TOI-6692 b: An Eccentric 130 Day Period Giant Planet with a Single Transit from TESS

Abstract 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.

Authors

Institutions

Publication Details

Journal
The Astronomical Journal
Published
2026-03-03
DOI
https://doi.org/10.3847/1538-3881/ae3d9f
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
0.00

Funders

Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

TOI-6692 b: An Eccentric 130 Day Period Giant Planet with a Single Transit from TESS

Martti H. Kristiansen, D. A. Caldwell, Léna Parc, Michelle Kunimoto et al.
The Astronomical Journal
Stellar, planetary, and galactic studies
article

TOI-6692 b: An Eccentric 130 Day Period Giant Planet with a Single Transit from TESS

Martti H. Kristiansen, D. A. Caldwell, Léna Parc, Michelle Kunimoto, Soléne Ulmer-Moll, Daryll M. LaCourse, Abderahmane Soubkiou, Thomas L. Jacobs, Johanna Teske, Eric L. N. Jensen, G. Srdoc, J. D. Crane, Jason D. Eastman, Joseph E. Rodriguez, Sarah J. Deveny, Trifon Trifonov, Yadira Gaibor, S. X. Wang, Keith Horne, Cristilyn N. Watkins, Jhon Yana Galarza, Rafael Brahm, Malena Rice, George Zhou, Ramotholo Sefako, Paul Dalba, Khalid Barkaoui, Avi Shporer, Marcelo Tala Pinto, Michal Steiner, R. Paul Butler, Stephen A. Shectman, Brad Carter, Allyson Bieryla, Emmanuel Jehin, Michaël Gillon, David W. Latham, Karen A. Collins, Samuel W. Yee, Tansu Daylan, Thomas Henning, Richard P. Schwarz, Samuel N. Quinn, H.M. Schwengeler, Mark Omohundro, Steve B. Howell, Andrés Jordán
article en

Abstract

Abstract 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.

The Astronomical JournalVol. 171(4)
University of Geneva (CH), Swarthmore College (US), Leiden University (NL), Ames Research Center (US), Planetary Science Institute (US), University of British Columbia (CA), University of Liège (BE), University of St Andrews (GB), University of Concepción (CL), University of California, Santa Cruz (US), University of Southern Queensland (AU), Carnegie Institution for Science (US), Adolfo Ibáñez University (CL), Heidelberg University (DE), Montana State University (US), Yale University (US), University of Oxford (GB), Millennium Institute of Astrophysics (CL), Max Planck Institute for Astronomy (DE), Bay Area Environmental Research Institute (US), South African Radio Astronomy Observatory (ZA), Center for Astrophysics Harvard & Smithsonian (US), Carnegie Observatories (US), Instituto de Astrofísica de Canarias (ES), Astronomical Institute of the Slovak Academy of Sciences (SK), The Ohio State University (US), Sofia University "St. Kliment Ohridski" (BG), Massachusetts Institute of Technology (US), Michigan State University (US), Search for Extraterrestrial Intelligence (US), Tsinghua University (CN)
National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Washington University in St. Louis, European Space Agency, Flatiron Health, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Fonds De La Recherche Scientifique - FNRS, Ministry of Science, ICT and Future Planning, Korea Astronomy and Space Science Institute, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Agencia Nacional de Investigación y Desarrollo, Ames Research Center, Science Mission Directorate, Natural Sciences and Engineering Research Council of Canada
Openalex Percentile: Top 37%
Stellar, planetary, and galactic studies
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.