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1.	Serrano, L. M., et al. (author) A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system 2022 In: Nature Astronomy. - : Springer Science and Business Media LLC. - 2397-3366. ; 6:6, s. 736-750 Journal article (peer-reviewed)abstract It is commonly accepted that exoplanets with orbital periods shorter than one day, also known as ultra-short-period (USP) planets, formed further out within their natal protoplanetary disks before migrating to their current-day orbits via dynamical interactions. One of the most accepted theories suggests a violent scenario involving high-eccentricity migration followed by tidal circularization. Here we present the discovery of a four-planet system orbiting the bright (V = 10.5) K6 dwarf star TOI-500. The innermost planet is a transiting, Earth-sized USP planet with an orbital period of ~13 hours, a mass of 1.42 ± 0.18 M⊕, a radius of 1.166−0.058+0.061R⊕ and a mean density of 4.89−0.88+1.03gcm−3. Via Doppler spectroscopy, we discovered that the system hosts 3 outer planets on nearly circular orbits with periods of 6.6, 26.2 and 61.3 days and minimum masses of 5.03 ± 0.41 M⊕, 33.12 ± 0.88 M⊕ and 15.05−1.11+1.12M⊕, respectively. The presence of both a USP planet and a low-mass object on a 6.6-day orbit indicates that the architecture of this system can be explained via a scenario in which the planets started on low-eccentricity orbits then moved inwards through a quasi-static secular migration. Our numerical simulations show that this migration channel can bring TOI-500 b to its current location in 2 Gyr, starting from an initial orbit of 0.02 au. TOI-500 is the first four-planet system known to host a USP Earth analogue whose current architecture can be explained via a non-violent migration scenario.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Mann, A. (1); Esposito, M. (1); Csizmadia, Szilard (1); Fridlund, Malcolm, 1 ... (1); Gandolfi, D. (1); Lam, K. W.F. (1); show more...; Palle, Enric (1); Redfield, S. (1); Barragán, O. (1); Persson, Carina, 196 ... (1); Grziwa, S. (1); Guenther, E. W. (1); Dai, Fei (1); Livingston, J.H. (1); Winn, J. N. (1); Smith, Alexis M. S. (1); Albrecht, Simon (1); Cochran, William D. (1); Deeg, H. (1); Hatzes, A. (1); Van Eylen, Vincent (1); Latham, D. W. (1); Luque, R. (1); Murgas, F. (1); Twicken, J. D. (1); Rodler, F. (1); Goffo, E. (1); Korth, Judith, 1987 (1); Osborne, H. L. M. (1); Seager, S. (1); Serrano, L. M. (1); Ziegler, C. (1); Trifonov, T. (1); Mustill, Alexander J (1); Alarcon, Javier (1); Howell, S.B. (1); Bellomo, Salvatore E ... (1); Collins, Karen A. (1); Collins, Kevin I. (1); Jenkins, Jon M. (1); Ricker, George R. (1); Diaz, Matias R. (1); Hellier, Coel (1); Fausnaugh, Michael (1); Jensen, Eric L. N. (1); Daylan, Tansu (1); Rowden, Pamela (1); Georgieva, Iskra (1); Rudat, Alexander (1); Vanderspeck, Roland (1); show less...

University: Lund University (1); Chalmers University of Technology (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1); Engineering and Technology (1)

Year: 2022 (1)

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