TOI-1846 b: A super-Earth in the radius valley orbiting a nearby M dwarf

Abderahmane Soubkiou; Khalid Barkaoui; Zouhair Benkhaldoun; Mourad Ghachoui; Jamila Chouqar; Benjamin V. Rackham; Adam Burgasser; Emma Softich; Enric Pallé; Akihiko Fukui; Norio Narita; Felipe Murgas; Steve B. Howell; Catherine A. Clark; Colin Littlefield; Allyson Bieryla; Andrew W. Boyle; David Ciardi; Karen Collins; Kevin I. Collins; Jerome De Leon; Courtney D. Dressing; Jason Eastman; Emma Esparza-Borges; Steven Giacalone; Holden Gill; Michaël Gillon; Kai Ikuta; J. M. Jenkins; Taiki Kagetani; David W. Latham; Mayuko Mori; Hannu Parviainen; Emily Pass; G. Ricker; Boris S. Safonov; Arjun B. Savel; Richard P. Schwarz; Sara Seager; Ivan A. Strakhov; Gregor Srdoc; R. Vanderspek; Noriharu Watanabe; Cristilyn N. Watkins; J. Winn

doi:10.1093/mnras/staf1030

TOI-1846 b: A super-Earth in the radius valley orbiting a nearby M dwarf

Abderahmane Soubkiou
, Khalid Barkaoui
, Zouhair Benkhaldoun
, Mourad Ghachoui
, Jamila Chouqar
, Benjamin V. Rackham
, Adam Burgasser
, Emma Softich
, Enric Pallé
, Akihiko Fukui
, Norio Narita
, Felipe Murgas
, Steve B. Howell
, Catherine A. Clark
, Colin Littlefield
, Allyson Bieryla
, Andrew W. Boyle
, David Ciardi
, Karen Collins
, Kevin I. Collins

Jerome De Leon, Courtney D. Dressing, Jason Eastman, Emma Esparza-Borges, Steven Giacalone, Holden Gill, Michaël Gillon, Kai Ikuta, J. M. Jenkins, Taiki Kagetani, David W. Latham, Mayuko Mori, Hannu Parviainen, Emily Pass, G. Ricker, Boris S. Safonov, Arjun B. Savel, Richard P. Schwarz, Sara Seager, Ivan A. Strakhov, Gregor Srdoc, R. Vanderspek, Noriharu Watanabe, Cristilyn N. Watkins, J. Winn

Astrophysical Sciences

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

Abstract

We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star () is located 47 pc away and has a radius of, a mass of and an effective temperature of K. Our analyses are based on joint modelling of Transiting Exoplanet Survey Satellite (TESS) photometry and ground-based multicolour photometric data. We also use high-resolution imaging and archival images, as well as statistical validation techniques to support the planetary system nature. We find that TOI-1846 b is a super-Earth sized planet with radius of and a predicted mass of (from the Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of (assuming a null Bond Albedo) and an incident flux of. Based on the two radial velocity (RV) measurements obtained with the Tillinghast Reflector Echelle Spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of 1.8, TOI-1846 b is within the sparsely populated radius range around 2 known as the radius gap (or radius valley). This discovery can contribute to refining the precise location of the radius valley for small planets orbiting bright M dwarfs, thereby enhancing our understanding of planetary formation and evolution processes.

Original language	English (US)
Pages (from-to)	3249-3268
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	541
Issue number	4
DOIs	https://doi.org/10.1093/mnras/staf1030
State	Published - Aug 1 2025

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planetary systems
planets and satellites
stars: individual: (TIC 198385543
TOI 1846)

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10.1093/mnras/staf1030

Cite this

Soubkiou, A., Barkaoui, K., Benkhaldoun, Z., Ghachoui, M., Chouqar, J., Rackham, B. V., Burgasser, A., Softich, E., Pallé, E., Fukui, A., Narita, N., Murgas, F., Howell, S. B., Clark, C. A., Littlefield, C., Bieryla, A., Boyle, A. W., Ciardi, D., Collins, K., ... Winn, J. (2025). TOI-1846 b: A super-Earth in the radius valley orbiting a nearby M dwarf. Monthly Notices of the Royal Astronomical Society, 541(4), 3249-3268. https://doi.org/10.1093/mnras/staf1030

