\begin{table}%t1
\caption{\label{table:1}Orbital parameters of the Gl 581 planetary system, from Udry et~al. (\cite{Udry07}).  $M_{\rm min} = M \sin i$, where $i$~is the orbital inclination.}
%\centering
\small         
\begin{tabular}{l l l l l  }     
\hline\hline
Star & $M/M_{\odot}$ & $T_{\rm eff}$ & $R/R_{\odot}$ & $L/L_{\odot}$ \\ 
\hline
   Gl 581 & 0.31 & 3200 & 0.38 & 0.135 \\  
\hline
Planet & $M_{\rm min}/M_{\oplus}$ & $a$ (AU) & Eccentricity & Period (days) \\
\hline
b & 15.6 & 0.0406 & 0.02 & 5.37 \\
c & 5.05 & 0.0730 & 0.16 & 12.9 \\
d & 8.36 & 0.253 & 0.2  & 83.4 \\
\hline                  
\end{tabular}
\end{table}