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The GAPS Programme at TNG XXXIII. HARPS-N detects multiple atomic species in emission from the dayside of KELT-20b
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(2022) The GAPS Programme at TNG XXXIII. HARPS-N detects multiple atomic species in emission from the dayside of KELT-20b. Astronomy & Astrophysics, 663 . A141. doi:10.1051/0004-6361/202142768 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/202142768
Abstract
The detection of lines in emission in planetary atmospheres provides direct evidence of temperature inversion. We confirm the trend of ultra-hot Jupiters orbiting A-type stars that show temperature inversions on their daysides by detecting metals emission lines in the dayside of KELT-20b. We first detected the planetary emission by using the G2 stellar mask of the HARPS-N pipeline, which is mainly composed of neutral iron lines, as a template. Using neutral iron templates, we performed a retrieval of the atmospheric temperature-pressure profile of the planet, confirming a thermal inversion. Then we created models of planetary emission of different species using the retrieved inverted temperature-pressure profile. By using the cross-correlation technique, we detected Fe I, Fe II, and Cr I at signal-to-noise ratio levels of 7.1, 3.9, and 3.6, respectively. The latter was detected in emission in the atmosphere of an exoplanet for the first time. Contrary to Fe I, Fe II and Cr I were detected only after the occultation and not before, hinting at different atmospheric properties in view during the pre- and post-occultation orbital phases. A further retrieval of the temperature-pressure profile performed independently during the pre- and post-occultation phases, while not highly significant, points to a steeper thermal inversion in the post-occultation.
| Item Type: | Journal Article | ||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||
| Publisher: | EDP Sciences | ||||||
| ISSN: | 0004-6361 | ||||||
| Official Date: | 26 July 2022 | ||||||
| Dates: |
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| Volume: | 663 | ||||||
| Article Number: | A141 | ||||||
| DOI: | 10.1051/0004-6361/202142768 | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Copyright Holders: | © F. Borsa et al. 2022 | ||||||
| Date of first compliant deposit: | 22 August 2022 | ||||||
| Date of first compliant Open Access: | 22 August 2022 |
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