@article{d231dc9f76f44f71841d8bf13358fc82,

title = "TOI-1846 b: A super-Earth in the radius valley orbiting a nearby M dwarf",

abstract = "We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star () is located 47 pc away and has a radius of, a mass of and an effective temperature of K. Our analyses are based on joint modelling of Transiting Exoplanet Survey Satellite (TESS) photometry and ground-based multicolour photometric data. We also use high-resolution imaging and archival images, as well as statistical validation techniques to support the planetary system nature. We find that TOI-1846 b is a super-Earth sized planet with radius of and a predicted mass of (from the Chen \& Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of (assuming a null Bond Albedo) and an incident flux of. Based on the two radial velocity (RV) measurements obtained with the Tillinghast Reflector Echelle Spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of 1.8, TOI-1846 b is within the sparsely populated radius range around 2 known as the radius gap (or radius valley). This discovery can contribute to refining the precise location of the radius valley for small planets orbiting bright M dwarfs, thereby enhancing our understanding of planetary formation and evolution processes.",

keywords = "planetary systems, planets and satellites, stars: individual: (TIC 198385543, TOI 1846)",

author = "Abderahmane Soubkiou and Khalid Barkaoui and Zouhair Benkhaldoun and Mourad Ghachoui and Jamila Chouqar and Rackham, \{Benjamin V.\} and Adam Burgasser and Emma Softich and Enric Pall{\'e} and Akihiko Fukui and Norio Narita and Felipe Murgas and Howell, \{Steve B.\} and Clark, \{Catherine A.\} and Colin Littlefield and Allyson Bieryla and Boyle, \{Andrew W.\} and David Ciardi and Karen Collins and \{I. Collins\}, Kevin and \{De Leon\}, Jerome and Dressing, \{Courtney D.\} and Jason Eastman and Emma Esparza-Borges and Steven Giacalone and Holden Gill and Micha{\"e}l Gillon and Kai Ikuta and Jenkins, \{J. M.\} and Taiki Kagetani and Latham, \{David W.\} and Mayuko Mori and Hannu Parviainen and Emily Pass and G. Ricker and Safonov, \{Boris S.\} and Savel, \{Arjun B.\} and Schwarz, \{Richard P.\} and Sara Seager and Strakhov, \{Ivan A.\} and Gregor Srdoc and R. Vanderspek and Noriharu Watanabe and Watkins, \{Cristilyn N.\} and J. Winn",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2025",

month = aug,

day = "1",

doi = "10.1093/mnras/staf1030",

language = "English (US)",

volume = "541",

pages = "3249--3268",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Soubkiou, A, Barkaoui, K, Benkhaldoun, Z, Ghachoui, M, Chouqar, J, Rackham, BV, Burgasser, A, Softich, E, Pallé, E, Fukui, A, Narita, N, Murgas, F, Howell, SB, Clark, CA, Littlefield, C, Bieryla, A, Boyle, AW, Ciardi, D, Collins, K, I. Collins, K, De Leon, J, Dressing, CD, Eastman, J, Esparza-Borges, E, Giacalone, S, Gill, H, Gillon, M, Ikuta, K, Jenkins, JM, Kagetani, T, Latham, DW, Mori, M, Parviainen, H, Pass, E, Ricker, G, Safonov, BS, Savel, AB, Schwarz, RP, Seager, S, Strakhov, IA, Srdoc, G, Vanderspek, R, Watanabe, N, Watkins, CN & Winn, J 2025, 'TOI-1846 b: A super-Earth in the radius valley orbiting a nearby M dwarf', Monthly Notices of the Royal Astronomical Society, vol. 541, no. 4, pp. 3249-3268. https://doi.org/10.1093/mnras/staf1030

TY - JOUR

T1 - TOI-1846 b

T2 - A super-Earth in the radius valley orbiting a nearby M dwarf

AU - Soubkiou, Abderahmane

AU - Barkaoui, Khalid

AU - Benkhaldoun, Zouhair

AU - Ghachoui, Mourad

AU - Chouqar, Jamila

AU - Rackham, Benjamin V.

