Detection of TiO and Na in the atmosphere of the hot Jupiter HAT-P-65b

Top: final transmission spectrum and retrieved models for HAT-P-65b. The white circles refer to the data. The blue line and shading show the results from the full retrieval, while the red line and shading from the K-muted retrieval. Bottom: retrieved temperature-pressure (T-P) profiles and mass fractions for the full retrieval (left two) and K-muted retrieval (right two), respectively.
Top: HAT-P-65b transmission spectrum and retrieved models; data (white) and results from the full (blue) and K-muted (red) retrievals. Bottom: retrieved temperature-pressure profiles and mass fractions for the full (lef) and K-muted (right) retrievals.
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Authors
G. Chen
Chinese Academy of Sciences
F. Yan
Institut für Astrophysik - Georg-August-Universität Göttingen
References
2021 ApJL 913 L16

We present the low-resolution transmission spectra of the puffy hot Jupiter HAT-P-65b (0.53 MJup, 1.89 RJup, Teq = 1930 K), based on two transits observed using the OSIRIS spectrograph on the 10.4 m Gran Telescopio CANARIAS. The transmission spectra of the two nights are consistent, covering the wavelength range 517–938 nm and consisting of mostly 5 nm spectral bins. We perform equilibrium-chemistry spectral retrieval analyses on the jointly fitted transmission spectrum and obtain an equilibrium temperature of 1645 (-244+255) K and a cloud coverage of 36 (-17+23) %, revealing a relatively clear planetary atmosphere. Based on free-chemistry retrieval, we report strong evidence for titanium oxide (TiO). Additional individual analyses in each night reveal weak-to-moderate evidence for TiO in both nights, but moderate evidence for Na or VO only in one of the nights. Future high-resolution Doppler spectroscopy as well as emission observations will help confirm the presence of TiO and constrain its role in shaping the vertical thermal structure of HAT-P-65b's atmosphere.

News type
Research news
Scope
Science and Technology
Severo Ochoa
SO Research
Astrophysics
General public
Undergraduate
Scientists
Exoplanetary Systems & Solar System (SEYSS)
SEVERO OCHOA

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