The HARPS search for southern extra-solar planets - XXVI. Two giant planets around M0 dwarfs

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Table 1

Observed and inferred stellar parameters for Gl 676A and HIP 12961.

Parameter		Gl 676A	HIP 12961	Notes

Spectral Type		M0V	M0V	^a
V		9.585 ± 0.006	10.31 ± 0.04	^b
J		6.711 ± 0.020	7.558 ± 0.021	^c
K _s		5.825 ± 0.029	6.736 ± 0.018	^c
BC_{K_s}		2.73	2.61	^d
π	[mas]	60.79 ± 1.62	43.45 ± 1.72	^e
Distance	[pc]	16.45 ± 0.44	23.01 ± 0.91
M _V		8.50 ± 0.06	8.50 ± 0.09
M _{K _s}		4.74 ± 0.06	4.93 ± 0.09
M _bol		7.47	7.54
L _⋆	[L_⊙]	0.082	0.076
vsini	[km s^-1]	1.6 ± 1.0	1.5 ± 1.0
[Fe/H]		0.18	−0.07	^f
M _⋆	[M_⊙]	0.71	0.67	^g

Notes.

^(a)

Hawley et al. (1996) for Gl 676A, and Luyten (1980) for HIP 12961;

^(b)

Koen et al. (2002) for Gl 676A, and computed from the TYCHO (B_T,V_T) photometry for HIP 12961;

^(c)

Skrutskie et al. (2006);

^(d)

computed from J − K_s with the Leggett et al. (2001) BC_{K_s} vs. J − K_s relation;

^(e)

van Leeuwen (2007);

^(f)

computed from M_{K_s} and V − K_s using the Schlaufman & Laughlin (2010) calibration;

^(g)

computed from M_{K_s} using the Delfosse et al. (2000) calibration; both masses are at the upper edge of the validity range of that calibration, and they might therefore have somewhat larger errors than its 10% dispersion.

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