Abstract
We report the confirmation of a sub-Saturn-size exoplanet, TOI-1194 b, with a mass of about 0.456−0.051+0.055 M J, and a very low mass companion star with a mass of about 96.5 ± 1.5 M J, TOI-1251 B. Exoplanet candidates provided by the Transiting Exoplanet Survey Satellite (TESS) are suitable for further follow-up observations by ground-based telescopes with small and medium apertures. The analysis is performed based on data from several telescopes worldwide, including telescopes in the Sino-German multiband photometric campaign, which aimed at confirming TESS Objects of Interest (TOIs) using ground-based small-aperture and medium-aperture telescopes, especially for long-period targets. TOI-1194 b is confirmed based on the consistent periodic transit depths from the multiband photometric data. We measure an orbital period of 2.310644 ± 0.000001 days, the radius is 0.767−0.041+0.045 R J and the amplitude of the RV curve is 69.4−7.3+7.9 m s−1. TOI-1251 B is confirmed based on the multiband photometric and high-resolution spectroscopic data, whose orbital period is 5.963054−0.000001+0.000002 days, radius is 0.947−0.033+0.035 R J and amplitude of the RV curve is 9849−40+42 m s−1.
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