Post-perihelion volatile production and release from Jupiter-family comet 45P/Honda-Mrkos-Pajdušáková

Russo, N. Dello; Kawakita, Hideyo; Bonev, B. P.; Vervack, R. J.; Gibb, E. L.; Shinnaka, Yoshiharu; Roth, Nathan X.; DiSanti, M. A.; McKay, Adam

doi:10.1016/j.icarus.2019.113411

Cited by 19 publications

(7 citation statements)

References 53 publications

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“…However, as noted above, the statistics for CH

in JFCs are far from robust. Recent years have provided several rare and favorable opportunities to observe CH

in JFCs [ 52 , 110 , 111 , 112 , 113 , 114 ], providing a much needed boost towards establishing a statistically significant sample of CH

measurements in JFCs. However, it is still much smaller than the OCC sample, making comparisons between the two classes more difficult.…”

Section: Results For Specific Speciesmentioning

confidence: 99%

Organic Matter in Cometary Environments

McKay

Roth

2021

Life

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Comets contain primitive material leftover from the formation of the Solar System, making studies of their composition important for understanding the formation of volatile material in the early Solar System. This includes organic molecules, which, for the purpose of this review, we define as compounds with C–H and/or C–C bonds. In this review, we discuss the history and recent breakthroughs of the study of organic matter in comets, from simple organic molecules and photodissociation fragments to large macromolecular structures. We summarize results both from Earth-based studies as well as spacecraft missions to comets, highlighted by the Rosetta mission, which orbited comet 67P/Churyumov–Gerasimenko for two years, providing unprecedented insights into the nature of comets. We conclude with future prospects for the study of organic matter in comets.

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“…However, as noted above, the statistics for CH

in JFCs are far from robust. Recent years have provided several rare and favorable opportunities to observe CH

in JFCs [ 52 , 110 , 111 , 112 , 113 , 114 ], providing a much needed boost towards establishing a statistically significant sample of CH

measurements in JFCs. However, it is still much smaller than the OCC sample, making comparisons between the two classes more difficult.…”

Section: Results For Specific Speciesmentioning

confidence: 99%

Organic Matter in Cometary Environments

McKay

Roth

2021

Life

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“…This could explain why the water production rate of Combi et al (2020b) is higher than ours. Dello Russo et al (2020) studied water directly in the infrared. They had a similarly narrow slit to our observations and thus should have a similar water production rate to our value based on the above discussion.…”

Section: Discussionmentioning

confidence: 99%

Inferring the CO₂ Abundance in Comet 45P/Honda-Mrkos-Pajdušáková from [O i] Observations: Implications for the Source of Icy Grains in Cometary Comae

Huffman,

McKay,

Cochran

2024

Planet. Sci. J.

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The study of cometary composition is important for understanding our solar system's early evolutionary processes. Carbon dioxide (CO2) is a common hypervolatile in comets that can drive activity but is more difficult to study than other hypervolatiles owing to severe telluric absorption. CO2 can only be directly observed from space-borne assets. Therefore, a proxy is needed to measure CO2 abundances in comets using ground-based observations. The flux ratio of the [O i] λ5577 line to the sum of the [O i] λ6300 and [O i] λ6364 lines (hereafter referred to as the [O i] line ratio) has, with some success, been used in the past as such a proxy. We present an [O i] line ratio analysis of comet 45P/Honda-Mrkos-Pajdušáková (HMP), using data obtained with the Tull Coudé Spectrograph on the 2.7 m Harlan J. Smith Telescope at McDonald Observatory, taken from UT 2017 February 21–23, when the comet was at heliocentric distances of 1.12–1.15 au. HMP is a hyperactive Jupiter-family comet (JFC). Icy grains driven out by CO2 sublimation have been proposed as a driver of hyperactivity, but the CO2 abundance of HMP has not been measured. From our [O i] line ratio measurements, we find a CO2/H2O ratio for HMP of 22.9% ± 1.4%. We compare the CO2/H2O ratios to the active fractions of the nine comets (including HMP) in the literature that have data for both values. We find no correlation. These findings imply that CO2 sublimation driving out icy grains is not the only factor influencing active fractions for cometary nuclei.

