Resolved gas cavities in transitional disks inferred from CO isotopologs with ALMA

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Volume 585 (January 2016)

A&A, 585 (2016) A58

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Table 3

Results for the gas density profile of each transition disk.

	Parameter	HD	SR	DoAr	IRS
		13^a	21	44	48

Surface	r_c (AU)	25	15	25	60
density	Σ_c (g cm^-2)	120	400	60	0.5
	gas-to-dust ratio	80	100	100	12
	M_dust^b (10)	0.13	0.075	0.05	0.015
	M_gas^b (10)	15	7.7	2.5	0.55

Radial	r_cavgas (AU)^d	30	7	16	25
structure	δ _gas2 ^d	2 × 10^-4	10^-20 ^c	≤ 10^-4	≤ 10^-3
	r_cavdust (AU)	40	25	32	60
	δ _gas ^d	1	5 × 10^-2	10^-2	1
	r_out (AU)	125	60	60	90

Inner	r_sub (AU)	0.18	0.18	0.08	0.4
disk	r_gap (AU)	0.25	1.0	1.0	1.0
	δ_dust (AU)	2 × 10^-4	1 × 10^-6	1 × 10^-2	1 × 10^-3

Vertical	h_c (rad)	0.15	0.07	0.1	0.14
structure	ψ	0.05	0.15	0.1	0.22
	f _ls	0.95	0.85	0.85	0.85
	χ	0.8	0.2	0.2	0.2

Notes.

^(a)

HD13 = HD 135344B.

^(b)

The masses are only constrained within r_out for the detected surface brightness.

^(c)

The drop inside 7 AU could not be constrained by the ALMA data; we adopt the value from CO rovibrational spectroastrometry by Pontoppidan et al. (2008).

^(d)

The uncertainties on the gas cavity size are typically ≲5 AU and lower than one order of magnitude on the depth of the drop.

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