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Table 7:

Properties of the confirmed comoving substellar companions discovered in the young, nearby associations: TW Hydrae (TWA), $\beta $ Pictoris ($\beta $ Pic), Columba (Col) and Carina (Car).
Name Grp Age d SpT$_{\rm A}$ SpT$_{\rm B}$ $M_{\rm B}$ $T^B_{\rm {eff}}$ $q_{\rm B/A}$ $\Delta_{\rm proj}$
    (Myr) (pc)     ( $M_{\rm {Jup}}$) (K)   (AU)
TWA5 TWA 8 (45-50) M1.5 M8.5 $25\pm5$ $2500\pm150$ 0.055 $93\pm10$
HR7329 $\beta $ Pic 12 $\rm 48.2^{+1.8}_{-1.6}$ A0V M8 $25\pm5$ $2550\pm150$ 0.010 $199\pm10$
GSC-08047-00232 Tuc-Hor/Col 30 (85-95) K3V $M9^{\rm +1}_{-3}$ $20\pm5$ $2100\pm200$ 0.025 $295\pm30$
AB Pic Tuc-Hor/Car 30 $\rm 46.0^{+1.6}_{-1.5}$ K2V $L1^{\rm +2}_{-1}$ $13\pm2$ $1700\pm200$ 0.015 $250\pm10$
2M1207 TWA 8 $\rm 52.4^{+1.1}_{-1.1}$ M8 late-L $4\pm1^*$ $1150\pm150^*$ 0.16* $40\pm2$

- (*): For 2M1207 b, Mohanty et al. (2007) suggest a higher mass of $8\pm2~M_{\rm {Jup}}$ and the existence of a circum-secondary edge-on disk to explain their measured effective spectroscopic temperature of $1600\pm100$ K. (See discussion in Sect. 5.3.3.)


Source LaTeX | All tables | In the text

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