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

November 2024 • 2024AJ....168..202H

Authors • 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.

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 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).

Links

• PREPRINT http://arxiv.org/abs/2407.07187
• ELECTR https://doi.org/10.3847/1538-3881/ad6f07
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2024AJ....168..202H
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/ad6f07/pdf
• DATA http://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/202
• DATA http://archive.eso.org/bin/ads2eso?2024AJ....168..202H
• DATA https://archive.gemini.edu/searchform/publication=2024AJ....168..202H
• DATA https://doi.org/10.17909/e3cp-9907
• DATA https://doi.org/10.26134/ExoFOP5
• DATA https://irsa.ipac.caltech.edu/bibdata/2024/H/2024AJ....168..202H.html