RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600

arXiv:2604.26426 · astro-ph.EP · Submitted 2026-04-29 · Read on arXiv

Tong Hu, Zitao Lin, Sharon X. Wang, Mu-Tian Wang, Ismael Mireles, Jacob Bean, Madison Brady, Nina Brown, Qikang Feng, Tianjun Gan, Chengyang Ji, Xue Li, Jiayue Zhang, Ritvik Basant, Nikita Chazov, David Charbonneau, Karen A. Collins, Tanya Das, Diana Dragomir, Zahra Essack, Juliana Garcia-Mejia, Yang Huang, Jinzhong Liu, Christopher R. Mann, Hugh P. Osborn, Aleks Scholz, Andreas Seifahrt, Patrick Tamburo, Shuming Wang, Shahidin Yaqup

astro-ph.EP

Submitted: 2026-04-29

Comments: Submitted to AJ, 23 pages, 6 figures, 7 tables

Code: https://github.com/Jiayue-Zhang99/SEDEX

License: http://creativecommons.org/licenses/by/4.0/

The gist: TOI-4600b and c, originally identified by the Transiting Exoplanet Survey Satellite (TESS) and reported by I.

Terminology

Aperture — 6× in this paper · explained in 1 episode
Aperture Photometry — 3× in this paper · explained in 1 episode
Benchmark — 3× in this paper · explained in 2 episodes
Metallicity — 3× in this paper · explained in 3 episodes
Transiting Exoplanet Survey Satellite — 2× in this paper
Abundance — 1× in this paper · explained in 1 episode
Alignment — 1× in this paper · explained in 1 episode
Bayesian Inference — 1× in this paper · explained in 5 episodes
Calibration — 1× in this paper · explained in 7 episodes
Consistency — 1× in this paper · explained in 3 episodes
Core — 1× in this paper · explained in 2 episodes
Gaussian Process — 1× in this paper
James Gregory Telescope — 1× in this paper
Mikulski Archive for Space Telescopes — 1× in this paper
Mount Wilson Observatory — 1× in this paper
Observational Selection Effects — 1× in this paper · explained in 2 episodes
Principal Component Analysis (PCA) — 1× in this paper · explained in 4 episodes
Signal-to-noise ratio (SNR) — 1× in this paper · explained in 2 episodes
Society of Photo-Optical Instrumentation Engineers — 1× in this paper
TOI-4600 with the Tillinghast Reflector Echelle Spectrograph — 1× in this paper
Trace — 1× in this paper · explained in 2 episodes
Transmission Spectroscopy Metric — 1× in this paper
Transmission spectroscopy — 1× in this paper · explained in 2 episodes

Abstract

TOI-4600b and c, originally identified by the Transiting Exoplanet Survey Satellite (TESS) and reported by I. Mireles et al. (2023), are a rare pair of transiting long-period giant planets (P b=82.7 days, P c=482.8 days) orbiting an early K dwarf. In this work, we refine the orbital parameters of the TOI-4600 system by combining new TESS photometry, ground-based transit follow-up, and radial velocity (RV) observations from MAROON-X. We obtain improved constraints on planetary masses and eccentricities, and update other parameters, such as the stellar age. For TOI-4600b, we measure a mass of M p = 74.7+4.7-4.4,M and an eccentricity of e=0.153+0.020-0.018, and M p = 212.53+13.26-13.03,M and e=0.219+0.015-0.018 for TOI-4600c. We find significant transit timing variations (TTV) in both planets, with semi-amplitudes of approximately 1,hr. We derive Transit Spectroscopy Metric values of 16.87 for TOI-4600b and 10.09 for TOI-4600c, indicating that both planets are promising JWST targets for studying the atmospheres of temperate and cold Jupiters, a relatively poorly characterized sample thus far. These updated parameters and TTV ephemerides are important for planning and interpreting future photometric, spectroscopic, and dynamical studies of the TOI-4600 system.

RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600

Terminology

Abstract

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