Astronomers have discovered a fascinating exoplanet, a rare find that orbits its twin stars in a unique and intriguing manner. This Tatooine-like planet, HD 143811 AB b, has captivated scientists with its extraordinary 300-year orbit, making it six times closer to its parent stars than any previously imaged binary system exoplanet. But here's where it gets even more controversial: despite this proximity, its 'year' lasts 300 times longer than Earth's year.
The discovery of this exoplanet is a testament to the power of revisiting old data. Jason Wang, an exoplanet imaging expert, and his team stumbled upon HD 143811 AB b in archival data collected by the Gemini South telescope and its Gemini Planet Imager (GPI) instrument almost a decade ago. The GPI, a coronagraph-like instrument, blocked the stars' glare to capture the faint planet's images using adaptive optics.
The team's initial search for new planets in the GPI data was unsuccessful, but their diligence paid off. Nathalie Jones, a team member, analyzed the data from 2016 to 2019, cross-referencing it with W.M. Keck Observatory data. This led to the discovery of a faint object following the star's motion, indicating a potential planet.
Through meticulous analysis, Jones and her team confirmed that HD 143811 AB b is indeed a planet, despite being initially missed by astronomers. This planet is a giant, approximately six times the size of Jupiter, and is around 13 million years old, which is relatively young in cosmic terms.
The planet's orbit is what truly captivates astronomers. Despite being six times closer to its binary stars than other planets in similar systems, it takes a staggering 300 Earth years to complete one orbit. This raises intriguing questions about its formation and the dynamics of its unique orbit.
The team's findings, published in The Astrophysical Journal Letters, highlight the importance of revisiting old data and the ongoing quest to understand the complexities of exoplanetary systems. As Wang notes, the discovery of HD 143811 AB b underscores the rarity of such exoplanets, making it a significant contribution to our understanding of planetary formation and dynamics.
