TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain
Article
Isaacson, Howard. 2023. "TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain." The Astronomical Journal. 165 (2). https://doi.org/10.3847/1538-3881/aca327
Article Title | TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Isaacson, Howard |
Journal Title | The Astronomical Journal |
Journal Citation | 165 (2) |
Article Number | 33 |
Number of Pages | 37 |
Year | 2023 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aca327 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aca327/meta |
Abstract | Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMRs). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI-1136, a 700 ± 150 Myr old G star hosting at least six transiting planets between ?2 and 5 R ?. The orbital period ratios deviate from exact commensurability by only 10?4, smaller than the ?10?2 deviations seen in typical Kepler near-resonant systems. A transit-timing analysis measured the masses of the planets (3-8M ?) and demonstrated that the planets in TOI-1136 are in true resonances with librating resonant angles. Based on a Rossiter-McLaughlin measurement of planet d, the star’s rotation appears to be aligned with the planetary orbital planes. The well-aligned planetary system and the lack of a detected binary companion together suggest that TOI-1136's resonant chain formed in an isolated, quiescent disk with no stellar flyby, disk warp, or significant axial asymmetry. With period ratios near 3:2, 2:1, 3:2, 7:5, and 3:2, TOI-1136 is the first known resonant chain involving a second-order MMR (7:5) between two first-order MMRs. The formation of the delicate 7:5 resonance places strong constraints on the system’s migration history. Short-scale (starting from ?0.1 au) Type-I migration with an inner disk edge is most consistent with the formation of TOI-1136. A low disk surface density (?1 au ? 103g cm?2; lower than the minimum-mass solar nebula) and the resultant slower migration rate likely facilitated the formation of the 7:5 second-order MMR. © 2023. The Author(s). Published by the American Astronomical Society. |
Keywords | Exoplanet dynamics; Exoplanet migration; Exoplanet formation; Exoplanet evolution |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of California Berkeley, United States |
Centre for Astrophysics |
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https://research.usq.edu.au/item/z258x/toi-1136-is-a-young-coplanar-aligned-planetary-system-in-a-pristine-resonant-chain
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