TOI 4201 b and TOI 5344 b: Discovery of Two Transiting Giant Planets around M-dwarf Stars and Revised Parameters for Three Others

October 2023 • 2023AJ....166..163H

Authors • Hartman, J. D. • Bakos, G. Á. • Csubry, Z. • Howard, A. W. • Isaacson, H. • Giacalone, S. • Chontos, A. • Narita, N. • Fukui, A. • de Leon, J. P. • Watanabe, N. • Mori, M. • Kagetani, T. • Fukuda, I. • Kawai, Y. • Ikoma, M. • Palle, E. • Murgas, F. • Esparza-Borges, E. • Parviainen, H. • Bouma, L. G. • Cointepas, M. • Bonfils, X. • Almenara, J. M. • Collins, Karen A. • Collins, Kevin I. • Relles, Howard M. • Barkaoui, Khalid • Schwarz, Richard P. • Mourad, Ghachoui • Timmermans, Mathilde • Dransfield, Georgina • Burdanov, Artem • de Wit, Julien • Jehin, Emmanuël • Triaud, Amaury H. M. J. • Gillon, Michaël • Benkhaldoun, Zouhair • Horne, Keith • Sefako, Ramotholo • Jordán, A. • Brahm, R. • Suc, V. • Howell, Steve B. • Furlan, E. • Schlieder, J. E. • Ciardi, D. • Barclay, T. • Gonzales, E. J. • Crossfield, I. • Dressing, C. D. • Goliguzova, M. • Tatarnikov, A. • Ricker, George R. • Vanderspek, Roland • Latham, David W. • Seager, S. • Winn, Joshua N. • Jenkins, Jon M. • Striegel, Stephanie • Shporer, Avi • Vanderburg, Andrew • Levine, Alan M. • Kostov, Veselin B. • Watanabe, David

Abstract • We present the discovery from the TESS mission of two giant planets transiting M-dwarf stars: TOI 4201 b and TOI 5344 b. We also provide precise radial velocity measurements and updated system parameters for three other M dwarfs with transiting giant planets: TOI 519, TOI 3629, and TOI 3714. We measure planetary masses of 0.525 ± 0.064 M _J, 0.243 ± 0.020 M _J, 0.689 ± 0.030 M _J, 2.57 ± 0.15 M _J, and 0.412±0.040 M _J for TOI 519 b, TOI 3629 b, TOI 3714 b, TOI 4201 b, and TOI 5344 b, respectively. The corresponding stellar masses are 0.372 ± 0.018 M _☉, 0.635 ± 0.032 M _☉, 0.522 ± 0.028 M _☉, 0.626 ± 0.033 M _☉, and 0.612 ± 0.034 M _☉. All five hosts have supersolar metallicities, providing further support for recent findings that, like for solar-type stars, close-in giant planets are preferentially found around metal-rich M-dwarf host stars. Finally, we describe a procedure for accounting for systematic errors in stellar evolution models when those models are included directly in fitting a transiting planet system.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2023AJ....166..163H
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/acf56e/pdf
• PREPRINT http://arxiv.org/abs/2307.06809
• DATA https://archive.gemini.edu/searchform/publication=2023AJ....166..163H
• DATA https://doi.org/10.17909/1cab-7p42
• ELECTR https://doi.org/10.3847%2F1538-3881%2Facf56e