An illustration of an exoplanet. ESA / Hubble / M. Kornmesser.

Zeroing in on the Best Exoplanet Candidates for JWST

Out of thousands of potential exoplanets, researchers pinpoint the most promising for in-depth study by the James Webb Space Telescope.


Our galaxy is teeming with more than 5,000 confirmed exoplanets, a number poised to soar in the coming years. TESS (Transiting Exoplanet Survey Satellite) has already flagged over 4,000 promising candidates. With the impending 2026 launch of PLATO (PLAnetary Transits and Oscillations of stars), that count is expected to breach the 10,000 mark, revealing countless worlds that might harbor life.

But with such an abundance, how do we efficiently allocate our resources to probe these vast potentials?

A Thoughtful Approach

A recent submission on the arxiv pre-print server tackles this very question. Researchers are keen on pinpointing the top-tier exoplanet candidates that the James Webb Space Telescope’s (JWST) sophisticated spectroscopic cameras might deeply probe. The study not only aims to scout for potential life-bearing planets but also to grasp the diverse atmospheric compositions these exoplanets present.

By categorizing known and prospective exoplanets based on their radius and projected surface temperature, the team formulated an organized approach. From there, they ranked these celestial bodies according to their transmission spectroscopy metric (TSM) and emission spectroscopy metric (ESM) — essentially, those exoplanets most likely to reveal detectable spectra.


However, simply possessing strong spectral signals isn’t enough. The team fine-tuned their selection further based on which spectra can realistically be detected with our current observational tools.

The Cream of the Crop

Of the 103 TESS-championed candidates, subsequent reviews via the TESS Follow-up Observation Program validated 14. These represent the crème de la crème for JWST’s atmospheric analysis.

This targeted list will inevitably grow as we unearth more exoplanet candidates and deepen our observations. Yet, it provides an invaluable foundation. Given the high demand for JWST’s observation time, narrowing down to these 14 prime candidates ensures optimized utilization of this powerful telescope.


Moreover, these studies set the stage for upcoming missions. They offer a foundational understanding of atmospheres, proving instrumental for future initiatives like the Atmospheric Remote-sensing Infrared Exoplanet Large-survey (ARIEL) set to launch in 2029.

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Written by Ivan Petricevic

I've been writing passionately about ancient civilizations, history, alien life, and various other subjects for more than eight years. You may have seen me appear on Discovery Channel's What On Earth series, History Channel's Ancient Aliens, and Gaia's Ancient Civilizations among others.

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