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| Verfasst von: | Luque, Rafael [VerfasserIn]  |
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| | Serrano, L. M. [VerfasserIn] |
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| | Molaverdikhani, Karan [VerfasserIn] |
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| | Nixon, M. C. [VerfasserIn] |
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| | Livingston, J. H. [VerfasserIn] |
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| | Guenther, E. W. [VerfasserIn] |
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| | Pallé, E. [VerfasserIn] |
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| | Madhusudhan, N. [VerfasserIn] |
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| | Nowak, G. [VerfasserIn] |
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| | Korth, J. [VerfasserIn] |
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| | Cochran, W. D. [VerfasserIn] |
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| | Hirano, T. [VerfasserIn] |
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| | Chaturvedi, P. [VerfasserIn] |
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| | Goffo, E. [VerfasserIn] |
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| | Albrecht, S. [VerfasserIn] |
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| | Barragán, O. [VerfasserIn] |
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| | Briceño, C. [VerfasserIn] |
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| | Cabrera, J. [VerfasserIn] |
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| | Charbonneau, D. [VerfasserIn] |
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| | Cloutier, R. [VerfasserIn] |
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| | Collins, K. A. [VerfasserIn] |
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| | Collins, K. I. [VerfasserIn] |
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| | Colón, K. D. [VerfasserIn] |
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| | Crossfield, I. J. M. [VerfasserIn] |
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| | Csizmadia, Sz [VerfasserIn] |
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| | Dai, F. [VerfasserIn] |
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| | Deeg, H. J. [VerfasserIn] |
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| | Esposito, M. [VerfasserIn] |
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| | Fridlund, M. [VerfasserIn] |
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| | Gandolfi, D. [VerfasserIn] |
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| | Georgieva, I. [VerfasserIn] |
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| | Glidden, A. [VerfasserIn] |
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| | Goeke, R. F. [VerfasserIn] |
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| | Grziwa, S. [VerfasserIn] |
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| | Hatzes, A. P. [VerfasserIn] |
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| | Henze, C. E. [VerfasserIn] |
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| | Howell, S. B. [VerfasserIn] |
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| | Irwin, J. [VerfasserIn] |
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| | Jenkins, J. M. [VerfasserIn] |
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| | Jensen, E. L. N. [VerfasserIn] |
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| | Kábath, P. [VerfasserIn] |
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| | Kidwell, R. C. [VerfasserIn] |
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| | Kielkopf, J. F. [VerfasserIn] |
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| | Knudstrup, E. [VerfasserIn] |
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| | Lam, K. W. F. [VerfasserIn] |
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| | Latham, D. W. [VerfasserIn] |
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| | Lissauer, J. J. [VerfasserIn] |
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| | Mann, A. W. [VerfasserIn] |
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| | Matthews, E. C. [VerfasserIn] |
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| | Mireles, I. [VerfasserIn] |
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| | Narita, N. [VerfasserIn] |
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| | Paegert, M. [VerfasserIn] |
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| | Persson, C. M. [VerfasserIn] |
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| | Redfield, S. [VerfasserIn] |
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| | Ricker, G. R. [VerfasserIn] |
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| | Rodler, F. [VerfasserIn] |
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| | Schlieder, J. E. [VerfasserIn] |
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| | Scott, N. J. [VerfasserIn] |
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| | Seager, S. [VerfasserIn] |
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| | Šubjak, J. [VerfasserIn] |
