- M. P. Callahanet al., Carbonaceous meteorites contain a
wide range of extraterrestrial nucleobases.Proc. Natl. Acad.
Sci. U.S.A. 108 , 13995–13998 (2011). doi:10.1073/
pnas.1106493108; pmid: 21836052 - N. R. Lerner, G. W. Cooper, Iminodicarboxylic acids in the
Murchison meteorite: Evidence of Strecker reactions.
Geochim. Cosmochim. Acta 69 , 2901–2906 (2005).
doi:10.1016/j.gca.2004.12.024 - B. Burcaret al., Darwin’s warm little pond: A one-pot reaction
for prebiotic phosphorylation and the mobilization of
phosphate from minerals in a urea-based solvent.Angew.
Chem. Int. Ed. 55 , 13249–13253 (2016). doi:10.1002/
anie.201606239; pmid: 27532228 - P. Dziedzic, A. Bartoszewicz, A. Córdova, Inorganic ammonium
salts as catalysts for direct aldol reactions in the presence
of water.Tetrahedron Lett. 50 , 7242–7245 (2009).
doi:10.1016/j.tetlet.2009.10.014 - B. Hapke,Theory of Reflectance and Emittance Spectroscopy
(Cambridge Univ. Press, ed. 2, 2012). - B. Schmitt, Near and Mid-IR optical constants of crystalline
H2O ice Ih at 140–145K. SSHADE/GhoSST (OSUG Data
Center). Dataset/Spectral Data. (2004); doi:10.26302/
SSHADE/EXPERIMENT_BS_20200103_001 - D. Takiret al., Nature and degree of aqueous alteration in CM
and CI carbonaceous chondrites.Meteorit. Planet. Sci. 48 ,
1618 – 1637 (2013). doi:10.1111/maps.12171 - A. S. Rivkin, J. P. Emery, Detection of ice and organics on an
asteroidal surface.Nature 464 , 1322–1323 (2010).
doi:10.1038/nature09028; pmid: 20428165 - J. Licandroet al., (65) Cybele: Detection of small silicate
grains, water-ice, and organics.Astron. Astrophys. 525 , A34
(2011). doi:10.1051/0004-6361/201015339 - M. E. Brown, The 3-4mm spectra of Jupiter Trojan
asteroids.Astron. J. 152 , 159 (2016). doi:10.3847/0004-6256/
152/6/159 - J. P. Emery, D. M. Burr, D. P. Cruikshank, Near-infrared
spectroscopy of Trojan Asteroids: Evidence for two
compositional groups.Astron.J. 141 ,25 (2011). doi:10.1088/
0004-6256/141/1/25 - O. Poch, I. Istiqomah, Vis-NIR bidirectional reflection spectra of
several ammonium salts mixed with pyrrhotite grains in
sublimate residues at 173 K. SSHADE/GhoSST (OSUG Data
Center) Dataset/Spectral Data (2018); doi:10.26302/
SSHADE/EXPERIMENT_OP_20191119_001
68. O. Poch, Vis-NIR bidirectional reflection spectra of several
ammonium salts mixed with graphite powder at 296 K.
SSHADE/GhoSST (OSUG Data Center) Dataset/Spectral
Data (2018); doi:10.26302/SSHADE/EXPERIMENTOP
20200212_001
ACKNOWLEDGMENTS
O.P., I.I., and E.Q. thank F. Charlot of the Consortium des Moyens
Technologiques Communs (CMTC) at the Institut National
Polytechnique de Grenoble (INP) for the Scanning Electron
Microscopy images of the samples. We acknowledge M. Faure for
work on the VIRTIS data and the collaboration of the International
Space Science Institute (ISSI) international team number 397
“Comet 67P/Churyumov-Gerasimenko Surface Composition as a
Playground for Radiative Transfer Modeling and Laboratory
Measurements.”O.P. thanks C. Pilorget for insightful comments.
