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Collecting amino acids in the Enceladus plume

Published online by Cambridge University Press:  28 February 2018

Melissa Guzman*
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035, USA
Ralph Lorenz
Affiliation:
Johns Hopkins Applied Physics Lab, Laurel, MD 20723, USA
Dana Hurley
Affiliation:
Johns Hopkins Applied Physics Lab, Laurel, MD 20723, USA
William Farrell
Affiliation:
NASA Goddard Spaceflight Center, Greenbelt, MD 20771, USA
John Spencer
Affiliation:
Southwest Research Institute, Boulder, CO 80302, USA
Candice Hansen
Affiliation:
Planetary Science Institute, Tucson, AZ 85719, USA
Terry Hurford
Affiliation:
NASA Goddard Spaceflight Center, Greenbelt, MD 20771, USA
Jassmine Ibea
Affiliation:
Evergreen Valley College, San Jose, CA 95135, USA
Patrick Carlson
Affiliation:
University of California, Berkeley, CA 94720, USA
Christopher P. McKay
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035, USA
*
Author for correspondence: Melissa Guzman, E-mail: [email protected]

Abstract

We numerically model the dynamics of the Enceladus plume ice grains and define our nominal plume model as having a particle size distribution n(R) ~ R−q with q = 4 and a total particulate mass rate of 16 kg s−1. This mass rate is based on average plume brightness observed by Cassini across a range of orbital positions. The model predicts sample volumes of ~1600 µg for a 1 m2 collector on a spacecraft making flybys at 20–60 km altitudes above the Enceladus surface. We develop two scenarios to predict the concentration of amino acids in the plume based on these assumed sample volumes. We specifically consider Glycine, Serine, α-Alanine, α-Aminoisobutyric acid and Isovaline. The first ‘abiotic’ model assumes that Enceladus has the composition of a comet and finds abundances between 2 × 10−6 to 0.003 µg for dissolved free amino acids and 2 × 10−5 to 0.3 µg for particulate amino acids. The second ‘biotic’ model assumes that the water of Enceladus's ocean has the same amino acid composition as the deep ocean water on Earth. We compute the expected captured mass of amino acids such as Glycine, Serine, and α-Alanine in the ‘biotic’ model to be between 1 × 10−5 to 2 × 10−5 µg for dissolved free amino acids and dissolved combined amino acids and about 0.0002 µg for particulate amino acids. Both models consider enhancements due to bubble bursting. Expected captured mass of amino acids is calculated for a 1 m2 collector on a spacecraft making flybys with a closest approach of 20 km during mean plume activity for the given nominal particle size distribution.

Type
Research Article
Creative Commons
This is a work of the U.S. Government and is not subject to copyright protection in the United States.
Copyright
Copyright © Cambridge University Press 2018

