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A Search For 15NH2 Lines In Comet C/2002 T7 (LINEAR)

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Presentation Abstract, 44th DPS meeting

Published in BAAS, Volume 44 #5 (2012), 314.14

Title A Search For 15NH2 Lines In Comet C/2002 T7 (LINEAR) Author

Block Philippe Rousselot

1, O. Pirali2, E. Jehin3, M. Vervloet2, D. Hutsemékers3, J. Manfroid3, M. Martin-Drumel2, S. Gruet2, M. Lobanova1

1Obs. de Besancon, UTINAM UMR 6213 CNRS, France, 2Synchrotron SOLEIL, ligne AILES, UMR 8214 CNRS, France, 3Institut d’Astrophysique et de

Geophysique, Belgium.

Abstract The determination of isotopic ratios in comets is of primary importance for a good understanding of their origin and the formation of solar system. The 14N/15N ratio is an interesting tracer, because of its variability among various solar system bodies. So far it has only been measured in bright comets through optical observations of the CN radical (Arpigny et al., 2003; Manfroid et al., 2009) and millimeter observations of HCN (Bockelée-Morvan et al., 2005, 2008). The measurements give for both species the same non-terrestrial isotopic composition (14N/15N≈150 in comets versus 272 in the Earth atmosphere), but HCN and CN are minor species. In order to get a

determination of this ratio in another molecule we have searched for 15NH2 lines in a high-resolution and high signal-to-noise ratio spectrum of comet C/2002 T7 (LINEAR) obtained with the UVES spectrometer at the VLT ESO 8-m telescope (Hutsemékers et al., 2008). This work is based on a new laboratory experiment conducted with the AILES beamline spectrometer at synchrotron SOLEIL to determine the 15NH2 wavelengths by Fourier transform

spectroscopy. We will present the first results obtained from these data, which have allowed to search for the first time 15NH2 emission lines in a comet. References: Arpigny et al., 2003, Science, 301, 1522 Bockelée-Morvan et al.,2005, in Comets II, ed. M. C. Festou, H. U. Keller, & H. A. Weaver (Tucson: Univ. Arizona Press), 391 Bockelée-Morvan et al., 2008, ApJ, 679, L49

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