Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b
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2025
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| author | Peck, Anne E. Roberson, William Nielsen, Eric L. De Rosa, Robert J. Jones, Nathalie Wang, Jason Macintosh, Bruce Lewis, Bailey L. Duchêne, Gaspard Metchev, Stanimir Abbas, Asif Xuan, Jerry W. Sanghi, Aniket Panience, Jennifer Barman, Travis S. Bulger, Joanna Chilcote, Jeffrey K. Esposito, Thomas M. Fitzgerald, Michael P. Follette, Katherine B. Gallamore, Hannah Goodsell, Stephen Graham, James R. Greenbaum, Alexandra Z. Hibon, Pascale Ingraham, Patrick Kalas, Paul Konopacky, Quinn M. Marchis, Franck Maire, Jérôme Marois, Christian Matthews, Brenda Mawet, Dimitri Millar-Blanchaer, Maxwell A. Oppenheimer, Rebecca Palmer, David W. Perrin, Marshall D. Pointer, Lisa Pueyo, Laurent Rajan, Abhijith Rameau, Julien Rantakyrö, Fredrik T. Ren, Bin Ruffio, Jean-Baptiste Savransky, Dmitry Schneider, Adam C. Sivaramakrishnan, Anand Smith, Adam J. R. W. Song, Inseok Summer, Remi Thomas, Sandrine Ward-Duong, Kimberly Wolff, Schuyler G. |
| author_facet | Peck, Anne E. Roberson, William Nielsen, Eric L. De Rosa, Robert J. Jones, Nathalie Wang, Jason Macintosh, Bruce Lewis, Bailey L. Duchêne, Gaspard Metchev, Stanimir Abbas, Asif Xuan, Jerry W. Sanghi, Aniket Panience, Jennifer Barman, Travis S. Bulger, Joanna Chilcote, Jeffrey K. Esposito, Thomas M. Fitzgerald, Michael P. Follette, Katherine B. Gallamore, Hannah Goodsell, Stephen Graham, James R. Greenbaum, Alexandra Z. Hibon, Pascale Ingraham, Patrick Kalas, Paul Konopacky, Quinn M. Marchis, Franck Maire, Jérôme Marois, Christian Matthews, Brenda Mawet, Dimitri Millar-Blanchaer, Maxwell A. Oppenheimer, Rebecca Palmer, David W. Perrin, Marshall D. Pointer, Lisa Pueyo, Laurent Rajan, Abhijith Rameau, Julien Rantakyrö, Fredrik T. Ren, Bin Ruffio, Jean-Baptiste Savransky, Dmitry Schneider, Adam C. Sivaramakrishnan, Anand Smith, Adam J. R. W. Song, Inseok Summer, Remi Thomas, Sandrine Ward-Duong, Kimberly Wolff, Schuyler G. |
| contents | HD~143811~AB is the host star to the directly imaged planet HD~143811~AB~b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2. A member of the Sco-Cen star-forming region with an age of $13 \pm 4$ Myr, HD~143811~AB is somewhat rare among hosts of directly imaged planets as it is a close stellar binary, with an $\sim$18 day period. Accurate values for the orbital and stellar parameters of this binary are needed to understand the formation and evolutionary history of the planet in orbit. We utilize archival high-resolution spectroscopy from FEROS on the MPG/ESO 2.2-meter telescope to fit the orbit of the binary, and combine with unresolved photometry to derive the basic stellar properties of the system. From the orbit, we derive precise values of orbital period of $18.59098 \pm 0.00007$ days, and mass ratio of $0.885 \pm 0.003$. When combined with stellar evolutionary models, we find masses of both components of $M_A = 1.30^{+0.03}_{-0.05}$ M$_\odot$ and $M_B = 1.15^{+0.03}_{-0.04}$ M$_\odot$. While the current data are consistent with the planet and stellar orbits being coplanar, the 3D orientations of both systems are currently poorly constrained, with additional observations required to more rigorously test for coplanarity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_06727 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b Peck, Anne E. Roberson, William Nielsen, Eric L. De Rosa, Robert J. Jones, Nathalie Wang, Jason Macintosh, Bruce Lewis, Bailey L. Duchêne, Gaspard Metchev, Stanimir Abbas, Asif Xuan, Jerry W. Sanghi, Aniket Panience, Jennifer Barman, Travis S. Bulger, Joanna Chilcote, Jeffrey K. Esposito, Thomas M. Fitzgerald, Michael P. Follette, Katherine B. Gallamore, Hannah Goodsell, Stephen Graham, James R. Greenbaum, Alexandra Z. Hibon, Pascale Ingraham, Patrick Kalas, Paul Konopacky, Quinn M. Marchis, Franck Maire, Jérôme Marois, Christian Matthews, Brenda Mawet, Dimitri Millar-Blanchaer, Maxwell A. Oppenheimer, Rebecca Palmer, David W. Perrin, Marshall D. Pointer, Lisa Pueyo, Laurent Rajan, Abhijith Rameau, Julien Rantakyrö, Fredrik T. Ren, Bin Ruffio, Jean-Baptiste Savransky, Dmitry Schneider, Adam C. Sivaramakrishnan, Anand Smith, Adam J. R. W. Song, Inseok Summer, Remi Thomas, Sandrine Ward-Duong, Kimberly Wolff, Schuyler G. Earth and Planetary Astrophysics Solar and Stellar Astrophysics HD~143811~AB is the host star to the directly imaged planet HD~143811~AB~b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2. A member of the Sco-Cen star-forming region with an age of $13 \pm 4$ Myr, HD~143811~AB is somewhat rare among hosts of directly imaged planets as it is a close stellar binary, with an $\sim$18 day period. Accurate values for the orbital and stellar parameters of this binary are needed to understand the formation and evolutionary history of the planet in orbit. We utilize archival high-resolution spectroscopy from FEROS on the MPG/ESO 2.2-meter telescope to fit the orbit of the binary, and combine with unresolved photometry to derive the basic stellar properties of the system. From the orbit, we derive precise values of orbital period of $18.59098 \pm 0.00007$ days, and mass ratio of $0.885 \pm 0.003$. When combined with stellar evolutionary models, we find masses of both components of $M_A = 1.30^{+0.03}_{-0.05}$ M$_\odot$ and $M_B = 1.15^{+0.03}_{-0.04}$ M$_\odot$. While the current data are consistent with the planet and stellar orbits being coplanar, the 3D orientations of both systems are currently poorly constrained, with additional observations required to more rigorously test for coplanarity. |
| title | Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2509.06727 |