HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity

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Volume 558 (October 2013)

A&A, 558 (2013) A55

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Table 5

Orbital and planetary parameters for the HATS-2 system for different fitting scenarios, including the light curve distortions with free and fixed eccentricity e and excluding the light curve distortions with a fixed circular orbit.

Parameter	LC distortions included, e ≡ 0	LC distortions included, free e	LC distortions excluded,e ≡ 0

Light curve parameters
P (days)........................	1.354133 ± 0.000001	1.354133 ± 0.000001	1.354133 ± 0.000001
T_c (BJD)^a..................................	2 455 954.58576 ± 0.00008	2455951.87748 ± 0.00009	2 455 954.58576 ± 0.00009
T₁₄ (days)^a........................	0.0859 ± 0.0004	0.0859 ± 0.0004	0.0862 ± 0.0004
T₁₂ = T₃₄ (days)^a........................	0.0104 ± 0.0004	0.0107 ± 0.0004	0.0109 ± 0.0005
a/R_⋆........................		5.65 ± 0.32	5.50 ± 0.09
ζ/R_⋆^b........................	26.48 ± 0.06	26.58 ± 0.07	26.52 ± 0.07
R_p/R_⋆	0.1317 ± 0.0007	0.1326 ± 0.0008	0.1335 ± 0.0010
b ≡ acosi_p/R_⋆........................
i_p (deg)........................	87.8 ± 0.7	87.4 ± 0.7	87.2 ± 0.7

Limb-darkening coefficients ^c
a^g (linear term)........................	0.7052	0.7052	0.7052
b^g (quadratic term)........................	0.1168	0.1168	0.1168
a _r........................	0.4756	0.4756	0.4756
b _r........................	0.2487	0.2487	0.2487
a _i........................	0.3617	0.3617	0.3617
b _i........................	0.2744	0.2744	0.2744
a _z........................	0.2861	0.2861	0.2861
b _z........................	0.2873	0.2873	0.2873

Radial velocity parameters
K (m s^-1)........................	272.2 ± 30.5	278.7 ± 33.0	268.9 ± 29.0
ecosω........................	0.000	− 0.033 ± 0.052	0.000
esinω........................	0.000	− 0.023 ± 0.060	0.000
e ^d........................	0.000	0.071 ± 0.049	0.000
ω (deg)........................	0.000	216 ± 77	0.000
RV jitter Coralie (m s^-1)........................	74.0	74.0	74.0
RV jitter FEROS (m s^-1)........................	44.0	44.0	44.0
RV jitter CYCLOPS (m s^-1)........................	193.0	193.0	193.0

Planetary parameters
M_p (M_J)........................	1.369 ± 0.158	1.397 ± 0.171	1.345 ± 0.150
R_p (R_J)........................	1.139 ± 0.025	1.131 ± 0.065	1.168 ± 0.030
C(M_p,R_p)^e........................	0.11	-0.26	0.08
ρ_p (g/cm³)........................	1.15 ± 0.15	1.20 ± 0.28	1.05 ± 0.14
log g_p (cgs)........................	3.42 ± 0.05	3.43 ± 0.08	3.39 ± 0.05
a (AU)........................	0.0230 ± 0.0003	0.0230 ± 0.0003	0.0230 ± 0.0003
T_eq (K)........................	1567 ± 30	1554 ± 57	1577 ± 31
Θ^f........................	0.062 ± 0.007	0.064 ± 0.009	0.060 ± 0.007
⟨ F ⟩ (10⁸ erg s^-1 cm^-2)^g........................	1.36 ± 0.11	1.32 ± 0.20	1.40 ± 0.11

Notes.The last scenario was adopted for further analysis steps (parameters are highlighted in bold font).

^(a)

T_C: Reference epoch of mid transit that minimizes the correlation with the orbital period. BJD is calculated from UTC. T₁₄: total transit duration, time between first to last contact; T₁₂ = T₃₄: ingress/egress time, time between first and second, or third and fourth, contacts.

^(b)

Reciprocal of the half duration of the transit used as a jump parameter in our MCMC analysis in place of a/R_⋆. It is related to a/R_⋆ by the expression (Bakos et al. 2010).

^(c)

Values for a quadratic law given separately for the Sloan g, r, i and z filters. These values were adopted from the tabulations by Claret (2004) according to the spectroscopic (SME) parameters listed in Table 4.

^(d)

Uncertainties on the eccentricity e incorporate the estimated RV jitter

^(e)

Correlation coefficient between the planetary mass M_p and radius R_p.

^(f)

The Safronov number is given by Θ = (1/2)(V_esc/V_orb)² = (a/R_p)·(M_p/M_⋆) (see Hansen & Barman 2007).

^(g)

Incoming flux per unit surface area, averaged over the orbit.

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