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In searches for low-mass companions to late-type stars, correlation betweenradial velocity variations and line bisector slope changes indicatescontamination by large starspots. Two young stars demonstrate that this test isnot sufficient to rule out starspots as a cause of radial velocity variations.As part of our survey for substellar companions to T Tauri stars, we identifiedthe ~2 Myr old planet host candidates DN Tau and V836 Tau. In both cases,visible light radial velocity modulation appears periodic and is uncorrelatedwith line bisector span variations, suggesting close companions of severalM_Jup in these systems. However, high-resolution, infrared spectroscopy showsthat starspots cause the radial velocity variations. We also report unambiguousresults for V827 Tau, identified as a spotted star on the basis of both visiblelight and infrared spectroscopy. Our results suggest that infrared follow upobservations are critical for determining the source of radial velocitymodulation in young, spotted stars.

A Young Planet Search in Visible and IR Light: DN Tau, V836 Tau, and V827 Tau