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New Study Finds Flares From Host Stars Can Lead to a Decreased Ability to Sustain Life

An artist's conception of HD 209458 b, an exoplanet whose atmosphere is being torn off at more than 35,000 km/hour by the radiation of its close-by parent star. This hot Jupiter was the first alien world discovered via the transit method, and the first planet to have its atmosphere studied. Image credit: NASA/European Space Agency/Alfred Vidal-Madjar (Institut d'Astrophysique de Paris, CNRS).

Planetary habitability, defined by a planet’s ability to sustain liquid water on its surface, is one of the most important concepts in exoplanet science

Press Release

In a new study, researchers led by Research Scientist Dimitra Atri of the Center for Space Science at NYU Abu Dhabi (NYUAD), identified which stars were most likely to host habitable exoplanets based on the calculated erosion rates of the planetary atmospheres. 

In the paper titled Stellar flares versus luminosity: XUV-induced atmospheric escape and planetary habitability, published in the journal Monthly Notices of Royal Astronomical Society: Letters, Atri and graduate student Shane Carberry Mogan present the process of analyzing flare emission data from NASA’s TESS (Transiting Exoplanet Survey Satellite) observatory. 

It was found that more frequent, lower energy flares had a greater impact on an exoplanet’s atmosphere than less frequent, higher energy flares. The researchers also determined how different types of stars emit extreme ultraviolet radiation (XUV) through stellar flares, and how nearby planets are affected.

The ability to sustain an atmosphere is one of the most important requirements for a habitable planet. This research provides new insights into the habitability of exoplanets, as the effects of stellar activity were not well understood. This study also highlights the need for better numerical modeling of atmospheric escape – how planets release atmospheric gases into space – as it can lead to the erosion of atmosphere and the diminishment of the planet’s habitability.

“Given the close proximity of exoplanets to host stars, it is vital to understand how space weather events tied to those stars can affect the habitability of the exoplanet. The next research step would be to expand our data set to analyze stellar flares from a larger variety of stars to see the long-term effects of stellar activity, and to identify more potentially habitable exoplanets.”

Research Scientist Dimitra Atri

Researchers from the Center for Space Science will soon study a similar phenomenon using data from the Emirates Mars Mission to better understand how Mars lost a majority of its atmosphere. 

About NYU Abu Dhabi

NYU Abu Dhabi is the first comprehensive liberal arts and research campus in the Middle East to be operated abroad by a major American research university. NYU Abu Dhabi has integrated a highly selective undergraduate curriculum across the disciplines with a world center for advanced research and scholarship. The university enables its students in the sciences, engineering, social sciences, humanities, and arts to succeed in an increasingly interdependent world and advance cooperation and progress on humanity’s shared challenges. NYU Abu Dhabi’s high-achieving students have come from over 115 countries and speak over 115 languages. Together, NYU's campuses in New York, Abu Dhabi, and Shanghai form the backbone of a unique global university, giving faculty and students opportunities to experience varied learning environments and immersion in other cultures at one or more of the numerous study-abroad sites NYU maintains on six continents.

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