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Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N and TESS by Lacedelli, G.; Wilson, T. G.; Malavolta, L.; Hooton, M. J.; Cameron, A. Collier; Alibert, Y.; Mortier, A.; Bonfanti, A.; Haywood, R. D.; Hoyer, S.; Piotto, G.; Bekkelien, A.; Vanderburg, A. M.; Benz, W.; Dumusque, X.; Deline, A.; López-Morales, M.; Borsato, L.; Rice, K.; Fossati, L.; Latham, D. W.; Brandeker, A.; Poretti, E.; Sousa, S. G.; Sozzetti, A.; Salmon, S.; Burke, C. J.; Van Grootel, V.; Fausnaugh, M. M.; Adibekyan, V.; Huang, C. X.; Osborn, H. P.; Mustill, A. J.; Pallé, E.; Bourrier, V.; Nascimbeni, V.; Alonso, R.; Anglada, G.; Bárczy, T.; Navascues, D. Barrado y; Barros, S. C. C.; Baumjohann, W.; Beck, M.; Beck, T.; Billot, N.; Bonfils, X.; Broeg, C.; Buchhave, L. A.; Cabrera, J.; Charnoz, S.; Cosentino, R.; Csizmadia, Sz.; Davies, M. B.; Deleuil, M.; Delrez, L.; Demangeon, O.; Demory, B. -O.; Ehrenreich, D.; Erikson, A.; Esparza-Borges, E.; Florén, H. -G.; Fortier, A.; Fridlund, M.; Futyan, D.; Gandolfi, D.; Ghedina, A.; Gillon, M.; Güdel, M.; Gutermann, P.; Harutyunyan, A.; Heng, K.; Isaak, K. G.; Jenkins, J. M.; Kiss, L.; Laskar, J.; Etangs, A. Lecavelier des; Lendl, M.; Lovis, C.; Magrin, D.; Marafatto, L.; Fiorenzano, A. F. Martinez; Maxted, P. F. L.; Mayor, M.; Micela, G.; Molinari, E.; Murgas, F.; Narita, N.; Olofsson, G.; Ottensamer, R.; Pagano, I.; Pasetti, A.; Pedani, M.; Pepe, F. A.; Peter, G.; Phillips, D. F.; Pollacco, D.; Queloz, D.; Ragazzoni, R.; Rando, N.; Ratti, F.; Rauer, H.; Ribas, I.; Santos, N. C.; Sasselov, D.; Scandariato, G.; Seager, S.; Ségransan, D.; Serrano, L. M.; Simon, A. E.; Smith, A. M. S.; Steinberger, M.; Steller, M.; Szabó, Gy.; Thomas, N.; Twicken, J. D.; Udry, S.; Walton, N.; Winn, J. N. is a scholarly article available to read on EtoBox.
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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$_\oplus$, $M = 2.0$ M$_\oplus$), c ($P = 10.78$ d, $R = 2.91$ R$_\oplus$, $M = 5.4$ M$_\oplus$), d ($P = 25.7$ d, $R = 2.82$ R$_\oplus$, $M = 13.2$ M$_\oplus$) and e ($P = 77$ d, $R = 2.55$ R$_\oplus$, $M = 12.6$ M$_\oplus$). 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 ($\rho_{\rm b} = 3.8 \pm 0.5$ 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
- Author
- Lacedelli, G.; Wilson, T. G.; Malavolta, L.; Hooton, M. J.; Cameron, A. Collier; Alibert, Y.; Mortier, A.; Bonfanti, A.; Haywood, R. D.; Hoyer, S.; Piotto, G.; Bekkelien, A.; Vanderburg, A. M.; Benz, W.; Dumusque, X.; Deline, A.; López-Morales, M.; Borsato, L.; Rice, K.; Fossati, L.; Latham, D. W.; Brandeker, A.; Poretti, E.; Sousa, S. G.; Sozzetti, A.; Salmon, S.; Burke, C. J.; Van Grootel, V.; Fausnaugh, M. M.; Adibekyan, V.; Huang, C. X.; Osborn, H. P.; Mustill, A. J.; Pallé, E.; Bourrier, V.; Nascimbeni, V.; Alonso, R.; Anglada, G.; Bárczy, T.; Navascues, D. Barrado y; Barros, S. C. C.; Baumjohann, W.; Beck, M.; Beck, T.; Billot, N.; Bonfils, X.; Broeg, C.; Buchhave, L. A.; Cabrera, J.; Charnoz, S.; Cosentino, R.; Csizmadia, Sz.; Davies, M. B.; Deleuil, M.; Delrez, L.; Demangeon, O.; Demory, B. -O.; Ehrenreich, D.; Erikson, A.; Esparza-Borges, E.; Florén, H. -G.; Fortier, A.; Fridlund, M.; Futyan, D.; Gandolfi, D.; Ghedina, A.; Gillon, M.; Güdel, M.; Gutermann, P.; Harutyunyan, A.; Heng, K.; Isaak, K. G.; Jenkins, J. M.; Kiss, L.; Laskar, J.; Etangs, A. Lecavelier des; Lendl, M.; Lovis, C.; Magrin, D.; Marafatto, L.; Fiorenzano, A. F. Martinez; Maxted, P. F. L.; Mayor, M.; Micela, G.; Molinari, E.; Murgas, F.; Narita, N.; Olofsson, G.; Ottensamer, R.; Pagano, I.; Pasetti, A.; Pedani, M.; Pepe, F. A.; Peter, G.; Phillips, D. F.; Pollacco, D.; Queloz, D.; Ragazzoni, R.; Rando, N.; Ratti, F.; Rauer, H.; Ribas, I.; Santos, N. C.; Sasselov, D.; Scandariato, G.; Seager, S.; Ségransan, D.; Serrano, L. M.; Simon, A. E.; Smith, A. M. S.; Steinberger, M.; Steller, M.; Szabó, Gy.; Thomas, N.; Twicken, J. D.; Udry, S.; Walton, N.; Winn, J. N.
- Published
- 2022
- Language
- EN