TOI-2084 b and TOI-4184 b: two new sub-Neptunes around M dwarf stars

K. Barkaoui; M. Timmermans; A. Soubkiou; B.~V. Rackham; A.~J. Burgasser; J. Chouqar; F.~J. Pozuelos; K.~A. Collins; S.~B. Howell; R. Simcoe; C. Melis; K.~G. Stassun; J. Tregloan-Reed; M. Cointepas; M. Gillon; X. Bonfils; E. Furlan; C.~L. Gnilka; J.~M. Almenara; R. Alonso; Z. Benkhaldoun; M. Bonavita; F. Bouchy; A. Burdanov; P. Chinchilla; F. Davoudi; L. Delrez; O. Demangeon; M. Dominik; B. -O. Demory; J. de Wit; G. Dransfield; E. Ducrot; A. Fukui; T.~C. Hinse; M.~J. Hooton; E. Jehin; J.~M. Jenkins; U.~G. Jørgensen; D.~W. Latham; L. Garcia; S. Carrazco-Gaxiola; M. Ghachoui; Y. Gómez Maqueo Chew; M.~N. Günther; J. McCormac; F. Murgas; C.~A. Murray; N. Narita; P. Niraula; P.~P. Pedersen; D. Queloz; R. Rebolo-López; G. Ricker; L. Sabin; S. Sajadian; N. Schanche; R.~P. Schwarz; S. Seager; D. Sebastian; R. Sefako; S. Sohy; J. Southworth; G. Srdoc; S.~J. Thompson; A.~H.~M.~J. Triaud; R. Vanderspek; R.~D. Wells; J.~N. Winn; S. Zúñiga-Fernández

doi:10.1051/0004-6361/202346838

TOI-2084 b and TOI-4184 b: two new sub-Neptunes around M dwarf stars

K. Barkaoui^*
, M. Timmermans
, A. Soubkiou
, B.~V. Rackham
, A.~J. Burgasser
, J. Chouqar
, F.~J. Pozuelos
, K.~A. Collins
, S.~B. Howell
, R. Simcoe
, C. Melis
, K.~G. Stassun
, J. Tregloan-Reed
, M. Cointepas
, M. Gillon
, X. Bonfils
, E. Furlan
, C.~L. Gnilka
, J.~M. Almenara
, R. Alonso

Z. Benkhaldoun, M. Bonavita, F. Bouchy, A. Burdanov, P. Chinchilla, F. Davoudi, L. Delrez, O. Demangeon, M. Dominik, B. -O. Demory, J. de Wit, G. Dransfield, E. Ducrot, A. Fukui, T.~C. Hinse, M.~J. Hooton, E. Jehin, J.~M. Jenkins, U.~G. Jørgensen, D.~W. Latham, L. Garcia, S. Carrazco-Gaxiola, M. Ghachoui, Y. Gómez Maqueo Chew, M.~N. Günther, J. McCormac, F. Murgas, C.~A. Murray, N. Narita, P. Niraula, P.~P. Pedersen, D. Queloz, R. Rebolo-López, G. Ricker, L. Sabin, S. Sajadian, N. Schanche, R.~P. Schwarz, S. Seager, D. Sebastian, R. Sefako, S. Sohy, J. Southworth, G. Srdoc, S.~J. Thompson, A.~H.~M.~J. Triaud, R. Vanderspek, R.~D. Wells, J.~N. Winn, S. Zúñiga-Fernández

