Abstract

Titan has an organic-rich atmosphere and surface with a subsurface liquid water ocean that may represent a habitable environment. In this work, we determined the amount of organic material that can be delivered from Titan's surface to its ocean through impact cratering. We assumed that Titan's craters produce impact melt deposits composed of liquid water that can founder in its lower-density ice crust and estimated the amount of organic molecules that could be incorporated into these melt lenses. We used known yields for HCN and Titan haze hydrolysis to determine the amount of glycine produced in the melt lenses and found a range of possible flux rates of glycine from the surface to the subsurface ocean. These ranged from 0 to 1011 mol/Gyr for HCN hydrolysis and from 0 to 1014 mol/Gyr for haze hydrolysis. These fluxes suggest an upper limit for biomass productivity of ∼103 kgC/year from a glycine fermentation metabolism. This upper limit is significantly less than recent estimates of the hypothetical biomass production supported by Enceladus's subsurface ocean. Unless biologically available compounds can be sourced from Titan's interior, or be delivered from the surface by other mechanisms, our calculations suggest that even the most organic-rich ocean world in the Solar System may not be able to support a large biosphere.

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References

Affholder A, Guyot F, Sauterey B, et al. Putative methanogenic biosphere in Enceladus's Deep Ocean: Biomass, productivity, and implications for detection. Planet Sci J 2022;3(12):270.
Amend JP, LaRowe DE, McCollom TM, et al. The energetics of organic synthesis inside and outside the cell. Philos Trans R Soc B Biol Sci 2013;368(1622):20120255.
Artemieva N, Lunine J. Cratering on Titan: Impact melt, ejecta, and the fate of surface organics. Icarus 2003;164(2):471–480.
Artemieva N, Lunine JI. Impact cratering on Titan II. Global melt, escaping ejecta, and aqueous alteration of surface organics. Icarus 2005;175(2):522–533.
Baland RM, Tobie G, Lefèvre A, et al. Titan's internal structure inferred from its gravity field, shape, and rotation state. Icarus 2014;237:29–41.
Barletta RE, Roe CH. Chemical analysis of ice vein μ-environments. Polar Rec 2012;48(4):334–341.
Barletta RE, Priscu JC, Mader HM, et al. Chemical analysis of ice vein microenvironments: II. Analysis of glacial samples from Greenland and Antarctica. J Glaciol 2012;58(212):1109–1118.
Bar-On YM, Phillips R, Milo R. The biomass distribution on Earth. Proc Natl Acad Sci U S A 2018;115(25):6506–6511.
Brassé C, Buch A, Coll P, et al. Low-temperature alkaline pH hydrolysis of oxygen-free Titan tholins: Carbonates' impact. Astrobiology 2017;17(1):8–26.
Carnahan E, Vance SD, Cox R, et al. Surface-to-ocean exchange by the sinking of impact generated melt chambers on Europa. Geophys Res Lett 2022;49(24):e2022GL100287.
Cleaves HJ, II, Neish C, Callahan MP, et al. Amino acids generated from hydrated Titan tholins: Comparison with Miller–Urey electric discharge products. Icarus 2014;237:182–189.
Coates JE, Hartshorne NH. Studies on hydrogen cyanide. Part III. The freezing points of hydrogen cyanide–water mixtures. J Chem Soc (Resumed) 1931;1931:657–665.
Cook-Hallett C, Barnes JW, Kattenhorn SA, et al. Global contraction/expansion and polar lithospheric thinning on Titan from patterns of tectonism. J Geophys Res Planets 2015;120(6):1220–1236.
Cornet T, Cordier D, Bahers TL, et al. Dissolution on Titan and on Earth: Toward the age of Titan's karstic landscapes. J Geophys Res Planets 2015;120(6):1044–1074.
Croft SK. The scaling of complex craters. J Geophys Res Solid Earth 1985;90(S02):C828–C842.
Crósta AP, Silber EA, Lopes RMC, et al. Modeling the formation of Menrva impact crater on Titan: Implications for habitability. Icarus 2021;370:114679.
de Vladar HP. Amino acid fermentation at the origin of the genetic code. Biol Direct 2012;7(1):6.
