TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M Dwarf Stars
Abstract
We present the discovery of TOI 762 A b and TIC 46432937 b, two giant planets transiting M dwarf stars. Transits of both systems were first detected from observations by the NASA TESS mission, and the transiting objects are confirmed as planets through high-precision radial velocity (RV) observations carried out with VLT/ESPRESSO. TOI 762 A b is a warm sub-Saturn with a mass of 0.251 +- 0.042 MJ, a radius of 0.744 +- 0.017 RJ, and an orbital period of 3.4717 d. It transits a mid-M dwarf star with a mass of 0.442 +- 0.025 MS and a radius of 0.4250 +- 0.0091 RS. The star TOI 762 A has a resolved binary star companion TOI 762 B that is separated from TOI 762 A by 3.2" (~ 319 AU) and has an estimated mass of 0.227 +- 0.010 MS. The planet TIC 46432937 b is a warm Super-Jupiter with a mass of 3.20 +- 0.11 MJ and radius of 1.188 +- 0.030 RJ. The planet's orbital period is P = 1.4404 d, and it undergoes grazing transits of its early M dwarf host star, which has a mass of 0.563 +- 0.029 MS and a radius of 0.5299 +- 0.0091 RS. TIC 46432937 b is one of the highest mass planets found to date transiting an M dwarf star. TIC 46432937 b is also a promising target for atmospheric observations, having the highest Transmission Spectroscopy Metric or Emission Spectroscopy Metric value of any known warm Super-Jupiter (mass greater than 3.0 MJ, equilibrium temperature below 1000 K).
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