Topic: Space

A new study found that aging stars may be destroying giant planets that orbit close to them. Researchers at UCL and the University of Warwick studied nearly half a million stars and discovered a pattern: planets in tight orbits are less common around red giants.

Aging stars, like our Sun, eventually run out of fuel and expand into red giants. Scientists estimate that our Sun will reach this stage in about five billion years. Researchers at UCL and the University of Warwick studied nearly half a million stars to see how their giant planets fare during this process.

They found that 130 planets and planet candidates orbit close to these stars, but there's a pattern: planets in tight orbits are less common around red giants. This suggests that many of these close-in planets may have already been destroyed.

The team believes the process is driven by a gravitational tug-of-war between the star and its planet, known as tidal interaction. As a star grows larger, this effect becomes stronger.

What does this mean for our solar system? The findings raise questions about the distant future of our own solar system. In a few billion years, our Sun will enlarge and become a red giant. Will the solar system planets survive? Earth is safer than the giant planets in our study, but life on Earth probably would not.

To carry out the study, researchers used data from NASA's Transiting Exoplanet Survey Satellite (TESS). They relied on a computer algorithm to detect tiny, repeated dips in starlight that occur when a planet passes in front of its star.

Why It Matters

This discovery can help us better understand how our own solar system will change in the distant future. It's essential for scientists to study the evolution of stars and their planets to prepare for what's to come.

Key Facts

• Aging stars, like our Sun, eventually run out of fuel and expand into red giants.
• The researchers studied nearly half a million stars to see how their giant planets fare during this process.
• 130 planets and planet candidates orbit close to these stars.
• Planets in tight orbits are less common around red giants.
• The team believes the process is driven by a gravitational tug-of-war between the star and its planet, known as tidal interaction.

Key Terms

Red Giant

A stage of a star's life cycle where it expands into a larger size

Implications

This discovery can help us better understand how our own solar system will change in the distant future. It's essential for scientists to study the evolution of stars and their planets to prepare for what's to come.