True Mass and Atmospheric Composition of the Nontransiting Hot Jupiter HD 143105 b

True Mass and Atmospheric Composition of the Nontransiting Hot Jupiter HD 143105 b

We present Keck/KPIC Phase II K -band observations of the nontransiting hot Jupiter HD 143105 b. Using a cross-correlation approach, we make the first detection of the planetary atmosphere at ${K}_{{\rm{p}}}=18{5}_{-13}^{+11}$ km s ^−1 and an inferior conjunction time 2.5 hr before the previously pu...

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Main Authors: Luke Finnerty, Yinzi Xin, Jerry W. Xuan, Julie Inglis, Michael P. Fitzgerald, Shubh Agrawal, Ashley Baker, Randall Bartos, Geoffrey A. Blake, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppmann, Daniel Echeverri, Katelyn Horstman, Chih-Chun Hsu, Nemanja Jovanovic, Joshua Liberman, Ronald A. López, Emily C. Martin, Dimitri Mawet, Evan Morris, Jacklyn Pezzato-Rovner, Jean-Baptiste Ruffio, Ben Sappey, Tobias Schofield, Andrew Skemer, Taylor Venenciano, J. Kent Wallace, Nicole L. Wallack, Jason J. Wang, Ji Wang
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astronomical Journal
Subjects:
Exoplanet atmospheres
Exoplanet atmospheric composition
Hot Jupiters
High resolution spectroscopy
Online Access:https://doi.org/10.3847/1538-3881/ada1d9
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Summary:We present Keck/KPIC Phase II K -band observations of the nontransiting hot Jupiter HD 143105 b. Using a cross-correlation approach, we make the first detection of the planetary atmosphere at ${K}_{{\rm{p}}}=18{5}_{-13}^{+11}$ km s ^−1 and an inferior conjunction time 2.5 hr before the previously published ephemeris. The retrieved K _p value, in combination with the orbital period, mass of the host star, and lack of transit detection, give an orbital inclination of $7{8}_{-12}^{\circ +2}$ and a true planet mass of 1.23 ± 0.10 M _J . While the equilibrium temperature of HD 143105 b is in the transition regime between noninverted and inverted atmospheres, our analysis strongly prefers a noninverted atmosphere. Retrieval analysis indicates the atmosphere of HD 143105 b is cloud free to approximately 1 bar and dominated by H _2 O absorption ( ${\mathrm{logH}}_{2}{{\rm{O}}}_{\mathrm{MMR}}=-3.{9}_{-0.5}^{+0.8}$ ), placing only an upper limit on the CO abundance ( ${\mathrm{logCO}}_{\mathrm{MMR}}\lt -3.7$ at 95% confidence). We place no constraints on the abundances of Fe, Mg, or ^13 CO. From these abundances, we place an upper limit on the carbon-to-oxygen ratio for HD 143105 b, C/O < 0.2 at 95% confidence, and find the atmospheric metallicity is approximately 0.1 × solar. The low metallicity may be responsible for the lack of a thermal inversion, which at the temperature of HD 143105 b would likely require significant opacity from TiO and/or VO. With these results, HD 143105 b joins the small number of nontransiting hot Jupiters with detected atmospheres.
ISSN:1538-3881

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