Context. Exoplanet atmospheres are the key to understanding the nature of exoplanets. To this end, transit spectrophotometry provides us opportunities to investigate the physical properties and chemical compositions of exoplanet atmospheres. Aims. We aim to detect potential atmospheric signatures in 12 gaseous giant exoplanets using transit spectrophotometry and we try to constrain their atmospheric properties. Methods. The targets of interest were observed using transit spectrophotometry with the GTC OSIRIS instrument. We estimated the transit parameters and obtained the optical transmission spectra of the target planets using a Bayesian framework. We analyzed the spectral features in the transmission spectra based on atmospheric retrievals. Results. Most of the observed transmission spectra were found to be featureless, with only the spectrum of CoRoT-1b showing strong evidence for atmospheric features. However, in combination with the previously published near-infrared transmission spectrum, we found multiple interpretations for the atmosphere of CoRoT-1b due to the lack of decisive evidence for alkali metals or optical absorbers. Conclusions. Featureless spectra are not necessarily indicative of cloudy atmospheres if they poorly constrain the altitudes of cloud decks. Precise constraints on the models of hazes and clouds strongly depend on the significance of the observed spectral features. Further investigations on these exoplanets, especially CoRoT-1b, are required to confirm the properties of their atmospheres.

C. Jiang

G. Chen

E. Pallé

F. Murgas

H. Parviainen

Y. Ma

Astronomy and Astrophysics

ASTRONOMY & ASTROPHYSICS 是一本国际期刊，独立于用于获得结果的技术发表关于天文学和天体物理学（理论、观测和仪器）各个方面的论文。

Astronomy and Astrophysics is an international journal that focuses on various aspects of astronomy and astrophysics, including theory, observation, and instrumentation. The journal publishes high-quality academic papers independently of the techniques used to obtain research results.

《Astronomy and Astrophysics》是一本国际性期刊，专注于天文学和天体物理学的各个方面，包括理论、观测和仪器技术。该期刊独立于用于获得研究结果的技术，发表高质量的学术论文。

Category	Quartile
物理与天体物理	2
物理与天体物理, 天文与天体物理	2

Featureless transmission spectra of 12 giant exoplanets observed by GTC/OSIRIS

ivySCI AI Smartly Parses PDF, Answers Researchers' Questions, and Helps You Understand Papers in Seconds

Journal Info