The planetary system around HD 190622 (TOI-1054)

Author(s): J. Cabrera, D. Gandolfi, L. M. Serrano, Sz Csizmadia, J. A. Egger, Philipp Baumeister, A. Krenn, W. Benz, A. Deline, H. G. Florén, A. Collier Cameron, V. Adibekyan, Y. Alibert, S. E. Bellomo, L. Delrez, L. Fossati, A. Fortier, S. Grziwa, S. Hoyer, A. Bonfanti, S. Salmon, S. G. Sousa, T. G. Wilson, J. Alarcón, R. Alonso, G. Anglada Escudé, T. Bárczy, O. Barragán, D. Barrado, S. C.C. Barros, W. Baumjohann, M. Beck, T. Beck, L. M. Bernabò, N. Billot, X. Bonfils, L. Borsato, A. Brandeker, C. Broeg, O. Carrión-González, S. Charnoz, D. R. Ciardi, W. D. Cochran, K. I. Collins, K. I. Collins, D. M. Conti, M. B. Davies, H. J. Deeg, M. Deleuil, O. D.S. Demangeon, B. O. Demory, D. Ehrenreich, A. Erikson, M. Esposito, M. Fridlund, M. Gillon, E. Goffo, M. Güdel, E. W. Guenther, J. V. Harre, K. Heng, M. J. Hooton, K. G. Isaak, J. M. Jenkins, L. L. Kiss, E. Knudstrup, K. W.F. Lam, J. Laskar, A. Lecavelier Des Etangs, M. Lendl, C. Lovis, R. Luque, D. Magrin, P. F.L. Maxted, A. Muresan, V. Nascimbeni, G. Olofsson, H. P. Osborn, H. L.M. Osborne, R. Ottensamer, I. Pagano, E. Pallé, C. M. Persson, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, S. Redfield, I. Ribas, G. R. Ricker, F. Rodler, N. C. Santos, G. Scandariato, S. Seager, D. Ségransan, A. E. Simon, A. M.S. Smith, M. Steller, Gy M. Szabó, N. Thomas, N. Tosi, J. D. Twicken, S. Udry, V. Van Eylen, V. Van Grootel, N. A. Walton, J. N. Winn
Abstract: Context. Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constraints improve our understanding of planetary formation processes such as the delivery of volatile-rich planetesimals from beyond the ice line into the inner planetary system. Additional constraints may come from studies of the atmosphere, but almost all such studies of the atmosphere investigate the detection of certain species, and abundances are not routinely quantitatively measured. Aims. Accurate measurements of planetary bulk parameters-that is, mass and density-provide constraints on the inner structure and chemical composition of transiting planets. This information provides insight into properties such as the amounts of volatile species, which in turn can be related to formation and evolution processes. Methods. The Transiting Exoplanet Survey Satellite (TESS) reported a planetary candidate around HD 190622 (TOI-1054), which was subsequently validated and found to merit further characterization with photometric and spectroscopic facilities. The KESPRINT collaboration used data from the High Accuracy Radial Velocity Planet Searcher (HARPS) to independently confirm the planetary candidate, securing its mass, and revealing the presence of an outer giant planet in the system. The CHEOPS consortium invested telescope time in the transiting target in order to reduce the uncertainty on the radius, improving the characterization of the planet. Results. We present the discovery and characterization of the planetary system around HD 190622 (TOI-1054). This system hosts one transiting planet, which is smaller than Neptune (3.087-0.053+0.058REarth, 7.7 ± 1.0 MEarth) but has a similar bulk density (1.43 ± 0.21 g cm-3) and an orbital period of 16 days; and a giant planet, not known to be transiting, with a minimum mass of 227.0 ± 6.7 MEarth in an orbit with a period of 315 days. Conclusions. Our measurements constrain the structure and composition of the transiting planet. HD 190622b has singular properties among the known population of transiting planets, which we discuss in detail. Among the sub-Neptune-sized planets known today, this planet stands out because of its large gas content.
Organisation(s): Department of Biochemistry and Cell Biology, Department of Astrophysics
External organisation(s): Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Università degli Studi di Torino, Universität Bern, Österreichische Akademie der Wissenschaften (ÖAW), Université de Genève, Stockholm University, University of St. Andrews, Universidade do Porto, Université de Liège, Universität zu Köln, Aix-Marseille Université, European Southern Observatory (Germany), Institute of Astrophysics of the Canary Islands, University of La Laguna, Spanish National Research Council (CSIC), CSIC - Real Jardin Botanico (RJB), Institute of Space Studies of Catalonia (IEEC), Admatis Ltd., University of Oxford, European Space Astronomy Centre (ESA), University of Grenoble Alpes, Osservatorio Astronomico, Technische Universität Berlin, Université de recherche Paris Sciences et Lettres, Université de Paris, California Institute of Technology (Caltech), National Aeronautics & Space Administration (NASA), University of Texas, Austin, Harvard-Smithsonian Center for Astrophysics, American Association of Variable Star Observers (AAVSO), Lund University, Thüringer Landessternwarte Tautenburg, Leiden University, Chalmers University of Technology, University of Warwick, University of Cambridge, Science and Operations Department - Science Division (SCI-SC), Eötvös Loránd Research Network, Eötvös Loránd University Budapest, Aarhus University, Université Paris VI - Pierre-et-Marie-Curie, Centre National De La Recherche Scientifique (CNRS), University of Chicago, Keele University, Massachusetts Institute of Technology, University College London, INAF-Osservatorio Astrofisico di Catania, University of Padova, Eidgenössische Technische Hochschule Zürich, Freie Universität Berlin (FU), Wesleyan University, SETI Institute, Princeton University
Journal: Astronomy and Astrophysics
Volume: 675
No. of pages: 14
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202245774
Publication date: 07-2023
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics, 103038 Space exploration
Keywords
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/730c8e76-68e2-47a8-a7a7-9f739d1406d1

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