HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
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| Format: | Preprint |
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2025
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| author | Jones, Nathalie K. Wang, Jason J. Nielsen, Eric L. De Rosa, Robert J. Peck, Anne E. Roberson, William Ruffio, Jean-Baptiste Xuan, Jerry W. Macintosh, Bruce A. Ammons, S. Mark Bailey, Vanessa P. Barman, Travis S. Bulger, Joanna Chiang, Eugene Chilcote, Jeffrey K. Duchêne, Gaspard Esposito, Thomas M. Fitzgerald, Michael P. Follette, Katherine B. Goodsell, Stephen Graham, James R. Greenbaum, Alexandra Z. Hibon, Pascale Ingraham, Patrick Kalas, Paul Konopacky, Quinn M. Liu, Michael C. Marchis, Franck Maire, Jérôme Marois, Christian Matthews, Brenda Mawet, Dimitri Metchev, Stanimir Millar-Blanchaer, Maxwell A. Oppenheimer, Rebecca Palmer, David W. Patience, Jenny Perrin, Marshall D. Poyneer, Lisa Pueyo, Laurent Rajan, Abhijith Rameau, Julian Rantakyrö, Fredrik T. Ren, Bin Sanghi, Aniket Savransky, Dmitry Schneider, Adam C. Sivaramakrishnan, Anand Smith, Adam J. R. W. Song, Inseok Sommer, Remi Thomas, Sandrine Ward-Duong, Kimberly Wolff, Schuyler G. |
| author_facet | Jones, Nathalie K. Wang, Jason J. Nielsen, Eric L. De Rosa, Robert J. Peck, Anne E. Roberson, William Ruffio, Jean-Baptiste Xuan, Jerry W. Macintosh, Bruce A. Ammons, S. Mark Bailey, Vanessa P. Barman, Travis S. Bulger, Joanna Chiang, Eugene Chilcote, Jeffrey K. Duchêne, Gaspard Esposito, Thomas M. Fitzgerald, Michael P. Follette, Katherine B. Goodsell, Stephen Graham, James R. Greenbaum, Alexandra Z. Hibon, Pascale Ingraham, Patrick Kalas, Paul Konopacky, Quinn M. Liu, Michael C. Marchis, Franck Maire, Jérôme Marois, Christian Matthews, Brenda Mawet, Dimitri Metchev, Stanimir Millar-Blanchaer, Maxwell A. Oppenheimer, Rebecca Palmer, David W. Patience, Jenny Perrin, Marshall D. Poyneer, Lisa Pueyo, Laurent Rajan, Abhijith Rameau, Julian Rantakyrö, Fredrik T. Ren, Bin Sanghi, Aniket Savransky, Dmitry Schneider, Adam C. Sivaramakrishnan, Anand Smith, Adam J. R. W. Song, Inseok Sommer, Remi Thomas, Sandrine Ward-Duong, Kimberly Wolff, Schuyler G. |
| contents | 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 Gemini Planet Imager Exoplanet Survey (GPIES) in 2016 and 2019 and is a member of the Sco-Cen star formation region. The exoplanet is detected $\sim 430$ 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 semi-major axis of $64 ^{+32}_{-14}$ au and eccentricity ${0.23 ^{+0.24}_{-0.16}}$. Spectral analysis of the GPI $H$-band spectrum and NIRC2 \textit{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-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 $1042^{+178}_{-132}$ K for the planet and translate the derived luminosity of the planet to a mass of $5.6 \pm 1.1~M_\textrm{Jup}$ assuming hot-start evolutionary models. HD 143811 AB b is the first directly imaged planet around a binary that is not on an ultra-wide orbit. Future characterization of this object will shed light on the formation of planets around binary star systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_06729 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen Jones, Nathalie K. Wang, Jason J. Nielsen, Eric L. De Rosa, Robert J. Peck, Anne E. Roberson, William Ruffio, Jean-Baptiste Xuan, Jerry W. Macintosh, Bruce A. Ammons, S. Mark Bailey, Vanessa P. Barman, Travis S. Bulger, Joanna Chiang, Eugene Chilcote, Jeffrey K. Duchêne, Gaspard Esposito, Thomas M. Fitzgerald, Michael P. Follette, Katherine B. Goodsell, Stephen Graham, James R. Greenbaum, Alexandra Z. Hibon, Pascale Ingraham, Patrick Kalas, Paul Konopacky, Quinn M. Liu, Michael C. Marchis, Franck Maire, Jérôme Marois, Christian Matthews, Brenda Mawet, Dimitri Metchev, Stanimir Millar-Blanchaer, Maxwell A. Oppenheimer, Rebecca Palmer, David W. Patience, Jenny Perrin, Marshall D. Poyneer, Lisa Pueyo, Laurent Rajan, Abhijith Rameau, Julian Rantakyrö, Fredrik T. Ren, Bin Sanghi, Aniket Savransky, Dmitry Schneider, Adam C. Sivaramakrishnan, Anand Smith, Adam J. R. W. Song, Inseok Sommer, Remi Thomas, Sandrine Ward-Duong, Kimberly Wolff, Schuyler G. Earth and Planetary Astrophysics Solar and Stellar Astrophysics 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 Gemini Planet Imager Exoplanet Survey (GPIES) in 2016 and 2019 and is a member of the Sco-Cen star formation region. The exoplanet is detected $\sim 430$ 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 semi-major axis of $64 ^{+32}_{-14}$ au and eccentricity ${0.23 ^{+0.24}_{-0.16}}$. Spectral analysis of the GPI $H$-band spectrum and NIRC2 \textit{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-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 $1042^{+178}_{-132}$ K for the planet and translate the derived luminosity of the planet to a mass of $5.6 \pm 1.1~M_\textrm{Jup}$ assuming hot-start evolutionary models. HD 143811 AB b is the first directly imaged planet around a binary that is not on an ultra-wide orbit. Future characterization of this object will shed light on the formation of planets around binary star systems. |
| title | HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2509.06729 |