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Illustration of a planet passing in front of the star. Star has flares and unoccupied star spots. Why does any of this matter for transit spectroscopy? The transit light source effect - Transmission spectroscopy assumes an e out-of-transit, disk-integrated spectrum of the host star can be subtracted to isolate the spectrum of the planet Any difference between the spectrum of the transit chord and the rest of the star leads to contamination, including: 1) occulted starspots 2) unocculted starspots 3) time variability such as flares

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Illustration of a planet passing in front of the star. Star has flares and unoccupied star spots. Why does any of this matter for transit spectroscopy? The transit light source effect - Transmission spectroscopy assumes an e out-of-transit, disk-integrated spectrum of the host star can be subtracted to isolate the spectrum of the planet Any difference between the spectrum of the transit chord and the rest of the star leads to contamination, including: 1) occulted starspots 2) unocculted starspots 3) time variability such as flares
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Kelly Lepo (kellylepo@astrodon.social)'s status on Wednesday, 13-Sep-2023 01:41:57 JST Kelly Lepo
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One thing to come out of several talks this morning, is the importance of stellar flares in the Trappist 1 system.
The red dwarf in the Trappist 1 system has several flares per day that are similar to flares that happen once per month on the Sun. This tends to complicate planet transit methods and can cause false detections of molecules if you are not careful.
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In conversation about a year ago from astrodon.social permalink