AU - Burgasser, Adam

AU - Softich, Emma

AU - Pallé, Enric

AU - Fukui, Akihiko

AU - Narita, Norio

AU - Murgas, Felipe

AU - Howell, Steve B.

AU - Clark, Catherine A.

AU - Littlefield, Colin

AU - Bieryla, Allyson

AU - Boyle, Andrew W.

AU - Ciardi, David

AU - Collins, Karen

AU - I. Collins, Kevin

AU - De Leon, Jerome

AU - Dressing, Courtney D.

AU - Eastman, Jason

AU - Esparza-Borges, Emma

AU - Giacalone, Steven

AU - Gill, Holden

AU - Gillon, Michaël

AU - Ikuta, Kai

AU - Jenkins, J. M.

AU - Kagetani, Taiki

AU - Latham, David W.

AU - Mori, Mayuko

AU - Parviainen, Hannu

AU - Pass, Emily

AU - Ricker, G.

AU - Safonov, Boris S.

AU - Savel, Arjun B.

AU - Schwarz, Richard P.

AU - Seager, Sara

AU - Strakhov, Ivan A.

AU - Srdoc, Gregor

AU - Vanderspek, R.

AU - Watanabe, Noriharu

AU - Watkins, Cristilyn N.

AU - Winn, J.

PY - 2025/8/1

Y1 - 2025/8/1

N2 - We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star () is located 47 pc away and has a radius of, a mass of and an effective temperature of K. Our analyses are based on joint modelling of Transiting Exoplanet Survey Satellite (TESS) photometry and ground-based multicolour photometric data. We also use high-resolution imaging and archival images, as well as statistical validation techniques to support the planetary system nature. We find that TOI-1846 b is a super-Earth sized planet with radius of and a predicted mass of (from the Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of (assuming a null Bond Albedo) and an incident flux of. Based on the two radial velocity (RV) measurements obtained with the Tillinghast Reflector Echelle Spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of 1.8, TOI-1846 b is within the sparsely populated radius range around 2 known as the radius gap (or radius valley). This discovery can contribute to refining the precise location of the radius valley for small planets orbiting bright M dwarfs, thereby enhancing our understanding of planetary formation and evolution processes.

AB - We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star () is located 47 pc away and has a radius of, a mass of and an effective temperature of K. Our analyses are based on joint modelling of Transiting Exoplanet Survey Satellite (TESS) photometry and ground-based multicolour photometric data. We also use high-resolution imaging and archival images, as well as statistical validation techniques to support the planetary system nature. We find that TOI-1846 b is a super-Earth sized planet with radius of and a predicted mass of (from the Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of (assuming a null Bond Albedo) and an incident flux of. Based on the two radial velocity (RV) measurements obtained with the Tillinghast Reflector Echelle Spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of 1.8, TOI-1846 b is within the sparsely populated radius range around 2 known as the radius gap (or radius valley). This discovery can contribute to refining the precise location of the radius valley for small planets orbiting bright M dwarfs, thereby enhancing our understanding of planetary formation and evolution processes.

KW - planetary systems

KW - planets and satellites

KW - stars: individual: (TIC 198385543

KW - TOI 1846)

UR - https://www.scopus.com/pages/publications/105012387770

UR - https://www.scopus.com/pages/publications/105012387770#tab=citedBy

U2 - 10.1093/mnras/staf1030

DO - 10.1093/mnras/staf1030

M3 - Article

AN - SCOPUS:105012387770

SN - 0035-8711

VL - 541

SP - 3249

EP - 3268

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

TOI-1846 b: A super-Earth in the radius valley orbiting a nearby M dwarf

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