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro & -North/Alopeke high-resolution imaging, archival science images, and statistical validation packages to support the planetary interpretation. We performed a global analysis of multi-colour photometric data from TESS and ground-based facilities in order to derive the stellar and planetary physical parameters for each system. We find that TOI-2084 band TOI-4184 bare sub-Neptune-sized planets with radii of Rp = 2.47 ± 0.13R⊕ and Rp = 2.43 ± 0.21 R⊕, respectively. TOI-2084 b completes an orbit around its host star every 6.08 days, has an equilibrium temperature of T_eq = 527 ± 8 K and an irradiation of S_p = 12.8 ± 0.8 S⊕. Its host star is a dwarf of spectral M2.0 ± 0.5 at a distance of 114 pc with an effective temperature of T_eff = 3550 ± 50 K, and has a wide, co-moving M8 companion at a projected separation of 1400 au. TOI-4184 b orbits around an M5.0 ± 0.5 type dwarf star (K_mag = 11.87) each 4.9 days, and has an equilibrium temperature of T_eq = 412 ± 8 K and an irradiation of S_p = 4.8 ± 0.4 S⊕. TOI-4184 is a metal poor star ([Fe/H] = −0.27 ± 0.09 dex) at a distance of 69 pc with an effective temperature of T_eff = 3225 ± 75 K. Both planets are located at the edge of the sub-Jovian desert in the radius-period plane. The combination of the small size and the large infrared brightness of their host stars make these new planets promising targets for future atmospheric exploration with JWST.

Original language	English
Article number	A38
Number of pages	20
Journal	Astronomy & Astrophysics
Volume	677
Early online date	30 Aug 2023
DOIs	https://doi.org/10.1051/0004-6361/202346838
Publication status	Published - 1 Sept 2023

Keywords

Exoplanetary systems
Stars: TOI-2084 and TOI-4184
Photometric
Stars: low mass

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10.1051/0004-6361/202346838

Barkaoui-2023-TOI-2084b and TOI-4184b-A&A-677-A38-CCBY
Copyright © The Authors 2023. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Final published version, 16.8 MBLicence: CC BY

https://arxiv.org/abs/2306.15095Licence: Other

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H2020 MSCA ITN EJD 2019: H2020 MSCA ITN EJD 2019 CHAMELEON
Helling, C. (PI)
Joint Research Centre European Commission
1/06/20 → 31/05/24
Project: Standard

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Barkaoui, K., Timmermans, M., Soubkiou, A., Rackham, B. V., Burgasser, A. J., Chouqar, J., Pozuelos, F. J., Collins, K. A., Howell, S. B., Simcoe, R., Melis, C., Stassun, K. G., Tregloan-Reed, J., Cointepas, M., Gillon, M., Bonfils, X., Furlan, E., Gnilka, C. L., Almenara, J. M., ... Zúñiga-Fernández, S. (2023). TOI-2084 b and TOI-4184 b: two new sub-Neptunes around M dwarf stars. Astronomy & Astrophysics, 677, Article A38. https://doi.org/10.1051/0004-6361/202346838

@article{601fef35aee94262935e103a5bf79154,

title = "TOI-2084 b and TOI-4184 b: two new sub-Neptunes around M dwarf stars",

abstract = "We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro \& -North/Alopeke high-resolution imaging, archival science images, and statistical validation packages to support the planetary interpretation. We performed a global analysis of multi-colour photometric data from TESS and ground-based facilities in order to derive the stellar and planetary physical parameters for each system. We find that TOI-2084 band TOI-4184 bare sub-Neptune-sized planets with radii of Rp = 2.47 ± 0.13R⊕ and Rp = 2.43 ± 0.21 R⊕, respectively. TOI-2084 b completes an orbit around its host star every 6.08 days, has an equilibrium temperature of Teq = 527 ± 8 K and an irradiation of Sp = 12.8 ± 0.8 S⊕. Its host star is a dwarf of spectral M2.0 ± 0.5 at a distance of 114 pc with an effective temperature of Teff = 3550 ± 50 K, and has a wide, co-moving M8 companion at a projected separation of 1400 au. TOI-4184 b orbits around an M5.0 ± 0.5 type dwarf star (Kmag = 11.87) each 4.9 days, and has an equilibrium temperature of Teq = 412 ± 8 K and an irradiation of Sp = 4.8 ± 0.4 S⊕. TOI-4184 is a metal poor star ([Fe/H] = −0.27 ± 0.09 dex) at a distance of 69 pc with an effective temperature of Teff = 3225 ± 75 K. Both planets are located at the edge of the sub-Jovian desert in the radius-period plane. The combination of the small size and the large infrared brightness of their host stars make these new planets promising targets for future atmospheric exploration with JWST.",

