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. N., Jenkins, J. M., Wohler, B., Shporer, A., Schwarz, R. P., Murgas, F., Pallé, E., Anderson, D. R., West, R. G., Wittenmyer, R. A., Bowler, B. P., Horner, Jonti, Kane, S. R., Kielkopf, J., Plavchan, P., Zhang, H., Fairnington, T., Okumura, J., Mengel, M. W. 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 |
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 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 |
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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