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References

Altwegg, K, Balsiger, H, Bar-Nun, A, Berthelier, J-J, Bieler, A, Bochsler, P, Briois, C, Calmonte, U, Combi, MR, Cottin, H, De Keyser, J, Dhooghe, F, Fiethe, B, Fuselier, SA, Gasc, S, Gombosi, TI, Hansen, KC, Haessig, M, Jäckel, A, Kopp, E, Korth, A, Le Roy, L, Mall, U, Marty, B, Mousis, O, Owen, T, Rème, H, Rubin, M, Sémon, T, Tzou, CY, Hunter Waite, J and Wurz, P (2016) Prebiotic chemicals – amino acids and phosphorus – in the coma of comet 67P/Churyumov-Gerasimenko. Science Advances 2(5), e1600285.Google Scholar
Blanchard, DC (1982) The production, distribution, and bacterial enrichment of the sea-salt aerosol. In Liss PS and Slinn WGN (Eds). Air-Sea Exchange of Gases and Particles. Dordrecht: D. Reidel Publishing Company, pp. 407454.Google Scholar
Blanchard, DC and Syzdek, LD (1972) Concentration of bacteria in jet drops from bursting bubbles. Journal of Geophysical Research: Oceans and Atmospheres 77, 50875099.Google Scholar
Blanchard, DC and Syzdek, LD (1982) Water-to-Air transfer and enrichment of bacteria in drops from bursting bubbles. Applied and Environmental Microbiology 43(5), 10011005.Google Scholar
Bouquet, A, Mousis, O, Waite, J and Picaud, S (2015) Possible evidence for a methane source in Enceladus’ ocean. Geophysical Research Letters 42, 13341339.Google Scholar
Čadek, O, Tobie, G, Van Hoolst, T, Massé, M, Choblet, G, Lefèvre, A, Mitri, G, Baland, R-M, Běhounková, M, Bourgeois, O and Trinh, A (2016) Enceladus's internal ocean and ice shell constrained from Cassini gravity, shape, and libration data. Geophysical Research Letters 43(11), 56535660.Google Scholar
Cicerone, RJ (1981) Halogens in the atmosphere. Reviews of Geophysics 19(1), 123139.Google Scholar
Cody, GD, Heying, E, Alexander, CMO, Nittler, LR, Kilcoyne, ALD, Sandford, SA and Stroud, RM (2011) Establishing a molecular relationship between chondritic and cometary organic solids. s.l.. National Academy of Sciences 108(48), 1917119176.Google Scholar
Degruyter, W and Manga, M (2011) Cryoclastic origin of particles on the surface of Enceladus. Geophysical Research Letters 38, 15.Google Scholar
Dong, Y, Hill, T and Ye, S-Y (2015) Characteristics of ice grains in the Enceladus plume from Cassini observations. Journal of Geophysical Research: Space Physics 120, 915937.Google Scholar
Fowler, M, Leger, L, Donahoo, M and Maley, P (1990) Contamination of Spacecraft by Recontact of Dumped Liquids. Houston: Third Annual Workshop on Space Operations Automation and Robotics (SOAR).Google Scholar
Fray, N, Bardyn, A, Cottin, H, Altwegg, K, Baklouti, D, Briois, C, Colangeli, L, Engrand, C, Fischer, H, Glasmachers, A, Grün, E, Haerendel, G, Henkel, H, Höfner, H, Hornung, K, Jessberger, EK, Koch, A, Krüger, H, Langevin, Y, Lehto, H, Lehto, K, Le Roy, L, Merouane, S, Modica, P, Orthous-Daunay, FR, Paquette, J, Raulin, F, Rynö, J, Schulz, R, Silén, J, Siljeström, S, Steiger, W, Stenzel, O, Stephan, T, Thirkell, L, Thomas, R, Torkar, K, Varmuza, K, Wanczek, KP, Zaprudin, B, Kissel, J and Hilchenbach, M (2016) High-molecular-weight organic matter in the particles of comet 67P/Churyumov-Gerasimenko. Nature 538(7623), 7274.Google Scholar
Glavin, DP, Callahan, MP, Dworkin, JP and Elsila, JE (2011) The effects of parent body processes on amino acids in carbonaceous chondrites. Meteoritics and Planetary Science 45, 19481972.Google Scholar
Hansen, CJ, Esposito, L, Stewart, AIF, Colwell, J, Hendrix, A, Pryor, W, Shemansky, D and West, R (2006) Enceladus’ water vapor plume. Science 311, 14221425.Google Scholar
Hedman, MM, Gosmeyer, CM, Nicholson, PD, Sotin, C, Brown, RH, Clark, RN, Baines, KH, Buratti, BJ and Showalter, MR (2013) An observed correlation between plume activity and tidal stresses on Enceladus. Nature 500, 182184.Google Scholar
Hsu, H-W, Postberg, F, Sekine, Y, Shibuya, T, Kempf, S, Horányi, M, Juhász, A, Altobelli, N, Suzuki, K, Masaki, Y, Kuwatani, T, Tachibana, S, Sirono, SI, Moragas-Klostermeyer, G and Srama, R (2015) Ongoing hydrothermal activities within Enceladus. Nature 519, 207210.Google Scholar
