TOI-969 : a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter,
(2023) In Astronomy and Astrophysics 669.- 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.... (More)
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.
(Less)
- author
- publishing date
- 2023-01-01
- type
- Contribution to journal
- publication status
- published
- keywords
- planets and satellites: composition, planets and satellites: detection, planets and satellites: fundamental parameters, stars: individual: TOI-969, techniques: photometric, techniques: radial velocities
- in
- Astronomy and Astrophysics
- volume
- 669
- article number
- A109
- publisher
- EDP Sciences
- external identifiers
-
- scopus:85147141597
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/202243879
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © The Authors 2023.
- id
- 14c5b291-9ec3-41c3-98e8-d1ed350e6fa7
- date added to LUP
- 2023-02-20 17:57:23
- date last changed
- 2023-02-27 12:59:37
@article{14c5b291-9ec3-41c3-98e8-d1ed350e6fa7,
abstract = {{<p>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 (P<sub>b</sub> ∼ 1.82 days) mini-Neptune planet (Formula Presented), placing it on the lower boundary of the hot-Neptune desert (T<sub>eq,b</sub> = 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.</p>}},
author = {{Lillo-Box, J. and Gandolfi, D. and Armstrong, D. J. and Collins, K. A. and Nielsen, L. D. and Luque, R. and Korth, J. and Sousa, S. G. and Quinn, S. N. and Acuña, L. and Howell, S. B. and Morello, G. and Hellier, C. and Giacalone, S. and Hoyer, S. and Stassun, K. and Palle, E. and Aguichine, A. and Mousis, O. and Adibekyan, V. and Silva, T. Azevedo and Barrado, D. and Deleuil, M. and Eastman, J. D. and Fukui, A. and Hawthorn, F. and Irwin, J. M. and Jenkins, J. M. and Latham, D. W. and Muresan, A. and Narita, N. and Persson, C. M. and Santerne, A. and Santos, N. C. and Savel, A. B. and Osborn, H. P. and Teske, J. and Wheatley, P. J. and Winn, J. N. and Barros, S. C.C. and Butler, R. P. and Caldwell, D. A. and Charbonneau, D. and Cloutier, R. and Crane, J. D. and Demangeon, O. D.S. and Díaz, R. F. and Dumusque, X. and Esposito, M. and Falk, B. and Gill, H. and Hojjatpanah, S. and Kreidberg, L. and Mireles, I. and Osborn, A. and Ricker, G. R. and Rodriguez, J. E. and Schwarz, R. P. and Seager, S. and Bell, J. Serrano and Shectman, S. A. and Shporer, A. and Vezie, M. and Wang, S. X. and Zhou, G.}},
issn = {{0004-6361}},
keywords = {{planets and satellites: composition; planets and satellites: detection; planets and satellites: fundamental parameters; stars: individual: TOI-969; techniques: photometric; techniques: radial velocities}},
language = {{eng}},
month = {{01}},
publisher = {{EDP Sciences}},
series = {{Astronomy and Astrophysics}},
title = {{TOI-969 : a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter<sup>,</sup>}},
url = {{http://dx.doi.org/10.1051/0004-6361/202243879}},
doi = {{10.1051/0004-6361/202243879}},
volume = {{669}},
year = {{2023}},
}