Sciences and Exploration Directorate

Steven B Charnley


Steven B Charnley's Contact Card & Information.
Phone: 301.286.9706
Org Code: 691
Mail Code 691
Greenbelt, MD 20771

Missions & Projects

Selected Publications


2023. "Author's Reply to Comment by Greaves et al. on “Phosphine in the Venusian Atmosphere: A Strict Upper Limit From SOFIA GREAT Observations”." Geophysical Research Letters 50 (23): [10.1029/2023gl106136] [Journal Article/Letter]

2023. "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." The Planetary Science Journal 4 (9): 172 [10.3847/psj/ace1e9] [Journal Article/Letter]

2023. "Gas Sources from the Coma and Nucleus of Comet 46P/Wirtanen Observed Using ALMA." The Astrophysical Journal 953 (1): 59 [10.3847/1538-4357/ace0bc] [Journal Article/Letter]

2022. "Variability in Titan’s Mesospheric HCN and Temperature Structure as Observed by ALMA." The Planetary Science Journal 3 (6): 146 [10.3847/psj/ac7050] [Journal Article/Letter]

2021. "Leveraging the ALMA Atacama Compact Array for Cometary Science: An Interferometric Survey of Comet C/2015 ER61 (PanSTARRS) and Evidence for a Distributed Source of Carbon Monosulfide." ApJ 921 14 [] [Journal Article/Letter]

2021. "No evidence of phosphine in the atmosphere of Venus from independent analyses." Nature Astronomy 5 (7): 631-635 [10.1038/s41550-021-01422-z] [Journal Article/Letter]

2021. "New Bistable Solutions in Molecular Cloud Chemistry: Nitrogen and Carbon Autocatalysis." The Astrophysical Journal 909 (2): 171 [10.3847/1538-4357/abe1c6] [Journal Article/Letter]

2020. "Detection of Dynamical Instability in Titan’s Thermospheric Jet." The Astrophysical Journal 904 (1): L12 [10.3847/2041-8213/abc688] [Journal Article/Letter]

2020. "Detection of CH3C3N in Titan’s Atmosphere." The Astrophysical Journal 903 (1): L22 [10.3847/2041-8213/abc1e1] [Journal Article/Letter]

2020. "Detection of Cyclopropenylidene on Titan with ALMA." The Astronomical Journal 160 205 [10.3847/1538-3881/abb679] [Journal Article/Letter]

2020. "Detection of CH3C3N in Titan's Atmosphere." The Astrophysical Journal Letters [Journal Article/Letter]

2020. "Propionitrile in the two lowest excited vibrational states in the laboratory and on Titan." Journal of Molecular Spectroscopy 372 111324 [10.1016/j.jms.2020.111324] [Journal Article/Letter]

2019. "Astrochemical Bistability: Autocatalysis in Oxygen Chemistry." The Astrophysical Journal 887 (1): 67 [10.3847/1538-4357/ab4e9c] [Journal Article/Letter]

2019. "Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds." ACS Earth and Space Chemistry 3 (10): 2088-2109 [10.1021/acsearthspacechem.9b00065] [Journal Article/Letter]

2019. "ALMA Spectral Imaging of Titan Contemporaneous with Cassini's Grand Finale." The Astronomical Journal 158 (2): 76 [10.3847/1538-3881/ab2d20] [Journal Article/Letter]

2019. "Measurement of CH3D on Titan at Submillimeter Wavelengths." The Astronomical Journal 157 (6): 219 [10.3847/1538-3881/ab19bb] [Journal Article/Letter]

2019. "Confirming Interstellar C60 + Using the Hubble Space Telescope." The Astrophysical Journal 875 (2): L28 [10.3847/2041-8213/ab14e5] [Journal Article/Letter]

2019. "Abundance measurements of Titan’s stratospheric HCN, HC3N, C3H4, and CH3CN from ALMA observations." Icarus 319 417-432 [10.1016/j.icarus.2018.09.023] [Journal Article/Letter]

2018. "Spatial variations in Titan’s atmospheric temperature: ALMA and Cassini comparisons from 2012 to 2015." Icarus 307 380-390 [10.1016/j.icarus.2017.10.042] [Journal Article/Letter]

2018. "The Origin of Titan’s External Oxygen: Further Constraints from ALMA Upper Limits on CS and CH2NH." The Astronomical Journal 155 (6): 251 [10.3847/1538-3881/aac172] [Journal Article/Letter]

