Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008

M. Goto (Lead / Corresponding author), Zs. Regaly, C. P. Dullemond, M. van den Ancker, J. M. Brown, A. Carmona, K. M. Pontoppidan, P. Abraham, G. A. Blake, D. Fedele, Th. Henning, A. Juhasz, A. Kospal, L. Mosoni, A. Sicilia-Aguilar, H. Terada, R. Van Boekel, E. F. van Dishoeck, T. Usuda

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We report monitoring observations of the T Tauri star EX Lupi during its outburst in 2008 in the CO fundamental band at 4.6-5.0 mu m. The observations were carried out at the Very Large Telescope and the Subaru Telescope at six epochs from 2008 April to August, covering the plateau of the outburst and the fading phase to a quiescent state. The line flux of CO emission declines with the visual brightness of the star and the continuum flux at 5 mu m, but composed of two subcomponents that decay with different rates. The narrow-line emission (50 km s(-1) in FWHM) is near the systemic velocity of EX Lupi. These emission lines appear exclusively in v = 1-0. The line widths translate to a characteristic orbiting radius of 0.4 AU. The broad-line component (FWZI similar to 150 km s(-1)) is highly excited up to v
Original languageEnglish
Article number5
Number of pages5
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 13 Jan 2011


  • circumstellar matter protoplanetary disks stars: formation stars: individual (EX Lupi) stars: pre-main sequence stars: variables: T Tauri, Herbig Ae/Be LAYERED PROTOPLANETARY DISCS FU-ORIONIS STARS T-TAURI-STARS NEAR-INFRARED SPECTROSCOPY ACCRETION DISK 2-DIMENSIONAL MODELS EPISODIC ACCRETION V1647 ORIONIS EVOLUTION EMISSION


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