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1.	Osborne, H. L.M., et al. (author) TOI-544 b: a potential water-world inside the radius valley in a two-planet system 2024 In: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 527:4, s. 11138-11157 Journal article (peer-reviewed)abstract We report on the precise radial velocity follow-up of TOI-544 (HD 290498),ã bright K star ( V = 10.8), which hostsã small transiting planet recently disco v ered by the Trãnsiting Exoplanet Survey Satellite (TESS) . We collected 122 high-resolution High Accuracy Radial velocity Planet Searcher (HARPS)ãnd HARPS-N spectra to spectroscopically confirm the transiting planetãnd measure its mass. The nearly 3-yr baseline of our follow-upãllowed us to unveil the presence ofãnãdditional, non-transiting, longer-period companion planet. We derivedã radiusãnd mass for the inner planet, TOI-544 b, of 2.018 ±0.076 R⊙and 2.89 ±0.48 M⊙, respectively, which givesã bulk density of 1 . 93 + 0 . 30 -0 . 25 g cm -3 . TOI-544 c hasã minimum mass of 21.5 ±2.0 M⊙and orbital period of 50.1 ±0.2 d. The low density of planet-b implies that it has eitherãn Earth-like rocky core withã hydrogenãtmosphere, orã composition which harboursã significant fraction of water. The composition interpretation is degenerate depending on the specific choice of planet interior models used. Additionally, TOI-544 b hasãn orbital period of 1.55 dãnd equilibrium temperature of 999 ±14 K, placing it within the predicted location of the radius valley, where few planetsãre expected. TOI-544 b isã top target for futureãtmospheric observations, for example with JWST , which would enable better constraints of the planet composition.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Nowak, G. (1); Esposito, M. (1); Hirano, T (1); Knudstrup, E. (1); Fridlund, Malcolm, 1 ... (1); Gandolfi, D. (1); show more...; Lam, K. W.F. (1); Palle, Enric (1); Redfield, S. (1); Barragán, O. (1); Persson, Carina, 196 ... (1); Korth, J. (1); Livingston, J.H. (1); Cochran, William D. (1); Deeg, H. (1); Hatzes, A. (1); Van Eylen, Vincent (1); Luque, R. (1); Murgas, F. (1); Rodler, F. (1); Goffo, E. (1); Osborne, H. L. M. (1); Serrano, L. M. (1); Carleo, Ilaria (1); Weeks, A (1); Alarcon, Javier (1); Diaz, Matias R. (1); Hellier, Coel (1); Orell-Miquel, J. (1); Jenkins, James S. (1); Stangret, M. (1); Casasayas-Barris, Nú ... (1); Albrecht, S. H. (1); Alqasim, A. (1); Gili, M. Garbaccio (1); show less...

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

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2024 (1)

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