Di Sisto RP, and Rossignoli NL. Centaur and giant planet crossing populations: Origin and distribution. Celest Mech Dyn Astron 2020;132(6–7):36.
Ferris JP, Joshi PC, Edelson EH, et al. HCN: A plausible source of purines, pyrimidines and amino acids on the primitive earth. J Mol Evol 1978;11:293–311.
Flowers EE, Chyba CF. Shock synthesis of organic molecules by meteoroids in the atmosphere of Titan. Planet Sci J 2023;4(7):127.
Gastine T, Wicht J, Aurnou JM. Turbulent Rayleigh–Bénard convection in spherical shells. J Fluid Mech 2015;778:721–764.
Gastine T, Wicht J, Aubert J. Scaling regimes in spherical shell rotating convection. J Fluid Mech 2016;808:690–732.
Gerakines PA, Yarnall YY, Hudson RL. Direct measurements of infrared intensities of HCN and H2O+ HCN ices for laboratory and observational astrochemistry. Mon Not Royal Astron Soc 2022;509(3):3515–3522.
Greenstreet S, Gladman B, McKinnon WB, et al. Crater density predictions for New Horizons flyby target 2014 MU69. Astrophys J Lett 2019;872(1):L5.
Grieve RAF, Cintala MJ. An analysis of differential impact melt-crater scaling and implications for the terrestrial impact record. Meteoritics 1992;27(5):526–538.
He C, Hörst SM, Riemer S, et al. Carbon monoxide affecting planetary atmospheric chemistry. Astrophys J Lett 2017;841(2):L31.
Hedgepeth JE, Neish CD, Turtle EP, et al. Titan's impact crater population after Cassini. Icarus 2020;344:113664.
Hedgepeth JE, Buffo JJ, Chivers CJ, et al. Modeling the distribution of organic carbon and nitrogen in impact Crater melt on Titan. Planet Sci J 2022;3(2):51.
Hoehler TM, Mankel DJ, Girguis PR, et al. The metabolic rate of the biosphere and its components. Proc Natl Acad Sci U S A 2023;120(25):e2303764120.
Hörst SM. Titan's atmosphere and climate. J Geophys Res Planets 2017;122(3):432–482.
Hudson RL, Ferrante RF, Moore MH. Infrared spectra and optical constants of astronomical ices: I. Amorphous and crystalline acetylene. Icarus 2014;228:276–287.
Janssen MA, Le Gall A, Lopes RM, et al. Titan's surface at 2.18-cm wavelength imaged by the Cassini RADAR radiometer: Results and interpretations through the first ten years of observation. Icarus 2016;270:443–459.
Kalousová K, Sotin C. The insulating effect of methane clathrate crust on Titan's thermal evolution. Geophys Res Lett 2020;47(13):e2020GL087481.
Kalousová K, Wakita S, Sotin C, et al. Evolution of impact melt pools on Titan. 55th Annual Meeting of the Division for Planetary Sciences, id. 216.05. Bulletin of the American Astronomical Society, Vol. 55, No. 8 e-id 2023n8i216p05.
Khanna RK. Condensed species in Titan's stratosphere: Confirmation of crystalline cyanoacetylene (HC3N) and evidence for crystalline acetylene (C2H2) on Titan. Icarus 2005;178(1):165–170.
Khare BN, Sagan C, Ogino H, et al. Amino acids derived from Titan tholins. Icarus 1986;68(1):176–184.
Kirchoff MR, Dones L, Singer K, et al. Crater distributions of Uranus's mid-sized satellites and implications for outer Solar System bombardment. Planet Sci J 2022;3(2):42.
Korycansky DG, Zahnle KJ. Modeling crater populations on Venus and Titan. Planet Space Sci 2005;53(7):695–710.
Krasnopolsky VA. A photochemical model of Titan's atmosphere and ionosphere. Icarus 2009;201(1):226–256.
Lopes RM, Malaska MJ, Schoenfeld AM, et al. A global geomorphologic map of Saturn's moon Titan. Nat Astron 2020;4(3):228–233.
Lopes RM, Malaska MJ, Solomonidou A, et al. Nature, distribution, and origin of Titan's undifferentiated plains. Icarus 2016;270:162–182.
Lorenz RD. Microtektites on Mars: Volume and texture of distal impact ejecta deposits. Icarus 2000;144(2):353–366.
Luque-Almagro VM, Cabello P, Sáez LP, et al. Exploring anaerobic environments for cyanide and cyano-derivatives microbial degradation. Appl Microbiol Biotechnol 2018;102:1067–1074.
Maillard J, Hupin S, Carrasco N, et al. Structural elucidation of soluble organic matter: Application to Titan's haze. Icarus 2020;340:113627.
Malaska MJ, Radebaugh J, Lopes RM, et al. Labyrinth terrain on Titan. Icarus 2020;344:113764.
