| Title: |
TOI-6692 b: An Eccentric 130 Day Period Giant Planet with a Single Transit from TESS |
| Authors: |
Bieryla, A; Collins, KA; Zhou, G; Latham, DW; Carter, B; Dalba, P; Gagliano, R; Jacobs, TL; Kristiansen, MH; LaCourse, D; Omohundro, M; Schwengeler, H; Barkaoui, K; Brahm, R; Butler, RP; Caldwell, DA; Crane, JD; Daylan, T; Deveny, S; Eastman, JD; Gaibor, YS; Gillon, M; Henning, T; Horne, K |
| Publisher Information: |
IOP Publishing |
| Publication Year: |
2026 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
We report the discovery and characterization of TOI-6692 b, an eccentric (e ∼ 0.54) Jupiter on a 130 day orbit. TOI-6692 b was first detected as a community TESS Object of Interest by the Visual Survey Group and the Planet Hunters group as a single-transit candidate via TESS observation. The period was subsequently confirmed via radial velocity monitoring from the Planet Finder Spectrograph on the 6.5 m Magellan telescope. Additional radial velocities were acquired with the CHIRON, FEROS, and CORALIE spectrographs. LCOGT ground-based photometric follow-up was conducted over 2 weeks to detect another transit and refine the period. Although we did not detect an ingress or egress of the 11.04 hr transit, we did detect a possible in-transit signal in the multinight data and provide an updated ephemeris for future monitoring. TOI-6692 b is one of the few planets with orbital periods longer than 100 days that have a secure mass, radius, and eccentricity detection. As with most giant planets at these orbital periods, the eccentricity of TOI-6692 b is lower than that expected of planets undergoing high-eccentricity tidal migration, but is more consistent with the expectations of planet–planet scattering outcomes. A long-term radial velocity trend was detected, and further monitoring is warranted to determine the outer companion period. TOI-6692 b is also one of the few TESS single transit targets to have its periods eventually confirmed via follow-up photometric campaigns timed to capture transits despite the relatively large ephemeris uncertainties. Such efforts highlight the capabilities of night-to-night stability on ground-based photometric facilities today. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.3847/1538-3881/ae3d9f |
| Availability: |
https://doi.org/10.3847/1538-3881/ae3d9f; https://ora.ox.ac.uk/objects/uuid:e3735106-5259-47bd-84fd-e8cc1f1e4322 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.84001682 |
| Database: |
BASE |