Fig. 1.

NOEMA images of the circumstellar disk around AB Aur. The 1mm continuum dust emission map, and the velocity-integrated intensity images from 3.5 to 8 km s⁻¹ of the ¹³CO J=2 →1, C¹⁸O J=2 →1, SO J=5₆ →4₅, and H₂CO J=3₀₃ →2₀₂ lines. White ellipses in the bottom left corner of each panel represents the beam size (~1″.6×1″5). Contour levels are 50% to 90% in steps 10% of the maximum value (34 mJy beam–1 for the continuum, 37 K × km s⁻¹ for the ¹³CO J=2→0, 15 K × km s⁻¹ for the C¹⁸O J=2→0, 2.3 K × km s⁻¹ for the H₂CO J=3_0,3 → 2_0,2, and 1.0 K × km s⁻¹ for the SO). The thick blue contour indicates the 50% level of the C¹⁸O emission. The arrow shows the direction of the ionized jet (Rodríguez et al. 2014).