Temporal Variation of Chemical Composition of Comet C/2007 N3 (lulin) Observed in the Near-infrared Wavelength Region

Details Temporal Variation of Chemical Composition of Comet C/2007 N3 (lulin) Observed in the Near-infrared Wavelength Region Temporal Variation of Chemical Composition of Comet C/2007 N3 (lulin) Observed in the Near-infrared Wavelength Region

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.1508k&link_type=abstract

American Astronomical Society, DPS meeting #41, #15.08

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Scientific paper

Oort Cloud comet C/2007 N3 (Lulin) approached the Sun in February 2009. Its maximum brightness was about 4th magnitude in V-band. The high productivity of Lulin provided the opportunity to measure chemical composition and monitor the overall volatile productivity of the comet over time.
High dispersion near-infrared spectroscopic observations of C/2007 N3 (Lulin) were carried out in August 2008 and January through March 2009 by three different telescopes/instruments atop Mauna Kea, Hawaii: Subaru/IRCS, Keck II/NIRSPEC and IRTF/CSHELL. The spectral resolving powers are 10,000 for IRCS and 25,000 for both NIRSPEC and CSHELL. We present the composition of organic volatiles and the rotational and nuclear spin temperature of water in Lulin. We sampled H2O, OH, HCN, C2H2, NH3, CH4, C2H6, CO, CH3OH, and H2CO in our observations. The temporal coverage of our observations allowed a search for chemical heterogeneity within the nucleus of Lulin, and we discuss the absolute and relative production rates of these species with time and compare the chemistry of Lulin to other comets. The nuclear spin temperature of H2O will also be compared to derived values from other comets.

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