Millimeter observations and modeling of the AB Aurigae system

Abstract

(Abriged) We present the results of millimeter observations and a suitable chemical and radiative transfer model of the AB Aur (HD 31293) circumstellar disk and surrounding envelope. The integral molecular content of this system is studied by observing CO, C${}^{18}$O, CS, HCO${}^{+}$, DCO${}^{+}$, H${}_2$CO, HCN, HNC, and SiO rotational lines with the IRAM 30-m antenna, while the disk is mapped in the HCO${}^{+}$(1-0) transition with the Plateau de Bure interferometer. Using a flared disk model with a vertical temperature gradient and an isothermal spherical envelope model with a shadowed midplane and two unshielded cones together with a gas-grain chemical network, time-dependent abundances of observationally important molecules are calculated. Then a 2D non-LTE line radiative transfer code is applied to compute excitation temperatures of several rotational transitions of HCO${}^{+}$, CO, C${}^{18}$O, and CS molecules. We synthesize the HCO${}^{+}$(1-0) interferometric map along with single-dish CO(2-1), C${}^{18}$O(2-1), HCO${}^{+}$(1-0), HCO${}^{+}$(3-2), CS(2-1), and CS(5-4) spectra and compared them with the observations. Our disk model successfully reproduces observed interferometric HCO${}^{+}$(1-0) data, thereby constraining the following disk properties: (1) the inclination angle $ι=17^{+6}_{-3}\degr$, (2) the position angle $ϕ=80\pm30\degr$, (3) the size $R_{\mathrm{out}}=400\pm 200$ AU, (4) the mass $M_\mathrm{disk}=1.3\cdot10^{-2} M_{\sun}$ (with a factor of $\sim 7$ uncertainty), and (5) that the disk is in Keplerian rotation. Furthermore, indirect evidence for a local inhomogeneity of the envelope at $\ga600$ AU is found...

62 pages, 13 figures, 7 tables, accepted for publication in ApJ

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