December
2025
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2025ApJ...995L..41J
Authors
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Jones, Nathalie K.
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Wang, Jason J.
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Nielsen, Eric L.
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De Rosa, Robert J.
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Peck, Anne E.
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Roberson, William
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Ruffio, Jean-Baptiste
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Xuan, Jerry W.
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Macintosh, Bruce A.
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Ammons, S. Mark
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Bailey, Vanessa P.
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Barman, Travis S.
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Bulger, Joanna
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Chiang, Eugene
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Chilcote, Jeffrey K.
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Duchêne, Gaspard
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Esposito, Thomas M.
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Fitzgerald, Michael P.
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Follette, Katherine B.
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Goodsell, Stephen
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Graham, James R.
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Greenbaum, Alexandra Z.
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Hibon, Pascale
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Ingraham, Patrick
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Kalas, Paul
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Konopacky, Quinn M.
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Liu, Michael C.
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Marchis, Franck
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Maire, Jérôme
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Marois, Christian
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Matthews, Brenda
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Mawet, Dimitri
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Metchev, Stanimir
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Millar-Blanchaer, Maxwell A.
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Oppenheimer, Rebecca
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Palmer, David W.
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Patience, Jenny
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Perrin, Marshall D.
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Poyneer, Lisa
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Pueyo, Laurent
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Rajan, Abhijith
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Rameau, Julien
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Rantakyrö, Fredrik T.
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Ren, Bin
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Sanghi, Aniket
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Savransky, Dmitry
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Schneider, Adam C.
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Sivaramakrishnan, Anand
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Smith, Adam J. R. W.
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Song, Inseok
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Soummer, Remi
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Thomas, Sandrine
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Ward-Duong, Kimberly
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Wolff, Schuyler G.
Abstract
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We present confirmation of HD 143811 AB b, a substellar companion to spectroscopic binary HD 143811 AB through direct imaging with the Gemini Planet Imager (GPI) and Keck NIRC2. HD 143811 AB was observed as a part of the GPI Exoplanet Survey in 2016 and 2019 and is a member of the Sco-Cen star formation region. The exoplanet is detected ∼430 mas from the host star by GPI. With two GPI epochs and one from Keck/NIRC2 in 2022, we confirm through common proper motion analysis that the object is bound to its host star. We derive an orbit with a semimajor axis of 64−14+32 au and eccentricity 0.23−0.16+0.24 . Spectral analysis of the GPI H-band spectrum and NIRC2 L' photometry provides additional proof that this object is a substellar companion. We compare the spectrum of HD 143811 AB b to PHOENIX stellar models and Exo-Radioactive-Convective Equilibrium Model (REM) exoplanet atmosphere models and find that Exo-REM models provide the best fits to the data. From the Exo-REM models, we derive an effective temperature of 1042−132+178 K for the planet and translate the derived luminosity of the planet to a mass of 5.6 ± 1.1 MJup assuming hot-start evolutionary models. HD 143811 AB b is the first directly imaged planet around a binary that is not on an ultrawide orbit. Future characterization of this object will shed light on the formation of planets around binary star systems.
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