2018. "Interferometric Imaging of Titan’s HC3N, H13CCCN, and HCCC15N." The Astrophysical Journal 859 (1): L15 [10.3847/2041-8213/aac38d] [Journal Article/Letter]

2018. "The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud." Astrophysical Journal Letters 853 (2): L19 [10.3847/2041-8213/aaa079] [Journal Article/Letter]

2017. "Very Large Array Ammonia Observations of the HH 111/HH 121 Protostellar System: A Detection of a New Source with a Peculiar Chemistry." The Astrophysical Journal 849 (1): 68 [10.3847/1538-4357/aa8b18] [Journal Article/Letter]

2017. "Mapping Vinyl Cyanide and Other Nitriles in Titan's Atmosphere Using ALMA." The Astronomical Journal 154 206 [10.3847/1538-3881/aa8eef] [Journal Article/Letter]

2017. "Measuring molecular abundances in comet C/2014 Q2 (Lovejoy) using the APEX telescope." Monthly Notices of the Royal Astronomical Society 474 (1): 1099-1107 [10.1093/mnras/stx2802] [Journal Article/Letter]

2017. "ALMA detection and astrobiological potential of vinyl cyanide on Titan." Science Advances 3 e1700022 [10.1126/sciadv.1700022] [Journal Article/Letter]

2017. "Searching for Interstellar C60+ Using a New Method for High Signal-to-noise HST/STIS Spectroscopy." The Astrophysical Journal 843 (1): L2 [10.3847/2041-8213/aa78f7] [Journal Article/Letter]

2017. "ALMA Mapping of Rapid Gas and Dust Variations in Comet C/2012 S1 (ISON):New Insights into the Origin of Cometary HNC." The Astrophysical Journal 838 (2): 147 [10.3847/1538-4357/aa6590] [Journal Article/Letter]

2017. "JCMT Spectral and Continuum Imaging of Comet 252P/LINEAR." The Astronomical Journal 153 (4): 169 [10.3847/1538-3881/aa6440] [Journal Article/Letter]

2017. "Thermal Physics of the Inner Coma: ALMA Studies of the Methanol Distribution and Excitation in Comet C/2012 K1 (PanSTARRS)." The Astrophysical Journal 837 (2): 177 [10.3847/1538-4357/aa6211] [Journal Article/Letter]

2017. "Pathways to Meteoritic Glycine and Methylamine." ACS Earth and Space Chemistry 1 (1): 3-13 [Full Text] [10.1021/acsearthspacechem.6b00014] [Journal Article/Letter]

2017. "EXTERNALLY HEATED PROTOSTELLAR CORES IN THE OPHIUCHUS STAR-FORMING REGION." The Astrophysical Journal 835 (1): 3 [10.3847/1538-4357/835/1/3] [Journal Article/Letter]

2016. "ON THE ORIGIN OF C4H AND CH3OH IN PROTOSTELLAR ENVELOPES." The Astrophysical Journal 833 (1): L14 [10.3847/2041-8213/833/1/l14] [Journal Article/Letter]

2016. "Catastrophic Disruption of Comet ISON." The Astrophysical Journal 831 (2): 207 [Journal Article/Letter]

2016. "A Search for O2 in CO-depleted Molecular Cloud Cores with Herschel." The Astrophysical Journal 830 (2): 102 [10.3847/0004-637x/830/2/102] [Journal Article/Letter]

2016. "On the nature of the enigmatic object IRAS 19312+1950: “A rare phase of massive star formation?." The Astrophysical Journal 828 (1): 51 [10.3847/0004-637x/828/1/51] [Journal Article/Letter]

2016. "ALMA OBSERVATIONS OF HCN AND ITS ISOTOPOLOGUES ON TITAN." The Astronomical Journal 152 (2): 42 [10.3847/0004-6256/152/2/42] [Journal Article/Letter]

2016. "Isotopic ratios of carbon and oxygen in Titan's CO using ALMA." The Astrophysical Journal 821 (1): L8 [10.3847/2041-8205/821/1/l8] [Journal Article/Letter]

2015. "Measuring the Distribution and Excitation of Cometary CH3OH Using ALMA." Proceedings of the International Astronomical Union 11 (A29A): 233-236 [10.1017/s1743921316002957] [Journal Article/Letter]

2015. "15N fractionation in star-forming regions and Solar System objects." Proceedings of the International Astronomical Union 11 (A29A): 271-274 [10.1017/s1743921316003033] [Journal Article/Letter]