McKinnon WB, Chapman CR, Housen KR. Cratering of the Uranian satellites. In: Uranus. (Bergstralh JT, Miner ED, Matthews MS. eds.) University of Arizona Press: Tucson, AZ; 1991; pp. 629–692.
Miller KE, Melwani Daswani M, Malaska MJ, et al. Combined Geochemical and Geophysical Constraints on Titan Interior Composition. 55th Annual Meeting of the Divisionfor Planetary Sciences, id. 216.09. Bulletin of the American Astronomical Society, Vol. 55, No. 8 e-id 2023n8i216p09.
Miyakawa S, Cleaves HJ, Miller SL. The cold origin of life: B. Implications based on pyrimidines and purines produced from frozen ammonium cyanide solutions. Orig Life Evol Biosph 2002;32:209–218.
Neish CD, Lorenz RD. Titan's global crater population: A new assessment. Planet Space Sci 2012;60(1):26–33.
Neish CD, Somogyi A, Smith MA. Titan's primordial soup: formation of amino acids via low-temperature hydrolysis of tholins. Astrobiology 2010;10(3):337–347.
Neish CD, Lorenz RD, Turtle EP, et al. Strategies for detecting biological molecules on Titan. Astrobiology 2018;18(5):571–585.
Nisman B. The Stickland reaction. Bacteriol Rev 1954;18(1):16–42.
O'Brien DP, Lorenz RD, Lunine JI. Numerical calculations of the longevity of impact oases on Titan. Icarus 2005;173(1):243–253.
Orsi WD, Schink B, Buckel W, et al. Physiological limits to life in anoxic subseafloor sediment. FEMS Microbiol Rev 2020;44(2):219–231.
Pantzlaff L, Lueptow RM. Transient positively and negatively buoyant turbulent round jets. Exp Fluids 1999;27(2):117–125.
Poch O, Coll P, Buch A, et al. Production yields of organics of astrobiological interest from H2O–NH3 hydrolysis of Titan's tholins. Planet Space Sci 2012;61(1):114–123.
Ramírez SI, Coll P, Buch A, et al. The fate of aerosols on the surface of Titan. Faraday Discuss 2010;147:419–427.
Rodriguez S, Garcia A, Lucas A, et al. Global mapping and characterization of Titan's dune fields with Cassini: Correlation between RADAR and VIMS observations. Icarus 2014;230:168–179.
Sanchez R, Ferris J, Orgel LE. Conditions for purine synthesis: Did prebiotic synthesis occur at low temperatures? Science 1966;153(3731):72–73.
Schönheit P, Buckel W, Martin WF. On the origin of heterotrophy. Trends Microbiol 2016;24(1):12–25.
Soderlund KM. Ocean dynamics of outer solar system satellites. Geophys Res Lett 2019;46(15):8700–8710.
Sotin C, Kalousová K, Tobie G. Titan's interior structure and dynamics after the Cassini-Huygens mission. Annu Rev Earth Planet Sci 2021;49:579–607.
Stickland LH. Studies in the metabolism of the strict anaerobes (genus Clostridium): The chemical reactions by which Cl. sporogenes obtains its energy. Biochem J 1934;28(5):1746.
Thompson WR, Sagan C. Organic chemistry on Titan: surface interactions. In: Proceedings of the Symposium on Titan, 9–12 September 1991, Toulouse, France. ESA SP-338, pp. 167–176.
Thuku RN, Brady D, Benedik MJ, et al. Microbial nitrilases: Versatile, spiral forming, industrial enzymes. J Appl Microbiol 2009;106(3):703–727.
Tobie G, Lunine JI, Sotin C. Episodic outgassing as the origin of atmospheric methane on Titan. Nature 2006;440(7080):61–64.
Turner JS. Jets and plumes with negative or reversing buoyancy. J Fluid Mech 1966;26(4):779–792.
Wakita S, Johnson BC, Soderblom JM, et al. Modeling the formation of Selk impact crater on Titan: Implications for Dragonfly. Planet Sci J 2023;4(3):51.
Walker CC, Bassis JN, Schmidt BE. Propagation of vertical fractures through planetary ice shells: The role of basal fractures at the ice–ocean interface and proximal cracks. Planet Sci J 2021;2(4):135.
Williams DA, Malaska MJ, Lopes RMC, et al. First USGS Global Geologic Map of Titan: Draft for submission. LPI Contrib 2023;2806:1164.
Wünnemann K, Collins GS, Osinski GR. Numerical modelling of impact melt production in porous rocks. Earth Planet Sci Lett 2008;269(3–4):530–539.
Zahnle K, Schenk P, Levison H, et al. Cratering rates in the outer Solar System. Icarus 2003;163(2):263–289.
Associate Editor: Christopher McKay

