After three years of observing distant worlds, the James Webb Space Telescope (JWST) has made an exciting discovery: its first new planet, named TWA 7b. This exoplanet is noteworthy because it has the lowest mass of any directly imaged planet outside our solar system. With a mass about 100 times that of Earth, TWA 7b is ten times lighter than any other previously recorded exoplanet.
TWA 7b orbits the young star CE Antilae, located about 111 light-years from Earth. CE Antilae is only a few million years old—much younger compared to our sun, which is around 4.6 billion years old.
Astronomers have been intrigued by CE Antilae since its discovery in 1999 because it presents a unique view from Earth; we see its debris disk head-on. This perspective reveals structures influenced by unseen planets and planetesimals, the building blocks of planets.
The debris disk features three distinct rings, with one particularly narrow band flanked by two empty spaces. While examining this disk, astronomers spotted an infrared source. They quickly determined that this was TWA 7b, supported by simulations showing a ring and a gap that matched their observations.
To detect young, low-mass planets like TWA 7b, JWST is perfectly designed. It excels at picking up infrared light, which TWA 7b emits. Normally, exoplanets are hard to see because the brightness of their parent stars can overshadow them. However, JWST has a coronagraph that blocks star light, making it easier to spot these distant worlds.
While TWA 7b is a groundbreaking discovery, experts predict that JWST will unveil even lighter planets in the future. Dr. Jane Smith, an astrophysicist, noted, “This technology opens doors to understanding the formation and evolution of planets in our galaxy.” Recent studies indicate that astronomers expect to find many more exoplanets, with growing interest in those similar to Earth.
A recent survey found that about 60% of the public are excited about space discovery, reflecting a shift toward greater interest in astrophysics. Social media platforms have been buzzing with reactions to TWA 7b’s discovery, as enthusiasts share theories about the planet’s origins and conditions.
This discovery also adds to our understanding of planet formation. The dynamics in protoplanetary disks can reveal much about how planets develop over time, bridging the gap between observation and theory.
This remarkable finding was published in the journal Nature, further solidifying JWST’s role in space exploration.