Year: 2025
Type: article
Abstract: We present the validation of TOI-2407 b, a warm Neptune-sized planet with a radius of 4.26 ± 0.26 R⊕, orbiting an early M-type star with a period of 2.7 days and an equilibrium temperature of 705 ± 12 K. The planet was identified by TESS photometry and validated in this work through multi-wavelength ground-based follow-up observations. We include an observation with the novel CMOS-based infrared instrument SPIRIT at the SPECULOOS Southern Observatory. The high-precision transit data enabled by CMOS detectors underscore their potential for improving the detection and characterisation of exoplanets orbiting M-dwarfs, particularly in the infrared, where these stars emit most of their radiation. TOI-2407 b lies within the boundaries of the period–radius Neptune desert, an apparent scarcity of Neptune-sized planets at short orbits. Further characterisation of TOI-2407 b, such as radial velocity measurements, will refine its position within planetary demographic trends. This system also provides a comparison case for the well-studied Neptune-sized planet Gliese 436 b, of similar radius, period and stellar type. Comparison studies could aid the understanding of the formation and evolution of Neptune-like planets around M-dwarfs.
Source: Apollo (University of Cambridge)
DOI: 10.17863/cam.119060
Authors: Janó Muñoz, C, Hooton, MJ, Pedersen, PP, Barkaoui, K, Rackham, BV, Burgasser, AJ, Pozuelos, FJ, Stassun, KG, Queloz, D, Triaud, AHMJ, Ziegler, C, Almenara, JM, Timmermans, M, Bonfils, X, Collins, KA, Demory, BO, Dransfield, G, Ghachoui, M, Gillon, M, Jehin, E, Mann, AW, Sebastian, D, Thompson, S, Twicken, JD, de Wit, J, Zúñiga-Fernández, S
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Michigan State University, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Fonds De La Recherche Scientifique - FNRS, Fédération Wallonie-Bruxelles, Ministério da Ciência, Tecnologia e Inovação, Ministry of Science, ICT and Future Planning, Nuclear Safety and Security Commission, Ames Research Center, College of Engineering, Michigan State University, University of North Carolina at Chapel Hill, Science Mission Directorate, Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture, Staatssekretariat für Bildung, Forschung und Innovation, Agencia Estatal de Investigación, FP7 Ideas: European Research Council
Awards: G101150294, G1853635042, G18599350, G3207356259, Exoplanets in Transit and their Atmosphere, G3480869486, G463062595, G5059192377, G5894067328, G6686480456, G7084143925, G7288031051, G7553243680, G7719629023, Alexander von Humboldt and the Globalization of Science: Networks of Knowledge between Germany and the United States in the 19th Century, G8684520763, G878044590, G896728979
OpenAlex ID: W6944079767
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