A joint effort to discover and characterize two resonant mini-Neptunes around TOI-1803 with TESS, HARPS-N, and CHEOPS
Artikel i vetenskaplig tidskrift, 2025
Context. The discovery and characterization of mini-Neptunes hold a potentially crucial impact on planetary formation and evolution theories. Estimating their orbital parameters and atmospheric properties would provide valuable hints to improve formation and atmospheric models. Aims. We present the discovery of two mini-Neptunes near a 2:1 orbital resonance configuration orbiting the K0 star TOI-1803. We describe in detail their orbital architecture and suggest some possible formation and evolution scenarios. Methods. Using CHEOPS, TESS, and HARPS-N datasets, we estimated the radius and the mass of both planets. We used a multidimensional Gaussian process with a quasi-periodic kernel to disentangle the planetary components from the stellar activity in the HARPS-N dataset. We performed dynamical modeling to explain the orbital configuration and performed planetary formation and evolution simulations. For the least dense planet, we assumed different atmospheric compositions and defined possible atmospheric scenarios with simulated JWST observations. Results. TOI-1803 b and TOI-1803 c have orbital periods of ∼6.3 and ∼12.9 days, respectively, residing in close proximity to a 2:1 orbital resonance. Ground-based photometric follow-up observations have revealed significant transit timing variations (TTV) with an amplitude of ∼10 min and ∼40 min, respectively, for planets b and -c. With the masses computed from the radial velocities dataset, we obtained a density of (0.39 ± 0.10) ρ⊕ and (0.076 ± 0.038) ρ⊕ for planets b and -c, respectively. TOI-1803 c is among the least dense mini-Neptunes currently known, and due to its inflated atmosphere, it is a suitable target for transmission spectroscopy with JWST. With NIRSpec observations, we could understand whether the planet has kept its primary atmosphere or not, which would constrain our formation models. Conclusions. We report the discovery of two mini-Neptunes close to a 2:1 orbital resonance. The detection of significant TTVs from ground-based photometry opens scenarios for a more precise mass determination. TOI-1803 c is one of the least dense mini-Neptunes known so far, and it is of great interest among the scientific community since it could constrain current formation scenarios. JWST observations could give us valuable insights to characterize this interesting system.
Planets and satellites: interiors
Planets and satellites: detection
Planets and satellites: fundamental parameters
Planets and satellites: formation
Planets and satellites: dynamical evolution and stability
Författare
Tiziano Zingales
Università di Padova
Luca Malavolta
Università di Padova
Luca Borsato
Istituto nazionale di astrofisica (INAF)
Diego Turrini
Istituto nazionale di astrofisica (INAF)
Andrea Bonfanti
Institut fur Weltraumforschung
Danae Polychroni
Osservatorio Astronomico di Trieste
Giacomo Mantovan
Università di Padova
Domenico Nardiello
Università di Padova
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
Antonino Francesco Lanza
Istituto nazionale di astrofisica (INAF)
Anja Bekkelien
Université de Genève
Alessandro Sozzetti
Istituto nazionale di astrofisica (INAF)
Christopher Broeg
Universität Bern
Luca Naponiello
Istituto nazionale di astrofisica (INAF)
Monika Lendl
Université de Genève
Aldo Stefano Bonomo
Istituto nazionale di astrofisica (INAF)
Attila E. Simon
Universität Bern
Silvano Desidera
Istituto nazionale di astrofisica (INAF)
Giampaolo Piotto
Università di Padova
Luigi Mancini
Universita degli Studi di Roma Tor Vergata
Matthew J. Hooton
University of Cambridge
Andrea Bignamini
Osservatorio Astronomico di Trieste
Jo Ann Egger
Universität Bern
Antonio Maggio
Istituto nazionale di astrofisica (INAF)
Yann Alibert
Universität Bern
Daniele Locci
Istituto nazionale di astrofisica (INAF)
Laetitia Delrez
Universite de Liège
Federico Biassoni
Universita degli Studi dell'Insubria
Luca Fossati
Institut fur Weltraumforschung
Lorenzo Cabona
Istituto nazionale di astrofisica (INAF)
Gaia Lacedelli
Instituto de Astrofísica de Canarias
Ilaria Carleo
Instituto de Astrofísica de Canarias
Pietro Leonardi
Università di Padova
Gloria Andreuzzi
Osservatorio Astronomico di Roma
Alexis Brandeker
Stockholms universitet
Rosario Cosentino
Istituto nazionale di astrofisica (INAF)
Alexandre C. M. Correia
Universidade de Coimbra
Riccardo Claudi
Istituto nazionale di astrofisica (INAF)
Roi Alonso
