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

doi:10.3847/1538-3881/ad6f07

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. TriaudMichaël 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

^*Corresponding author for this work

Physics and Astronomy

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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 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).

Original language	English
Article number	202
Number of pages	19
Journal	The Astronomical Journal
Volume	168
Issue number	5
Early online date	10 Oct 2024
DOIs	https://doi.org/10.3847/1538-3881/ad6f07
Publication status	Published - 1 Nov 2024

Keywords

Exoplanet systems
M dwarf stars
Extrasolar gaseous giant planets
Transit photometry
Radial velocity
Space telescopes
Exoplanet astronomy

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Hartman, J. D., Bayliss, D., Brahm, R., Bryant, E. M., Jordán, A., Bakos, G. Á., Hobson, M. J., Sedaghati, E., Bonfils, X., Cointepas, M., Almenara, J. M., Barkaoui, K., Timmermans, M., Dransfield, G., Ducrot, E., Zúñiga-Fernández, S., Hooton, M. J., Pedersen, P. P., Pozuelos, F. J., ... Rodriguez, D. R. (2024). TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M-dwarf Stars. The Astronomical Journal, 168(5), Article 202. https://doi.org/10.3847/1538-3881/ad6f07

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title = "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 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 MJ, a radius of 0.744 ± 0.017 RJ, 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 MJ and radius of 1.188 ± 0.030 RJ. The planet{\textquoteright}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 MJ, equilibrium temperature below 1000 K).",

keywords = "Exoplanet systems, M dwarf stars, Extrasolar gaseous giant planets, Transit photometry, Radial velocity, Space telescopes, Exoplanet astronomy",

author = "Hartman, {Joel D.} and Daniel Bayliss and Rafael Brahm and Bryant, {Edward M.} and Andr{\'e}s Jord{\'a}n and Bakos, {G{\'a}sp{\'a}r {\'A}.} and Hobson, {Melissa J.} and Elyar Sedaghati and Xavier Bonfils and Marion Cointepas and Almenara, {Jose Manuel} and Khalid Barkaoui and Mathilde Timmermans and George Dransfield and Elsa Ducrot and Sebasti{\'a}n Z{\'u}{\~n}iga-Fern{\'a}ndez and Hooton, {Matthew J.} and Pedersen, {Peter Pihlmann} and Pozuelos, {Francisco J.} and Triaud, {Amaury H. M. J.} and Micha{\"e}l Gillon and Emmanuel Jehin and Waalkes, {William C.} and Berta-Thompson, {Zachory K.} and Howell, {Steve B.} and Elise Furlan and Ricker, {George R.} and Roland Vanderspek and Sara Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and David Rapetti and Collins, {Karen A.} and David Charbonneau and Burke, {Christopher J.} and Rodriguez, {David R.}",

year = "2024",

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day = "1",

doi = "10.3847/1538-3881/ad6f07",

language = "English",

volume = "168",

journal = "The Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5",

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Hartman, JD, Bayliss, D, Brahm, R, Bryant, EM, Jordán, A, Bakos, GÁ, Hobson, MJ, Sedaghati, E, Bonfils, X, Cointepas, M, Almenara, JM, Barkaoui, K, Timmermans, M, Dransfield, G, Ducrot, E, Zúñiga-Fernández, S, Hooton, MJ, Pedersen, PP, Pozuelos, FJ, Triaud, AHMJ, Gillon, M, Jehin, E, Waalkes, WC, Berta-Thompson, ZK, Howell, SB, Furlan, E, Ricker, GR, Vanderspek, R, Seager, S, Winn, JN, Jenkins, JM, Rapetti, D, Collins, KA, Charbonneau, D, Burke, CJ & Rodriguez, DR 2024, 'TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M-dwarf Stars', The Astronomical Journal, vol. 168, no. 5, 202. https://doi.org/10.3847/1538-3881/ad6f07

TY - JOUR

T1 - TOI 762 A b and TIC 46432937 b

T2 - Two Giant Planets Transiting M-dwarf Stars

AU - Hartman, Joel D.

AU - Bayliss, Daniel

AU - Brahm, Rafael

AU - Bryant, Edward M.

AU - Jordán, Andrés

AU - Bakos, Gáspár Á.

AU - Hobson, Melissa J.

AU - Sedaghati, Elyar

AU - Bonfils, Xavier

AU - Cointepas, Marion

AU - Almenara, Jose Manuel

AU - Barkaoui, Khalid

AU - Timmermans, Mathilde

AU - Dransfield, George

AU - Ducrot, Elsa

AU - Zúñiga-Fernández, Sebastián

AU - Hooton, Matthew J.

AU - Pedersen, Peter Pihlmann

AU - Pozuelos, Francisco J.

AU - Triaud, Amaury H. M. J.

AU - Gillon, Michaël

AU - Jehin, Emmanuel

AU - Waalkes, William C.

AU - Berta-Thompson, Zachory K.

AU - Howell, Steve B.

AU - Furlan, Elise

AU - Ricker, George R.

AU - Vanderspek, Roland

AU - Seager, Sara

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Rapetti, David

AU - Collins, Karen A.

AU - Charbonneau, David

AU - Burke, Christopher J.

AU - Rodriguez, David R.

PY - 2024/11/1

Y1 - 2024/11/1

N2 - 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 MJ, a radius of 0.744 ± 0.017 RJ, 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 MJ and radius of 1.188 ± 0.030 RJ. 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 MJ, equilibrium temperature below 1000 K).

AB - 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 MJ, a radius of 0.744 ± 0.017 RJ, 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 MJ and radius of 1.188 ± 0.030 RJ. 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 MJ, equilibrium temperature below 1000 K).

KW - Exoplanet systems

KW - M dwarf stars

KW - Extrasolar gaseous giant planets

KW - Transit photometry

KW - Radial velocity

KW - Space telescopes

KW - Exoplanet astronomy

U2 - 10.3847/1538-3881/ad6f07

DO - 10.3847/1538-3881/ad6f07

M3 - Article

SN - 0004-6256

VL - 168

JO - The Astronomical Journal

JF - The Astronomical Journal

IS - 5

M1 - 202

ER -

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

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