Astronomers have taken a closer look at a giant planet called Beta Pictoris b, hoping to solve one of the biggest mysteries in planetary science: where did this massive world form?
Although new observations have provided much better data, the planet is still refusing to reveal its true origins.
Beta Pictoris b, often called Beta Pic b, is a young gas giant located in a planetary system about 23 million years old.
It was first discovered in 2008 and is one of the few exoplanets that scientists have photographed directly.
The planet is about 11 times more massive than Jupiter and takes around 23 years to complete one orbit around its bright host star.
An international team of researchers, led by scientists from the Max Planck Institute for Astronomy in Germany, used the newly upgraded GRAVITY+ instrument to study the planet.
The instrument is attached to the European Southern Observatory’s Very Large Telescope Interferometer in Chile and allows astronomers to examine distant planets with remarkable precision.
The researchers wanted to find out where Beta Pic b was born within the disk of gas and dust that surrounded its young star.
Like planets in our own solar system, Beta Pic b formed from material left over after the star was created. However, scientists are still trying to understand exactly where giant planets like this begin their lives.
To investigate this, the team measured two slightly different forms of carbon monoxide in the planet’s atmosphere.
These forms contain different versions, or isotopes, of carbon. Scientists believed that comparing the amounts of these two molecules could reveal whether the planet formed close to its star, where temperatures were warm, or farther away beyond the “snowline,” where carbon monoxide freezes into ice.
Earlier observations suggested that Beta Pic b may have formed far from its star before slowly moving inward to its current orbit. However, those earlier measurements were uncertain because they were made with an older version of the instrument.
The new GRAVITY+ observations produced much more accurate results. They showed that the ratio of the two carbon monoxide molecules is actually much higher than previously thought. The updated measurement matches results from another research team using a different telescope, giving scientists greater confidence in the new data.
Surprisingly, the new findings no longer support the idea that Beta Pic b formed far beyond the snowline.
Instead, they suggest the planet likely formed closer to its current location. However, there is a problem. Similar carbon isotope ratios are found in many other giant planets, as well as throughout our solar system and even in the gas between stars.
This means the measurement is not as useful as scientists had hoped for identifying where a planet was born.
The researchers also found small hints that the planet’s brightness changes over time. These changes may be linked to its rapid rotation, which takes only about 8.7 hours.
If confirmed, the variations could be caused by clouds or changing chemical reactions in the planet’s atmosphere. More observations will be needed before scientists can be sure.
Although the mystery remains unsolved, the study highlights the impressive power of the upgraded GRAVITY+ instrument. Astronomers believe it will play an important role in future studies as they continue searching for new ways to uncover how giant planets form and evolve throughout the galaxy.