Instituto de Astrofísica de Canarias
Mario Damasso
Istituto nazionale di astrofisica (INAF)
Thomas G. Wilson
The University of Warwick
Tamás Bárczy
Admatis
Matteo Pinamonti
Istituto nazionale di astrofisica (INAF)
David Baker
Austin College
Khalid Barkaoui
Universite de Liège
David Barrado Navascués
Europeiska rymdorganisationen (ESA)
Susana Barros
Universidade do Porto
Wolfgang Baumjohann
Institut fur Weltraumforschung
Thomas Beck
Universität Bern
Charles A. Beichman
National Aeronautics and Space Administration (NASA)
Willy Benz
Universität Bern
Allyson Bieryla
Harvard-Smithsonian Center for Astrophysics
Nicolas Billot
Université de Genève
Pau Bosch-Cabot
Observatori Astronòmic Albanya
Luke Bouma
California Institute of Technology (Caltech)
David Ciardi
National Aeronautics and Space Administration (NASA)
Andrew Cameron
University of St Andrews
Karen Collins
Harvard-Smithsonian Center for Astrophysics
Ian J. M. Crossfield
University of Kansas
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Patricio Cubillos
Institut fur Weltraumforschung
Melvyn Davies
Lunds universitet
Magali Deleuil
Laboratoire d'Astrophysique de Marseille
Adrien Deline
Université de Genève
Olivier Demangeon
Universidade do Porto
Brice-Olivier Demory
Universität Bern
Aliz Derekas
Eötvös Loránd University (ELTE)
Diana Dragomir
University of New Mexico
Billy Edwards
Netherlands Institute for Space Research (SRON)
David Ehrenreich
Université de Genève
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Ben Falk
Space Telescope Science Institute (STScI)
Andrea Fortier
Universität Bern
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Universiteit Leiden
Akihiko Fukui
Instituto de Astrofísica de Canarias
Davide Gandolfi
Universita degli Studi di Torino
Kosmas Gazeas
University of Athens
Michaël Gillon
Universite de Liège
Erica J. Gonzales
University of California
Manuel Guedel
Universität Wien
Pere Guerra
Observatori Astronòmic Albanya
Maximilian N. Günther
Europeiska rymdorganisationen (ESA)
Alexis Heitzmann
Université de Genève
Ch. Helling
Institut fur Weltraumforschung
Steve B. Howell
National Aeronautics and Space Administration (NASA)
Kate Isaak
Europeiska rymdorganisationen (ESA)
Jon Jenkins
National Aeronautics and Space Administration (NASA)
Laszlo Kiss
Magyar Tudomanyos Akademia
Judith Korth
Lunds universitet
Kristine Wai Fun Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Jacques Laskar
Observatoire de Paris
Alain Lecavelier des Etangs
Institut d 'Astrophysique de Paris
Demetrio Magrin
Istituto nazionale di astrofisica (INAF)
Rachel Matson
National Aeronautics and Space Administration (NASA)
Elisabeth Matthews
Max-Planck-Gesellschaft
Pierre Maxted
Keele University
Scott McDermott
Protologic LLC
Matteo Munari
Istituto nazionale di astrofisica (INAF)
Christoph Mordasini
Universität Bern
Norio Narita
Instituto de Astrofísica de Canarias
Göran Olofsson
Stockholms universitet
Roland Ottensamer
Universität Wien
Isabella Pagano
Istituto nazionale di astrofisica (INAF)
Enric Palle
Instituto de Astrofísica de Canarias
Gisbert Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Donald L. Pollacco
The University of Warwick
Didier Queloz
University of Cambridge
Roberto Ragazzoni
Università di Padova
Nicola Rando
Europeiska rymdorganisationen (ESA)
Francesco Ratti
Europeiska rymdorganisationen (ESA)
Heike Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Ignasi Ribas
Consejo Superior de Investigaciones Científicas (CSIC)
Sébastien Salmon
Université de Genève
Nuno Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
Sara Seager
Massachusetts Institute of Technology (MIT)
Damien Ségransan
Université de Genève
Alexis M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Joshua E. Schlieder
National Aeronautics and Space Administration (NASA)
Richard Schwarz
Harvard-Smithsonian Center for Astrophysics
Avi Shporer
Massachusetts Institute of Technology (MIT)
S. G. Sousa
Universidade do Porto
Manu Stalport
Universite de Liège
M. Steinberger
Institut fur Weltraumforschung
Sophia Sulis
Laboratoire d'Astrophysique de Marseille
Gyula Szabó
Eötvös Loránd University (ELTE)
Joseph Twicken
National Aeronautics and Space Administration (NASA)
Stephane Udry
Université de Genève
Valerie Van Grootel
Universite de Liège
Julia Venturini
Université de Genève
Eva Villaver
Instituto de Astrofísica de Canarias
Nicholas Walton
University of Cambridge
Joshua N. Winn
Princeton University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 695 A273Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202451180