HD 206893 B at High Spectral Resolution with the Keck Planet Imager and Characterizer (KPIC)
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| Formato: | Preprint |
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2025
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| author | Sappey, Ben Konopacky, Quinn O, Clarissa R. Do Barman, Travis Ruffio, Jean-Baptiste Wang, Jason Theissen, Christopher A. Finnerty, Luke Xuan, Jerry Hortsman, Katelyn Mawet, Dimitri Zhang, Yapeng Inglis, Julie Wallack, Nicole L. Sanghi, Aniket Baker, Ashley Bartos, Randall Blake, Geoffrey A. Bond, Charlotte Z. Calvin, Benjamin Cetre, Sylvain Delorme, Jacques-Robert Doppmann, Greg Echeverri, Daniel Fitzgerald, Michael P. Hsu, Chih-Chun Jovanovic, Nemanja Liberman, Joshua Lopez, Ronald A. Martin, Emily C. Morris, Evan Pezzato-Rovner, Jacklyn Phillips, Caprice L. Ruane, Garreth Schofield, Tobias Skemer, Andrew Venenciano, Taylor Wallace, J. Kent Wang, Ji Wizinowich, Peter Xin, Yinzi |
| author_facet | Sappey, Ben Konopacky, Quinn O, Clarissa R. Do Barman, Travis Ruffio, Jean-Baptiste Wang, Jason Theissen, Christopher A. Finnerty, Luke Xuan, Jerry Hortsman, Katelyn Mawet, Dimitri Zhang, Yapeng Inglis, Julie Wallack, Nicole L. Sanghi, Aniket Baker, Ashley Bartos, Randall Blake, Geoffrey A. Bond, Charlotte Z. Calvin, Benjamin Cetre, Sylvain Delorme, Jacques-Robert Doppmann, Greg Echeverri, Daniel Fitzgerald, Michael P. Hsu, Chih-Chun Jovanovic, Nemanja Liberman, Joshua Lopez, Ronald A. Martin, Emily C. Morris, Evan Pezzato-Rovner, Jacklyn Phillips, Caprice L. Ruane, Garreth Schofield, Tobias Skemer, Andrew Venenciano, Taylor Wallace, J. Kent Wang, Ji Wizinowich, Peter Xin, Yinzi |
| contents | We present an atmospheric characterization and orbital analysis of HD 206893 B, an exceptionally red, L/T-transition substellar companion in a multiplanetary system, via Keck Planet Imager and Characterizer (KPIC) high-resolution (R $\sim$ 35,000) K-band spectroscopy. Using PHOENIX atmospheric models in a forward-model framework that fits the spectrum of the companion and diffracted starlight simultaneously, we detect HD 206893 B at $>8σ$ significance via cross-correlation in two epochs. We find an effective temperature for the companion of $1634^{+72}_{-38}$ K and a log(g) of $4.55^{+0.17}_{-0.22}$. Only accounting for statistical uncertainties, we measure the carbon-oxygen ratio (C/O) of this companion to be $0.57 \pm 0.02$, or near-solar while assuming solar metallicity. The C/O ratio we measure fits the tentative trend of $>4 M_{Jup}$ companions having near-solar C/O ratios while less massive companions have greater-than-solar C/O ratios. Using substellar evolution models, we find an age of $112^{+36}_{-22}$ Myr, a mass of $22.7^{+2.5}_{-1.7} M_{Jup}$, and a radius of $1.11 \pm 0.03 R_{Jup}$ for this companion. We also use KPIC radial velocity data to fit the orbit of HD 206893 B and analyze the orbital stability of this system. We find that the orbital stability is relatively independent of the mass of HD 206893 B, and favors an orbital configuration where B and its interior planetary companion, HD 206893 c, are co-planar. The measured C/O ratio coupled with the current architecture of the system cannot rule out a core accretion scenario, nor a disk fragmentation scenario regarding the formation pathway of HD 206893 B. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13917 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HD 206893 B at High Spectral Resolution with the Keck Planet Imager and Characterizer (KPIC) Sappey, Ben Konopacky, Quinn O, Clarissa R. Do Barman, Travis Ruffio, Jean-Baptiste Wang, Jason Theissen, Christopher A. Finnerty, Luke Xuan, Jerry Hortsman, Katelyn Mawet, Dimitri Zhang, Yapeng Inglis, Julie Wallack, Nicole L. Sanghi, Aniket Baker, Ashley Bartos, Randall Blake, Geoffrey A. Bond, Charlotte Z. Calvin, Benjamin Cetre, Sylvain Delorme, Jacques-Robert Doppmann, Greg Echeverri, Daniel Fitzgerald, Michael P. Hsu, Chih-Chun Jovanovic, Nemanja Liberman, Joshua Lopez, Ronald A. Martin, Emily C. Morris, Evan Pezzato-Rovner, Jacklyn Phillips, Caprice L. Ruane, Garreth Schofield, Tobias Skemer, Andrew Venenciano, Taylor Wallace, J. Kent Wang, Ji Wizinowich, Peter Xin, Yinzi Earth and Planetary Astrophysics Solar and Stellar Astrophysics We present an atmospheric characterization and orbital analysis of HD 206893 B, an exceptionally red, L/T-transition substellar companion in a multiplanetary system, via Keck Planet Imager and Characterizer (KPIC) high-resolution (R $\sim$ 35,000) K-band spectroscopy. Using PHOENIX atmospheric models in a forward-model framework that fits the spectrum of the companion and diffracted starlight simultaneously, we detect HD 206893 B at $>8σ$ significance via cross-correlation in two epochs. We find an effective temperature for the companion of $1634^{+72}_{-38}$ K and a log(g) of $4.55^{+0.17}_{-0.22}$. Only accounting for statistical uncertainties, we measure the carbon-oxygen ratio (C/O) of this companion to be $0.57 \pm 0.02$, or near-solar while assuming solar metallicity. The C/O ratio we measure fits the tentative trend of $>4 M_{Jup}$ companions having near-solar C/O ratios while less massive companions have greater-than-solar C/O ratios. Using substellar evolution models, we find an age of $112^{+36}_{-22}$ Myr, a mass of $22.7^{+2.5}_{-1.7} M_{Jup}$, and a radius of $1.11 \pm 0.03 R_{Jup}$ for this companion. We also use KPIC radial velocity data to fit the orbit of HD 206893 B and analyze the orbital stability of this system. We find that the orbital stability is relatively independent of the mass of HD 206893 B, and favors an orbital configuration where B and its interior planetary companion, HD 206893 c, are co-planar. The measured C/O ratio coupled with the current architecture of the system cannot rule out a core accretion scenario, nor a disk fragmentation scenario regarding the formation pathway of HD 206893 B. |
| title | HD 206893 B at High Spectral Resolution with the Keck Planet Imager and Characterizer (KPIC) |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2501.13917 |