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 6

Photometric parameters derived from the GEMC fitting of the GROND transit light curves.

1st transit
Parameter	Symbol	g	r	i	z

Radius ratio	R_p/R_⋆	0.1348 ± 0.0011	0.1324 ± 0.0011	0.13145 ± 0.00096	0.1352 ± 0.0010
Sum of fractional radii	r_p + r_⋆	0.2204 ± 0.0018	0.2232 ± 0.0018	0.2149 ± 0.0016	0.2161 ± 0.0015
Linear LD coefficient	u ₁	0.749 ± 0.060	0.593 ± 0.051	0.352 ± 0.057	0.298 ± 0.039
Quadratic LD coefficient	u ₂	0.171 ± 0.018	0.296 ± 0.043	0.218 ± 0.028	0.144 ± 0.024
Inclination (degrees)^a	i _p	85.26 ± 0.40	85.26 ± 0.40	85.26 ± 0.40	85.26 ± 0.40
Longitude of spot (degrees)^a^,^b	θ	5.78 ± 0.45	5.78 ± 0.45	5.78 ± 0.45	5.78 ± 0.45
Latitude of Spot (degrees)^a^,^c	φ	76.52 ± 1.94	76.52 ± 1.94	76.52 ± 1.94	76.52 ± 1.94
Spot angular radius (degrees)^d	r _spot	8.85 ± 0.61	10.01 ± 0.72	8.93 ± 0.65	8.72 ± 0.50
Spot contrast^e	ρ _spot	0.304 ± 0.035	0.546 ± 0.048	0.464 ± 0.052	0.251 ± 0.52

2nd transit
Radius ratio	R_p/R_⋆	−	0.1356 ± 0.0012	0.13411 ± 0.00093	0.1307 ± 0.0011
Sum of fractional radii	r_p + r_⋆	−	0.2108 ± 0.0019	0.2022 ± 0.0012	0.2039 ± 0.0017
Linear LD coefficient	u ₁	−	0.473 ± 0.057	0.399 ± 0.049	0.252 ± 0.044
Quadratic LD coefficient	u ₂	−	0.250 ± 0.038	0.230 ± 0.025	0.316 ± 0.049
Inclination (degrees)^a	i _p	−	85.89 ± 0.40	85.89 ± 0.40	85.89 ± 0.40
Longitude of spot (degrees)^a^,^b	θ	−	35.26 ± 1.20	35.26 ± 1.20	35.26 ± 1.20
Latitude of Spot (degrees)^a^,^c	φ	−	80.60 ± 2.10	80.60 ± 2.10	80.60 ± 2.10
Spot angular radius (degrees)^d	r _spot	−	20.14 ± 1.49	17.79 ± 2.17	18.28 ± 2.31
Spot contrast ^e	ρ _spot	−	0.753 ± 0.046	0.780 ± 0.054	0.789 ± 0.047

Notes.

^(a)

This is a common value and was found from the preceding fit of the combined data (see text).

^(b)

The longitude of the centre of the spot is defined to be 0° at the centre of the stellar disc and can vary from − 90° to 90°.

^(c)

The latitude of the centre of the spot is defined to be 0° at the north pole and 180° at the south pole.

^(d)

Note that 90° degrees covers half of stellar surface.

^(e)

Note that 1.0 equals to the surrounding photosphere.

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