2026
article
NIRPS tightens the mass estimate of GJ 3090 b and detects a planet near the stellar rotation period
Pierrot Lamontagne, Drew Weisserman, Charles Cadieux, David Lafrenière, Alexandrine L’Heureux, Mykhaylo Plotnykov, Léna Parc, K. Atanas Stefanov, Leslie Moranta, René Doyon, François Bouchy, J.-B. Delisle, D. Louise Nielsen, Gaspare Lo Curto, Frédérique Baron, C. Susana Barros, Björn Benneke, Xavier Bonfils, Marta Bryan, L. Bruno Canto Martins, Ryan Nelson Cloutier, B. Nicolas Cowan, Daniel Brito de Freitas, Jose Renan De Medeiros, Xavier Delfosse, Elisa Delgado-Mena, Xavier Dumusque, David Ehrenreich, Pedro Figueira, I. Jonay González Hernández, I. C. Leão, Christophe Lovis, Lison Malo, Claudio Melo, L. Mignon, Christoph Mordasini, Francesco Pepe, Rafael Rebolo, Jason Rowe, C. Nuno Santos, Damien Ségransan, Alejandro Suárez Mascareño, Stéphane Udry, Diana Valencia, Gregg Wade, Manuel Abreu, José Luan A. Aguiar, Khaled Al Moulla, Guillaume Allain, Romain Allart, J. M. Almenara, Tomy Arial, Hugues Auger, Luc Bazinet, Nicolas Blind, David Bohlender, 'Etienne Artigau, Isabelle Boisse, Anne Boucher, Vincent Bourrier, Sébastien Bovay, Pedro Branco, C. Broeg, Denis Brousseau, Alexandre Cabral, Andres Carmona, Yann Carteret, Zalpha Challita, David Charbonneau, Bruno Chazelas, A. Catherine Clark, João Coelho, Marion Cointepas, A. Karen Collins, I. Kevin Collins, Uriel Conod, Eduardo Cristo, Ana Catarina do Rosário Silva, Antoine Darveau-Bernier, Laurie Dauplaise, Roseane de Lima Gomes, João Faria, O. Dasaev Fontinele, Thierry Forveille, G.C. Yolanda Frensch, Jonathan Gagné, Frédéric Genest, Ludovic Genolet, João Pedro Bittencourt da Silva, Félix Gracia Témich, Nicole Gromek, Nolan Grieves, Olivier Hernandez, J. Melissa Hobson, H. Jens Hoeijmakers, Norbert Hubin, J. Neil Cook, Marziye Jafariyazani, Farbod Jahandar, Ray Jayawardhana, Hans-Ulrich Käufl, Dan Kerley, Johann Kolb, Vigneshwaran Krishnamurthy, Benjamin Küng, Pierre Larue, Henry Leath, Olivia Lim, M. Allan Martins, C. Elisabeth Matthews, Jaymie Matthews, Jean-Sébastien Mayer, Stan Metchev, Lina Messamah, S. Yuri Messias, Dany Mounzer, N. Nari, Ares Osborn, Mathieu Ouellet, Jon Otegi, Luca Pasquini, M. Vera Passegger, Stefan Pelletier, Céline Péroux, Caroline Piaulet, E. Pompei, Anne-Sophie Poulin-Girard, José Luis Rasilla, В. А. Решетов, Jonathan Saint-Antoine, Mirsad Sarajlic, I. Saviane, Robin Schnell, Alex Segovia, J. V. Seidel, A. Silber, Peter Sinclair, Michael Sordet, Danuta Sosnowska, Avidaan Srivastava, A. Márcio Teixeira, Simon Thibault, Philippe Vallée, Thomas Vandal, Valentina Vaulato, P. Joost Wardenier, Bachar Wehbé, Ivan Wevers, François Wildi, Vincent Yariv, Gérard Zins
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Le résumé fourni par la source
We present an updated characterization of the planetary system orbiting the nearby M2 dwarf GJ 3090 (TOI-177; d=22 pc), based on new high-precision radial velocity (RV) observations from NIRPS and HARPS. With an orbital period of 2.85 d, the transiting sub-Neptune GJ 3090 b has a mass we refine to 4.52 ± 0.47 M⊕, which, combined with our derived radius of 2.18 ± 0.06 R⊕, yields a density of 2.40−0.30+0.33 g∉cm−3. The combined interior structure and atmospheric constraints indicate that GJ 3090 b is a compelling water-world candidate, with a volatile-rich envelope in which water likely represents a significant fraction. We also confirm the presence of a second planet, GJ 3090 c, a sub-Neptune with a 15.9 d orbit and a minimum mass of 10.0 ± 1.3 M⊕, which does not transit. Despite its proximity to the star’s 18 d rotation period, our joint analysis using a multidimensional Gaussian process (GP) model that incorporates TESS photometry and differential stellar temperature measurements distinguishes this planetary signal from activity-induced variability. In addition, we place new constraints on a non-transiting planet candidate with a period of 12.7 d, suggested in earlier RV analyses. This candidate remains a compelling target for future monitoring. These results highlight the crucial role of multidimensional GP modelling in disentangling planetary signals from stellar activity, enabling the detection of a planet near the stellar rotation period that could have remained undetected with traditional approaches.
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Les sujets associés
Stellar, planetary, and galactic studiesAstro and Planetary ScienceAstronomy and Astrophysical Research