PEPSI Investigation, Retrieval, and Atlas of Numerous Giant Atmospheres (PIRANGA). I. The Ubiquity of Fe I Emission and Inversions in Ultra Hot Jupiter Atmospheres
We present high-resolution optical emission spectroscopy observations of the ultra hot Jupiters (UHJs) TOI-1431 b and TOI-1518 b using the PEPSI spectrograph on the LBT. We detect emission lines from Fe I with a significance of 5.40$\sigma$ and 7.85$\sigma$ for TOI 1431 b and TOI-1518 b, respectivel...
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Main Authors | , , , , , , |
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Format | Journal Article |
Language | English |
Published |
12.07.2024
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Subjects | |
Online Access | Get full text |
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Summary: | We present high-resolution optical emission spectroscopy observations of the
ultra hot Jupiters (UHJs) TOI-1431 b and TOI-1518 b using the PEPSI
spectrograph on the LBT. We detect emission lines from Fe I with a significance
of 5.40$\sigma$ and 7.85$\sigma$ for TOI 1431 b and TOI-1518 b, respectively.
We also detect Cr I emission from TOI-1431 b at $4.23\sigma$. For TOI-1518 b,
we tentatively detect Ni I, Fe I, and Mg I, as well as possibly CaH, at
significance levels ranging from $3-4\sigma$. Detection of emission lines
indicates that both planets possess temperature inversions in their
atmospheres, providing further evidence of the ubiquity of stratospheres among
UHJs. By analyzing the population of hot Jupiters, we compare models that
predict the distribution of planets in the temperature-gravity space, and find
a recent global circulation model suite from Roth et al. (2024) provides a
reasonable match, if TiO is not included in the models. The ubiquity of strong
Fe I emission lines among UHJs, together with the paucity of detections of TiO,
suggest that atomic iron is the dominant optical opacity source in their
atmospheres and can be responsible for the inversions. |
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DOI: | 10.48550/arxiv.2407.09643 |