Architecture of TOI-561 planetary system

Autor(en): G. Piotto, T. Zingales, L. Borsato, J. A. Egger, A. C.M. Correia, A. E. Simon, H. G. Florén, S. G. Sousa, P. F.L. Maxted, D. Nardiello, L. Malavolta, T. G. Wilson, Y. Alibert, V. Adibekyan, A. Bonfanti, R. Luque, N. C. Santos, M. J. Hooton, L. Fossati, A. M.S. Smith, S. Salmon, G. Lacedelli, R. Alonso, T. Bárczy, D. Barrado Navascues, S. C.C. Barros, W. Baumjohann, T. Beck, W. Benz, N. Billot, A. Brandeker, C. Broeg, M. Buder, A. Collier Cameron, Sz Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, A. Deline, O. D.S. Demangeon, B. O. Demory, A. Derekas, B. Edwards, D. Ehrenreich, A. Erikson, A. Fortier, M. Fridlund, D. Gandolfi, K. Gazeas, M. Gillon, M. Güdel, M. N. Günther, A. Heitzmann, Ch Helling, K. G. Isaak, L. L. Kiss, J. Korth, K. W.F. Lam, J. Laskar, A. Lecavelier Des Etangs, M. Lendl, P. Leonardi, D. Magrin, G. Mantovan, C. Mordasini, V. Nascimbeni, G. Olofsson, I. Pagano, E. Pallé, G. Peter, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, I. Ribas, G. Scandariato, D. Ségransan, D. Sicilia, M. Stalport, S. Sulis, Gy M. Szabó, S. Udry, S. Ulmer-Moll, V. Van Grootel, J. Venturini, E. Villaver, N. A. Walton, J. N. Winn, S. Wolf
Abstrakt: We present new observations from CHEOPS (CHaracterising ExOPlanet Satellite) and TESS (Transiting Exoplanet Survey Satellite) to clarify the architecture of the planetary system hosted by the old Galactic thick disc star TOI-561. Our global analysis, which also includes previously published photometric and radial velocity data, incontrovertibly proves that TOI-561 is hosting at least four transiting planets with periods of 0.44 d (TOI-561 b), 10.8 d (TOI-561 c), 25.7 d (TOI-561 d), and 77.1 d (TOI-561 e) and a fifth non-transiting candidate, TOI-561f with a period of 433 d. The precise characterization of TOI-561's orbital architecture is interesting since old and metal-poor thick disc stars are less likely to host ultrashort-period super-Earths like TOI-561 b. The new period of planet -e is consistent with the value obtained using radial velocity alone and is now known to be 77.14399 ± 0.00025 d, thanks to the new CHEOPS and TESS transits. The new data allowed us to improve its radius (R_p = 2.517 ± 0.045 R_⊕ from 5 per cent to 2 per cent precision) and mass(M_p = 12.4 ± 1.4 M_?) estimates, implying a density of ρ_p = 0.778 ± 0.097 ρ_⊕. Thanks to recent TESS observations and the focused CHEOPS visit of the transit of TOI-561 e, a good candidate for exomoon searches, the planet's period is finally constrained, allowing us to predict transit times through 2030 with 20-min accuracy. We present an updated version of the internal structure of the four transiting planets. We finally performed a detailed stability analysis, which confirmed the long-term stability of the outer planet TOI-561 f.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Università degli Studi di Padova, INAF - Osservatorio Astronomico di Padova, Universität Bern, Universidade de Coimbra, Stockholm University, Universidade do Porto, Keele University, University of Warwick, Österreichische Akademie der Wissenschaften (ÖAW), University of Chicago, University of Cambridge, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Universität Genf, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Admatis, European Space Astronomy Centre (ESA), University of St. Andrews, INAF-Osservatorio Astrofisico di Torino, Lund University, Aix-Marseille Université, Eötvös Loránd University Budapest, SRON Netherlands Institute for Space Research , Leiden University, Chalmers University of Technology, Università degli Studi di Torino, National & Kapodistrian University of Athens, Université de Liège, European Space Research & Technology Centre (ESA/ESTEC), Technische Universität Graz, MTA Társadalomtudományi Kutatóközpont, Lund Observatory, Université de recherche Paris Sciences et Lettres, Université Paris VI - Pierre-et-Marie-Curie, Università degli Studi di Trento, INAF-Osservatorio Astrofisico di Catania, Eidgenössische Technische Hochschule Zürich, Freie Universität Berlin (FU), Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), HUN-REN-ELTE Exoplanet Research Group, Princeton University
Journal: Monthly Notices of the Royal Astronomical Society
Band: 535
Seiten: 2763-2774
Anzahl der Seiten: 12
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stae2440
Publikationsdatum: 12-2024
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/613a1872-3534-425e-baf3-861e8eaa902b

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