Precise transit and radial-velocity characterization of a resonant pair : The warm Jupiter TOI-216c and eccentric warm Neptune TOI-216b
(2021) In Astronomical Journal 161(4).- Abstract
TOI-216 hosts a pair of warm, large exoplanets discovered by the TESS mission. These planets were found to be in or near the 2:1 resonance, and both of them exhibit transit timing variations (TTVs). Precise characterization of the planets’ masses and radii, orbital properties, and resonant behavior can test theories for the origins of planets orbiting close to their stars. Previous characterization of the system using the first six sectors of TESS data suffered from a degeneracy between planet mass and orbital eccentricity. Radial-velocity measurements using HARPS, FEROS, and the Planet Finder Spectrograph break that degeneracy, and an expanded TTV baseline from TESS and an ongoing ground-based transit observing campaign increase the... (More)
TOI-216 hosts a pair of warm, large exoplanets discovered by the TESS mission. These planets were found to be in or near the 2:1 resonance, and both of them exhibit transit timing variations (TTVs). Precise characterization of the planets’ masses and radii, orbital properties, and resonant behavior can test theories for the origins of planets orbiting close to their stars. Previous characterization of the system using the first six sectors of TESS data suffered from a degeneracy between planet mass and orbital eccentricity. Radial-velocity measurements using HARPS, FEROS, and the Planet Finder Spectrograph break that degeneracy, and an expanded TTV baseline from TESS and an ongoing ground-based transit observing campaign increase the precision of the mass and eccentricity measurements. We determine that TOI-216c is a warm Jupiter, TOI-216b is an eccentric warm Neptune, and that they librate in 2:1 resonance with a moderate libration amplitude of 60-+22 deg, a small but significant free eccentricity of 0.0222-+0.00030.0005 for TOI-216b, and a small but significant mutual inclination of 1°.2–3°.9 (95% confidence interval). The libration amplitude, free eccentricity, and mutual inclination imply a disturbance of TOI-216b before or after resonance capture, perhaps by an undetected third planet.
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- author
- publishing date
- 2021-04-01
- type
- Contribution to journal
- publication status
- published
- in
- Astronomical Journal
- volume
- 161
- issue
- 4
- article number
- abd8d0
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85102415929
- ISSN
- 0004-6256
- DOI
- 10.3847/1538-3881/abd8d0
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2021. The American Astronomical Society. All rights reserved.
- id
- d646bd1e-625b-4dbc-8aa1-deb772e451be
- date added to LUP
- 2023-02-01 10:29:34
- date last changed
- 2023-02-18 17:13:21
@article{d646bd1e-625b-4dbc-8aa1-deb772e451be,
abstract = {{<p>TOI-216 hosts a pair of warm, large exoplanets discovered by the TESS mission. These planets were found to be in or near the 2:1 resonance, and both of them exhibit transit timing variations (TTVs). Precise characterization of the planets’ masses and radii, orbital properties, and resonant behavior can test theories for the origins of planets orbiting close to their stars. Previous characterization of the system using the first six sectors of TESS data suffered from a degeneracy between planet mass and orbital eccentricity. Radial-velocity measurements using HARPS, FEROS, and the Planet Finder Spectrograph break that degeneracy, and an expanded TTV baseline from TESS and an ongoing ground-based transit observing campaign increase the precision of the mass and eccentricity measurements. We determine that TOI-216c is a warm Jupiter, TOI-216b is an eccentric warm Neptune, and that they librate in 2:1 resonance with a moderate libration amplitude of 60<sub>-</sub><sup>+</sup><sub>2</sub><sup>2</sup> deg, a small but significant free eccentricity of 0.0222<sub>-</sub><sup>+</sup><sub>0.0003</sub><sup>0.0005</sup> for TOI-216b, and a small but significant mutual inclination of 1°.2–3°.9 (95% confidence interval). The libration amplitude, free eccentricity, and mutual inclination imply a disturbance of TOI-216b before or after resonance capture, perhaps by an undetected third planet.</p>}},
author = {{Dawson, Rebekah I. and Huang, Chelsea X. and Brahm, Rafael and Collins, Karen A. and Hobson, Melissa J. and Jordán, Andrés and Dong, Jiayin and Korth, Judith and Trifonov, Trifon and Abe, Lyu and Agabi, Abdelkrim and Bruni, Ivan and Paul Butler, R. and Barbieri, Mauro and Collins, Kevin I. and Conti, Dennis M. and Crane, Jeffrey D. and Crouzet, Nicolas and Dransfield, Georgina and Evans, Phil and Espinoza, Néstor and Gan, Tianjun and Guillot, Tristan and Henning, Thomas and Lissauer, Jack J. and Jensen, Eric L.N. and Sainte, Wenceslas Marie and Mékarnia, Djamel and Myers, Gordon and Nandakumar, Sangeetha and Relles, Howard M. and Sarkis, Paula and Torres, Pascal and Shectman, Stephen and Schmider, François Xavier and Shporer, Avi and Stockdale, Chris and Teske, Johanna and Triaud, Amaury H.M.J. and Wang, Sharon Xuesong and Ziegler, Carl and Ricker, G. and Vanderspek, R. and Latham, David W. and Seager, S. and Winn, J. and Jenkins, Jon M. and Bouma, L. G. and Burt, Jennifer A. and Charbonneau, David and Levine, Alan M. and McDermott, Scott and McLean, Brian and Rose, Mark E. and Vanderburg, Andrew and Wohler, Bill}},
issn = {{0004-6256}},
language = {{eng}},
month = {{04}},
number = {{4}},
publisher = {{IOP Publishing}},
series = {{Astronomical Journal}},
title = {{Precise transit and radial-velocity characterization of a resonant pair : The warm Jupiter TOI-216c and eccentric warm Neptune TOI-216b}},
url = {{http://dx.doi.org/10.3847/1538-3881/abd8d0}},
doi = {{10.3847/1538-3881/abd8d0}},
volume = {{161}},
year = {{2021}},
}