Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism
Converging lines of evidence show that protoplanetary disks are complex environments hosting spatial and temporal variability at multiple scales. Here we reanalyze paleomagnetic estimates of solar nebula magnetic field strengths using a Bayesian framework that tests for recording bias due to chondru...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Planetary Science Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/PSJ/ace716 |
| _version_ | 1827360039261700096 |
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| author | Roger R. Fu Sarah C. Steele Jacob B. Simon Richard Teague Joan Najita David Rea |
| author_facet | Roger R. Fu Sarah C. Steele Jacob B. Simon Richard Teague Joan Najita David Rea |
| author_sort | Roger R. Fu |
| collection | DOAJ |
| description | Converging lines of evidence show that protoplanetary disks are complex environments hosting spatial and temporal variability at multiple scales. Here we reanalyze paleomagnetic estimates of solar nebula magnetic field strengths using a Bayesian framework that tests for recording bias due to chondrule motion and explicitly accounts for time-varying ambient fields. We find that LL and CO group chondrule paleointensities likely rotated during cooling ( p = 0.79–0.99), validating assumptions in previous paleomagnetic studies. Chondrule rotation also suggests low gas density formation environments beyond 2 and 4 au for LL and CO chondrules, respectively. Our recomputed paleointensities for LL and CO chondrules imply either: (1) temporally constant magnetic fields of ${34}_{-14}^{+36}$ μ T and ${106}_{-18}^{+88}$ μ T, respectively; or (2) time-varying magnetic fields with peak amplitudes between ${49}_{-21}^{+97}$ μ T and ${128}_{-11}^{+307}$ μ T. Considering the known mechanisms for sustaining magnetic field gradients and high-amplitude temporal magnetic fluctuations in the solar nebula, we find that magnetic field flux concentrations in disk gaps or time-varying magnetic fields, for example due to the Hall shear instability, are most compatible with the existing data. Using this statistical framework, future paleointensity studies of chondrules can be used to directly test for the variability of magnetic fields in the solar system protoplanetary disk and to distinguish between these scenarios. |
| first_indexed | 2024-03-08T06:40:02Z |
| format | Article |
| id | doaj.art-31c98049ecd04858a47f7873e8f53b22 |
| institution | Directory Open Access Journal |
| issn | 2632-3338 |
| language | English |
| last_indexed | 2024-03-08T06:40:02Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Planetary Science Journal |
| spelling | doaj.art-31c98049ecd04858a47f7873e8f53b222024-02-03T09:05:07ZengIOP PublishingThe Planetary Science Journal2632-33382023-01-014815110.3847/PSJ/ace716Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule PaleomagnetismRoger R. Fu0Sarah C. Steele1Jacob B. Simon2https://orcid.org/0000-0002-3771-8054Richard Teague3https://orcid.org/0000-0003-1534-5186Joan Najita4https://orcid.org/0000-0002-5758-150XDavid Rea5Department of Earth and Planetary Science, Harvard University , Cambridge, MA 02138, USADepartment of Earth and Planetary Science, Harvard University , Cambridge, MA 02138, USADepartment of Physics and Astronomy, Iowa State University of Science and Technology , Ames, IA 50011, USADepartment of Earth, Atmospheric and Planetary Sciences , MIT, Cambridge, MA 02139, USANOIRLab , Tucson, AZ 85719, USADepartment of Physics and Astronomy, Iowa State University of Science and Technology , Ames, IA 50011, USAConverging lines of evidence show that protoplanetary disks are complex environments hosting spatial and temporal variability at multiple scales. Here we reanalyze paleomagnetic estimates of solar nebula magnetic field strengths using a Bayesian framework that tests for recording bias due to chondrule motion and explicitly accounts for time-varying ambient fields. We find that LL and CO group chondrule paleointensities likely rotated during cooling ( p = 0.79–0.99), validating assumptions in previous paleomagnetic studies. Chondrule rotation also suggests low gas density formation environments beyond 2 and 4 au for LL and CO chondrules, respectively. Our recomputed paleointensities for LL and CO chondrules imply either: (1) temporally constant magnetic fields of ${34}_{-14}^{+36}$ μ T and ${106}_{-18}^{+88}$ μ T, respectively; or (2) time-varying magnetic fields with peak amplitudes between ${49}_{-21}^{+97}$ μ T and ${128}_{-11}^{+307}$ μ T. Considering the known mechanisms for sustaining magnetic field gradients and high-amplitude temporal magnetic fluctuations in the solar nebula, we find that magnetic field flux concentrations in disk gaps or time-varying magnetic fields, for example due to the Hall shear instability, are most compatible with the existing data. Using this statistical framework, future paleointensity studies of chondrules can be used to directly test for the variability of magnetic fields in the solar system protoplanetary disk and to distinguish between these scenarios.https://doi.org/10.3847/PSJ/ace716Protoplanetary disksPlanetary system formationAsteroid dynamicsChondritesChondrulesMagnetic fields |
| spellingShingle | Roger R. Fu Sarah C. Steele Jacob B. Simon Richard Teague Joan Najita David Rea Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism The Planetary Science Journal Protoplanetary disks Planetary system formation Asteroid dynamics Chondrites Chondrules Magnetic fields |
| title | Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism |
| title_full | Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism |
| title_fullStr | Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism |
| title_full_unstemmed | Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism |
| title_short | Implications for Chondrule Formation Regions and Solar Nebula Magnetism from Statistical Reanalysis of Chondrule Paleomagnetism |
| title_sort | implications for chondrule formation regions and solar nebula magnetism from statistical reanalysis of chondrule paleomagnetism |
| topic | Protoplanetary disks Planetary system formation Asteroid dynamics Chondrites Chondrules Magnetic fields |
| url | https://doi.org/10.3847/PSJ/ace716 |
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