The K2-24 planetary system revisited by CHEOPS

Nascimbeni, V. and Borsato, L. and Leonardi, P. and Sousa, S. G. and Wilson, T. G. and Fortier, A. and Heitzmann, A. and Mantovan, G. and Luque, R. and Zingales, T. and Piotto, G. and Alibert, Y. and Alonso Sobrino, R. and Bàrczy, T. and Barrado Navascues, D. and Barros, S. C. C. and Baumjohann, W. and Beck, T. and Benz, W. and Billot, N. and Biondi, F. and Brandeker, A. and Broeg, C. and Busch, M. -D. and Collier Cameron, A. and Correia, A. C. M. and Csizmadia, Sz. and Cubillos, P. E. and Davies, M. B. and Deleuil, M. and Deline, A. and Delrez, L. and Demangeon, O. D. S. and Demory, B. -O. and Derekas, A. and Edwards, B. and Ehrenreich, D. and Erikson, A. and Fossati, L. and Fridlund, M. and Gandolfi, D. and Gazeas, K. and Gillon, M. and Güdel, M. and Günther, M. N. and Helling, Ch. and Isaak, K. G. and Kerschbaum, F. and Kiss, L. L. and Korth, J. and Lam, K. W. F. and Laskar, J. and Lecavelier des Etangs, A. and Leleu, A. and Lendl, M. and Magrin, D. and Maxted, P. F. L. and Merin, B. and Mordasini, C. and Olofsson, G. and Ottensamer, R. and Pagano, I. and Palle, E. and Peter, G. and Pollacco, D. and Queloz, D. and Ragazzoni, R. and Rando, N. and Rauer, H. and Ribas, I. and Santos, N. C. and Scandariato, G. and Ségransan, D. and Simon, A. E. and Smith, A. M. S. and Southworth, R. and Stalport, M. and Sulis, S. and Szabó, Gy. M. and Udry, S. and Ulmer, B. and Van Grootel, V. and Venturini, J. and Villaver, E. and Walton, N. A. (2024) The K2-24 planetary system revisited by CHEOPS. Astronomy and Astrophysics, 690, A349. EDP Sciences. doi: 10.1051/0004-6361/202450852. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/full_html/2024/10/aa50852-24/aa50852-24.html

Abstract

The planetary system K2-24 is composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large transit time variations (TTVs), and it is an excellent laboratory to search for signatures of planetary migration. Previous studies performed with K2, Spitzer, and RV data tentatively claimed a significant non-zero eccentricity for one or both planets, possibly high enough to challenge the scenario of pure disk migration through resonant capture. With 13 new CHEOPS light curves (seven of planet b, six of planet c), we carried out a global photometric and dynamical re-analysis by including all the available literature data as well. We obtained the most accurate set of planetary parameters to date for the K2-24 system, including radii and masses at 1% and 5% precision (now essentially limited by the uncertainty on stellar parameters) and non-zero eccentricities eb = 0.0498‑0.0018+0.0011, ec = 0.0282‑0.0007+0.0003 detected at very high significance for both planets. Such relatively large values imply the need for an additional physical mechanism of eccentricity excitation during or after the migration stage. Also, while the accuracy of the previous TTV model had drifted by up to 0.5 days at the current time, we constrained the orbital solution firmly enough to predict the forthcoming transits for the next ~15 years, thus enabling efficient follow-up with top-level facilities such as JWST or ESPRESSO.

Item URL in elib:

https://elib.dlr.de/209722/

Document Type:

Article

Title:

The K2-24 planetary system revisited by CHEOPS

Authors:

