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2021ApJ...913L..16C - Astrophys. J., 913, L16-L16 (2021/May-3)

Evidence for TiO in the atmosphere of the hot Jupiter HAT-P-65 b.


Abstract (from CDS):

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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanet atmospheres - Exoplanet atmospheric composition - Transmission spectroscopy - Hot Jupiters - Exoplanets

Simbad objects: 6

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