keywords = "Exoplanetary systems, Stars: TOI-2084 and TOI-4184, Photometric, Stars: low mass",

author = "K. Barkaoui and M. Timmermans and A. Soubkiou and B.\textasciitilde{}V. Rackham and A.\textasciitilde{}J. Burgasser and J. Chouqar and F.\textasciitilde{}J. Pozuelos and K.\textasciitilde{}A. Collins and S.\textasciitilde{}B. Howell and R. Simcoe and C. Melis and K.\textasciitilde{}G. Stassun and J. Tregloan-Reed and M. Cointepas and M. Gillon and X. Bonfils and E. Furlan and C.\textasciitilde{}L. Gnilka and J.\textasciitilde{}M. Almenara and R. Alonso and Z. Benkhaldoun and M. Bonavita and F. Bouchy and A. Burdanov and P. Chinchilla and F. Davoudi and L. Delrez and O. Demangeon and M. Dominik and Demory, \{B. -O.\} and \{de Wit\}, J. and G. Dransfield and E. Ducrot and A. Fukui and T.\textasciitilde{}C. Hinse and M.\textasciitilde{}J. Hooton and E. Jehin and J.\textasciitilde{}M. Jenkins and U.\textasciitilde{}G. J{\o}rgensen and D.\textasciitilde{}W. Latham and L. Garcia and S. Carrazco-Gaxiola and M. Ghachoui and \{G{\'o}mez Maqueo Chew\}, Y. and M.\textasciitilde{}N. G{\"u}nther and J. McCormac and F. Murgas and C.\textasciitilde{}A. Murray and N. Narita and P. Niraula and P.\textasciitilde{}P. Pedersen and D. Queloz and R. Rebolo-L{\'o}pez and G. Ricker and L. Sabin and S. Sajadian and N. Schanche and R.\textasciitilde{}P. Schwarz and S. Seager and D. Sebastian and R. Sefako and S. Sohy and J. Southworth and G. Srdoc and S.\textasciitilde{}J. Thompson and A.\textasciitilde{}H.\textasciitilde{}M.\textasciitilde{}J. Triaud and R. Vanderspek and R.\textasciitilde{}D. Wells and J.\textasciitilde{}N. Winn and S. Z{\'u}{\~n}iga-Fern{\'a}ndez",

note = "Funding: The research leading to these results has received funding from the ARC grant for Concerted Research Actions, financed by the Wallonia-Brussels Federation. This research is in part funded by the European Union{\textquoteright}s Horizon 2020 research and innovation program (grants agreements n◦ 803193/BEBOP), and from the Science and Technology Facilities Council (STFC; grant n◦ ST/S00193X/1). U.G.J. gratefully acknowledges support from tthe European Union H2020-MSCA-ITN-2019 under grant No. 860470 (CHAMELEON). The authors acknowledge funding from the European Research Council under the ERC Grant Agreement n. 337591-ExTrA.",

