Paul M. Sutter is a research professor in astrophysics at SUNY Stony Brook University and the Flatiron Institute in New York City. He regularly appears on TV and podcasts, including 'Ask a Spaceman.' He is the author of two books, 'Your Place in the Universe' and 'How to Die in Space,' and is a regular contributor to Space.
The first super-Earth astronomers ever discovered has given off strange signals for nearly two decades, and scientists may have finally figured out why.
Perhaps the most puzzling aspect of the planet, as pointed out in a paper accepted in September to the Astrophysical Journal Letters, is the nature of its transit signal. This is the light visible from Earth when 55 Cancri e crosses across the face of its parent star, making a tiny eclipse, and the light visible when the planet passes behind its star.
In the new study, the authors hypothesize that the planet's proximity to its star is causing it to outgas, meaning that giant volcanoes and thermal vents open up, spewing hot carbon-rich elements into the atmosphere. But the planet can't hold on to that atmosphere for long due to the extreme heat, and this gas eventually gets blown away, leaving the planet bare until the outgassing begins again.
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