Two mini-Neptunes Transiting the Adolescent K-star HIP 113103 Confirmed with TESS and CHEOPS
Article
Article Title | Two mini-Neptunes Transiting the Adolescent K-star HIP 113103 Confirmed with TESS and CHEOPS |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Lowson, N., Zhou, G., Huang, C. X., Wright, D. J., Edwards, B., Nabbie, E., Venner A., Quinn, S. N., Collins, K. A., Gillen, E., Battley, M., Triaud, A., Hellier, C., Seager, S., Winn, J., Jenkins, J. M., Wohler, B., Shporer, A., Schwarz, R., Murgas, F., Palle, E., Anderson, D. R., West, R. G., Wittenmyer, R. A., Bowler, B. P., Horner, J., Kane, S. R., Kielkopf, J., Plavchan, P., Zhang, H., Fairnington, T., Okumura, J., Mengel, M. and Addison, B. C. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 527 (1), p. 1146–1162 |
Number of Pages | 17 |
Year | 2023 |
01 Sep 2023 | |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stad2756 |
Web Address (URL) | https://academic.oup.com/mnras/article/527/1/1146/7271784 |
Abstract | We report the discovery of two mini-Neptunesin near 2:1 resonance orbits(P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c) around the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first identified from the TESS mission, and was confirmed via additional photometric and spectroscopic observations, including a ∼17.5 h observation for the transits of both planets using ESA CHEOPS. We place ≤4.5 min and ≤2.5 min limits on the absence of transit timing variations over the 3 yr photometric baseline, allowing further constraints on the orbital eccentricities of the system beyond that available from the photometric transit duration alone. With a planetary radius of Rp = 1.829+0.096 −0.067 R⊕, HIP 113103 b resides within the radius gap, and this might provide invaluable information on the formation disparities between super-Earths and mini-Neptunes. Given the larger radius Rp = 2.40+0.10 −0.08 R⊕ for HIP 113103 c, and close proximity of both planets to HIP 113103, it is likely that HIP 113103 b might have lost (or is still losing) its primordial atmosphere. We therefore present simulated atmospheric transmission spectra of both planets using JWST, HST, and Twinkle. It demonstrates a potential metallicity difference (due to differences in their evolution) would be a challenge to detect if the atmospheres are in chemical equilibrium. As one of the brightest multi sub-Neptune planet systems suitable for atmosphere follow up, HIP 113103 b and HIP 113103 c could provide insight on planetary evolution for the sub-Neptune K-star population |
Keywords | techniques: spectroscopic; techniques: radial velocities; planets and |
Related Output | |
Is part of | Characterising Exoplanets Using Ground-based & Space-based Facilities |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510905. Solar system planetary science (excl. planetary geology) |
Public Notes | This article is part of a UniSQ Thesis by publication. See Related Output. |
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |
Byline Affiliations | Centre for Astrophysics |
Netherlands Institute for Space Research, Netherlands | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Queen Mary University of London, United Kingdom | |
Cavendish Laboratory, United Kingdom | |
University of Birmingham, United Kingdom | |
Keele University, United Kingdom | |
Massachusetts Institute of Technology, United States | |
Princeton University, United States | |
NASA Ames Research Center, United States | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of La Laguna, Spain | |
University of Warwick, United Kingdom | |
University of Texas at Austin, United States | |
University of California Riverside, United Sates | |
University of Louisville, United States | |
George Mason University, United States | |
Chinese Academy of Sciences, China |
https://research.usq.edu.au/item/z2934/two-mini-neptunes-transiting-the-adolescent-k-star-hip-113103-confirmed-with-tess-and-cheops
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