year = "2023",

month = sep,

day = "1",

doi = "10.1051/0004-6361/202346838",

language = "English",

volume = "677",

journal = "Astronomy \& Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Barkaoui, K, Timmermans, M, Soubkiou, A, Rackham, BV, Burgasser, AJ, Chouqar, J, Pozuelos, FJ, Collins, KA, Howell, SB, Simcoe, R, Melis, C, Stassun, KG, Tregloan-Reed, J, Cointepas, M, Gillon, M, Bonfils, X, Furlan, E, Gnilka, CL, Almenara, JM, Alonso, R, Benkhaldoun, Z, Bonavita, M, Bouchy, F, Burdanov, A, Chinchilla, P, Davoudi, F, Delrez, L, Demangeon, O, Dominik, M, Demory, B-O, de Wit, J, Dransfield, G, Ducrot, E, Fukui, A, Hinse, TC, Hooton, MJ, Jehin, E, Jenkins, JM, Jørgensen, UG, Latham, DW, Garcia, L, Carrazco-Gaxiola, S, Ghachoui, M, Gómez Maqueo Chew, Y, Günther, MN, McCormac, J, Murgas, F, Murray, CA, Narita, N, Niraula, P, Pedersen, PP, Queloz, D, Rebolo-López, R, Ricker, G, Sabin, L, Sajadian, S, Schanche, N, Schwarz, RP, Seager, S, Sebastian, D, Sefako, R, Sohy, S, Southworth, J, Srdoc, G, Thompson, SJ, Triaud, AHMJ, Vanderspek, R, Wells, RD, Winn, JN & Zúñiga-Fernández, S 2023, 'TOI-2084 b and TOI-4184 b: two new sub-Neptunes around M dwarf stars', Astronomy & Astrophysics, vol. 677, A38. https://doi.org/10.1051/0004-6361/202346838

TY - JOUR

T1 - TOI-2084 b and TOI-4184 b

T2 - two new sub-Neptunes around M dwarf stars

AU - Barkaoui, K.

AU - Timmermans, M.

AU - Soubkiou, A.

AU - Rackham, B.~V.

AU - Burgasser, A.~J.

AU - Chouqar, J.

AU - Pozuelos, F.~J.

AU - Collins, K.~A.

AU - Howell, S.~B.

AU - Simcoe, R.

AU - Melis, C.

AU - Stassun, K.~G.

AU - Tregloan-Reed, J.

AU - Cointepas, M.

AU - Gillon, M.

AU - Bonfils, X.

AU - Furlan, E.

AU - Gnilka, C.~L.

AU - Almenara, J.~M.

AU - Alonso, R.

AU - Benkhaldoun, Z.

AU - Bonavita, M.

AU - Bouchy, F.

AU - Burdanov, A.

AU - Chinchilla, P.

AU - Davoudi, F.

AU - Delrez, L.

AU - Demangeon, O.

AU - Dominik, M.

AU - Demory, B. -O.

AU - de Wit, J.

AU - Dransfield, G.

AU - Ducrot, E.

AU - Fukui, A.

AU - Hinse, T.~C.

AU - Hooton, M.~J.

AU - Jehin, E.

AU - Jenkins, J.~M.

AU - Jørgensen, U.~G.

AU - Latham, D.~W.

AU - Garcia, L.

AU - Carrazco-Gaxiola, S.

AU - Ghachoui, M.

AU - Gómez Maqueo Chew, Y.

AU - Günther, M.~N.

AU - McCormac, J.

AU - Murgas, F.

AU - Murray, C.~A.

AU - Narita, N.

AU - Niraula, P.

AU - Pedersen, P.~P.

AU - Queloz, D.

AU - Rebolo-López, R.

AU - Ricker, G.

AU - Sabin, L.

AU - Sajadian, S.

AU - Schanche, N.

AU - Schwarz, R.~P.

AU - Seager, S.

AU - Sebastian, D.

AU - Sefako, R.

AU - Sohy, S.

AU - Southworth, J.

AU - Srdoc, G.

AU - Thompson, S.~J.

AU - Triaud, A.~H.~M.~J.

AU - Vanderspek, R.

AU - Wells, R.~D.

AU - Winn, J.~N.

AU - Zúñiga-Fernández, S.

