How many suns are in the sky? A SPHERE multiplicity survey of exoplanet host stars - I. Four new close stellar companions including a white dwarf

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Table 1

Summary of the properties of our target systems.

System	SpTyp	d(pc)	age (Gyr)	M_P sin(i)	P_P (days)	e_P
HD 1666	F7 V	118.3 ± 0.7	1.76 ± 0.20	6.4 M_Jup	270	0.63

HD 109271	G5 V	56.0 ± 0.2	7.3 ± 1.2	17 ± 1 M_⊕	7.8543 ± 0.0009	0.25 ± 0.08
				24 ± 2 M_⊕	30.93 ± 0.02	0.15 ± 0.09
HIP 68468	G3 V	99.9 ± 0.7	6.4 ± 0.8	2.9 ± 0.8 M_⊕	1.8374 ± 0.0003	~0.41
				26 ± 4 M_⊕	194 ± 2	~0.04
HIP 107773	K1 III	105.5 ± 0.8	>1	1.98 ± 0.21 M_Jup	144.3 ± 0.5	0.09 ± 0.06

Notes. We give the spectral type of the primary star, the distance, and the estimated age of the system as well as masses, periods, and eccentricities of detected planetary companions.

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