NASA’s New Technique for Studying Star Spots

NASA scientists have developed a new method to study “star spots” or irregularities in star brightness by using planets that transit in front of their host stars. This innovative technique, known as the “Twinkling Star Process,” can also be used to learn more about planetary atmospheres.

Understanding the Transit Technique

The “Twinkling Star Process” builds on the transit method used by the TESS satellite and the Kepler space probe, both of which have been highly successful in discovering exoplanets. The vast majority of the over 5,000 exoplanets cataloged have been discovered through the slight dimming of starlight caused by these planets as they pass in front of their host stars.

By observing how a star’s light changes when a planet transits in front of it from our vantage point on Earth, light curves can be constructed. The brightness slightly decreases when the planet crosses in front of the star, reaching a minimum when the planet is fully in front of the star. The brightness then gradually increases as the planet moves away from the star, bringing the transit to an end.

Challenges and Innovations

Astronomers often find that light curves are not as straightforward as they appear. In addition to the dips caused by planetary transits, scientists have observed smaller, more complex dips. The prevailing theory is that these dips are caused by “star spots,” similar to sunspots that adorn the surface of our Sun.

The new “Twinkling Star Process” can identify the number, locations, and brightness or darkness of star spots. This information significantly aids in understanding the characteristics of stars and their associated planets.

Future Applications

Currently, the “Twinkling Star Process” can only be used in visible light, making it inapplicable to observations conducted by the James Webb Space Telescope. However, the Pandora satellite, expected to launch later this year, will conduct observations in multiple wavelengths, allowing scientists to use this new model again when data collection begins.

Research shows that gaining more insight into a star’s properties can provide deeper information about the planet, enhancing the ability to explore signs of life on other planets, particularly in the search for water in planetary atmospheres.

Conclusion

Thanks to these new innovations, astronomers can uncover more about stars and the planets orbiting them, opening new horizons in astronomy. The “Twinkling Star Process” offers a powerful tool for better understanding the properties of stars and planets, thereby improving our ability to search for life in the universe.