TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
Article
Lillo-Box, J., Gandolfi, D., Armstrong, D., Collins, K., Nielsen, L., Luque, R., Korth, J., Sousa, S., Quinn, S., Acuna, L. and Zhou, G.. 2023. "TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter." Astronomy and Astrophysics: a European journal. 669. https://doi.org/10.1051/0004-6361/202243879
| Article Title | TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter |
|---|---|
| ERA Journal ID | 1050 |
| Article Category | Article |
| Authors | Lillo-Box, J., Gandolfi, D., Armstrong, D., Collins, K., Nielsen, L., Luque, R., Korth, J., Sousa, S., Quinn, S., Acuna, L. and Zhou, G. |
| Journal Title | Astronomy and Astrophysics: a European journal |
| Journal Citation | 669 |
| Year | 2023 |
| Publisher | EDP Sciences |
| Place of Publication | France |
| ISSN | 0004-6361 |
| 1432-0746 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202243879 |
| Web Address (URL) | https://www.aanda.org/articles/aa/abs/2023/01/aa43879-22/aa43879-22.html |
| Abstract | Context. The current architecture of a given multi-planetary system is a key fingerprint of its past formation and dynamical evolution history. Long-term follow-up observations are key to complete their picture. Aims. In this paper, we focus on the confirmation and characterization of the components of the TOI-969 planetary system, where TESS detected a Neptune-size planet candidate in a very close-in orbit around a late K-dwarf star. Methods. We use a set of precise radial velocity observations from HARPS, PFS, and CORALIE instruments covering more than two years in combination with the TESS photometric light curve and other ground-based follow-up observations to confirm and characterize the components of this planetary system. Results. We find that TOI-969 b is a transiting close-in (Pb ? 1.82 days) mini-Neptune planet (Formula Presented), placing it on the lower boundary of the hot-Neptune desert (Teq,b = 941 ± 31 K). The analysis of its internal structure shows that TOI-969 b is a volatile-rich planet, suggesting it underwent an inward migration. The radial velocity model also favors the presence of a second massive body in the system, TOI-969 c, with a long period of (Formula Presented) days, a minimum mass of (Formula Presented), and a highly eccentric orbit of (Formula Presented). Conclusions. The TOI-969 planetary system is one of the few around K-dwarfs known to have this extended configuration going from a very close-in planet to a wide-separation gaseous giant. TOI-969 b has a transmission spectroscopy metric of 93 and orbits a moderately bright (G = 11.3 mag) star, making it an excellent target for atmospheric studies. The architecture of this planetary system can also provide valuable information about migration and formation of planetary systems. © The Authors 2023. |
| Keywords | planets and satellites: composition; planets and satellites: detection; planets and satellites: fundamental parameters; techniques: radial velocities; techniques: photometric; stars: individual: TOI-969 |
| ANZSRC Field of Research 2020 | 510199. Astronomical sciences not elsewhere classified |
| Byline Affiliations | Astrobiology Center, Spain |
| Polytechnic University of Turin, Italy | |
| University of Warwick, United Kingdom | |
| Center for Astrophysics Harvard and Smithsonian, United States | |
| European Southern Observatory (ESO), Germany | |
| University of Geneva, Switzerland | |
| Institute of Astrophysics of Andalusia, Spain | |
| Chalmers University of Technology, Sweden | |
| University of Porto, Portugal | |
| Aix-Marseille University, France |
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https://research.usq.edu.au/item/z2635/toi-969-a-late-k-dwarf-with-a-hot-mini-neptune-in-the-desert-and-an-eccentric-cold-jupiter
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