Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
Article
Article Title | Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Lacedelli, G. (Author), Wilson, T. G. (Author), Malavolta, L. (Author), Hooton, M. J. (Author), Cameron, A. Collier (Author), Alibert, Y. (Author), Mortier, A. (Author), Bonfanti, A. (Author), Haywood, R. D. (Author), Hoyer, S. (Author), Piotto, G. (Author), Bekkelien, A. (Author), Vanderburg, A. M. (Author), Benz, W. (Author), Dumusque, X. (Author), Deline, A. (Author), Lopez-Morales, M. (Author), Borsato, L. (Author), Rice, K. (Author), Fossati, L. (Author), Latham, D. W. (Author), Brandeker, A. (Author), Poretti, E. (Author), Sousa, S. G. (Author), Sozzetti, A. (Author), Salmon, S. (Author), Burke, C. J. (Author), Van Grootel, V. (Author), Fausnaugh, M. M. (Author), Adibekyan, V. (Author), Huang, C. X. (Author), Osborn, H. P. (Author), Mustill, A. J. (Author), Palle, E. (Author), Bourrier, V. (Author), Nascimbeni, V. (Author), Alonso, R. (Author), Anglada, G. (Author), Barczy, T. (Author), Barrado y Navascues, D. (Author), Barros, S. C. C. (Author), Baumjohann, W. (Author), Beck, M. (Author), Beck, T. (Author), Billot, N. (Author), Bonfils, X. (Author), Broeg, C. (Author), Buchhave, L. A. (Author), Cabrera, J. (Author), Charnoz, S. (Author), Cosentino, R. (Author), Csizmadia, Sz (Author), Davies, M. B. (Author), Deleuil, M. (Author), Delrez, L. (Author), Demangeon, O. (Author), Demory, B. -O. (Author), Ehrenreich, D. (Author), Erikson, A. (Author), Esparza-Borges, E. (Author), Floren, H. G. (Author), Fortier, A. (Author), Fridlund, M. (Author), Futyan, D. (Author), Gandolfi, D. (Author), Ghedina, A. (Author), Gillon, M. (Author), Gudel, M. (Author), Guterman, P. (Author), Harutyunyan, A. (Author), Heng, K. (Author), Isaak, K. G. (Author), Jenkins, J. M. (Author), Kiss, L. (Author), Laskar, J. (Author), des Etangs, A. Lecavelier (Author), Lendl, M. (Author), Lovis, C. (Author), Magrin, D. (Author), Marafatto, L. (Author), Martinez Fiorenzano, A. F. (Author), Maxted, P. F. L. (Author), Mayor, M. (Author), Micela, G. (Author), Molinari, E. (Author), Murgas, F. (Author), Narita, N. (Author), Olofsson, G. (Author), Ottensamer, R. (Author), Pagano, I. (Author), Pasetti, A. (Author), Pedani, M. (Author), Pepe, F. A. (Author), Peter, G. (Author), Phillips, D. F. (Author), Pollacco, D. (Author), Queloz, D. (Author), Ragazzoni, R. (Author), Rando, N. (Author), Ratti, F. (Author), Rauer, H. (Author), Ribas, I. (Author), Santos, N. C. (Author), Sasselov, D. (Author), Scandariato, G. (Author), Seager, S. (Author), Segransan, D. (Author), Serrano, L. M. (Author), Simon, A. E. (Author), Smith, A. M. S. (Author), Steinberger, M. (Author), Steller, M. (Author), Szabo, Gy (Author), Thomas, N. (Author), Twicken, J. D. (Author), Udry, S. (Author), Walton, N. (Author) and Winn, J. N. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 511 (3), pp. 4551-4571 |
Number of Pages | 21 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac199 |
Web Address (URL) | https://academic.oup.com/mnras/article/511/3/4551/6516986 |
Abstract | We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of four transiting planets, namely TOI-561 b (P = 0.45 d, R = 1.42 R-circle plus, M = 2.0 M-circle plus), c (P = 10.78 d, R = 2.91 R-circle plus, M = 5.4 M-circle plus), d (P = 25.7 d, R = 2.82 R-circle plus, M = 13.2 M-circle plus), and e (P = 77 d, R = 2.55 R-circle plus, M = 12.6 R-circle plus). Moreover, we identify an additional, long-period signal (>450 d) in the RVs, which could be due to either an external planetary companion or to stellar magnetic activity. The precise masses and radii obtained for the four planets allowed us to conduct interior structure and atmospheric escape modelling. TOI-561 b is confirmed to be the lowest density (rho(b) = 3.8 +/- 0.5 g cm(-3)) ultra-short period (USP) planet known to date, and the low metallicity of the host star makes it consistent with the general bulk density-stellar metallicity trend. According to our interior structure modelling, planet b has basically no gas envelope, and it could host a certain amount of water. In contrast, TOI-561 c, d, and e likely retained an H/He envelope, in addition to a possibly large water layer. The inferred planetary compositions suggest different atmospheric evolutionary paths, with planets b and c having experienced significant gas loss, and planets d and e showing an atmospheric content consistent with the original one. The uniqueness of the USP planet, the presence of the long-period planet TOI-561 e, and the complex architecture make this system an appealing target for follow-up studies. |
Keywords | techniques: photometric – techniques: radial velocities – planets and satellites: fundamental parameters – planetsand satellites: interiors – stars: individual: TOI-561 (TIC 377064495, Gaia EDR3 3850421005290172416); Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Padua, Italy |
University of St Andrews, United Kingdom | |
Museum of the Astronomical Observatory of Padua, Italy | |
University of Bern, Switzerland | |
National Institute for Astrophysics, Italy | |
University of Cambridge, United Kingdom | |
Austrian Academy of Sciences, Austria | |
University of Exeter, United Kingdom | |
Aix-Marseille University, France | |
University of Padova, Italy | |
University of Geneva, Switzerland | |
Massachusetts Institute of Technology, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Edinburgh, United Kingdom | |
Stockholm University, Sweden | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of Porto, Portugal | |
INAF Astrophysical Observatory of Turin, Italy | |
University of Liege, Belgium | |
Centre for Astrophysics | |
Lund University, Sweden | |
University of La Laguna, Spain | |
University of Barcelona, Spain | |
Admatis, Hungary | |
Astrobiology Center, Spain | |
Grenoble Alpes University, France | |
Technical University of Denmark, Denmark | |
German Aerospace Centre, Germany | |
University of Paris, France | |
Leiden University, Netherlands | |
University of Turin, Italy | |
Galileo Galilei Foundation, Spain | |
University of Vienna, Austria | |
European Space Agency, France | |
NASA Ames Research Center, United States | |
Konkoly Observatory, Hungary | |
Sorbonne University, France | |
Keele University, United Kingdom | |
Palermo Astronomical Observatory, Italy | |
Cagliari Observatory, Italy | |
P&P Software, Switzerland | |
University of Warwick, United Kingdom | |
Eotvos Lorand University (ELTE), Hungary | |
Princeton University, United States |
https://research.usq.edu.au/item/q7248/investigating-the-architecture-and-internal-structure-of-the-toi-561-system-planets-with-cheops-harps-n-and-tess
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