تقرير
A secondary atmosphere on the rocky exoplanet 55 Cancri e
| العنوان: | A secondary atmosphere on the rocky exoplanet 55 Cancri e |
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| المؤلفون: | Hu, Renyu, Bello-Arufe, Aaron, Zhang, Michael, Paragas, Kimberly, Zilinskas, Mantas, van Buchem, Christiaan, Bess, Michael, Patel, Jayshil, Ito, Yuichi, Damiano, Mario, Scheucher, Markus, Oza, Apurva V., Knutson, Heather A., Miguel, Yamila, Dragomir, Diana, Brandeker, Alexis, Demory, Brice-Olivier |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | Characterizing rocky exoplanets is a central endeavor of astronomy, and yet the search for atmospheres on rocky exoplanets has hitherto resulted in either tight upper limits on the atmospheric mass or inconclusive results. The 1.95-REarth and 8.8-MEarth planet 55 Cnc e, with a predominantly rocky composition and an equilibrium temperature of ~2000 K, may have a volatile envelope (containing molecules made from a combination of C, H, O, N, S, and P elements) that accounts for up to a few percent of its radius. The planet has been observed extensively with transmission spectroscopy, and its thermal emission has been measured in broad photometric bands. These observations disfavor a primordial H2/He-dominated atmosphere but cannot conclusively determine whether the planet has a secondary atmosphere. Here we report a thermal emission spectrum of the planet obtained by JWST's NIRCam and MIRI instruments from 4 to 12 {\mu}m. The measurements rule out the scenario where the planet is a lava world shrouded by a tenuous atmosphere made of vaporized rock, and indicate a bona fide volatile atmosphere likely rich in CO2 or CO. This atmosphere can be outgassed from and sustained by a magma ocean. Comment: Published online in Nature on May 8, 2024. https://www.nature.com/articles/s41586-024-07432-x. Authors' preprint |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41586-024-07432-x |
| URL الوصول: | http://arxiv.org/abs/2405.04744 |
| رقم الأكسشن: | edsarx.2405.04744 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41586-024-07432-x |
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