Discovery of primitive CO
            <sub>2</sub>
            -bearing fluid in an aqueously altered carbonaceous chondrite

Tsuchiyama, A.; Miyake, Akira; Okuzumi, Satoshi; Kitayama, Akira; Kawano, Jun; Uesugi, Kentaro; Takeuchi, Akihisa; Nakano, Tsukasa; Zolensky, M. E.

doi:10.1126/sciadv.abg9707

Cited by 23 publications

(13 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These bodies may have a liquid phase at low temperatures, where water mixes with gases such as CO 2 and NH 3 (refs. [8][9][10] ). The chemistry in the liquid phase may further enhance the molecular complexity.…”

mentioning

confidence: 99%

A pathway to peptides in space through the condensation of atomic carbon

et al. 2022

View full text Add to dashboard Cite

Organic molecules are widely present in the dense interstellar medium, and many have been synthesized in the laboratory on Earth under the conditions typical for an interstellar environment. Until now, however, only relatively small molecules of biological interest have been demonstrated to form experimentally under typical space conditions. Here we prove experimentally that the condensation of carbon atoms on the surface of cold solid particles (cosmic dust) leads to the formation of isomeric polyglycine monomers (aminoketene molecules). Following encounters between aminoketene molecules, they polymerize to produce peptides of different lengths. The chemistry involves three of the most abundant species (CO, C and NH3) present in star-forming molecular clouds, and proceeds via a novel pathway that skips the stage of amino acid formation in protein synthesis. The process is efficient, even at low temperatures, without irradiation or the presence of water. The delivery of biopolymers formed by this chemistry to rocky planets in the habitable zone might be an important element in the origins of life.

show abstract

mentioning

confidence: 99%

A pathway to peptides in space through the condensation of atomic carbon

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Meteorite analyses of angrites and eucrites (Sarafian et al 2014(Sarafian et al , 2017 suggest the accretion of water in the inner solar system within the first few million years of its existence. Based on the present isotopic evidence, impactors with composition similar to carbonaceous chondrites were the main deliverers of water and volatiles in the inner solar system (Saal et al 2013;Sarafian et al 2014;Tsuchiyama et al 2021). Recent measurements of hydrogen contents and deuterium/hydrogen ratios also point out that most of Earth's water could have formed from hydrogen delivered by enstatite chondrite meteorites (Piani et al 2020).…”

Section: Introductionmentioning

confidence: 66%

Hydrogen emission from meteors and meteorites: mapping traces of H$_{2}$O molecules and organic compounds in small Solar system bodies

Matlovič,

Pisarčíková,

Tóth

et al. 2022

Preprint

View full text Add to dashboard Cite

The hydrogen emission from meteors is assumed to originate mainly from the meteoroid composition, making it a potential tracer of H 2 O molecules and organic compounds. Hα line was previously detected in individual fireballs, but its variation in a larger meteor dataset and dependency on the dynamical origin and physical properties have not yet been studied. Here we investigate the relative intensity of Hα within 304 meteor spectra observed by the AMOS network. We demonstrate that Hα emission is favored in faster meteors (v i >> 30 km s -1 ) which form the high-temperature spectral component. Hα was found to be a characteristic spectral feature of cometary meteoroids with ∼ 92% of all meteoroids with detected Hα originating from Halleytype and long-period orbits. Our results suggest that hydrogen is being depleted from meteoroids with lower perihelion distances (q < 0.4 au). No asteroidal meteoroids with detected H emission were found. However, using spectral data from simulated ablation of different meteorite types, we show that H emission from asteroidal materials can occur, and apparently correlates with their water and organic matter content. Strongest H emission was detected from carbonaceous chondrites (CM and CV) and achondrites (ureilite and aubrite), while it was lacking in most ordinary chondrites. The detection of Hα in asteroidal meteoroids could be used to identify meteoroids of carbonaceous or achondritic composition. Overall, our results suggest that Hα emission correlates with the emission of other volatiles (Na and CN) and presents a suitable tracer of water and organic matter in meteoroids.

show abstract

“…In that scenario, the fact that the number of very red asteroids is much smaller than that of D-type asteroids (similar to BRtype TNOs) would simply mean that these objects came from farther away. The implantation of outer solar system bodies in the asteroid belt during the early stage of solar system formation is supported by dynamical models (e.g., Raymond & Nesvorný in press), as well as by the recent discovery of a CO 2 -bearing fluid in the Sutter's Mill carbonaceous chondrite, which suggest that this meteorite formed beyond the CO 2 snowline (Tsuchiyama et al 2021). The fact that cold classical TNOs have a redder surface layer in the visible wavelength range than most dynamically excited TNOs, suggesting that the cold classical TNOs formed further away from the Sun than dynamically excited objects (e.g., Schwamb et al 2019), is consistent with this hypothesis.…”

Section: Discussionmentioning

confidence: 85%

Discovery of two TNO-like bodies in the asteroid belt

Hasegawa,

Marsset,

DeMeo

et al. 2021

Preprint

View full text Add to dashboard Cite

Two extremely red main-belt asteroids: 203 Pompeja and 269 Justitia, were identified from combined visible and near-infrared spectroscopic observations collected at the IRTF and SAO observatories. These two asteroids have a redder spectral slope than any other D-type body, which are the reddest objects in the asteroid belt, and similar to RR and IR-class objects found in the outer Solar System among trans-Neptunian objects and Centaurs. Spectroscopic results suggest the presence of complex organic materials on the surface layer of these asteroids, implying that they could have formed in the vicinity of Neptune and been transplanted to the main belt region during a phase of planetary migration. 203 Pompeia is the only very red asteroid known so far among the ∼250 bodies with diameter larger than 110 km (i.e. presumably structurally intact) found in the asteroid belt. These discoveries add another piece of evidence that the main asteroid belt hosts a population of bodies that were formed in the outskirt of the Solar System.

show abstract

Discovery of primitive CO ₂ -bearing fluid in an aqueously altered carbonaceous chondrite

Cited by 23 publications

References 32 publications

A pathway to peptides in space through the condensation of atomic carbon

A pathway to peptides in space through the condensation of atomic carbon

Hydrogen emission from meteors and meteorites: mapping traces of H$_{2}$O molecules and organic compounds in small Solar system bodies

Discovery of two TNO-like bodies in the asteroid belt

Contact Info

Product

Resources

About

Discovery of primitive CO 2 -bearing fluid in an aqueously altered carbonaceous chondrite

Cited by 23 publications

References 32 publications

A pathway to peptides in space through the condensation of atomic carbon

A pathway to peptides in space through the condensation of atomic carbon

Hydrogen emission from meteors and meteorites: mapping traces of H$_{2}$O molecules and organic compounds in small Solar system bodies

Discovery of two TNO-like bodies in the asteroid belt

Contact Info

Product

Resources

About

Discovery of primitive CO ₂ -bearing fluid in an aqueously altered carbonaceous chondrite