in The Astronomical Journal.

The researchers used a special instrument called the Keck Planet Imager and Characterizer (KPIC) to measure the spin of these distant worlds. As a planet rotates, features in its atmosphere cause subtle changes in its spectrum. By measuring these changes, astronomers can figure out how quickly the object is spinning. Lead author Dino Chih-Chun Hsu explained the significance of these measurements: 'Spin is like a fossil record of how a planet formed. By measuring how quickly these worlds spin, we can start to piece together the physical processes that shaped them millions of years ago.'

Implications

Scientists used a powerful telescope to study giant planets outside our solar system. They found that these planets spin faster than their bigger brown dwarf companions.