TOI-942b: A Prograde Neptune in a ∼ 60 Myr Old Multi-transiting System
Article
Article Title | TOI-942b: A Prograde Neptune in a ∼ 60 Myr Old Multi-transiting System |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Wirth, Christopher P. (Author), Zhou, George (Author), Quinn, Samuel N. (Author), Mann, Andrew W. (Author), Bouma, Luke G. (Author), Latham, David W. (Author), Teske, Johanna K. (Author), Wang, Sharon X. (Author), Shectman, Stephen A. (Author), Butler, R. P. (Author) and Crane, Jeffrey D. (Author) |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 917 (2), pp. 1-7 |
Article Number | L34 |
Number of Pages | 7 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/ac13a9 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/ac13a9 |
Abstract | Mapping the orbital obliquity distribution of young planets is one avenue toward understanding mechanisms that sculpt the architectures of planetary systems. TOI-942 is a young field star, with an age of ∼60 Myr, hosting a planetary system consisting of two transiting Neptune-sized planets in 4.3 and 10.1 day period orbits. We observed the spectroscopic transits of the inner Neptune TOI-942b to determine its projected orbital obliquity angle. Through two partial transits, we find the planet to be in a prograde orbit, with a projected obliquity angle of |λ| = 1-33+41 deg. In addition, incorporating the light curve and the stellar rotation period, we find the true 3D obliquity to be 2-23+27 deg. We explored various sources of uncertainties specific to the spectroscopic transits of planets around young active stars, and showed that our reported obliquity uncertainty fully encompassed these effects. TOI-942b is one of the youngest planets to have its obliquity characterized, and one of even fewer residing in a multi-planet system. The prograde orbital geometry of TOI-942b is in line with systems of similar ages, none of which have yet been identified to be in strongly misaligned orbits. |
Keywords | Planetary system formation; Planetary science; Exoplanet dynamics; Exoplanet systems; Exoplanets; Mini Neptunes; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Harvard University, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of North Carolina, United States | |
Princeton University, United States | |
Carnegie Institution of Washington, United States | |
Tsinghua University, China | |
Funding source | Australian Research Council (ARC) Grant ID DE210101893 |
https://research.usq.edu.au/item/q6x6q/toi-942b-a-prograde-neptune-in-a-60-myr-old-multi-transiting-system
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