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“…This quantity is not measured directly from our observations since the spectral resolving power of our observation (∼4.2 × 10 4 ) corresponds to a velocity resolution of ∼7 km s −1 and is thus insufficient to resolve spectral lines and hence gas outflow velocities. This assumption of the canonical value of v gas introduces a systematic uncertainty in the production rates; however, this has a negligible effect on our derived abundance ratios (Dello Russo et al 2020).…”

Section: Molecular Production Ratesmentioning

confidence: 99%

“…As a result, production rates derived from nucleuscentered extracts are underestimated. A multiplicative correction factor known as the growth factor (GF) is applied to the Q nc (e.g., Dello Russo et al 1998Russo et al , 2020DiSanti et al 2001) to compensate for these effects. Thus, the total production rate, Q tot , is given by Q tot = (Q nc )(GF).…”

Section: Molecular Production Ratesmentioning

confidence: 99%

“…Studies of coma molecular emission intensity along the slit (spatial profiles) can provide information on the association of volatiles in the comet nucleus and how they are released into the coma (Dello Russo et al 2004Russo et al , 2020. Comparing profiles of co-measured volatiles and dust provides information regarding the release and outflow of material in the coma (e.g., Dello Russo et al 2004).…”

Section: Spatial Profilesmentioning

confidence: 99%

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Coma Abundances of Volatiles at Small Heliocentric Distances: Compositional Measurements of Long-period Comet C/2020 S3 (Erasmus)

Ejeta,

Gibb,

Roth

et al. 2023

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We report production rates of H2O and nine trace molecules (C2H6, CH4, H2CO, CH3OH, HCN, NH3, C2H2, OCS, and CO) in long-period comet C/2020 S3 (Erasmus) using the high-resolution, cross-dispersed infrared spectrograph (iSHELL) at the NASA Infrared Telescope Facility, on two pre-perihelion dates at heliocentric distances R h = 0.49 and 0.52 au. Our molecular abundances with respect to simultaneously or contemporaneously measured H2O indicate that S3 is depleted in CH3OH compared to its mean abundance relative to H2O among the overall comet population (Oort Cloud comets and Jupiter-family comets combined), whereas the eight other measured species have near-average abundances relative to H2O. In addition, compared to comets observed at R h < 0.80 au at near-infrared wavelengths, S3 showed enhancement in the abundances of volatile species H2CO, NH3, and C2H2, indicating possible additional (distributed) sources in the coma for these volatile species. The spatial profiles of volatile species in S3 in different instrumental settings are dramatically different, which might suggest temporal variability in comet outgassing behavior between the nonsimultaneous measurements. The spatial distributions of simultaneously measured volatile species C2H6 and CH4 are nearly symmetric and closely track each other, while those of CO and HCN co-measured with H2O (using different instrument settings) are similar to each other and are asymmetric in the antisunward direction.

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Post-perihelion volatile production and release from Jupiter-family comet 45P/Honda-Mrkos-Pajdušáková

Cited by 19 publications

References 53 publications

Organic Matter in Cometary Environments

Organic Matter in Cometary Environments

Inferring the CO₂ Abundance in Comet 45P/Honda-Mrkos-Pajdušáková from [O i] Observations: Implications for the Source of Icy Grains in Cometary Comae

Coma Abundances of Volatiles at Small Heliocentric Distances: Compositional Measurements of Long-period Comet C/2020 S3 (Erasmus)

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Post-perihelion volatile production and release from Jupiter-family comet 45P/Honda-Mrkos-Pajdušáková

Cited by 19 publications

References 53 publications

Organic Matter in Cometary Environments

Organic Matter in Cometary Environments

Inferring the CO2 Abundance in Comet 45P/Honda-Mrkos-Pajdušáková from [O i] Observations: Implications for the Source of Icy Grains in Cometary Comae

Coma Abundances of Volatiles at Small Heliocentric Distances: Compositional Measurements of Long-period Comet C/2020 S3 (Erasmus)

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Inferring the CO₂ Abundance in Comet 45P/Honda-Mrkos-Pajdušáková from [O i] Observations: Implications for the Source of Icy Grains in Cometary Comae