Nearby young moving groups provide unique samples of similar age stars for testing the evolution of physical properties .
Incomplete and/or incorrect group membership classifications reduce the usefulness of the group , which we assume to be coeval .
With near-infrared spectra of two candidate members of the TW Hya Association , 2MASS J12354615 - 4115531 ( TWA 46 ) and 2MASS J12371238 - 4021480 ( TWA 47 ) , we test their membership by adding radial velocity measurements to the literature .
We find that 2MASS J12354615 - 4115531 is a close spectroscopic binary system with a center-of-mass radial velocity of -6.5 \pm 3.9 km s ^ { -1 } .
This radial velocity and a Gaia parallax produces a TWA membership probability of 41.9 \% using the Banyan \Sigma tool for 2MASS J12354615 - 4115531 .
The spectrum of 2MASS J12371238 - 4021480 shows that it appears to be a single star with a radial velocity consistent with the TW Hya Association and a membership probability of 99.5 \% .
The reduced probability of TWA 46 as a true member of TWA highlights the importance of high-resolution , near-infrared spectra in validating low-mass moving group members .