The infrared colors of 51 Eridani b: micrometereoid dust or chemical disequilibrium?

Abstract

We reanalyze near-infrared spectra of the young extrasolar giant planet 51 Eridani b which was originally presented in (Macintosh et al. 2015) and (Rajan et al. 2017) using modern atmospheric models which include a self-consistent treatment of disequilibrium chemistry due to turbulent vertical mixing. In addition, we investigate the possibility that significant opacity from micrometeors or other impactors in the planet's atmosphere may be responsible for shaping the observed spectral energy distribution (SED). We find that disequilibrium chemistry is useful for describing the mid-infrared colors of the planet's spectra, especially in regards to photometric data at M band around 4.5 $\mu$m which is the result of super-equilibrium abundances of carbon monoxide, while the micrometeors are unlikely to play a pivotal role in shaping the SED. The best-fitting, micrometeroid-dust-free, disequilibrium chemistry, patchy cloud model has the following parameters: effective temperature $T_{\text{eff}}=681$ K with clouds (or without clouds, i.e. the grid temperature $T_{\text{grid}}$ = 900 K), surface gravity $g$ = 1000 m/s${}^2$, sedimentation efficiency $f_{\text{sed}}$ = 10, vertical eddy diffusion coefficient $K_{\text{zz}}$ = 10${}^3$ cm${}^2$/s, cloud hole fraction $f_{\text{hole}}$ = 0.2, and planet radius $R_{\text{planet}}$ = 1.0 R${}_{\text{Jup}}$.

arXiv comment22 pages, 14 figures, Accepted to AJ

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Cited by in corpus (3)

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• JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO${}_2$ in the HR 8799 and 51 Eri Exoplanets' Atmospheres
• Direct Spectroscopy of 51 Eridani b with JWST NIRSpec