Transiting exoplanets from the CoRoT space mission - XXVIII. CoRoT-33b, an object in the brown dwarf desert with 2:3 commensurability with its host star

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Volume 584 (December 2015)

A&A, 584 (2015) A13

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Table 4

Physical and geometrical parameters of the CoRoT-33 system.

Determined from photometry

Epoch of transit T₀ [BJD−2 450 000]	6676.3992 ± 0.0037
Epoch of periastron T₀ [BJD−2 450 000]	6677.7130 ± 0.0140
Orbital period (days)	5.819143 ± 0.000018
Duration of the transit (h)	1.4 h
Depth of the transit (%)	0.28%

Determined from RV measurements

Orbital eccentricity e	0.0700 ± 0.0016
Argument of periastron ω [deg]	179.3 ± 0.87
RV semi-amplitude K [ km s^-1]	7.0609 ± 0.0094
Systemic velocity V_γ [ km s^-1], HARPS	21.5375 ± 0.0158
Systemic velocity V_γ [ km s^-1], FIES	21.5544 ± 0.0222
O−C residuals^a [ m s^-1]	36

Determined from spectral analysis of the star

T_eff [K]	5225 ± 80
log g_∗ [cgs]	4.4 ± 0.1
[Fe/H]	0.44 ± 0.1
[Ni/H]	0.4 ± 0.1
[V/H]	0.4 ± 0.1
[Mg/H]	0.4 ± 0.1
[Ca/H]	0.3 ± 0.1
[Si/H]	0.2 ± 0.1
vsini_∗ [km s^-1]	5.7 ± 0.4
Spectral type	G9V
V _mic	0.86 ± 0.1 km s^-1
	2.7 ± 0.6 km s^-1

Determined from light curve modeling

a / R _star	13.23 ± 1.17
b	1.04 ± 0.06
i_planet [deg]	85.5 ± 0.5
k	0.12 ± 0.04
Contamination [%]	13 ± 4^c

Combined results

Stellar mass M_st [solar]	0.86
Stellar radius R_st [solar]	0.94
Stellar age [Gyr]	>4.6
Orbital semi-major axis a [AU]	0.0579^d
Brown dwarf mass M_BD [M_J]	59.0
Brown dwarf radius R_BD [R_J]	1.10 ± 0.53
Brown dwarf mean density ρ_BD [g cm^-3]	55 ± 29

Notes. Inclination (i) was calculated from the a/R_star ratio and from the impact parameter b. The parameter M^1/3/R can be calculated from the orbital period and from the a/R_star value (see e.g. Winn 2010).

^(a)

Root mean square of the residuals of the RV curve.

^(b)

Fixed at this value, based on the calibration by Doyle et al. (2014).

^(c)

Calculated from period and masses via Kepler’s third law, not from RV.

^(d)

From modeling results.

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