Planets in Mean-Motion Resonances and the System Around HD45364

Correia, A. C. M.; Delisle, J.-B.; Laskar, Jacques

doi:10.1007/978-3-319-30648-3_12-1

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…In particular, chains of planets in mean-motion resonances (MMRs) are 'Rosetta Stones' of the formation and evolution of planetary systems. Indeed, our current understanding of planetary system formation theory implies that such configurations are a common outcome of protoplanetary discs: Slow convergent migration of a pair of planets in quasi-circular orbits leads to a high probability of capture in first-order MMRs -the period ratio of the two planets is equal to (k + 1)/k, with k an integer (Lee & Peale 2002;Correia et al 2018). As the disc strongly damps the eccentricities of the protoplanets, this mechanism can A&A proofs: manuscript no.…”

Section: Introductionmentioning

confidence: 99%

Six transiting planets and a chain of Laplace resonances in TOI-178

Leleu

Alibert²,

Hara³

et al. 2021

A&A

136

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Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent protoplanetary disc was still present. In this context, TOI-178 has been the subject of particular attention since the first TESS observations hinted at the possible presence of a near 2:3:3 resonant chain. Here we report the results of observations from CHEOPS, ESPRESSO, NGTS, and SPECULOOS with the aim of deciphering the peculiar orbital architecture of the system. We show that TOI-178 harbours at least six planets in the super-Earth to mini-Neptune regimes, with radii ranging from 1.152−0.070+0.073 to 2.87−0.13+0.14 Earth radii and periods of 1.91, 3.24, 6.56, 9.96, 15.23, and 20.71 days. All planets but the innermost one form a 2:4:6:9:12 chain of Laplace resonances, and the planetary densities show important variations from planet to planet, jumping from 1.02−0.23+0.28 to 0.177−0.061+0.055 times the Earth’s density between planets c and d. Using Bayesian interior structure retrieval models, we show that the amount of gas in the planets does not vary in a monotonous way, contrary to what one would expect from simple formation and evolution models and unlike other known systems in a chain of Laplace resonances. The brightness of TOI-178 (H = 8.76 mag, J = 9.37 mag, V = 11.95 mag) allows for a precise characterisation of its orbital architecture as well as of the physical nature of the six presently known transiting planets it harbours. The peculiar orbital configuration and the diversity in average density among the planets in the system will enable the study of interior planetary structures and atmospheric evolution, providing important clues on the formation of super-Earths and mini-Neptunes.

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Section: Introductionmentioning

confidence: 99%

Six transiting planets and a chain of Laplace resonances in TOI-178

Leleu

Alibert²,

Hara³

et al. 2021

A&A

136

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show abstract

Section: Introductionmentioning

confidence: 99%

Six transiting planets and a chain of Laplace resonances in TOI-178

Leleu¹

2024

Preprint

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<p class="p1">Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent protoplanetary disc was still present. As unveiled by TESS, CHEOPS, ESPRESSO, NGTS and SPECULOOS, TOI-178 harbours at least six planets in the super-Earth to mini-Neptune regimes, all planets but the innermost one form a 2:4:6:9:12 chain of Laplace resonances, and the planetary densities show important variations from planet to planet. TOI-178 have hence several characteristics that were not previously observed in a single system, making it a key system for the study of processes of formation and evolution of planetary systems. We will review what we know of TOI-178, and what we expect from futur observations.</p>

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Planets in Mean-Motion Resonances and the System Around HD45364

Cited by 2 publications

References 31 publications

Six transiting planets and a chain of Laplace resonances in TOI-178

Six transiting planets and a chain of Laplace resonances in TOI-178

Six transiting planets and a chain of Laplace resonances in TOI-178

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