July
2025
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2025AJ....170...41E
Authors
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Essack, Zahra
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Dragomir, Diana
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Dalba, Paul A.
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Battley, Matthew P.
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Ciardi, David R.
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Collins, Karen A.
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Howell, Steve B.
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Jones, Matias I.
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Kane, Stephen R.
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Mamajek, Eric E.
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Mann, Christopher R.
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Mireles, Ismael
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Oddo, Dominic
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Sgro, Lauren A.
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Stassun, Keivan G.
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Ulmer-Moll, Solene
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Watkins, Cristilyn N.
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Yee, Samuel W.
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Ziegler, Carl
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Bieryla, Allyson
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Apergis, Ioannis
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Barkaoui, Khalid
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Brahm, Rafael
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Bryant, Edward M.
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Esposito, Thomas M.
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Figueira, Pedro
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Fulton, Benjamin J.
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Gill, Samuel
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Howard, Andrew W.
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Isaacson, Howard
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Kendall, Alicia
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Law, Nicholas
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Lund, Michael B.
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Mann, Andrew W.
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Matson, Rachel A.
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Murgas, Felipe
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Palle, Enric
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Quinn, Samuel N.
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Revol, Alexandre
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Saha, Suman
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Schwarz, Richard P.
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Sefako, Ramotholo
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Shporer, Avi
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Strakhov, Ivan A.
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Villanueva, Steven
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Ricker, George R.
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Vanderspek, Roland
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Latham, David W.
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Seager, Sara
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Winn, Joshua N.
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Bosch-Cabot, Pau
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Collins, Kevin I.
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Forés-Toribio, Raquel
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Rodriguez Frustagia, Fabian
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Girardin, Eric
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Helm, Ian J.
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Lewin, Pablo
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Muñoz, Jose A.
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Newman, Patrick
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Plavchan, Peter
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Srdoc, Gregor
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Stockdale, Chris
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Wünsche, Anaël
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Billiani, Mario
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Davy, Martin
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Douvas, Alex
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Fukui, Keiichi
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Guillet, Bruno
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Ostrem, Cory
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Rushton, Michael
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Schmidt, Angsar
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Finardi, Andrea
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Girard, Patrice
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Goto, Tateki
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de Lambilly, Julien S.
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Leroux, Liouba
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Mortecrette, Fabrice
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Pickering, John W.
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Primm, Michael
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Ribot, Marc
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Teng, Ethan
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Verveen, Aad
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Will, Stefan
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Ziegler, Mark
Abstract
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We report the discovery and confirmation of TOI-4465 b, a 1.25RJ ‑0.07RJ+0.08RJ , 5.89MJ ± 0.26MJ giant planet orbiting a G dwarf star at d ≃ 122 pc. The planet was detected as a single-transit event in data from Sector 40 of the Transiting Exoplanet Survey Satellite (TESS) mission. Radial velocity (RV) observations of TOI-4465 showed a planetary signal with an orbital period of ∼102 days and an orbital eccentricity of e = 0.24 ± 0.01. TESS reobserved TOI-4465 in Sector 53 and Sector 80 but did not detect another transit of TOI-4465 b, as the planet was not expected to transit during these observations based on the RV period. A global ground-based photometry campaign was initiated to observe another transit of TOI-4465 b after the RV period determination. The ∼12 hr long transit event was captured from multiple sites around the world and included observations from 24 citizen scientists, confirming the orbital period as ∼102 days. TOI-4465 b is a relatively dense (3.73 ± 0.53 g cm‑3), temperate (375–478 K) giant planet. Based on giant planet structure models, TOI-4465 b appears to be enriched in heavy elements at a level consistent with late-stage accretion of icy planetesimals. Additionally, we explore TOI-4465 b's potential for atmospheric characterization and obliquity measurement. Increasing the number of long-period planets by confirming single-transit events is crucial for understanding the frequency and demographics of planet populations in the outer regions of planetary systems.
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