التفاصيل البيبلوغرافية
| العنوان: |
THE VOLATILE COMPOSITION OF COMET C/2003 K4 (LINEAR) AT NEAR-IR WAVELENGTHS—COMPARISONS WITH RESULTS FROM THE NANÇAY RADIO TELESCOPE AND FROM THE ODIN, SPITZER, AND SOHO SPACE OBSERVATORIES. |
| المؤلفون: |
L. Paganini, M. J. Mumma, G. L. Villanueva, M. A. DiSanti, B. P. Bonev |
| المصدر: |
Astrophysical Journal; 7/20/2015, Vol. 808 Issue 1, p1-1, 1p |
| مصطلحات موضوعية: |
COMETS spectra, VOLATILE organic compounds, TRACE elements, INTERSTELLAR gases, WATER research, OORT Cloud |
| مستخلص: |
We observed comet C/2003 K4 (LINEAR) using NIRSPEC at the Keck Observatory on UT 2004 November 28, when the comet was at 1.28 AU from the Sun (post-perihelion) and 1.38 AU from Earth. We detected six gaseous species (H2O, OH*, C2H6, CH3OH, CH4, and HCN) and obtained upper limits for three others (H2CO, C2H2, and NH3). Our results indicate a water production rate of (1.72 ± 0.18) × 1029 molecules s−1, in reasonable agreement with production rates from SOHO (on the same day), Odin (one day earlier), and Nançay (about two weeks earlier). We also report abundances (relative to water) for seven trace species: CH3OH (∼1.8%), CH4 (∼0.9%), and C2H6 (∼0.4%) that were consistent with mean values among Oort cloud (OC) comets, while NH3 (<0.55%), HCN (∼0.07%), H2CO (<0.07%), and C2H2 (<0.04%) were “lower” than the mean values in other OC comets. We extracted inner-coma rotational temperatures for four species (H2O, C2H6, CH3OH, and CH4), all of which are consistent with 70 K (within 1σ). The extracted ortho-para ratio for water was 3.0 ± 0.15, corresponding to spin temperatures larger than 39 K (at the 1σ level) and agreeing with those obtained with the Spitzer Space Telescope at the 2σ level. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
