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A Search for N2+ in Spectra of Comet C/2002C1 (Ikeya-Zhang) | | Anita L. Cochran
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24 Aug 2002 | | Journal: | Astrophys.J. 576 (2002) L165-L168 | | Subject: | astro-ph | | Abstract: | We report low- and high-resolution spectra of comet C/2002 C1 (Ikeya-Zhang) from McDonald Observatory. The comet had a well-developed ion tail including CO+, CO2+, CH+, and H2O+. We used our high-resolution spectra to search for N2+. None was detected and we placed upper limits on N2+/CO+ of 5.4 times 10^{-4}. N2+ was detected in the low-resolution spectra but we show that this emission was probably telluric in origin (if cometary, we derive N2+/CO+ = 5.5 times 10^{-3}, still very low). We discuss the implications for the conditions in the early solar nebula of the non-detection of N2+. These depend on whether the H2O ice was deposited in the amorphous or crystalline form. If H2O was deposited in its crystalline form, the detection of CO+ but not N2+ has implications for H2O/H2 in the early solar nebula. | | Source: | arXiv, astro-ph/0208446 | | Services: | Forum | Review | PDF | Favorites | |
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