Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b

Abstract 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 ± 4 Myr, HD 143811 AB is somewhat rare among hosts of directly imaged planets, as it is a close stellar binary, with an ∼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 m telescope to fit the orbit of the binary, and we combine with unresolved photometry to derive the basic stellar properties of the system. From the orbit, we derive precise values of orbital period of 18.59090 ± 0.00007 days and mass ratio of 0.886 ± 0.003. When combined with stellar evolutionary models, we find masses of both components of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi mathvariant="normal">A</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.3</mml:mn> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.05</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.03</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> M ⊙ and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi mathvariant="normal">B</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.1</mml:mn> <mml:msubsup> <mml:mn>5</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.04</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.03</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> M ⊙ . 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.

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Journal
The Astrophysical Journal Letters
Published
2025-12-11
DOI
https://doi.org/10.3847/2041-8213/ae1a67
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1
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Stellar, planetary, and galactic studies
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article
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article

Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b

Brenda C. Matthews, A. Abbas, Adam C. Schneider, Christian Marois et al.
1 citations
The Astrophysical Journal Letters
Stellar, planetary, and galactic studies
1.15
article

Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b

Brenda C. Matthews, A. Abbas, Adam C. Schneider, Christian Marois, William Roberson, Stephen J. Goodsell, Maxwell A. Millar‐Blanchaer, Gaspard Duchêne, Aniket Sanghi, Dmitry Savransky, Robert J. De Rosa, B. Lewis, E. Nielsen, Adam J. R. W. Smith, Katherine B. Follette, Patrick Ingraham, Thomas M. Esposito, Stanimir Metchev, Anand Sivaramakrishnan, Marshall D. Perrin, Paul Kalas, Pascale Hibon, Bruce Macintosh, Kimberly Ward-Duong, Schuyler Wolff, Jean-Baptiste Ruffio, J. Patience, Inseok Song, Abhijith Rajan, Bin Ren, Dimitri Mawet, Jeffrey Chilcote, Rebecca Oppenheimer, Hannah Gallamore, Julien Rameau, Anne E. Peck, Fredrik T. Rantakyrö, Quinn Konopacky, Travis Barman, Franck Marchis, Rémi Soummer, Jérôme Maîre, Lisa Poyneer, Alexandra Z. Greenbaum, J. Bulger, Sandrine Thomas, Michael P. Fitzgerald, Jerry W. Xuan, Jason Wang, David W. Palmer, Laurent Pueyo, N. Jones, James R. Graham
article en
1 citations

Abstract

Abstract 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 ± 4 Myr, HD 143811 AB is somewhat rare among hosts of directly imaged planets, as it is a close stellar binary, with an ∼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 m telescope to fit the orbit of the binary, and we combine with unresolved photometry to derive the basic stellar properties of the system. From the orbit, we derive precise values of orbital period of 18.59090 ± 0.00007 days and mass ratio of 0.886 ± 0.003. When combined with stellar evolutionary models, we find masses of both components of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi mathvariant="normal">A</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.3</mml:mn> <mml:msubsup> <mml:mn>0</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.05</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.03</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> M ⊙ and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi mathvariant="normal">B</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.1</mml:mn> <mml:msubsup> <mml:mn>5</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.04</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.03</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> M ⊙ . 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.

The Astrophysical Journal LettersVol. 995(2)
New Mexico State University (US), University of Notre Dame (US), Northwestern University (US), California Institute of Technology (US), Herzberg Institute of Astrophysics (CA), Western University (CA), Lawrence Livermore National Laboratory (US), Centre National de la Recherche Scientifique (FR), Space Telescope Science Institute (US), Planetary Science Institute (US), University of Hawaii System (US), Jet Propulsion Laboratory (US), American Museum of Natural History (US), University of Arizona (US), University of California, Santa Barbara (US), University of California, Los Angeles (US), George Mason University (US), University of Georgia (US), Amherst College (US), University of California, Santa Cruz (US), Durham University (GB), Smith College (US), Cornell University (US), University of Victoria (CA), University of California San Diego (US), Université Bourgogne Franche-Comté (FR), Gemini South Observatory (CL), Observatoire de la Côte d’Azur (FR), European Southern Observatory (CL), United States Naval Observatory (US), NSF-DOE Vera C. Rubin Observatory (CL), Infrared Processing and Analysis Center (US), Arizona State University (US), Université de Montréal (CA), Search for Extraterrestrial Intelligence (US), Foundation for Research and Technology Hellas (GR), Université Grenoble Alpes (FR), University of California, Berkeley (US)
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Stellar, planetary, and galactic studies
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