LRG-BEASTS: Evidence for clouds in the transmission spectrum of HATS-46 b
arXiv:2303.07381 · doi:10.1093/mnras/stad779
Abstract
We have performed low-resolution ground-based spectroscopy of HATS-46 b in transmission, using the EFOSC2 instrument on the ESO New Technology Telescope (NTT). HATS-46 b is a highly-inflated exoplanet that is a prime target for transmission spectroscopy, having a Jupiter-like radius (0.95 R) but a much lower mass (0.16 M). It orbits a G-type star with a 4.7 d period, giving an equilibrium temperature of 1100 K. We observed one transit of HATS-46 b with the NTT, with the time-series spectra covering a wavelength range of 3900 - 9000 Angstrom at a resolution of . We achieved a remarkably precise transmission spectrum of 1.03 photon noise, with a median uncertainty of ppm for Angstrom wide bins, despite the relative faintness of the host star with . The transmission spectrum does not show strong absorption features and retrievals favour a cloudy model, ruling out a clear atmosphere with confidence. We also place a conservative upper limit on the sodium abundance under the alternative scenario of a clear atmosphere. This is the eighth planet in the LRG-BEASTS survey, which uses 4m-class telescopes such as the NTT to obtain low-resolution transmission spectra of hot Jupiters with precisions of around one atmospheric scale height.
arXiv comment10 pages, 7 figures, 4 tables, accepted for publication in MNRAS
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