RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600
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| Formato: | Preprint |
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2026
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| author | Hu, Tong Lin, Zitao Wang, Sharon X. Wang, Mu-Tian Mireles, Ismael Bean, Jacob Brady, Madison Brown, Nina Feng, Qikang Gan, Tianjun Ji, Chengyang Li, Xue Zhang, Jiayue Basant, Ritvik Chazov, Nikita Charbonneau, David Collins, Karen A. Das, Tanya Dragomir, Diana Essack, Zahra Garcia-Mejia, Juliana Huang, Yang Liu, Jinzhong Mann, Christopher R. Osborn, Hugh P. Scholz, Aleks Seifahrt, Andreas Tamburo, Patrick Wang, Shuming Yaqup, Shahidin |
| author_facet | Hu, Tong Lin, Zitao Wang, Sharon X. Wang, Mu-Tian Mireles, Ismael Bean, Jacob Brady, Madison Brown, Nina Feng, Qikang Gan, Tianjun Ji, Chengyang Li, Xue Zhang, Jiayue Basant, Ritvik Chazov, Nikita Charbonneau, David Collins, Karen A. Das, Tanya Dragomir, Diana Essack, Zahra Garcia-Mejia, Juliana Huang, Yang Liu, Jinzhong Mann, Christopher R. Osborn, Hugh P. Scholz, Aleks Seifahrt, Andreas Tamburo, Patrick Wang, Shuming Yaqup, Shahidin |
| contents | 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 ($\rm P_b=82.7$ days, $\rm P_c=482.8$ 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 $M_p = 74.7^{+4.7}_{-4.4}\,M_{\oplus}$ and an eccentricity of $e=0.153^{+0.020}_{-0.018}$, and $M_p = 212.53^{+13.26}_{-13.03}\,M_{\oplus}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26426 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600 Hu, Tong Lin, Zitao Wang, Sharon X. Wang, Mu-Tian Mireles, Ismael Bean, Jacob Brady, Madison Brown, Nina Feng, Qikang Gan, Tianjun Ji, Chengyang Li, Xue Zhang, Jiayue Basant, Ritvik Chazov, Nikita Charbonneau, David Collins, Karen A. Das, Tanya Dragomir, Diana Essack, Zahra Garcia-Mejia, Juliana Huang, Yang Liu, Jinzhong Mann, Christopher R. Osborn, Hugh P. Scholz, Aleks Seifahrt, Andreas Tamburo, Patrick Wang, Shuming Yaqup, Shahidin Earth and Planetary Astrophysics 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 ($\rm P_b=82.7$ days, $\rm P_c=482.8$ 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 $M_p = 74.7^{+4.7}_{-4.4}\,M_{\oplus}$ and an eccentricity of $e=0.153^{+0.020}_{-0.018}$, and $M_p = 212.53^{+13.26}_{-13.03}\,M_{\oplus}$ 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. |
| title | RV and TTV Measurements of Two Transiting Long-Period Giants around TOI-4600 |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2604.26426 |