Discovery of TOI-1260d and the characterization of the multiplanet system

Autor(en)

K. W.F. Lam, J. Cabrera, M. J. Hooton, Y. Alibert, A. Bonfanti, M. Beck, A. Deline, H. G. Floren, A. E. Simon, L. Fossati, C. M. Persson, M. Fridlund, S. Salmon, S. Hoyer, H. P. Osborn, T. G. Wilson, I. Y. Georgieva, Gr Nowak, R. Luque, J. A. Egger, V. Adibekyan, R. Alonso, G. A. Escude, T. Bárczy, D. Barrado, S. C.C. Barros, W. Baumjohann, T. Beck, A. Bekkelien, W. Benz, N. Billot, X. Bonfils, A. Brandeker, C. Broeg, S. Charnoz, A. C. Cameron, Sz Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. D.S. Demangeon, B. O. Demory, D. Ehrenreich, A. Erikson, A. Fortier, D. Futyan, D. Gandolfi, M. Gillon, M. Guedel, P. Guterman, J. Laskar, D. W. Latham, A. Lecavelier Des Etangs, M. Lendl, C. Lovis, K. Heng, K. G. Isaak, L. Kiss, D. Magrin, P. F.L. Maxted, V. Nascimbeni, G. Olofsson, R. Ottensamer, I. Pagano, E. Palle, G. Peter, G. Piotto, D. Pollacco, D. Queloz, I. Ribas, R. Ragazzoni, N. Rando, H. Rauer, N. C. Santos, G. Scandariato, S. Seager, D. Segransan, L. M. Serrano, A. M.S. Smith, S. G. Sousa, M. Steller, G. M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton, J. N. Winn

Abstrakt

We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angular resolution images, spectroscopy, and archival imagery. Precise photometric monitoring with CHEOPS allows to improve the constraints on the parameters of the system, improving our knowledge on their composition. The improved radii of TOI-1260b and TOI-1260c are 2.36 ± 0.06 R⊕, 2.82 ± 0.08 R⊕ , respectively while the newly discovered third planet has a radius of 3.09 ± 0.09 R⊕. The radius uncertainties are in the range of 3 per cent, allowing a precise interpretation of the interior structure of the three planets. Our planet interior composition model suggests that all three planets in the TOI-1260 system contains some fraction of gas. The innermost planet TOI-1260b has most likely lost all of its primordial hydrogen-dominated envelope. Planets c and d were also likely to have experienced significant loss of atmospheric through escape, but to a lesser extent compared to planet b.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Universität Bern, University of Cambridge, Österreichische Akademie der Wissenschaften (ÖAW), Universität Genf, Stockholm University, Leiden University, Aix-Marseille Université, Massachusetts Institute of Technology, University of St. Andrews, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, University of Chicago, Universidade do Porto, Universitat Autònoma de Barcelona , Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), Admatis, European Space Astronomy Centre (ESA), Université Grenoble-Alpes, Université de Paris, Lund University, Université de Liège, Università degli Studi di Torino, Institute National Des Sciences De L'univers Division Technique, Université de recherche Paris Sciences et Lettres, Harvard-Smithsonian Center for Astrophysics, Université Paris VI - Pierre-et-Marie-Curie, University of Warwick, European Space Research & Technology Centre (ESA/ESTEC), MTA Társadalomtudományi Kutatóközpont, Eötvös Loránd University Budapest, The University of Sydney, INAF - Osservatorio Astronomico di Padova, Keele University, INAF-Osservatorio Astrofisico di Catania, Eidgenössische Technische Hochschule Zürich, Università degli Studi di Padova, Technische Universität Berlin, Freie Universität Berlin (FU), Princeton University

Journal

Monthly Notices of the Royal Astronomical Society

Band

519

Seiten

1437-1451

Anzahl der Seiten

15

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stac3639

Publikationsdatum

02-2023

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik, 103038 Weltraumforschung

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d81e12d8-4a7c-425b-bc7e-8d27c2eb89c3