Figure 9 from Project 1640 Observations of Brown Dwarf GJ 758 B: Near-infrared Spectrum and Atmospheric Modeling

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Project 1640 Observations of Brown Dwarf GJ 758 B: Near-infrared Spectrum and Atmospheric Modeling

Authors: R. Nilsson, A. Veicht, P. A. Giorla Godfrey, E. L. Rice, J. Aguilar, L. Pueyo, L. C. Roberts, R. Oppenheimer, D. Brenner, S. H. Luszcz-Cook, E. Bacchus, C. Beichman, R. Burruss, E. Cady, R. Dekany, R. Fergus, L. Hillenbrand, S. Hinkley, D. King, T. Lockhart, I. R. Parry, A. Sivaramakrishnan, R. Soummer, G. Vasisht, C. Zhai, and N. T. Zimmerman

2017 The Astrophysical Journal 838 64.

Provider: AAS Journals

Caption: Figure 9.

Posterior distributions of the MCMC analysis using 10⁶ steps for the complete Y JH spectrum (purple), YJ (red), and H (blue) S4 extracted spectrum of GJ 758 B. Histograms show the distributions marginalized over gravity (top left) and temperature (bottom right). Model fits to the low-resolution near-infrared spectrum from P1640 provide a better constraint in temperature than in surface gravity. GJ 758 B has a temperature of T_eff = 741 ± 25 K and a surface gravity of ﹩\mathrm{log}g=4.3\pm 1.0﹩ dex (cgs) (1-σ uncertainties).

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