TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations
Korth, J. LU ; Mustill, A.J. LU
; Hobbs, D.
LU
and Winn, J.N.
(2024)
In Astrophysical Journal Letters
971(2).
- Abstract
- We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b (P = 4.42 days, M = 1.86 ± 0.02 M Jup, R = 2.4 ± 0.5 R Jup) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both planets and transit duration variations for the inner planet. The TTV amplitude for TOI-1408 c is 15% of the planet’s orbital period, marking the largest TTV amplitude relative to the orbital period measured to date. Photodynamical modeling of ground-based radial velocity (RV) observations and transit light curves obtained with the Transiting Exoplanet Survey Satellite and... (More)
- We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b (P = 4.42 days, M = 1.86 ± 0.02 M Jup, R = 2.4 ± 0.5 R Jup) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both planets and transit duration variations for the inner planet. The TTV amplitude for TOI-1408 c is 15% of the planet’s orbital period, marking the largest TTV amplitude relative to the orbital period measured to date. Photodynamical modeling of ground-based radial velocity (RV) observations and transit light curves obtained with the Transiting Exoplanet Survey Satellite and ground-based facilities leads to an inner planet radius of 2.22 ± 0.06 R ⊕ and mass of 7.6 ± 0.2 M ⊕ that locates the planet into the sub-Neptune regime. The proximity to the 2:1 period commensurability leads to the libration of the resonant argument of the inner planet. The RV measurements support the existence of a third body with an orbital period of several thousand days. This discovery places the system among the rare systems featuring a hot Jupiter accompanied by an inner low-mass planet. © 2024. The Author(s). Published by the American Astronomical Society. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/ee3682c5-e0a1-4d14-902e-35ab80820231
- author
- Korth, J.
LU
; Mustill, A.J.
LU
; Hobbs, D.
LU
and Winn, J.N.
- author collaboration
- organization
- publishing date
- 2024
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Astrophysical Journal Letters
- volume
- 971
- issue
- 2
- article number
- L28
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85201316198
- ISSN
- 2041-8205
- DOI
- 10.3847/2041-8213/ad65fd
- language
- English
- LU publication?
- yes
- additional info
- Number of authors = 63 EID = 85201316198 Article no = L28 Affiliation = Watanabe N., Department of Multi-Disciplinary Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902, Japan Affiliation = Winn J.N., Department of Astrophysical Sciences, Princeton University, Princeton, 08544, NJ, United States
- id
- ee3682c5-e0a1-4d14-902e-35ab80820231
- date added to LUP
- 2024-10-04 12:15:39
- date last changed
- 2025-04-04 14:49:43
@article{ee3682c5-e0a1-4d14-902e-35ab80820231,
abstract = {{We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b (P = 4.42 days, M = 1.86 ± 0.02 M Jup, R = 2.4 ± 0.5 R Jup) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both planets and transit duration variations for the inner planet. The TTV amplitude for TOI-1408 c is 15% of the planet’s orbital period, marking the largest TTV amplitude relative to the orbital period measured to date. Photodynamical modeling of ground-based radial velocity (RV) observations and transit light curves obtained with the Transiting Exoplanet Survey Satellite and ground-based facilities leads to an inner planet radius of 2.22 ± 0.06 R ⊕ and mass of 7.6 ± 0.2 M ⊕ that locates the planet into the sub-Neptune regime. The proximity to the 2:1 period commensurability leads to the libration of the resonant argument of the inner planet. The RV measurements support the existence of a third body with an orbital period of several thousand days. This discovery places the system among the rare systems featuring a hot Jupiter accompanied by an inner low-mass planet. © 2024. The Author(s). Published by the American Astronomical Society.}},
author = {{Korth, J. and Mustill, A.J. and Hobbs, D. and Winn, J.N.}},
issn = {{2041-8205}},
language = {{eng}},
number = {{2}},
publisher = {{IOP Publishing}},
series = {{Astrophysical Journal Letters}},
title = {{TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations}},
url = {{http://dx.doi.org/10.3847/2041-8213/ad65fd}},
doi = {{10.3847/2041-8213/ad65fd}},
volume = {{971}},
year = {{2024}},
}