TOI-1846b: A super-Earth in the radius valley orbiting a nearby M dwarf
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| Format: | Preprint |
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2025
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| author | Soubkiou, Abderahmane Barkaoui, Khalid Benkhaldoun, Zouhair Ghachoui, Mourad Chouqar, Jamila Rackham, Benjamin V. Burgasser, Adam Softich, Emma Pallé, Enric Fukui, Akihiko Narita, Norio Murgas, Felipe Howell, Steve B. Clark, Catherine A. Littlefield, Colin Bieryla, Allyson Boyle, Andrew W. Ciardi, David Collins, Karen Collins, Kevin I. de Leon, Jerome Dressing, Courtney D. Eastman, Jason Esparza-Borges, Emma Giacalone, Steven Gill, Holden Gillon, Michaël Ikuta, Kai Jenkins, J. M. Kagetani, Taiki Latham, David W. Mori, Mayuko Parviainen, Hannu Pass, Emily Ricker, G. Safonov, Boris S. Savel, Arjun B. Schwarz, Richard P. Seager, Sara Strakhov, Ivan A. Srdoc, Gregor Vanderspek, R. Watanabe, Noriharu Watkins, Cristilyn N. Winn, J. |
| author_facet | Soubkiou, Abderahmane Barkaoui, Khalid Benkhaldoun, Zouhair Ghachoui, Mourad Chouqar, Jamila Rackham, Benjamin V. Burgasser, Adam Softich, Emma Pallé, Enric Fukui, Akihiko Narita, Norio Murgas, Felipe Howell, Steve B. Clark, Catherine A. Littlefield, Colin Bieryla, Allyson Boyle, Andrew W. Ciardi, David Collins, Karen Collins, Kevin I. de Leon, Jerome Dressing, Courtney D. Eastman, Jason Esparza-Borges, Emma Giacalone, Steven Gill, Holden Gillon, Michaël Ikuta, Kai Jenkins, J. M. Kagetani, Taiki Latham, David W. Mori, Mayuko Parviainen, Hannu Pass, Emily Ricker, G. Safonov, Boris S. Savel, Arjun B. Schwarz, Richard P. Seager, Sara Strakhov, Ivan A. Srdoc, Gregor Vanderspek, R. Watanabe, Noriharu Watkins, Cristilyn N. Winn, J. |
| contents | We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star(Kmag = 9.6)is located 47 pc away and has a radius of Rs=0.41+/-0.01R_Sun,a mass of Ms=0.40+/-0.02M_Sun and an effective temperature of Teff=3568+/-44K. Our analyses are based on joint modelling of TESS photometry and ground-based multi-color 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-1846b is a super-Earth sized planet with radius of Rp=1.79+/-0.07R_Earth and a predicted mass of Mp=4.4+1.6-1.0M_Earth (from the Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of Teq=589+/-20K (assuming a null Bond Albedo) and an incident flux of Sp=17.6+/-2.0S_Earth. Based on the two RV measurements obtained with the TRES spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of ~1.8R_Earth, TOI-1846b is within the sparsely populated radius range around 2R_Earth 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18550 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | TOI-1846b: A super-Earth in the radius valley orbiting a nearby M dwarf Soubkiou, Abderahmane Barkaoui, Khalid Benkhaldoun, Zouhair Ghachoui, Mourad Chouqar, Jamila Rackham, Benjamin V. Burgasser, Adam Softich, Emma Pallé, Enric Fukui, Akihiko Narita, Norio Murgas, Felipe Howell, Steve B. Clark, Catherine A. Littlefield, Colin Bieryla, Allyson Boyle, Andrew W. Ciardi, David Collins, Karen Collins, Kevin I. de Leon, Jerome Dressing, Courtney D. Eastman, Jason Esparza-Borges, Emma Giacalone, Steven Gill, Holden Gillon, Michaël Ikuta, Kai Jenkins, J. M. Kagetani, Taiki Latham, David W. Mori, Mayuko Parviainen, Hannu Pass, Emily Ricker, G. Safonov, Boris S. Savel, Arjun B. Schwarz, Richard P. Seager, Sara Strakhov, Ivan A. Srdoc, Gregor Vanderspek, R. Watanabe, Noriharu Watkins, Cristilyn N. Winn, J. Earth and Planetary Astrophysics We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star(Kmag = 9.6)is located 47 pc away and has a radius of Rs=0.41+/-0.01R_Sun,a mass of Ms=0.40+/-0.02M_Sun and an effective temperature of Teff=3568+/-44K. Our analyses are based on joint modelling of TESS photometry and ground-based multi-color 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-1846b is a super-Earth sized planet with radius of Rp=1.79+/-0.07R_Earth and a predicted mass of Mp=4.4+1.6-1.0M_Earth (from the Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of Teq=589+/-20K (assuming a null Bond Albedo) and an incident flux of Sp=17.6+/-2.0S_Earth. Based on the two RV measurements obtained with the TRES spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of ~1.8R_Earth, TOI-1846b is within the sparsely populated radius range around 2R_Earth 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. |
| title | TOI-1846b: A super-Earth in the radius valley orbiting a nearby M dwarf |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2506.18550 |