The SOPHIE search for northern extrasolar planets - XII. Three giant planets suitable for astrometric mass determination with Gaia

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Table 4

Data from Gaia DR1 and estimated values.

Target	α	Nmeas	Nmeas	S/N_{1 meas}	S/N_Nmeas	Astrometric excess noise	ΔQ
name	[μas]	DR1	end of mission			[mas]

HD 17674	27	32⁽¹⁾	101	0.8	8.0	0.33	3.04
HD 42012	83	5⁽¹⁾	66	2.4	19.5	0.28	−
HD 29021	201⁽²⁾	14⁽¹⁾	133	6.0	69.2	0.52	2.15

Notes. The number of Gaia observations is determined for each target using the Gaia Observation Forecast Tool. The S/N is calculated for one measurement, the measurements available in DR1, and the expected values at the end of the mission.

⁽¹⁾

Number of matched observations from the Gaia archive. Using the Forecast Tool, the expected number of observations were 35, 5 and 19 respectively.

⁽²⁾

The detectability of eccentric orbits will vary over the orbital phase, so the astrometric signal given for HD 29021 corresponds to apastron.

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