Funding:O.P. acknowledges a postdoctoral fellowship from the
Centre National d’Etudes Spatiales (CNES). I.I. acknowledges a
thesis grant from the Lembaga Pengelola Dana Pendidikan (LPDP)
Indonesian scholarship. L.M. acknowledges the Deutsche
Forschungsgemeinschaft (DFG) grant MO 3007/1-1. D.K.
acknowledges DFG-grant KA 3757/2-1. The work of O.P., I.I., E.Q.,
P.B., B.S., and L.B. was supported by the CNES and the French
Agence Nationale de la Recherche (program Classy, ANR-17-CE31-
0004). P.B. acknowledges funding from the European Research
Council under the SOLARYS grant (ERC-CoG2017-771691). P.H.-B.
acknowledges the LabEx Observatoire des Sciences de l’Univers de
Grenoble OSUG @ 2020 for funding. S.P. is supported by
Université Grenoble Alpes (UGA), Initiatives de Recherche
Stratégiques (IRS), and Initiatives d’Excellence UGA (IDEX UGA).
The development of the CarboN-IR environmental chamber was
supported by the French National Program of Planetology (PNP),
the development of the reflectance goniometers was supported by
the University of Grenoble Alpes (Initiative de Recherche
Stratégique). Université Grenoble Alpes (UGA) and CNES
supported the instrumental facilities and activities at IPAG. The
following institutions and agencies supported the Rosetta mission:
the Italian Space Agency (ASI, Italy), Centre National d’Etudes
Spatiales (CNES, France), Deutsches Zentrum für Luft- und
Raumfahrt (DLR, Germany), the National Aeronautic and Space
Administration (NASA, United States) Rosetta Program and the
Science and Technology Facilities Council (United Kingdom).
VIRTIS was built by a consortium including Italy, France, and
Germany, under the scientific responsibility of the Istituto diAstrofisica e Planetologia Spaziali of INAF, Italy, which also guided
scientific operations. The development of the VIRTIS instrument
was funded and managed by ASI, with contributions from
Observatoire de Meudon, financed by CNES, and from DLR. A.R.,
M.C., G.F., F.C., M.C.D.S., A.L., E.P., and F.T. acknowledge financial
support from the National Institute for Astrophysics (INAF, Italy) and
the Italian Space Agency (ASI, Italy) through contract I/024/12/2.
Computational resources were provided by INAF-IAPS through the
DataWell project. The work of A.P. and N.T. was carried out within
the framework of the National Centre of Competence in Research
(NCCR) PlanetS supported by the Swiss National Science
Foundation.Author contributions:O.P. and I.I. carried out the
laboratory experiments. O.P. wrote the manuscript with assistance
from P.B., E.Q., and B.S., who also contributed to interpreting the
results. E.Q., P.H.-B., A.F., and P.B. calculated the nitrogen
distribution and N/C ratio. O.P., E.Q., and A.F. produced the figures.
A.R., M.C., and G.F. provided the calibrated average reflectance
spectrum of comet 67P and wrote parts of the supplementary
materials. O.B., S.P., B.R., and L.F. contributed to the experimental
work. N.T. and A.P. contributed to the early development of
spectroscopic studies of sublimate residues. All co-authors
contributed to the preparation of the manuscript.Competing
interests:We declare no competing interests.Data and materials
availability:The laboratory reflectance spectra are available in the
Grenoble Astrophysics and Planetology Solid Spectroscopy and
Thermodynamics (GhoSST) database ( 67 , 68 ). The average
reflectance spectrum of comet 67P measured by VIRTIS is available
from ( 10 ), their‘source data Fig. 1.’The reference spectra of Mars
and Lutetia are available from the Planetary Science Archive
https://archives.esac.esa.int/psa/#!Table%20Viewby selecting
Mars or 21 Lutetia as the target, VIRTIS (Rosetta) as the instrument,
clicking search, then filtering by observation IDs I1_00130974021
for Mars or I1_00237396952 for Lutetia.SUPPLEMENTARY MATERIALS
science.sciencemag.org/content/367/6483/eaaw7462/suppl/DC1
Materials and Methods
Figs. S1 to S9
Tables S1 and S2
References ( 69 – 89 )
21 January 2019; resubmitted 11 October 2019
Accepted 14 February 2020
10.1126/science.aaw7462Pochet al.,Science 367 , eaaw7462 (2020) 13 March 2020 6of6
RESEARCH | RESEARCH ARTICLE