TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M Dwarf Stars

Joel D. Hartman; Daniel Bayliss; Rafael Brahm; Edward M. Bryant; Andrés Jordán; Gáspár Á. Bakos; Melissa J. Hobson; Elyar Sedaghati; Xavier Bonfils; Marion Cointepas; Jose Manuel Almenara; Khalid Barkaoui; Mathilde Timmermans; George Dransfield; Elsa Ducrot; Sebastián Zúñiga-Fernández; Matthew J. Hooton; Peter Pihlmann Pedersen; Francisco J. Pozuelos; Amaury H. M. J. Triaud; Michaël Gillon; Emmanuel Jehin; William C. Waalkes; Zachory K. Berta-Thompson; Steve B. Howell; Elise Furlan; George R. Ricker; Roland Vanderspek; Sara Seager; Joshua N. Winn; Jon M. Jenkins; David Rapetti; Karen A. Collins; David Charbonneau; Christopher J. Burke; David R. Rodriguez

arXiv · 2407.07187

TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M Dwarf Stars

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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 M_J, a radius of 0.744 +- 0.017 R_J, and an orbital period of 3.4717 d. It transits a mid-M dwarf star with a mass of 0.442 +- 0.025 M_S and a radius of 0.4250 +- 0.0091 R_S. 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 M_S. The planet TIC 46432937 b is a warm Super-Jupiter with a mass of 3.20 +- 0.11 M_J and radius of 1.188 +- 0.030 R_J. 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 M_S and a radius of 0.5299 +- 0.0091 R_S. 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 M_J, equilibrium temperature below 1000 K).

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Joel D. Hartman, Daniel Bayliss, Rafael Brahm, Edward M. Bryant, Andrés Jordán, Gáspár Á. Bakos, Melissa J. Hobson, Elyar Sedaghati, Xavier Bonfils, Marion Cointepas, Jose Manuel Almenara, Khalid Barkaoui, Mathilde Timmermans, George Dransfield, Elsa Ducrot, Sebastián Zúñiga-Fernández, Matthew J. Hooton, Peter Pihlmann Pedersen, Francisco J. Pozuelos, Amaury H. M. J. Triaud, Michaël Gillon, Emmanuel Jehin, William C. Waalkes, Zachory K. Berta-Thompson, Steve B. Howell, Elise Furlan, George R. Ricker, Roland Vanderspek, Sara Seager, Joshua N. Winn, Jon M. Jenkins, David Rapetti, Karen A. Collins, David Charbonneau, Christopher J. Burke, David R. Rodriguez. 2024-07-09. TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M Dwarf Stars. https://arxiv.org/abs/2407.07187

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