Periodic radial velocity variations in RU Lupi

Abstract

Context. RU Lup is a Classical T Tauri star with unusually strong emission lines, which has been interpreted as manifestations of accretion. Recently, evidence has accumulated that this star might have a variable radial velocity. Aims. We intended to investigate in more detail the possible variability in radial velocity using a set of 68 high-resolution spectra taken at the VLT (UVES), the AAT (UCLES) and the CTIO (echelle). Methods. Using standard cross-correlation techniques, we determined the radial velocity of RU Lup. We analysed these results with Phasedispersion minimization and the Lomb-Scargle periodogram and searched for possible periodicities in the obtained radial velocities. We also analysed changes in the absorption line shapes and the photometric variability of RU Lup. Results. Our analysis indicated that RU Lup exhibits variations in radial velocity with a periodicity of 3.71 days and an amplitude of 2.17 km/s. These variations can be explained by the presence of large spots, or groups of spots, on the surface of RU Lup. We also considered a low-mass companion and stellar pulsations as alternative sources for these variations but found these to be unlikely.

8 pages, 4 figures, Accepted by A&A

References in corpus (8)

• No planet for HD 166435
• The CORALIE survey for southern extra-solar planets IX. A 1.3-day period brown dwarf disguised as a planet
• Non-axisymmetric accretion on the classical TTS RW Aur A
• The loopy UV line profiles of RU Lupi: accretion, outflows, and fluorescence
• The CORALIE survey for southern extra-solar planets XI. The return of the giant planet orbiting HD192263
• Bisectors of the cross-correlation function applied to stellar spectra. Discriminating stellar activity, oscillations and planets
• Multi-Site observations of SU Aurigae
• The pre-main sequence spectroscopic binary UZ Tau East: improved orbital parameters and accretion phase dependence

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