2015. "The Composition of Comets." Space Sci Rev 197 (1-4): 9-46 [10.1007/s11214-015-0183-6] [Journal Article/Letter]

2015. "The Composition of the Protosolar Disk and the Formation Conditions for Comets." Space Science Reviews 197 (1-4): 151-190 [10.1007/s11214-015-0167-6] [Journal Article/Letter]

2015. "THE EVOLUTION OF VOLATILE PRODUCTION IN COMET C/2009 P1 (GARRADD) DURING ITS 2011–2012 APPARITION." The Astrophysical Journal 807 (1): 19 [10.1088/0004-637x/807/1/19] [Journal Article/Letter]

2015. "Cometary Isotopic Measurements." Space Science Reviews 197 (1-4): 47-83 [10.1007/s11214-015-0156-9] [Journal Article/Letter]

2014. "ERRATUM: “MAPPING THE RELEASE OF VOLATILES IN THE INNER COMAE OF COMETS C/2012 F6 (LEMMON) AND C/2012 S1 (ISON) USING THE ATACAMA LARGE MILLIMETER/SUBMILLIMETER ARRAY” (2014, ApJ, 792, L2)." The Astrophysical Journal 797 (1): L11 [10.1088/2041-8205/797/1/l11] [Journal Article/Letter]

2014. "GROUND-BASED MULTIWAVELENGTH OBSERVATIONS OF COMET 103P/HARTLEY 2." The Astrophysical Journal 794 (1): 1 [10.1088/0004-637x/794/1/1] [Journal Article/Letter]

2014. "Multilayer Formation and Evaporation of Deuterated Ices in Prestellar and Protostellar Cores." The Astrophysical Journal 791:1 20 [10.1088/0004-637X/791/1/1] [Journal Article/Letter]

2014. "Chirality of meteoritic free and IOM-derived monocarboxylic acids and implications for prebiotic organic synthesis." Geochimica et Cosmochimica Acta 131 1-12 [Full Text] [10.1016/j.gca.2014.01.035] [Journal Article/Letter]

2014. "Searches for HCl and HF in comets 103P/Hartley 2 and C/2009 P1 (Garradd) with theHerschelSpace Observatory." Astronomy & Astrophysics 562 A5 [10.1051/0004-6361/201322939] [Journal Article/Letter]

2014. "Negative ion chemistry in the coma of comet 1P/Halley." Meteoritics and Planetary Science 49 21 [Journal Article/Letter]

2013. "On the ubiquity of molecular anions in the dense interstellar medium." ApJ 770 48 [Journal Article/Letter]

2012. "Gas-grain chemical models for interstellar carbon chain anions." ApJ 749 120 [Journal Article/Letter]

2012. "Organic chemistry of low-mass star-forming cores I: 7 mm spectroscopy of Chamaeleon MMS1." ApJ 744 131 [Journal Article/Letter]

2012. "Isotopic Anomalies in Primitive Solar System Matter: Spin-state-dependent Fractionation of Nitrogen and Deuterium in Interstellar Clouds." ApJ 757 L11 [Journal Article/Letter]

2012. "Compound-specific carbon, nitrogen, and hydrogen isotopic ratios for amino acids in CM and CR chondrites and their use in evaluating potential formation pathways." Meteoritics & Planetary Science 47 (9): 1517–1536 [Full Text] [10.1111/j.1945-5100.2012.01415.x] [Journal Article/Letter]

2011. "EPOXI : COMET 103P/HARTLEY 2 OBSERVATIONS FROM A WORLDWIDE CAMPAIGN." The Astrophysical Journal 734 (1): L1 [10.1088/2041-8205/734/1/l1] [Journal Article/Letter]

2011. "Formation of benzene in the interstellar medium." PNAS 108 452 [Journal Article/Letter]

2011. "Discovery of Interstellar Anions in Cepheus and Auriga." The Astrophysical Journal Letters 730 L18 [Full Text] [10.1088/2041-8205/730/2/L18] [Journal Article/Letter]

2005. "Deep Impact: Observations from a Worldwide Earth-Based Campaign." Science 310 265 [Full Text] [10.1126/science.1118978] [Journal Article/Letter]


2017. "A Newly Discovered Source with Peculiar Chemistry Near the HH 111/HH 121 Protostellar System." American Astronomical Society Meeting Abstracts #229 229 212.04 [Proceedings]