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

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

The Astronomical Journal

Advertised on:
11
2024
Number of authors
36
IAC number of authors
1
Citations
2
Refereed citations
1
Description
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 observations carried out with Very Large Telescope/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 days. It transits a mid-M-dwarf star with a mass of 0.442 ± 0.025 M ☉ and a radius of 0.4250 ± 0.0091 R ☉. 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 ☉. 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 days, and it undergoes grazing transits of its early M-dwarf host star, which has a mass of 0.563 ± 0.029 M ☉ and a radius of 0.5299 ± 0.0091 R ☉. 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).