Precise mass and radius determination for two new and one known Neptune-sized planets around G dwarf hosts
Year: 2025
Type: article
Abstract: ABSTRACT As part of the KESPRINT collaboration, we present the discovery and characterization of three exoplanets in the sub-Neptune to super-Neptune regime, spanning key regions of the exo-Neptunian landscape. TOI-1472 c and TOI-1648 b are newly discovered sub-Neptunes, while TOI-1472 b is a previously known super-Neptune for which we provide an improved mass measurement. These planets have orbital periods of 6–15 d and radii of 2.5–4.1 R$_{\oplus }$, probing regions where planet formation and atmospheric evolution remain poorly understood. We combine Transiting Exoplanet Survey Satellite transit photometry with ground-based radial velocities to determine precise masses, radii, and orbital properties. TOI-1472 b has a mass of $18.0^{+0.84}_{-0.85}$ M$_{\oplus }$ and a radius of $4.06 \pm 0.10$ R$_{\oplus }$, TOI-1472 c has a mass of $21.1^{+0.96}_{-0.99}$ M$_{\oplus }$ and a radius of $3.33 \pm 0.08$ R$_{\oplus }$, and TOI-1648 b has a mass of $7.4^{+1.1}_{-1.3}$ M$_{\oplus }$ and a radius of $2.54^{+0.14}_{-0.12}$ R$_{\oplus }$. The planets exhibit a range of eccentricities (0.041–0.178), indicating diverse evolutionary histories. TOI-1648 b, with a high transmission spectroscopy metric (${\rm TSM} \sim 59$), is a promising target for atmospheric characterization. Together, these three planets provide precise constraints on the structure, composition, and dynamical evolution of small to intermediate-sized exoplanets, enriching our understanding of the exo-Neptunian landscape.
Authors: Ilaria Carleo, Grzegorz Nowak, Felipe Murgas, Enric Pallé, Gaia Lacedelli, Thomas Masseron, Emily W Wong, Amadeo Castro-González, Dawid Jankowski, Patrick Eggenberger, James S Jenkins, Krzysztof Goździewski, Vincent Bourrier, Douglas R Alves, José I Vines, Keivan G Stassun, Matteo Brogi, Sergio Messina, Catherine A Clark, Karen A Collins, Hans J Deeg, Elise Furlan, Davide Gandolfi, Samuel Geraldía González, Coel Hellier, Artie P Hatzes, Steve B Howell, Judith Korth, Emil Knudstrup, Jorge Lillo-Box, John H Livingston, Jaume Orell-Miquel, Carina Persson, Seth Redfield, Boris Safonov, David Baker, William Cochran, Rafael Delfin Barrena Delgado, Allyson Bieryla, Andrew Boyle, Pau Bosch-Cabot, Núria Casasayas Barris, Stavros Chairetas, David R Ciardi, Akihiko Fukui, Pere Guerra, Kiyoe Kawauchi, Florence Libotte, Michael B Lund, Rafael Luque, Eduardo Lorenzo Martín Guerrero de Escalante, Bob Massey, Edward J Michaels, Giuseppe Morello, Norio Narita, Hannu Parvianien, Richard P Schwarz, Avi Shporer, Monika Stangret, Cristilyn N Watkins
Institutions: Osservatorio Astrofisico di Torino, Instituto de Astrofísica de Canarias, National Institute for Astrophysics, Nicolaus Copernicus University, Universidad de La Laguna, University of Geneva, Centro de Astrofísica y Tecnologías Afines, Universidad Diego Portales, University of Chile, Universidad Católica del Norte, Vanderbilt University, University of Turin, Osservatorio Astrofisico di Catania, California Institute of Technology, NASA Exoplanet Science Institute, Center for Astrophysics Harvard & Smithsonian, Keele University, Thüringer Landessternwarte Tautenburg, Ames Research Center, Aarhus University, Chalmers University of Technology, European Space Astronomy Centre, Centro de Astrobiología, The Graduate University for Advanced Studies, SOKENDAI, Astrobiology Center, National Astronomical Observatory of Japan, The University of Texas at Austin, Wesleyan University, Lomonosov Moscow State University, Austin College, University of North Carolina at Chapel Hill, Komaba Institute for Science, The University of Tokyo, The University of Tokyo, Ritsumeikan University, Royal Belgian Institute for Space Aeronomy, Instituto de Astrofísica de Andalucía, Osservatorio Astronomico di Palermo, Massachusetts Institute of Technology
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, W. M. Keck Foundation, Gordon and Betty Moore Foundation, Space Telescope Science Institute, Ministerio de Ciencia, Innovación y Universidades, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Swedish National Space Agency, Ministry of Science, ICT and Future Planning, Korea Astronomy and Space Science Institute, Ministerstwo Edukacji i Nauki, Ministerio de Ciencia e Innovación, Istituto Nazionale di Astrofisica, Agencia Nacional de Investigación y Desarrollo, Ames Research Center, Horizon 2020 Framework Programme, Science Mission Directorate, Japan Society for the Promotion of Science, European Regional Development Fund, Agencia Estatal de Investigación, European Social Fund, Precursory Research for Embryonic Science and Technology, H2020 European Research Council, NextGenerationEU, NCCR Catalysis
Awards: G1105844351, G1129048233, G121809054, G1272900390, G1346768975, G1381791653, G1426358987, G1594096898, G178492357, G1799927510, G1855990336, G195395952, NCCR PlanetS: Origin, evolution and characterisation of planets, G2153432075, G2171960263, G2309174360, G2660406951, G2665511102, G2747305309, G279363373, G318412399, G3321823747, G3518538256, G3690828678, G3696727022, G373897614, G3909124325, G4008337681, Phasenübergänge und Instabilitäten, G430777504, G433322167, G4408153509, G4484233699, G4502305455, G463062595, G4642512796, G4900604909, G491712853, G4993905653, G5059192377, G5156943465, G5175525644, G5195188938, G5404395142, G5421974903, G5555131222, G5635532810, G5696905997, G58316358, CARES-RIVERS: Characterising the Architecture of (nearly-)Resonant Exoplanetary Systems - Recognition of Interval Variations in Exoplanet Recovery Surveys., G5881647929, G5894067328, G624877701, G6273510985, G6379254292, G6394348679, ON THE ORIGIN OF WARM-GIANT PLANETS, G6520718613, Asteroseismology of transport processes for the evolution of stars and planets, G6827456243, NCCR PlanetS: Origin, evolution and characterisation of planets, G7075130942, G7123013300, G7169023097, G7307374365, G745419941, G751615522, 古代説話における諸寺縁起の研究, G7805626310, G7822658684, G7863371703, G7882052119, G8298805090, G8308124115, G8497050386, G8505061131, G8577494523, G8608281586, G8712795144, G8783516428, G897484643, G99296377
OpenAlex ID: W4416099103