Interpreting the extended emission around three nearby debris disc host stars

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Table 5

Modelling results summary (see text for details of parameters fitted in each method).

Parameter	HIP 22263	HIP 62207	HIP 72848

	Single annulus

R_in [au]	44 ± 1	82	63
θ [°]	10	106	58
i [°]	50 ± 2	63 ± 2	85
	1.16	1.45	1.29

	Modified blackbody^a
R_in [au]	22	72	74
R_out [au]	116	82	84
τ₀ [ × 10^-5 ]	8.2	38	11
α	–0.6	0	0
T_1au [K]	416	515	515
f _T	1.5	1.8	2.2
λ₀ [μm]	57	...	...
β	0.7	...	...
θ [ ° ]	7	105	64
i [ ° ]	51	56	>70
L_IR/L_⋆ [ × 10^-5 ]	3.1	2.4	1.0
	1.40	1.20	2.40

	GRaTeR^b
r₀ [au]	20.9 ± 4.5	53.7	57.8 ± 20.0
...	[20.8]	[53.7]	[66.9]
s_min [μm]	1.89	5.17	1.30
...	[2.15]	[5.86]	[0.12]
α	–1.00	–0.50	–5.00
...	[–0.50]	[–1.00]	[–5.00]
γ	3.9	4.3	3.7
...	[3.9]	[4.3]	[3.5]
M_dust [× 10^-4M_⊕]	6.06 ± 0.75	32.2	1.48
...	[6.10]	[26.9]	[2.00]
L_IR/L_⋆ [× 10^-5]	2.9	2.1	0.3
	0.65	0.59	0.33

Notes.

^(a)

The for HIP 72848 is higher because the background wasn’t added to the model, and there are nearby sources with significant emission. The modified part of the blackbody is not needed for HIP 62207 and HIP 72848, denoted by “...” for these parameter values. The ring width was fixed to 10 au for HIP 62207 and HIP 72848.

^(b)

The number in square brackets denotes the best fit value for each parameter when fitting all parameters simultaneously.

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