A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS
Abstract
We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space mission. Ground-based photometric and spectroscopic follow-up from different facilities, confirmed the substellar nature of TIC 4672985 b, a massive gas giant in the transition between the super-Jupiters and brown dwarfs mass regime. From the joint analysis we derived the following orbital parameters: P = 69.0480₋₀.₀₀₀₅⁺⁰.⁰⁰⁰⁴ d, Mₚ = 12.74₋₁.₀₁⁺¹.⁰¹ Mⱼ, Rₚ = 1.026₋₀.₀₆₇⁺⁰.⁰⁶⁵ Rⱼ and e = 0.018₋₀.₀₀₄⁺⁰.⁰⁰⁴. In addition, the RV time series revealed a significant trend at the ~350 m s−1 yr−1 level, which is indicative of the presence of a massive outer companion in the system. TIC 4672985 b is a unique example of a transiting substellar companion with a mass above the deuterium-burning limit, located beyond 0.1 AU and in a nearly circular orbit. These planetary properties are difficult to reproduce from canonical planet formation and evolution models. For TOI-2529 b, we obtained the following orbital parameters: P = 64.5949₋₀.₀₀₀₃⁺⁰.⁰⁰⁰³ d, Mₚ = 2.340₋₀.₁₉₅⁺⁰.¹⁹⁷ Mⱼ, Rₚ = 1.030₋₀.₀₅₀⁺⁰.⁰⁵⁰ Rⱼ and e = 0.021₋₀.₀₁₅⁺⁰.⁰²⁴, making this object a new example of a growing population of transiting warm giant planets. Show more
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https://doi.org/10.3929/ethz-b-000666920Publication status
publishedExternal links
Journal / series
Astronomy & AstrophysicsVolume
Pages / Article No.
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EDP SciencesSubject
techniques: photometric; techniques: radial velocities; planets and satellites: composition; planets and satellites: detection; planets and satellites: formation; planets and satellites: gaseous planetsFunding
182901 - NCCR PlanetS – Funding of Equipment for the LIFE project (SNF)
205606 - NCCR PlanetS – Funding of Future Flagship proto-LIFE for Phase III (SNF)
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