تقرير
A temperature inversion with atomic iron in the ultra-hot dayside atmosphere of WASP-189b
| العنوان: | A temperature inversion with atomic iron in the ultra-hot dayside atmosphere of WASP-189b |
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| المؤلفون: | Yan, F., Pallé, E., Reiners, A., Molaverdikhani, K., Casasayas-Barris, N., Nortmann, L., Chen, G., Mollière, P., Stangret, M. |
| المصدر: | A&A 640, L5 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | Temperature inversion layers are predicted to be present in ultra-hot giant planet atmospheres. Although such inversion layers have recently been observed in several ultra-hot Jupiters, the chemical species responsible for creating the inversion remain unidentified. Here, we present observations of the thermal emission spectrum of an ultra-hot Jupiter, WASP-189b, at high spectral resolution using the HARPS-N spectrograph. Using the cross-correlation technique, we detect a strong Fe I signal. The detected Fe I spectral lines are found in emission, which is direct evidence of a temperature inversion in the planetary atmosphere. We further performed a retrieval on the observed spectrum using a forward model with an MCMC approach. When assuming a solar metallicity, the best-fit result returns a temperature of $4320_{-100}^{+120}$ K at the top of the inversion, which is significantly hotter than the planetary equilibrium temperature (2641 K). The temperature at the bottom of the inversion is determined as $2200_{-800}^{+1000}$ K. Such a strong temperature inversion is probably created by the absorption of atomic species like Fe I. Comment: 9 pages, 10 figures. Accepted for publication in Astronomy & Astrophysics, in press |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/202038294 |
| الوصول الحر: | http://arxiv.org/abs/2007.02716Test |
| رقم الانضمام: | edsarx.2007.02716 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/202038294 |
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