FUNDAMENTAL VIBRATIONAL TRANSITION OF CO DURING THE OUTBURST OF EX LUPI IN 2008

M. Goto*, Zs. Regaly, C. P. Dullemond, M. van den Ancker, J. M. Brown, A. Carmona, K. 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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 pages13
JournalAstrophysical Journal
Volume728
Issue number1
DOIs
Publication statusPublished - 10 Feb 2011

Keywords

  • 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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