Hurford, TA, Helfenstein, P, Hoppa, GV, Greenberg, R and Bills, BG (2007) Eruptions arising from tidally controlled periodic openings of rifts on Enceladus. Nature 447, 292294.Google Scholar
Iess, L, Stevenson, DJ, Parisi, M, Hemingway, D, Jacobson, RA, Lunine, JI, Nimmo, F, Armstrong, JW, Asmar, SW, Ducci, M and Tortora, P (2014) The gravity field and interior structure of Enceladus. Science 78(344), 7880.Google Scholar
Ingersoll, AP and Ewald, SP (2016) Decadal timescale variability of the Enceladus plumes inferred from Cassini images. Icarus 282, 260275.Google Scholar
Keene, WC and Savoie, D (1998) The pH of deliquesced sea-salt aerosol in polluted marine air. Geophysical Research Letters 25(12), 21812184.Google Scholar
Kempf, S, Beckmann, U, Moragas-Klostermeyer, G, Postberg, F, Srama, R, Economou, T, Schmidt, J, Spahn, F and Grün, E (2008) The E ring in the vicinity of Enceladus I. Spatial distribution and properties of the ring particles. Icarus 193(2), 420437.Google Scholar
Kempf, S, Beckmann, U and Schmidt, J (2010) How the Enceladus dust plume feeds Saturn's E ring. Icarus 206, 446457.Google Scholar
Kempf, S, Southworth, B, Srama, R, Schmidt, J and Postberg, F (2016) Abstract #184020. San Francisco: American Geophysical Union.Google Scholar
Kofsky, IL, Rall, DLA, Maris, MA, Tran, NH, Murad, E, Pike, CP, Knecht, DJ, Viereck, RA, Stair, AT Jr and Setayesh, A (1992) Phenomenology of a water venting in low Earth orbit. Acta Astronautica 26(5), 325347.Google Scholar
Kok, J, Parteli, E, Michaels, T and Bou, KD (2012) The physics of wind-blown sand and dust. Reports on Progress in Physics 75, 106901.Google Scholar
Kuznetsova, M, Lee, C and Aller, J (2005) Characterization of the proteinaceous matter in marine aerosols. Marine Chemistry 96(3–4), 359377.Google Scholar
Lee, C and Bada, J (1977) Dissolved amino acids in the equatorial Pacific, the Sargasso Sea, and Biscayne Bay. Limnology and Oceanography 22(3), 502510.Google Scholar
Lorenz, R (2015) Io volcanic plumes: spacecraft flythrough hazard evaluation. Journal of Spacecraft and Rockets 52(3), 990992.Google Scholar
Lorenz, R (2016) Europa ocean sampling by plume flythrough: astrobiological expectations. Icarus 267, 217219.Google Scholar
McKay, CP, Khare, BN, Amin, R, Klasson, M and Kral, TA (2012) Possible sources for methane and C2-C5 organics in the plume of Enceladus. Planetary and Space Science 71(1), 7379.Google Scholar
McKay, CP, Anbar, AD, Porco, C and Tsou, P (2014) Follow the plume: the habitability of Enceladus. Astrobiology 14(4), 352355.Google Scholar
Meier, P, Kriegel, H, Motschmann, U, Schmidt, J, Spahn, F, Hill, TW, Dong, Y and Jones, GH (2014) A model of the spatial and size distribution of Enceladus’ dust plume. Planetary and Space Science 104, 216233.Google Scholar
Middlebrook, AM, Murphy, DM and Thomson, DS (1998) Observations of organic material in individual marine particles at Cape Grim during the first Aerosol characterization experiment (ACE 1). Journal of Geophysical Research Atmospheres 103(D13), 1647516483.Google Scholar
Moura, A, Savageau, M and Alves, R (2013) Relative amino acid composition signatures of organisms and environments. PLOS ONE 8(10), 19.Google Scholar
Murphy, D, Thomson, D and Middlebrook, A (1997) Bromine, iodine, and chlorine in single aerosol particles at Cape Grim. Geophysical Research Letters 24(24), 31973200.Google Scholar
Porco, CC, Helfenstein, P, Thomas, PC, Ingersoll, AP, Wisdom, J, West, R, Neukum, G, Denk, T, Wagner, R, Roatsch, T, Kieffer, S, Turtle, E, McEwen, A, Johnson, TV, Rathbun, J, Veverka, J, Wilson, D, Perry, J, Spitale, J, Brahic, A, Burns, JA, Delgenio, AD, Dones, L, Murray, CD and Squyres, S (2006) Cassini observes the active south pole of Enceladus. Science 311, 13931401.Google Scholar
Porco, C, DiNino, D and Nimmo, F (2014) How the geysers, tidal stresses, and thermal emission across the south polar terrain of Enceladus are related. The Astronomical Journal 148(45), 24.Google Scholar
Porco, CC, Dones, L and Mitchell, C (2017a). Could it be snowing microbes on Enceladus? Assessing conditions in its plume and implications for future missions. Astrobiology 17(9), 876901.Google Scholar
