| Title: |
TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS* |
| Authors: |
Trifonov, T; Brahm, R; Jordan, A; Hartogh, C; Henning, T; Hobson, MJ; Schlecker, M; Howard, S; Reichardt, F; Espinoza, N; Lee, MH; Nesvorny, D; Rojas, FI; Barkaoui, K; Kossakowski, D; Boyle, G; Dreizler, S; Kurster, M; Heller, R; Guillot, T; Triaud, AHMJ; Abe, L; Agabi, A; Bendjoya, P; Crouzet, N; Dransfield, G; Gasparetto, T; Gunther, MN; Marie-Sainte, W; Mekarnia, D; Suarez, O; Teske, J; Butler, RP; Crane, JD; Shectman, S; Ricker, GR; Shporer, A; Vanderspek, R; Jenkins, JM; Wohler, B; Collins, KA; Collins, KI; Ciardi, DR; Barclay, T; Mireles, I; Seager, S; Winn, JN |
| Publisher Information: |
IOP Publishing |
| Publication Year: |
2023 |
| Collection: |
University of Hong Kong: HKU Scholars Hub |
| Description: |
The K-type star TOI-2525 has an estimated mass of M = M ⊙ and radius of R = R ⊙ observed by the TESS mission in 22 sectors (within sectors 1 and 39). The TESS light curves yield significant transit events of two companions, which show strong transit timing variations (TTVs) with a semiamplitude of ∼6 hr. We performed TTV dynamical and photodynamical light-curve analysis of the TESS data combined with radial velocity measurements from FEROS and PFS, and we confirmed the planetary nature of these companions. The TOI-2525 system consists of a transiting pair of planets comparable to Neptune and Jupiter with estimated dynamical masses of m b = and m c = M Jup , radii of r b = and r c = R Jup , and orbital periods of P b = and P c = days for the inner and outer planet, respectively. The period ratio is close to the 2:1 period commensurability, but the dynamical simulations of the system suggest that it is outside the mean-motion resonance (MMR) dynamical configuration. Object TOI-2525 b is among the lowest-density Neptune-mass planets known to date, with an estimated median density of ρ b = g cm −3 . The TOI-2525 system is very similar to the other K dwarf systems discovered by TESS, TOI-2202 and TOI-216, which are composed of almost identical K dwarf primaries and two warm giant planets near the 2:1 MMR. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
Astronomical Journal; 23; WOS:000960020200001; https://hub.hku.hk/handle/10722/332234; 165 |
| DOI: |
10.3847/1538-3881/acba9b |
| Availability: |
https://hub.hku.hk/handle/10722/332234; https://doi.org/10.3847/1538-3881/acba9b |
| Rights: |
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. |
| Accession Number: |
edsbas.CA1B4E2A |
| Database: |
BASE |