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cover image Astrobiology
Astrobiology
Volume 24Issue Number 2February 2024
Pages: 177 - 189
PubMed: 38306187

History

Published online: 20 February 2024
Published ahead of print: 2 February 2024
Published in print: February 2024
Accepted: 1 January 2024
Received: 11 May 2023

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Department of Earth Sciences, The University of Western Ontario, London, Ontario, Canada.
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.
Christophe Sotin
Laboratoire de Planétologie et Géosciences, Nantes Université, Univ Angers, Le Mans Université, CNRS, UMR 6112, Nantes, France.
Rosaly M.C. Lopes
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.
Conor A. Nixon
Planetary Systems Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
Antonin Affholder
Department of Ecology and Evolutionary Biology, The University of Arizona, Tucson, Arizona, USA.
Audrey Chatain
Departamento de Física Aplicada, Escuela de Ingeniería de Bilbao, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Bilbao, Spain.
Charles Cockell
UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
Kendra K. Farnsworth
NASA Postdoctoral Program Fellow, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
Peter M. Higgins
Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada.
Kelly E. Miller
Southwest Research Institute, San Antonio, Texas, USA.
Krista M. Soderlund
Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas, USA.

Notes

Address correspondence to: Catherine Neish, Department of Earth Sciences, The University of Western Ontario, London, ON N6A 5B7, Canada [email protected]

Author Disclosure Statement

No competing financial interests exist.

Funding Information

This research was supported by the International Space Science Institute (ISSI) in Bern, through ISSI International Team project #539 (The habitability of Titan's subsurface water ocean). Catherine Neish also recognizes support from an NSERC Discovery grant. Charles Cockell acknowledges support from the Science and Technology Facilities Council (STFC), grant no. ST/V000586/1. Kelly E. Miller acknowledges support from NASA grant 80NSSC19K0559. Kendra K. Farnsworth was supported by an appointment to the NASA Postdoctoral Program at NASA Goddard Space Flight Center, administered by Oak Ridge Associated Universities under contract with NASA. Krista M. Soderlund acknowledges support by the NASA Astrobiology program grant Oceans Across Space and Time (Grant No. 80NSSC18K1301). Rosaly M.C. Lopes and Michael J. Malaska acknowledge support from the NASA Astrobiology Institute through its JPL-led team entitled Habitability of Hydrocarbon Worlds: Titan and Beyond. Part of this work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Government sponsorship is acknowledged.

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