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Molecular Outgassin...
Molecular Outgassing in Centaur 29P/Schwassmann-Wachmann 1 during Its Exceptional 2021 Outburst: Coordinated Multiwavelength Observations Using nFLASH at APEX and iSHELL at the NASA-IRTF
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- Roth, Nathan X. (author)
- NASA Goddard Space Flight Center,University of Hawaii,Catholic University of America
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- Milam, S.N. (author)
- NASA Goddard Space Flight Center
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- DiSanti, Michael A. (author)
- NASA Goddard Space Flight Center
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- Villanueva, Geronimo L. (author)
- NASA Goddard Space Flight Center
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- Faggi, Sara (author)
- American University,NASA Goddard Space Flight Center
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- Bonev, B. P. (author)
- American University
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- Cordiner, Martin A. (author)
- NASA Goddard Space Flight Center,Catholic University of America
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- Remijan, A. J. (author)
- National Radio Astronomy Observatory
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Bockelée-Morvan, D. (author)
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Biver, N. (author)
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Crovisier, J. (author)
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- Lis, Dariusz C. (author)
- California Institute of Technology (Caltech)
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- Charnley, Steven B. (author)
- NASA Goddard Space Flight Center
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- Jehin, Emmanuel (author)
- Universite de Liège,University of Liège
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- Wirström, Eva, 1977 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- McKay, Adam J. (author)
- Appalachian State University
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Planetary Science Journal. - 2632-3338. ; 4:9
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https://research.cha...
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https://doi.org/10.3...
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Abstract
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- The extraordinary 2021 September-October outburst of Centaur 29P/Schwassmann-Wachmann 1 afforded an opportunity to test the composition of primitive Kuiper disk material at high sensitivity. We conducted nearly simultaneous multiwavelength spectroscopic observations of 29P/Schwassmann-Wachmann 1 using iSHELL at the NASA Infrared Telescope Facility (IRTF) and nFLASH at the Atacama Pathfinder EXperiment (APEX) on 2021 October 6, with follow-up APEX/nFLASH observations on 2021 October 7 and 2022 April 3. This coordinated campaign between near-infrared and radio wavelengths enabled us to sample molecular emission from a wealth of coma molecules and to perform measurements that cannot be accomplished at either wavelength alone. We securely detected CO emission on all dates with both facilities, including velocity-resolved spectra of the CO (J = 2-1) transition with APEX/nFLASH and multiple CO (v = 1-0) rovibrational transitions with IRTF/iSHELL. We report rotational temperatures, coma kinematics, and production rates for CO and stringent (3σ) upper limits on abundance ratios relative to CO for CH4, C2H6, CH3OH, H2CO, CS, and OCS. Our upper limits for CS/CO and OCS/CO represent their first values in the literature for this Centaur. Upper limits for CH4, C2H6, CH3OH, and H2CO are the most stringent reported to date, and are most similar to values found in ultra CO-rich Oort cloud comet C/2016 R2 (PanSTARRS), which may have implications for how ices are preserved in cometary nuclei. We demonstrate the superb synergy of coordinated radio and near-infrared measurements, and advocate for future small-body studies that jointly leverage the capabilities of each wavelength.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Comae
- Astrophysics - Earth and Planetary Astrophysics
- Centaur group
- 1338
- High resolution spectroscopy
- 271
- Radio astronomy
- Molecular spectroscopy
- 215
- Comets
- 1093
- Near infrared astronomy
- 280
- 2095
- 2096
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Roth, Nathan X.
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Milam, S.N.
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DiSanti, Michael ...
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Villanueva, Gero ...
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Faggi, Sara
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Bonev, B. P.
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Cordiner, Martin ...
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Remijan, A. J.
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Bockelée-Morvan, ...
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Biver, N.
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Crovisier, J.
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Lis, Dariusz C.
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Charnley, Steven ...
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Jehin, Emmanuel
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Wirström, Eva, 1 ...
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McKay, Adam J.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Planetary Scienc ...
- By the university
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Chalmers University of Technology