A hot mini-Neptune and a temperate, highly eccentric sub-Saturn around the bright K-dwarf TOI-2134
Article
Article Title | A hot mini-Neptune and a temperate, highly eccentric sub-Saturn around the bright K-dwarf TOI-2134 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Rescigno, F., Hebrard, G., Vanderburg, A. W., Mann, A.W., Mortier, A., Morrell, S., Buchhave, L. A., Collins, K. A., Mann, C. R., Hellier, C., Haywood, R. D., West, R., Stalport, M., Heidari, N., Anderson, D., Huang, C. X., Lopez-Morales, M., Cortés-Zuleta, P., Lewis, H.M., Dumusque, X., Boisse, I., Rowden, P., Collier Cameron, A., Deleuil, M., Vezie, M., Pepe, F. A., Delfosse, X., Charbonneau, D., Rice, K., Demangeon, O., Quinn, S. N., Udry, S., Forveille, T., Winn, J., Sozzetti, A., Hoyer, S., Seager, S., Wilson, T.G., Dalal, S., Martioli, E., Striegel, S., Boschin, W., Dragomir, D., Martinez Fiorenzano, A. F., Cosentino, R., Ghedina, A., Malavolta, L., Affer, L., Lakeland, B. S., Nicholson, B. A., Foschino, S., Wünsche, A., Barkaoui, K., Srdoc, G., Randolph, J., Guillet, B., Conti, D. M., Ghachoui, M., Gillon, M., Benkhaldoun, Z., Pozuelos, F., Timmermans, M., Girardin, E., Matutano, S., Bosch-Cabot, P., Munoz, J. and Fores-Toribio, R. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 527, pp. 5385-5407 |
Number of Pages | 23 |
Year | 2024 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stad3255 |
Web Address (URL) | https://academic.oup.com/mnras/article/527/3/5385/7330172 |
Abstract | We present the characterization of an inner mini-Neptune in a 9.2292005 ± 0.0000063 d orbit and an outer mono-transiting sub-Saturn planet in a 95.50+0.36 −0.25 d orbit around the moderately active, bright (mv = 8.9 mag) K5V star TOI-2134. Based on our analysis of five sectors of TESS data, we determine the radii of TOI-2134b and c to be 2.69 ± 0.16 R⊕ for the inner planet and 7.27 ± 0.42 R⊕ for the outer one. We acquired 111 radial-velocity (RV) spectra with HARPS-N and 108 RV spectra with SOPHIE. After careful periodogram analysis, we derive masses for both planets via Gaussian Process regression: 9.13+0.78 −0.76 M⊕ for TOI-2134b and 41.89+7.69 −7.83 M⊕ for TOI-2134c. We analysed the photometric and RV data first separately, then jointly. The inner planet is a mini-Neptune with density consistent with either a water-world or a rocky core planet with a low-mass H/He envelope. The outer planet has a bulk density similar to Saturn’s. The outer planet is derived to have a significant eccentricity of 0.67+0.05 −0.06 from a combination of photometry and RVs. We compute the irradiation of TOI-2134c as 1.45 ± 0.10 times the bolometric flux received by Earth, positioning it for part of its orbit in the habitable zone of its system. We recommend further RV observations to fully constrain the orbit of TOI-2134c. With an expected Rossiter–McLaughlin (RM) effect amplitude of 7.2 ± 1.3 m s−1, we recommend TOI-2134c for follow-up RM analysis to study the spin–orbit architecture of the system. We calculate the Transmission Spectroscopy Metric, and both planets are suitable for bright-mode Near Infrared Camera (NIRCam) atmospheric characterization. |
Keywords | methods: data analysis; techniques: photometric; techniques: radial |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
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 | University of Exeter, United Kingdom |
Pierre and Marie Curie University, France | |
Aix-Marseille University, France | |
Massachusetts Institute of Technology, United States | |
University of North Carolina at Chapel Hill, United States | |
University of Birmingham, United Kingdom | |
Technical University of Denmark, Denmark | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Montreal, Canada | |
Keele University, United Kingdom | |
University of Warwick, United Kingdom | |
University of Liege, Belgium | |
University of Geneva, Switzerland | |
Centre for Astrophysics | |
University of Provence, France | |
Space Telescope Science Institute, United States | |
Royal Astronomical Society, United Kingdom | |
University of St Andrews, United Kingdom | |
Grenoble Alpes University, France | |
University of Edinburgh, United Kingdom | |
University of Porto, Portugal | |
Princeton University, United States | |
INAF - Astrophysical Observatory of Turin, Italy | |
SETI Institute, United States | |
NASA Ames Research Center, United States | |
Galileo Galilei Foundation - INAF, Spain | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of La Laguna, Spain | |
University of New Mexico, United States | |
University of Padova, Italy | |
INAF - Astronomical Observatory of Padova, Italy | |
INAF - Palermo Astronomical Observatory, Italy | |
University of Oxford, United Kingdom | |
Observatory of Baronnies Provencales, France | |
Kotizarovci Observatory, Croatia | |
American Association of Variable Star Observers, United States | |
Cadi Ayyad University, Morocco | |
Institute of Astrophysics of Andalusia, Spain | |
Grand Pra Observatory, Switzerland | |
Albanya Observatory, Spain | |
University of Valencia, Spain |
https://research.usq.edu.au/item/z5z92/a-hot-mini-neptune-and-a-temperate-highly-eccentric-sub-saturn-around-the-bright-k-dwarf-toi-2134
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