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- W3202132023 abstract "Abstract The M3V dwarf star L 98-59 hosts three small ( R < 1.6 R ⊕ ) planets. The host star is bright ( K = 7.1) and nearby (10.6 pc), making the system a prime target for follow-up characterization with the Hubble Space Telescope (HST) and the upcoming James Webb Space Telescope (JWST). Herein, we use simulated transmission spectroscopy to evaluate the detectability of spectral features with HST and JWST assuming diverse atmospheric scenarios (e.g., atmospheres dominated by H 2 , H 2 O, CO 2 , or O 2 ). We find that H 2 O and CH 4 present in a low mean molecular weight atmosphere could be detected with HST in one transit for the two outermost planets, while H 2 O in a clear steam atmosphere could be detected in six transits or fewer with HST for all three planets. We predict that observations using JWST/NIRISS would be capable of detecting a clear steam atmosphere in one transit for each planet and H 2 O absorption in a hazy steam atmosphere in two transits or less. In a clear, desiccated atmosphere, O 2 absorption may be detectable for all three planets with NIRISS. If the L 98-59 planets possess a clear, Venus-like atmosphere, NIRSpec could detect CO 2 within 26 transits for each planet, but the presence of H 2 SO 4 clouds would significantly suppress CO 2 absorption. The L 98-59 system is an excellent laboratory for comparative planetary studies of transiting multiplanet systems, and observations of the system via HST and JWST would present a unique opportunity to test the accuracy of the models presented in this study." @default.
- W3202132023 created "2021-10-11" @default.
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- W3202132023 date "2021-09-29" @default.
- W3202132023 modified "2023-09-23" @default.
- W3202132023 title "L 98-59: A Benchmark System of Small Planets for Future Atmospheric Characterization" @default.
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