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| | Tan, T. G. [VerfasserIn] |
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| | Ting, E. B. [VerfasserIn] |
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| | Vanderspek, R. [VerfasserIn] |
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| | Eylen, V. Van [VerfasserIn] |
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| | Winn, J. N. [VerfasserIn] |
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| | Ziegler, C. [VerfasserIn] |
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| Titel: | A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776 |
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| Verf.angabe: | R. Luque, L.M. Serrano, K. Molaverdikhani, M.C. Nixon, J.H. Livingston, E.W. Guenther, E. Pallé, N. Madhusudhan, G. Nowak, J. Korth, W.D. Cochran, T. Hirano, P. Chaturvedi, E. Goffo, S. Albrecht, O. Barragán, C. Briceño, J. Cabrera, D. Charbonneau, R. Cloutier, K.A. Collins, K.I. Collins, K.D. Colón, I.J.M. Crossfield, Sz. Csizmadia, F. Dai, H.J. Deeg, M. Esposito, M. Fridlund, D. Gandolfi, I. Georgieva, A. Glidden, R.F. Goeke, S. Grziwa, A.P. Hatzes, C.E. Henze, S.B. Howell, J. Irwin, J.M. Jenkins, E.L.N. Jensen, P. Kábath, R.C. Kidwell, J.F. Kielkopf, E. Knudstrup, K.W.F. Lam, D.W. Latham, J.J. Lissauer, A.W. Mann, E.C. Matthews, I. Mireles, N. Narita, M. Paegert, C.M. Persson, S. Redfield, G.R. Ricker, F. Rodler, J.E. Schlieder, N.J. Scott, S. Seager, J. Šubjak, T.G. Tan, E.B. Ting, R. Vanderspek, V. Van Eylen, J.N. Winn, and C. Ziegler |
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| E-Jahr: | 2021 |
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| Jahr: | 05 January 2021 |
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| Umfang: | 24 S. |
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| Fussnoten: | Gesehen am 07.05.2022 |
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| Titel Quelle: | Enthalten in: Astronomy and astrophysics |
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| Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
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| Jahr Quelle: | 2021 |
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| Band/Heft Quelle: | 645(2021), Artikel-ID A41, Seite 1-24 |
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| ISSN Quelle: | 1432-0746 |
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| Abstract: | We report the discovery and characterization of two transiting planets around the bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M = 0.54 ± 0.03 M⊙) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TESS). Combining the TESS photometry with HARPS radial velocities, as well as ground-based follow-up transit observations from the MEarth and LCOGT telescopes, for the inner planet, TOI-776 b, we measured a period of Pb = 8.25 d, a radius of Rb = 1.85 ± 0.13 R⊕, and a mass of Mb = 4.0 ± 0.9 M⊕; and for the outer planet, TOI-776 c, a period of Pc = 15.66 d, a radius of Rc = 2.02 ± 0.14 R⊕, and a mass of Mc = 5.3 ± 1.8 M⊕. The Doppler data shows one additional signal, with a period of ~34 d, associated with the rotational period of the star. The analysis of fifteen years of ground-based photometric monitoring data and the inspection of different spectral line indicators confirm this assumption. The bulk densities of TOI-776 b and c allow for a wide range of possible interior and atmospheric compositions. However, both planets have retained a significant atmosphere, with slightly different envelope mass fractions. Thanks to their location near the radius gap for M dwarfs, we can start to explore the mechanism(s) responsible for the radius valley emergence around low-mass stars as compared to solar-like stars. While a larger sample of well-characterized planets in this parameter space is still needed to draw firm conclusions, we tentatively estimate that the stellar mass below which thermally-driven mass loss is no longer the main formation pathway for sculpting the radius valley is between 0.63 and 0.54 M⊙. Due to the brightness of the star, the TOI-776 system is also an excellent target for the James Webb Space Telescope, providing a remarkable laboratory in which to break the degeneracy in planetary interior models and to test formation and evolution theories of small planets around low-mass stars. |
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| DOI: | doi:10.1051/0004-6361/202039455 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext ; Verlag: https://doi.org/10.1051/0004-6361/202039455 |
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| | Volltext: https://www.aanda.org/articles/aa/abs/2021/01/aa39455-20/aa39455-20.html |
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| | DOI: https://doi.org/10.1051/0004-6361/202039455 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 1801160252 |
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| Verknüpfungen: | → Zeitschrift |
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¬A¬ planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776 / Luque, Rafael [VerfasserIn]; 05 January 2021 (Online-Ressource)