Authors	Institution or Email of Authors	Author's ORCID iD	ORCID Put Code
Nascimbeni, V.	INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy	UNSPECIFIED	UNSPECIFIED
Borsato, L.	Dipartimento di Fisica e Astronomia, Universita degli Studi di Padova, via Marzolo 8, 35131 Padova, Italy	https://orcid.org/0000-0001-8627-9628	UNSPECIFIED
Leonardi, P.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Sousa, S. G.	Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Wilson, T. G.	Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK	UNSPECIFIED	UNSPECIFIED
Fortier, A.	Physikalisches Institut, University of Bern, Bern, Switzerland	https://orcid.org/0000-0001-8450-3374	UNSPECIFIED
Heitzmann, A.	Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, 1290, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Mantovan, G.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Luque, R.	Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA	UNSPECIFIED	UNSPECIFIED
Zingales, T.	Dipartimento di Fisica e Astronomia "Galileo Galilei", Universita degli Studi di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy; INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy	UNSPECIFIED	UNSPECIFIED
Piotto, G.	INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Alibert, Y.	Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Alonso Sobrino, R.	Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain	UNSPECIFIED	UNSPECIFIED
Bàrczy, T.	Admatis, Miskolc, Hungary	UNSPECIFIED	UNSPECIFIED
Barrado Navascues, D.	Depto. de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC Campus, E-28692 Villanueva de la Cañada, Madrid, Spain	UNSPECIFIED	UNSPECIFIED
Barros, S. C. C.	Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal	https://orcid.org/0000-0003-2434-3625	UNSPECIFIED
Baumjohann, W.	Space Research Institute, Austrian Academy of Sciences, Austria	UNSPECIFIED	UNSPECIFIED
Beck, T.	Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Benz, W.	Physikalisches Institut,University of Bern, Sidlerstraße 5, CH-3012 Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Billot, N.	Observatoire de Genève, University of Geneva, Switzerland	UNSPECIFIED	UNSPECIFIED
Biondi, F.	INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Brandeker, A.	Department of Astronomy , Stockholm University, SE-106 91 Stockholm, Sweden	UNSPECIFIED	UNSPECIFIED
Broeg, C.	Physikalisches Institut, University of Bern, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Busch, M. -D.	Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Collier Cameron, A.	SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK	https://orcid.org/0000-0002-8863-7828	UNSPECIFIED
Correia, A. C. M.	CFisUC, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal	UNSPECIFIED	UNSPECIFIED
Csizmadia, Sz.	UNSPECIFIED	https://orcid.org/0000-0001-6803-9698	UNSPECIFIED
Cubillos, P. E.	INAF, Osservatorio Astrofisico di Torino, Via Osservatorio, 20, 10025, Pino Torinese, To, Italy; Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria	UNSPECIFIED	UNSPECIFIED
Davies, M. B.	Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, 22100, Lund, Sweden	UNSPECIFIED	UNSPECIFIED
Deleuil, M.	Aix-Marseille Universite, CNRS, CNES, LAM, Marseille, France	UNSPECIFIED	UNSPECIFIED
Deline, A.	Observatoire de Genève, University of Geneva, Switzerland	UNSPECIFIED	UNSPECIFIED
Delrez, L.	Institut d Astrophysique et de Geophysique, Universite de Liege, Allee du 6 Aout, 17, Bat. B5C, Liege 1, Belgium	UNSPECIFIED	UNSPECIFIED
Demangeon, O. D. S.	Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Demory, B. -O.	Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Derekas, A.	ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, Szent Imre h. u. 112, 9700 Szombathely, Hungary	UNSPECIFIED	UNSPECIFIED
Edwards, B.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Ehrenreich, D.	Observatoire de Genève, University of Geneva, Switzerland	https://orcid.org/0000-0001-9704-5405	UNSPECIFIED
Erikson, A.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Fossati, L.	Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria	https://orcid.org/0000-0003-4426-9530	UNSPECIFIED
Fridlund, M.	Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands	UNSPECIFIED	UNSPECIFIED
Gandolfi, D.	Dipartimento di Fisica, Universitadi Torino, via P. Giuria 1, I-10125 Torino, Italy	UNSPECIFIED	UNSPECIFIED
Gazeas, K.	Section of Astrophysics, Astronomy and Mechanics, Department of Physics, Athens	UNSPECIFIED	UNSPECIFIED
Gillon, M.	Astrobiology Research Unit, Université de Liège, 19C Allée du 6 Août, 4000, Liège, Belgium	UNSPECIFIED	UNSPECIFIED
Güdel, M.	University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180, Vienna, Austria	UNSPECIFIED	UNSPECIFIED
Günther, M. N.	European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201 AZ, Noordwijk, The Netherlands	UNSPECIFIED	UNSPECIFIED
Helling, Ch.	Space Research Institute, Austrian Academy of Sciences, Graz, Austria	UNSPECIFIED	UNSPECIFIED
Isaak, K. G.	Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201-AZ, Noordwijk, The Netherlands	UNSPECIFIED	UNSPECIFIED
Kerschbaum, F.	Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, 1180, Vienna, Austria	UNSPECIFIED	UNSPECIFIED
Kiss, L. L.	Konkoly Observatory, Research Centre for Astronomy and Earth, Budapest, Hungary	UNSPECIFIED	UNSPECIFIED
Korth, J.	Lund Observatory, Division of Astrophysics, Department of Physics, Lund University, Lund, Sweden	UNSPECIFIED	UNSPECIFIED