Porco, C, Dones, L and Mitchell, C (2017b). Flying Through the Plume of Enceladus. Boulder: Astrobiology Science Conference.Google Scholar
Postberg, F, Kempf, S, Schmidt, J, Brilliantov, N, Beinsen, A, Abel, B, Buck, U and Srama, R (2009) Sodium salts in E-ring ice grains from an ocean below the surface of Enceladus. Nature 459, 10981101.Google Scholar
Postberg, F, Schmidt, J, Hillier, J, Kempf, S and Srama, R (2011) A salt-water reservoir as the source of a compositionally stratified plume on Enceladus. Nature 474, 620622.Google Scholar
Postberg, F, Khawaja, N, Hsu, HW, Sekine, Y and Shibuya, T (2015) Refractory Organic Compounds in Enceladus' Ice Grains and Hydrothermal Activity. San Francisco: American Geophysical Union.Google Scholar
Schmidt, J, Brilliantov, N, Spahn, F and Kempf, S (2008) Slow dust in Enceladus' plume from condensation and wall collisions in tiger stripe fractures. Nature 451, 685688.Google Scholar
Sekine, Y, Shibuya, T, Postberg, F, Hsu, HW, Suzuki, K, Masaki, Y, Kuwatani, T, Mori, M, Hong, PK, Yoshizaki, M, Tachibana, S and Sirono, SI (2015) High-temperature water-rock interactions and hydrothermal environments in the chondrite-like core of Enceladus. Nature Communications 6, 8604.Google Scholar
Sommerville, K and Preston, T (2001) Characterisation of dissolved combined amino acids in marine waters. Rapid Communications in Mass Spectrometry 15(15), 12871290.Google Scholar
Spencer, JR, Pearl, JC, Segura, M, Flasar, FM, Mamoutkine, A, Romani, P, Buratti, BJ, Hendrix, AR, Spilker, LJ and Lopes, RMC (2006) Cassini encounters Enceladus: background and the discovery of a South polar hot spot. Science 311(5766), 14011405.Google Scholar
Spitale, JN, Hurford, TA, Rhoden, AR, Berkson, EE and Platts, SS (2015) Curtain eruptions from Enceladus' south-polar terrain. Nature 521, 5760.Google Scholar
Thomas, PC, Tajeddine, R, Tiscareno, MS, Burns, JA, Joseph, J, Loredo, TJ, Helfenstein, P and Porco, C (2016) Enceladus's measured physical libration requires a global subsurface ocean. Icarus 264, 3747.Google Scholar
Tsou, P, Brownlee, DE, McKay, CP, Anbar, AD, Yano, H, Altwegg, K, Beegle, LW, Dissly, R, Strange, NJ and Kanik, I (2012) Life investigation for Enceladus: a sample return mission concept in search for evidence of life. Astrobiology 12(8), 730742.Google Scholar
Waite, JH Jr, Combi, MR, Ip, W-H, Cravens, TE, McNutt, RL Jr, Kasprzak, W, Yelle, R, Luhmann, J, Niemann, H, Gell, D, Magee, B, Fletcher, G, Lunine, J and Tseng, W-L (2006) Cassini Ion and neutral mass spectrometer: enceladus plume composition and structure. Science 311, 14191422.Google Scholar
Waite, JH Jr, Young, DT, Cravens, TE, Coates, AJ, Crary, FJ, Magee, B and Westlake, J (2007) The process of tholin formation in Titan's upper atmosphere. Science 316(5826), 870875.Google Scholar
Waite, JH Jr, Lewis, WS, Magee, BA, Lunine, JI, McKinnon, WB, Glein, CR, Mousis, O, Young, DT, Brockwell, T, Westlake, J, Nguyen, M-J, Teolis, BD, Niemann, HB, McNutt, RL Jr, Perry, M and Ip, W-H (2009) Liquid water on Enceladus from observations of ammonia and 40-Ar in the plume. Nature 460, 487490.Google Scholar
Waite, JH, Glein, CR, Perryman, RS, Teolis, BD, Magee, BA, Miller, G, Grimes, J, Perry, ME, Miller, KE, Bouquet, A, Lunine, JI, Brockwell, T and Bolton, SJ (2017) Cassini finds molecular hydrogen in the Enceladus plume: evidence for hydrothermal processes. Science 356(6334), 155159.Google Scholar
Warneck, P (1988) Chemistry of the Natural Atmosphere – International Geophysics Series no. 41. San Diego: Academic Press.Google Scholar
Ye, S-Y, Gurnett, DA, Kurth, WS, Averkamp, TF, Morooka, M, Sakai, S and Wahlund, J-E (2014) Electron density inside the Enceladus plume inferred from plasma oscillations excited by dust impacts. Journal of Geophysical Research: Space Physics 119(5), 33733380.Google Scholar
Yelle, R, Soderblom, L and Jokipii, J (2004) Formation of jets in comet 19P/borrelly by subsurface geysers. Icarus 167(1), 3036.Google Scholar
Yeoh, SK, Li, Z, Goldstein, DB, Varghese, PL, Levin, DA and Trafton, LM (2016) Constraining the Enceladus plume using numerical simulation and Cassini data. Icarus 281, 122.Google Scholar