A gem system with a lava world and a habitable zone sub-Neptune orbiting TOI–1752
Year: 2026
Type: article
Abstract: ABSTRACT The Transiting Exoplanet Survey Satellite (TESS) has delivered a large number of transiting planet candidates around nearby stars by identifying periodic decreases in stellar brightness. Establishing the planetary nature of these signals and determining their fundamental properties is a necessary step towards detailed studies of their internal structure, atmospheres, and formation pathways. In this work, we investigate the planetary nature of the TOI–1752 system (M1 V, $103.02\pm 0.34$ pc), which hosts two TESS candidates: TOI–1752 b, a short-period object consistent with a lava-world scenario, and TOI–1752 c, a sub-Neptune-size planet candidate located in the optimistic habitable zone. We obtained ground-based multicolour photometric follow-up observations of TOI–1752, which we combined with TESS photometry to assess the nature of both signals. We performed a formal statistical validation using the TRICERATOPS framework, while independently vetting the candidates with the neural-network-based classifier WATSON-Net, which provides a machine-learning assessment of their planetary likelihood based on light-curve morphology, centroid diagnostics, and auxiliary vetting features. We validate TOI–1752 b as a bona fide planet with a radius of $1.69\pm 0.07\, R_{\oplus }$ and an orbital period of $0.935186^{+0.000001}_{-0.000002}$ d, and TOI–1752 c with a radius of $2.29^{+0.13}_{-0.14}\, R_{\oplus }$ and an orbital period of $32.7144\pm 0.0004$ d. The combined analysis confirms TOI–1752 as a new planetary system, places TOI–1752 c within the optimistic habitable zone of its host star, and identifies TOI–1752 b as a promising target for atmospheric characterization, with an estimated emission spectroscopy metric of up to $\sim 8$.
Authors: A Peláez-Torres, F J Pozuelos, G Morello, M Dévora-Pajares, K Barkaoui, L Gkouvelis, E Pallé, K A Collins, B V Rackham, S Geraldía-González, M Centenera-Merino, R Varas, E Esparza-Borges, Z Parlapani, J Flores, J Aceituno, P J Amado, A Burdanov, Y Calatayud-Borras, D R Ciardi, B O Demory, T Gan, S Giacalone, M Gillon, Y Gómez Maqueo Chew, K Kawauchi, A Khandelwal, J Korth, M Lendl, J P de Leon, J Livingston, N Morales, F Murgas, N Narita, J L Ortiz, H Parviainen, M Pichardo Marcano, I Plauchu-Frayn, D Queloz, D Rapetti, J Saito, A Sánchez-López, A B Savel, R P Schwarz, U Schroffenegger, M Serra-Ricart, C Stockdale, A H M J Triaud, J de Wit, F Zong Lang
Institutions: Instituto de Astrofísica de Andalucía, Osservatorio Astronomico di Palermo, National Institute for Astrophysics, Universidad de Granada, University of Liège, Instituto de Astrofísica de Canarias, Massachusetts Institute of Technology, Universidad de La Laguna, Center for Astrophysics Harvard & Smithsonian, Space Research Organisation Netherlands, Technical University of Denmark, Calar Alto Observatory, Universitat de València, California Institute of Technology, NASA Exoplanet Science Institute, University of Bern, Center for Space and Habitability, Westlake University, Universidad Nacional Autónoma de México, Ritsumeikan University, University of Geneva, Lund University, The University of Tokyo, The Graduate University for Advanced Studies, SOKENDAI, Astrobiology Center, National Astronomical Observatory of Japan, University of Cambridge, Ames Research Center, Universities Space Research Association, Research Institute for Advanced Computer Science, University of Maryland, College Park, University of Birmingham
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,046
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Aarhus Universitet, University of Bern, Ministerio de Ciencia, Innovación y Universidades, Japan Society for the Promotion of Science London, European Commission, Japan Science and Technology Corporation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Fonds De La Recherche Scientifique - FNRS, Ministerio de Ciencia e Innovación, Universitetet i Oslo, Háskóli Íslands, Turun Yliopisto, Universidad Nacional Autónoma de México, Stockholms Universitet, Instituto de Astrofísica de Andalucía, Instituto de Astrofísica de Canarias, Ames Research Center, Science Mission Directorate, Japan Society for the Promotion of Science, Staatssekretariat für Bildung, Forschung und Innovation, European Regional Development Fund, Agencia Estatal de Investigación, Precursory Research for Embryonic Science and Technology, H2020 European Research Council, Corporation for Supportive Housing
Awards: G1129048233, G1171257612, G121809054, G1381791653, G1416918196, G1419539455, TTV法によるM型星まわりの小型惑星の組成分布とその起源の解明, G1610079134, G1622782223, G1814045685, G1855990336, G2117251995, G2153432075, G2191281307, G2262748287, G2309174360, G2342240252, G2660406951, Exoplanets orbiting brown dwarfs, G3480869486, G3518538256, G3655586262, G3681454997, G3696727022, G3817602061, G3914968699, G4042783231, G425668148, G4408153509, G4442677895, G4502305455, G451917667, G4526231891, G463062595, ヘリウムを用いた小型惑星大気構造の観測的検証, G5080475149, G5421974903, G5649315939, CARES-RIVERS: Characterising the Architecture of (nearly-)Resonant Exoplanetary Systems - Recognition of Interval Variations in Exoplanet Recovery Surveys., G5881647929, G5894067328, G5967599077, G6361702269, G6686480456, G6771308548, G6827456243, G6877667232, G7084143925, G7110498471, G7276812026, G7434936867, 若い多惑星系による惑星進化理論の制約, G748919333, G753082317, 古代説話における諸寺縁起の研究, G7719629023, G8304717208, A Study for Unveiling Planetary Evolution with Young Transiting Exoplanets, G8549473033, G8688487427, G8792024790, G8920660035, G8931200070, G8951587258, G8971985624, G897484643
OpenAlex ID: W7154483618