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

M. Goto, Zs Regály, C. P. Dullemond, M. Van Den Ancker, J. M. Brown, A. Carmona, K. Pontoppidan, P. Ábrahám, G. A. Blake, D. Fedele, Th Henning, A. Juhász, A. Kóspál, L. Mosoni, A. Sicilia-Aguilar, H. Terada, R. Van Boekel, E. F. Van Dishoeck, T. Usuda

Research output: Article

4 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 μm. 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 μm, 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 υ = 1-0. The line widths translate to a characteristic orbiting radius of 0.4 AU. The broad-line component (FWZI ∼ 150 km s-1) is highly excited up to υ ≤ 6. The line flux of the component decreases faster than the narrow-line emission. Simple modeling of the line profiles implies that the broad-line emitting gas is orbiting around the star at 0.04-0.4 AU. The excitation state, the decay speed of the line flux, and the line profile indicate that the broad-line emission component is physically distinct from the narrow-line emission component, and more tightly related to the outburst event.

Original languageEnglish
JournalAstrophysical Journal
Volume728
Issue number1
DOIs
Publication statusPublished - febr. 10 2011

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outburst
telescopes
stars
T Tauri stars
decay
fading
profiles
plateaus
brightness
coverings
time measurement
plateau
continuums
radii
monitoring
gases
gas
modeling
excitation

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

Goto, M., Regály, Z., Dullemond, C. P., Van Den Ancker, M., Brown, J. M., Carmona, A., ... Usuda, T. (2011). Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008. Astrophysical Journal, 728(1). https://doi.org/10.1088/0004-637X/728/1/5

Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008. / Goto, M.; Regály, Zs; Dullemond, C. P.; Van Den Ancker, M.; Brown, J. M.; Carmona, A.; Pontoppidan, K.; Ábrahám, P.; Blake, G. A.; Fedele, D.; Henning, Th; Juhász, A.; Kóspál, A.; Mosoni, L.; Sicilia-Aguilar, A.; Terada, H.; Van Boekel, R.; Van Dishoeck, E. F.; Usuda, T.

In: Astrophysical Journal, Vol. 728, No. 1, 10.02.2011.

Research output: Article

Goto, M, Regály, Z, Dullemond, CP, Van Den Ancker, M, Brown, JM, Carmona, A, Pontoppidan, K, Ábrahám, P, Blake, GA, Fedele, D, Henning, T, Juhász, A, Kóspál, A, Mosoni, L, Sicilia-Aguilar, A, Terada, H, Van Boekel, R, Van Dishoeck, EF & Usuda, T 2011, 'Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008', Astrophysical Journal, vol. 728, no. 1. https://doi.org/10.1088/0004-637X/728/1/5
Goto M, Regály Z, Dullemond CP, Van Den Ancker M, Brown JM, Carmona A et al. Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008. Astrophysical Journal. 2011 febr. 10;728(1). https://doi.org/10.1088/0004-637X/728/1/5
Goto, M. ; Regály, Zs ; Dullemond, C. P. ; Van Den Ancker, M. ; Brown, J. M. ; Carmona, A. ; Pontoppidan, K. ; Ábrahám, P. ; Blake, G. A. ; Fedele, D. ; Henning, Th ; Juhász, A. ; Kóspál, A. ; Mosoni, L. ; Sicilia-Aguilar, A. ; Terada, H. ; Van Boekel, R. ; Van Dishoeck, E. F. ; Usuda, T. / Fundamental vibrational transition of CO during the outburst of EX Lupi in 2008. In: Astrophysical Journal. 2011 ; Vol. 728, No. 1.
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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 μm. 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 μm, 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 υ = 1-0. The line widths translate to a characteristic orbiting radius of 0.4 AU. The broad-line component (FWZI ∼ 150 km s-1) is highly excited up to υ ≤ 6. The line flux of the component decreases faster than the narrow-line emission. Simple modeling of the line profiles implies that the broad-line emitting gas is orbiting around the star at 0.04-0.4 AU. The excitation state, the decay speed of the line flux, and the line profile indicate that the broad-line emission component is physically distinct from the narrow-line emission component, and more tightly related to the outburst event.",
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AU - Brown, J. M.

AU - Carmona, A.

AU - Pontoppidan, K.

AU - Ábrahám, P.

AU - Blake, G. A.

AU - Fedele, D.

AU - Henning, Th

AU - Juhász, A.

AU - Kóspál, A.

AU - Mosoni, L.

AU - Sicilia-Aguilar, A.

AU - Terada, H.

AU - Van Boekel, R.

AU - Van Dishoeck, E. F.

AU - Usuda, T.

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N2 - 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 μm. 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 μm, 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 υ = 1-0. The line widths translate to a characteristic orbiting radius of 0.4 AU. The broad-line component (FWZI ∼ 150 km s-1) is highly excited up to υ ≤ 6. The line flux of the component decreases faster than the narrow-line emission. Simple modeling of the line profiles implies that the broad-line emitting gas is orbiting around the star at 0.04-0.4 AU. The excitation state, the decay speed of the line flux, and the line profile indicate that the broad-line emission component is physically distinct from the narrow-line emission component, and more tightly related to the outburst event.

AB - 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 μm. 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 μm, 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 υ = 1-0. The line widths translate to a characteristic orbiting radius of 0.4 AU. The broad-line component (FWZI ∼ 150 km s-1) is highly excited up to υ ≤ 6. The line flux of the component decreases faster than the narrow-line emission. Simple modeling of the line profiles implies that the broad-line emitting gas is orbiting around the star at 0.04-0.4 AU. The excitation state, the decay speed of the line flux, and the line profile indicate that the broad-line emission component is physically distinct from the narrow-line emission component, and more tightly related to the outburst event.

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KW - Stars: pre-main sequence

KW - Stars: variables: T Tauri

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