Reference : The 12C2/12C13C isotopic ratio in comets C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR)
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/129998
The 12C2/12C13C isotopic ratio in comets C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR)
English
Rousselot, P. mailto [University of Franche-Comté, Observatoire des Sciences de l'Univers THETA, Institut UTINAM - UMR CNRS 6213, BP 1615, 25010, Besançon Cedex, France]
Jehin, Emmanuel mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Manfroid, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
1-Sep-2012
Astronomy and Astrophysics
EDP Sciences
545
24, pp. 1-7
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] line: identification ; comets: general ; comets: individual: C/2001 Q4 (NEAT) ; comets: individual: C/2002 T7 (LINEAR)
[en] Context. Measuring the carbon isotope abundance ratio in comets allows one to constrain the conditions in the outer protosolar nebula. Different measurements of the [SUP]12[/SUP]C/[SUP]13[/SUP]C ratio, using various molecules, have already been published for different solar system objects, such as the Sun, the Earth, the Moon, asteroids, planets, or comets. So far, all these measurements are consistent with [SUP]12[/SUP]C/[SUP]13[/SUP]C ~ 90, but significant differences have been observed. This ratio is remarkably constant in comets (91.0 ± 3.6) for studies based on the CN radical, but it presents stronger variations in studies based on other radicals. <BR /> Aims: This paper aims at measuring the [SUP]12[/SUP]C/[SUP]13[/SUP]C ratio in two bright Oort cloud comets using the [SUP]12[/SUP]C_2 and [SUP]12[/SUP]C[SUP]13[/SUP]C emission lines and an improved method. The ratios will be compared to those obtained for the same comets with another radical, CN. <BR /> Methods: We used the (2,1) and (1,0) bandheads of the [SUP]12[/SUP]C[SUP]13[/SUP]C, near 4723 and 4745 Å to measure the [SUP]12[/SUP]C/[SUP]13[/SUP]C ratio and compared their intensity to the [SUP]12[/SUP]C_2 lines of the same bands. We developed a model for interpreting observational data obtained at high resolution (~70 000) using the 8.2-m Kueyen telescope (UT2) of the Very Large Telescope (VLT) with the Ultraviolet and Visual Echelle Spectrograph (UVES) in two comets: C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR). <BR /> Results: Our modeling has provided [SUP]12[/SUP]C/[SUP]13[/SUP]C = 85 ± 20 for C/2002 T7 (LINEAR) and 80 ± 20 for C/2001 Q4 (NEAT). These values are compatible with previous measurements performed with the CN radical. Based on observations made with ESO Telescopes at the Paranal Observatory under programmes ID 073.C-0525.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/129998
10.1051/0004-6361/201219265
http://adsabs.harvard.edu/abs/2012A%26A...545A..24R

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