TY - JOUR
T1 - Carbonyl Sulfide in Comets C/1996 B2 (Hyakutake) and C/1995 O1 (Hale-Bopp)
T2 - Evidence for an Extended Source in Hale-Bopp
AU - Dello Russo, Neil
AU - Disanti, Michael A.
AU - Mumma, Michael J.
AU - Magee-Sauer, Karen
AU - Rettig, Terrence W.
N1 - Funding Information:
This work was supported by the NASA Planetary Astronomy Program under RTOP 344-32-03 to M. J. Mumma. We thank D. Schleicher for helpful comments which improved the manuscript. We thank T. Reyes for assistance with figure production. We are grateful for the outstanding support form the staff of the NASA Infrared Telescope Facility. The NASA IRTF is operated by the University of Hawaii under contract to NASA.
PY - 1998/10
Y1 - 1998/10
N2 - Carbonyl sulfide was detected in Comet Hale-Bopp (C/1995 O1) using high dispersion infrared spectroscopy at the NASA Infrared Telescope Facility on Mauna Kea, Hawaii. Six lines (P10, P11, P12, P14, P15, and P17) of the ν3fundamental band near 4.85 μm were detected on UT April 16.0, April 30.0, and May 1.2, 1997, and two additional lines (P18 and P22) were detected on April 30.0. Water was detected directly through emission lines of its ν1-ν2hot band on UT April 16.0, April 30.0, and May 1.2, with a rotational temperature of 93 ± 16 K on May 1.2. Adopting a rotational temperature of 100 K for OCS, our derived production rates are (3.80 ± 0.67) and (1.77 ± 0.85) × 1028molecules s-1on April 16.0 and May 1.2, respectively. The measured production rates imply mixing ratios (QOCSQH2O) of (4.58 ± 0.77) and (2.76 ± 1.34) × 10-3on April 16.0 and May 1.2, respectively. Comparison of spatial profiles for OCS, H2O, and the dust continuum derived from spectra taken less than 1 h apart suggests that on April 16.0 a significant amount of OCS (~70% of the total) was released as an extended source. On April 30.0 and May 1.2 the quality of the data prevent a firm conclusion regarding an extended source contribution. If the nature of the OCS source did not change between April 16.0 and May 1.2, the weighted mean mixing ratio is (4.13 ± 0.77) × 10-3. We searched for lines P1 through P8 of the ν3band of OCS in Comet Hyakutake (C/1996 B2) on UT March 24.5, 1996. Our upper limit (3σ) for the OCS production rate in Hyakutake is 1.0 × 1027molecules s-1(QOCS/QH2O< 5.3 × 10-3).
AB - Carbonyl sulfide was detected in Comet Hale-Bopp (C/1995 O1) using high dispersion infrared spectroscopy at the NASA Infrared Telescope Facility on Mauna Kea, Hawaii. Six lines (P10, P11, P12, P14, P15, and P17) of the ν3fundamental band near 4.85 μm were detected on UT April 16.0, April 30.0, and May 1.2, 1997, and two additional lines (P18 and P22) were detected on April 30.0. Water was detected directly through emission lines of its ν1-ν2hot band on UT April 16.0, April 30.0, and May 1.2, with a rotational temperature of 93 ± 16 K on May 1.2. Adopting a rotational temperature of 100 K for OCS, our derived production rates are (3.80 ± 0.67) and (1.77 ± 0.85) × 1028molecules s-1on April 16.0 and May 1.2, respectively. The measured production rates imply mixing ratios (QOCSQH2O) of (4.58 ± 0.77) and (2.76 ± 1.34) × 10-3on April 16.0 and May 1.2, respectively. Comparison of spatial profiles for OCS, H2O, and the dust continuum derived from spectra taken less than 1 h apart suggests that on April 16.0 a significant amount of OCS (~70% of the total) was released as an extended source. On April 30.0 and May 1.2 the quality of the data prevent a firm conclusion regarding an extended source contribution. If the nature of the OCS source did not change between April 16.0 and May 1.2, the weighted mean mixing ratio is (4.13 ± 0.77) × 10-3. We searched for lines P1 through P8 of the ν3band of OCS in Comet Hyakutake (C/1996 B2) on UT March 24.5, 1996. Our upper limit (3σ) for the OCS production rate in Hyakutake is 1.0 × 1027molecules s-1(QOCS/QH2O< 5.3 × 10-3).
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U2 - 10.1006/icar.1998.5990
DO - 10.1006/icar.1998.5990
M3 - Article
AN - SCOPUS:0040428204
SN - 0019-1035
VL - 135
SP - 377
EP - 388
JO - Icarus
JF - Icarus
IS - 2
ER -