Molecules in the transition disk orbiting T Chamaeleontis

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Table 2

Results.

Transition	ν	T _peak	v _d	q ^a	p _d ^b	Flux^c
	(GHz)	(mK)	(km s^-1)			(Jy km s^-1)


¹²CO (3–2)	345.796000	38.1 ± 2.3	3.5 ± 0.2^d	0.5	0.27 ± 0.03	12.7 ± 1.2
¹³CO (3–2)	330.587960	20.0 ± 5.4	3.5^d^,^e	0.5	0.27^e	7.0 ± 2.1
HCO⁺ (4–3)	356.734242	13.2 ± 3.6	5.5 ± 1.2^f	–	–	7.4 ± 2.5
HCN (4–3)	354.505469	9.5 ± 3.9	4.9 ± 1.6^f	–	–	4.9 ± 2.5
CN (3–2)	340.247781	9.5 ± 3.4	3.6 ± 1.1^f	–	–	3.7 ± 1.6

Notes. Results from the fit of the CO lines with a Keplerian disk model profile (see Sect. 3) and of the other lines with a Gaussian.

^(a)

Power law index of the radial temperature profile within the disk. Fixed at a canonical value.

^(b)

Parameter that describes the outer disk cutoff.

^(c)

Converted from K km s^-1 to Jy km s^-1, using the conversion factor for APEX reported at the website http://www.apex-telescope.org/telescope/efficiency/.

^(d)

One half of the differences between red and blue peak velocities.

^(e)

Assumed equal to the value derived from the fit of the ¹²CO (3–2) line.

^(f)

Standard deviation of the best fit Gaussian.

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