kappa And b is a fast rotator from KPIC High Resolution Spectroscopy
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arXiv
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| Natura: | Preprint |
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2024
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| author | Morris, Evan C. Wang, Jason J. Hsu, Chih-Chun Ruffio, Jean-Baptiste Xuan, Jerry W. Delorme, Jacques-Robert Hood, Callie Bryan, Marta L. Martin, Emily C. Pezzato, Jacklyn Mawet, Dimitri Skemer, Andrew Baker, Ashley Bartos, Randall Calvin, Benjamin Cetre, Sylvain Doppmann, Greg Echeverri, Daniel Finnerty, Luke Fitzgerald, Michael P. Jovanovic, Nemanja Liberman, Joshua Lopez, Ronald Sappey, Ben Schofield, Tobias Wallace, J. Kent Wang, Ji |
| author_facet | Morris, Evan C. Wang, Jason J. Hsu, Chih-Chun Ruffio, Jean-Baptiste Xuan, Jerry W. Delorme, Jacques-Robert Hood, Callie Bryan, Marta L. Martin, Emily C. Pezzato, Jacklyn Mawet, Dimitri Skemer, Andrew Baker, Ashley Bartos, Randall Calvin, Benjamin Cetre, Sylvain Doppmann, Greg Echeverri, Daniel Finnerty, Luke Fitzgerald, Michael P. Jovanovic, Nemanja Liberman, Joshua Lopez, Ronald Sappey, Ben Schofield, Tobias Wallace, J. Kent Wang, Ji |
| contents | We used the Keck Planet Imager and Characterizer (KPIC) to obtain high-resolution (R$\sim$35,000) K-band spectra of kappa Andromedae b, a planetary-mass companion orbiting the B9V star, kappa Andromedae A. We characterized its spin, radial velocity, and bulk atmospheric parameters through use of a forward modeling framework to jointly fit planetary spectra and residual starlight speckles, obtaining likelihood-based posterior probabilities. We also detected H$_{2}$O and CO in its atmosphere via cross correlation. We measured a $v\sin(i)$ value for kappa And b of $38.42\pm{0.05}$ km/s, allowing us to extend our understanding of the population of close in bound companions at higher rotation rates. This rotation rate is one of the highest spins relative to breakup velocity measured to date, at close to $50\%$ of breakup velocity. We identify a radial velocity $-17.35_{-0.09}^{+0.05}$ km/s, which we use with existing astrometry and RV measurements to update the orbital fit. We also measure an effective temperature of $1700\pm{100}$ K and a $\log(g)$ of $4.7\pm{0.5}$ cgs dex. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13125 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | kappa And b is a fast rotator from KPIC High Resolution Spectroscopy Morris, Evan C. Wang, Jason J. Hsu, Chih-Chun Ruffio, Jean-Baptiste Xuan, Jerry W. Delorme, Jacques-Robert Hood, Callie Bryan, Marta L. Martin, Emily C. Pezzato, Jacklyn Mawet, Dimitri Skemer, Andrew Baker, Ashley Bartos, Randall Calvin, Benjamin Cetre, Sylvain Doppmann, Greg Echeverri, Daniel Finnerty, Luke Fitzgerald, Michael P. Jovanovic, Nemanja Liberman, Joshua Lopez, Ronald Sappey, Ben Schofield, Tobias Wallace, J. Kent Wang, Ji Earth and Planetary Astrophysics We used the Keck Planet Imager and Characterizer (KPIC) to obtain high-resolution (R$\sim$35,000) K-band spectra of kappa Andromedae b, a planetary-mass companion orbiting the B9V star, kappa Andromedae A. We characterized its spin, radial velocity, and bulk atmospheric parameters through use of a forward modeling framework to jointly fit planetary spectra and residual starlight speckles, obtaining likelihood-based posterior probabilities. We also detected H$_{2}$O and CO in its atmosphere via cross correlation. We measured a $v\sin(i)$ value for kappa And b of $38.42\pm{0.05}$ km/s, allowing us to extend our understanding of the population of close in bound companions at higher rotation rates. This rotation rate is one of the highest spins relative to breakup velocity measured to date, at close to $50\%$ of breakup velocity. We identify a radial velocity $-17.35_{-0.09}^{+0.05}$ km/s, which we use with existing astrometry and RV measurements to update the orbital fit. We also measure an effective temperature of $1700\pm{100}$ K and a $\log(g)$ of $4.7\pm{0.5}$ cgs dex. |
| title | kappa And b is a fast rotator from KPIC High Resolution Spectroscopy |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2405.13125 |