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 4

Stellar parameters for HATS-2.

Parameter	Value	Source

Spectroscopic properties
T_eff ⋆ (K)...........................	5227 ± 95	SME
[Fe/H]..............................	0.15 ± 0.05	SME
vsini_⋆ (km s^-1)....................	1.5 ± 0.5	SME
log g_⋆ (cgs)...........	4.44 ± 0.12	SME
v_mic (km s^-1)^a.............	1.5	SME
v_mac (km s^-1)^a............	2.0	SME

Photometric properties
V (mag)........................	13.562 ± 0.016	APASS¹
B (mag)........................	14.490 ± 0.031	APASS
g (mag)........................	13.991 ± 0.012	APASS
r (mag)........................	13.260 ± 0.020	APASS
i (mag)........................	13.018 ± 0.021	APASS
J (mag)........................	11.906 ± 0.024	2MASS²
H (mag)........................	11.475 ± 0.023	2MASS
K (mag)........................	11.386 ± 0.023	2MASS

Derived properties
M_⋆ (M_⊙).......................	0.882 ± 0.037	YY+a/R_⋆+SME
R_⋆ (R_⊙).........................	0.898 ± 0.019	YY+a/R_⋆+SME
log g_⋆ (cgs)......................	4.48 ± 0.02	YY+a/R_⋆+SME
L_⋆ (L_⊙)..........................	0.54 ± 0.06	YY+a/R_⋆+SME
M_V (mag).........................	5.61 ± 0.13	YY+a/R_⋆+SME
M_K (mag).......................	3.64 ± 0.07	YY+a/R_⋆+SME
Age (Gyr)...............................	9.7 ± 2.9	YY+a/R_⋆+SME
Distance (pc)^b.........................	360 ± 11	YY+a/R_⋆+SME
P _⋆ ,rot (d) ^c...............	30.32 ± 10.13

Notes.

⁽¹⁾

The AAVSO (American Association of Variable Star Observers). Photometric All-Sky Survey

⁽²⁾

Two Micron All Sky Survey

^(a)

given values for micro- (v_mic) and macroturbulence (v_mac) are initial guesses, which were fixed during the analysis. Afterwards, the values were set free, but parameters were consistent with the fixed scenario within error bars. Therefore, the stellar parameters given here and used throughout the following analysis are the ones determined with fixed micro- and macroturbulence.

^(b)

A_V corrected.

^(c)

upper limit of the rotational period of HATS-2 using the determined values for vsini_⋆ and R_⋆.

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