The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation

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Volume 549 (January 2013)

A&A, 549 (2013) A10

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Table 5

Table of parameters for the non-TTV and two TTV models that have been analysed.

Parameter	Prior range	Prior type	Mean	St. Dev.	MAP	ln(evidence)	Probability

Linear T_mid = P·E + T₀						134.98	0.9999
T ₀ ^a	± 0.0002	Uniform	2 455 320.535732		2 455 320.535533
Pin days	± 0.0000002	Uniform	1.580405	0.000015	1.580340

Interior perturer: T_mid = TTV(a,m,λ,E) + T₀						122.09	3 × 10^-6
T ₀ ^a	± 0.0002	Uniform	–0.000003	0.0001	0.0001
λ	0 − 2π	Uniform	3.1	1.2	1.9
P in days	0.76–1.23	Jeffrey	0.9	0.1	0.9
m in M_⊙^b	0.0000003–0.0000135	Uniform	0.0000009	0.000001	0.0000006

Exterior perturber: T_mid = TTV(a,m,λ,E) + T₀						122.71	5 × 10^-6
T ₀ ^a	± 0.0002	Uniform	0.000002	0.0001	0.00004
λ	0 − 2π	Uniform	3.1	1.4	6.0
P in days	1.91–3.18	Jeffrey	2.7	0.3	2.7
m in M_⊙^b	0.0000003–0.000018	Uniform	0.0000002	0.000002	0.0000005

Notes.

^(a)

Nuisance parameter marginalised out.

^(b)

These are scale parameters and should have a Jeffrey prior according to Gregory (2005).

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