Lam, K. W. F.	UNSPECIFIED	https://orcid.org/0000-0002-9910-6088	UNSPECIFIED
Laskar, J.	IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ.,Sorbonne Univ., 77 av. Denfert-Rochereau, 75014 Paris, France	UNSPECIFIED	UNSPECIFIED
Lecavelier des Etangs, A.	Institut d Astrophysique de Paris, CNRS, UMR 7095 & Sorbonne Universites, UPMC Paris 6, 98 bis bd Arago, 75014 Paris, France	UNSPECIFIED	UNSPECIFIED
Leleu, A.	Observatoire Astronomique de l’Université de Genève, CheminPegasi 51, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Lendl, M.	Observatoire de Genève, Université de Genève, Chemin Pegasi, 51, 1290, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Magrin, D.	INAF,OsservatorioAstronomicodiPadova,Vicolodell’Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Maxted, P. F. L.	Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK	UNSPECIFIED	UNSPECIFIED
Merin, B.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Mordasini, C.	Physikalisches Institut, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Olofsson, G.	Department of Astronomy, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden	UNSPECIFIED	UNSPECIFIED
Ottensamer, R.	Dept. of Astrophysics, University of Vienna, Austria	UNSPECIFIED	UNSPECIFIED
Pagano, I.	INAF – Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy	UNSPECIFIED	UNSPECIFIED
Palle, E.	Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain \| Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Peter, G.	UNSPECIFIED	https://orcid.org/0000-0001-6101-2513	UNSPECIFIED
Pollacco, D.	Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK	UNSPECIFIED	UNSPECIFIED
Queloz, D.	ETH Zurich, Department of Physics, Wolfgang-Pauli-Strasse 2, 8093, Zurich, Switzerland; Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK	UNSPECIFIED	UNSPECIFIED
Ragazzoni, R.	Dipartimento di Fisica e Astronomia, Universita degli Studi di Padova, Vicolo dell Osservatorio 3, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Rando, N.	ESA/ESTEC, Noordwijk, Niederlande	UNSPECIFIED	UNSPECIFIED
Rauer, H.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Ribas, I.	Institut de Ciències de l’Espai (CSIC), Campus UAB, c/ de Can Magrans s/n, Barcelona, Spain; Institut d’Estudis Espacials de Catalunya, Barcelona, Spain	UNSPECIFIED	UNSPECIFIED
Santos, N. C.	Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal; Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Scandariato, G.	INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy	UNSPECIFIED	UNSPECIFIED
Ségransan, D.	Geneva Observatory, University of Geneva, Chemin Pegasi 51, CH-1290 Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Simon, A. E.	Center for Space and Habitability, University of Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Smith, A. M. S.	UNSPECIFIED	https://orcid.org/0000-0002-2386-4341	UNSPECIFIED
Southworth, R.	ESTEC, European Space Agency, Keplerlaan 1, NL-2201AZ Noordwijk, the Netherlands	UNSPECIFIED	UNSPECIFIED
Stalport, M.	Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Sulis, S.	Aix Marseille Univ., CNRS, CNES, LAM, 38 Rue Frédéric Joliot-Curie, 13388, Marseille, France	UNSPECIFIED	UNSPECIFIED
Szabó, Gy. M.	ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, 9700, Szombathely, Szent Imre h. u. 112, Hungary ; MTA-ELTE Exoplanet Research Group, 9700, Szombathely, Szent Imre h. u. 112, Hungary	UNSPECIFIED	UNSPECIFIED
Udry, S.	Observatoire de Genève, Université de Genève, Chemin Pegasi, 51, 1290, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Ulmer, B.	Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany	UNSPECIFIED	UNSPECIFIED
Van Grootel, V.	Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 19C, 4000 Liège, Belgium	UNSPECIFIED	UNSPECIFIED
Venturini, J.	Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, 1290, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Villaver, E.	Instituto de Astrofisica de Canarias, Via Lactea s/n, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, Astrofísico Francisco Sanchez s/n, 38206, La Laguna, Tenerife, Spain	UNSPECIFIED	UNSPECIFIED
Walton, N. A.	Institute of Astronomy, University of Cambridge, Cambridge, UK	UNSPECIFIED	UNSPECIFIED

Date:

2024

Journal or Publication Title:

Astronomy and Astrophysics

Refereed publication:

Yes

Open Access:

Yes

Gold Open Access:

In SCOPUS:

Yes

In ISI Web of Science:

Yes

Volume:

690

DOI:

10.1051/0004-6361/202450852

Page Range:

A349

Publisher:

EDP Sciences

ISSN:

0004-6361

Status:

Published

Keywords:

techniques: photometric, techniques: spectroscopic, planets and satellites: detection, planets and satellites: dynamical evolution and stability, planets and satellites: gaseous planets, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics

HGF - Research field:

Aeronautics, Space and Transport

HGF - Program:

Space

HGF - Program Themes:

Space Exploration

DLR - Research area:

Raumfahrt

DLR - Program:

R EW - Space Exploration

DLR - Research theme (Project):

R - CHEOPS Science, R - Project CHEOPS

Location:

Berlin-Adlershof

Institutes and Institutions:

Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Institute of Optical Sensor Systems > Space Instruments

Deposited By:

Smith, Dr Alexis M S

Deposited On:

03 Dec 2024 07:49

Last Modified:

03 Dec 2024 07:49

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