Solar system abundances and condensation temperatures of the halogens fluorine, chlorine, bromine, and iodine

Lodders, K.; Fegley, B.

doi:10.1016/j.chemer.2023.125957

Cited by 16 publications

(7 citation statements)

References 200 publications

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“…(We thank Toni Wallner for pointing this out.) While the cosmic dust properties of iodine are not well known(Lodders & Fegley 2023) and merit further study, it is possible that the surviving dust fraction of 129 I will be lower than other rprocess elements including 244 Pu.…”

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confidence: 99%

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea ²⁴⁴Pu

Wang

Clark

Ellis

et al. 2023

ApJ

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244Pu has recently been discovered in deep-sea deposits spanning the past 10 Myr, a period that includes two 60Fe pulses from nearby supernovae. 244Pu is among the heaviest r-process products, and we consider whether it was created in supernovae, which is disfavored by nucleosynthesis simulations, or in an earlier kilonova event that seeded the nearby interstellar medium with 244Pu that was subsequently swept up by the supernova debris. We discuss how these possibilities can be probed by measuring 244Pu and other r-process radioisotopes such as 129I and 182Hf, both in lunar regolith samples returned to Earth by missions such as Chang’e and Artemis, and in deep-sea deposits.

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confidence: 99%

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea ²⁴⁴Pu

Wang

Clark

Ellis

et al. 2023

ApJ

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“…Recent work byLodders & Fegley (2023) indicates that the 50% condensation temperature for Cl may be significantly lower than that adopted here Lodders & Fegley (2023). find a value of T C = 427 K for Cl, which would place it among the low-depletion elements with T C 800 K.…”

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confidence: 51%

A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium

Ritchey¹,

Brown²,

Federman³

et al. 2023

Preprint

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We present a comprehensive examination of interstellar P and Cl abundances based on an analysis of archival spectra acquired with the Space Telescope Imaging Spectrograph of the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. Column densities of P ii, Cl i, and Cl ii are determined for a combined sample of 107 sight lines probing diffuse atomic and molecular gas in the local Galactic interstellar medium (ISM). We reevaluate the nearly linear relationship between the column densities of Cl i and H 2 , which arises from the rapid conversion of Cl + to Cl 0 in regions where H 2 is abundant. Using the observed total gas-phase P and Cl abundances, we derive depletion parameters for these elements, adopting the methodology of Jenkins. We find that both P and Cl are essentially undepleted along sight lines showing the lowest overall depletions. Increasingly severe depletions of P are seen along molecule-rich sight lines. In contrast, gas-phase Cl abundances show no systematic variation with molecular hydrogen fraction. However, enhanced Cl (and P) depletion rates are found for a subset of sight lines showing elevated levels of Cl ionization. An analysis of neutral chlorine fractions yields estimates for the amount of atomic hydrogen associated with the H 2 -bearing gas in each direction. These results indicate that the molecular fraction in the H 2 -bearing gas is at least 10% for all sight lines with log N (H 2 ) 18 and that the gas is essentially fully molecular at log N (H 2 ) ≈ 21.

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“…Recent work byLodders & Fegley (2023) indicates that the 50% condensation temperature for Cl may be significantly lower than that adopted here Lodders & Fegley (2023). found a value of T C = 427 K for Cl, which would place it among the low-depletion elements with T C  800 K.…”

mentioning

confidence: 52%

A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium*

Ritchey

Brown

Federman

et al. 2023

ApJ

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We present a comprehensive examination of interstellar P and Cl abundances based on an analysis of archival spectra acquired with the Space Telescope Imaging Spectrograph of the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. Column densities of P ii, Cl i, and Cl ii are determined for a combined sample of 107 sight lines probing diffuse atomic and molecular gas in the local Galactic interstellar medium. We reevaluate the nearly linear relationship between the column densities of Cl i and H2, which arises from the rapid conversion of Cl+ to Cl0 in regions where H2 is abundant. Using the observed total gas-phase P and Cl abundances, we derive depletion parameters for these elements, adopting the methodology of Jenkins. We find that both P and Cl are essentially undepleted along sight lines showing the lowest overall depletions. Increasingly severe depletions of P are seen along molecule-rich sight lines. In contrast, gas-phase Cl abundances show no systematic variation with molecular hydrogen fraction. However, enhanced Cl (and P) depletion rates are found for a subset of sight lines showing elevated levels of Cl ionization. An analysis of neutral chlorine fractions yields estimates for the amount of atomic hydrogen associated with the H2-bearing gas in each direction. These results indicate that the molecular fraction in the H2-bearing gas is at least 10% for all sight lines with log N ( H 2 ) ≳ 18 and that the gas is essentially fully molecular at log N ( H 2 ) ≈ 21 .

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Solar system abundances and condensation temperatures of the halogens fluorine, chlorine, bromine, and iodine

Cited by 16 publications

References 200 publications

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea ²⁴⁴Pu

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea ²⁴⁴Pu

A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium

A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium*

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Solar system abundances and condensation temperatures of the halogens fluorine, chlorine, bromine, and iodine

Cited by 16 publications

References 200 publications

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea 244Pu

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea 244Pu

A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium

A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium*

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Product

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Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea ²⁴⁴Pu

Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea ²⁴⁴Pu