N1 - Funding: The research leading to these results has received funding from the ARC grant for Concerted Research Actions, financed by the Wallonia-Brussels Federation. This research is in part funded by the European Union’s Horizon 2020 research and innovation program (grants agreements n◦ 803193/BEBOP), and from the Science and Technology Facilities Council (STFC; grant n◦ ST/S00193X/1). U.G.J. gratefully acknowledges support from tthe European Union H2020-MSCA-ITN-2019 under grant No. 860470 (CHAMELEON). The authors acknowledge funding from the European Research Council under the ERC Grant Agreement n. 337591-ExTrA.

PY - 2023/9/1

Y1 - 2023/9/1

N2 - We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro & -North/Alopeke high-resolution imaging, archival science images, and statistical validation packages to support the planetary interpretation. We performed a global analysis of multi-colour photometric data from TESS and ground-based facilities in order to derive the stellar and planetary physical parameters for each system. We find that TOI-2084 band TOI-4184 bare sub-Neptune-sized planets with radii of Rp = 2.47 ± 0.13R⊕ and Rp = 2.43 ± 0.21 R⊕, respectively. TOI-2084 b completes an orbit around its host star every 6.08 days, has an equilibrium temperature of Teq = 527 ± 8 K and an irradiation of Sp = 12.8 ± 0.8 S⊕. Its host star is a dwarf of spectral M2.0 ± 0.5 at a distance of 114 pc with an effective temperature of Teff = 3550 ± 50 K, and has a wide, co-moving M8 companion at a projected separation of 1400 au. TOI-4184 b orbits around an M5.0 ± 0.5 type dwarf star (Kmag = 11.87) each 4.9 days, and has an equilibrium temperature of Teq = 412 ± 8 K and an irradiation of Sp = 4.8 ± 0.4 S⊕. TOI-4184 is a metal poor star ([Fe/H] = −0.27 ± 0.09 dex) at a distance of 69 pc with an effective temperature of Teff = 3225 ± 75 K. Both planets are located at the edge of the sub-Jovian desert in the radius-period plane. The combination of the small size and the large infrared brightness of their host stars make these new planets promising targets for future atmospheric exploration with JWST.

AB - We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro & -North/Alopeke high-resolution imaging, archival science images, and statistical validation packages to support the planetary interpretation. We performed a global analysis of multi-colour photometric data from TESS and ground-based facilities in order to derive the stellar and planetary physical parameters for each system. We find that TOI-2084 band TOI-4184 bare sub-Neptune-sized planets with radii of Rp = 2.47 ± 0.13R⊕ and Rp = 2.43 ± 0.21 R⊕, respectively. TOI-2084 b completes an orbit around its host star every 6.08 days, has an equilibrium temperature of Teq = 527 ± 8 K and an irradiation of Sp = 12.8 ± 0.8 S⊕. Its host star is a dwarf of spectral M2.0 ± 0.5 at a distance of 114 pc with an effective temperature of Teff = 3550 ± 50 K, and has a wide, co-moving M8 companion at a projected separation of 1400 au. TOI-4184 b orbits around an M5.0 ± 0.5 type dwarf star (Kmag = 11.87) each 4.9 days, and has an equilibrium temperature of Teq = 412 ± 8 K and an irradiation of Sp = 4.8 ± 0.4 S⊕. TOI-4184 is a metal poor star ([Fe/H] = −0.27 ± 0.09 dex) at a distance of 69 pc with an effective temperature of Teff = 3225 ± 75 K. Both planets are located at the edge of the sub-Jovian desert in the radius-period plane. The combination of the small size and the large infrared brightness of their host stars make these new planets promising targets for future atmospheric exploration with JWST.

KW - Exoplanetary systems

KW - Stars: TOI-2084 and TOI-4184

KW - Photometric

KW - Stars: low mass

U2 - 10.1051/0004-6361/202346838

DO - 10.1051/0004-6361/202346838

M3 - Article

SN - 0004-6361

VL - 677

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A38

ER -

TOI-2084 b and TOI-4184 b: two new sub-Neptunes around M dwarf stars

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