Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754
This study presents a comprehensive chemodynamical analysis of LAMOST J1109+0754, a bright (V = 12.8), extremely metal-poor ([Fe/H] = -3.17) star, with a strong r-process enhancement ([Eu/Fe] = +0.94 ± 0.12). Our results are based on the 7D measurements supplied by Gaia and the chemical composition...
| Main Authors: | , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Astronomical Society
2022
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| Online Access: | https://hdl.handle.net/1721.1/141831 |
| _version_ | 1826189362372542464 |
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| author | Mardini, Mohammad K Placco, Vinicius M Meiron, Yohai Ishchenko, Marina Avramov, Branislav Mazzarini, Matteo Berczik, Peter Sedda, Manuel Arca Beers, Timothy C Frebel, Anna Taani, Ali Donnari, Martina Al-Wardat, Mashhoor A Zhao, Gang |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Mardini, Mohammad K Placco, Vinicius M Meiron, Yohai Ishchenko, Marina Avramov, Branislav Mazzarini, Matteo Berczik, Peter Sedda, Manuel Arca Beers, Timothy C Frebel, Anna Taani, Ali Donnari, Martina Al-Wardat, Mashhoor A Zhao, Gang |
| author_sort | Mardini, Mohammad K |
| collection | MIT |
| description | This study presents a comprehensive chemodynamical analysis of LAMOST J1109+0754, a bright (V = 12.8), extremely metal-poor ([Fe/H] = -3.17) star, with a strong r-process enhancement ([Eu/Fe] = +0.94 ± 0.12). Our results are based on the 7D measurements supplied by Gaia and the chemical composition derived from a high-resolution (R ∼ 110,000), high signal-to-noise ratio (S N ∼ 60) optical spectrum obtained by the 2.4 m Automated Planet Finder Telescope at Lick Observatory. We obtain chemical abundances of 31 elements (from lithium to thorium). The abundance ratios ([X/Fe]) of the light elements (Z ≤ 30) suggest a massive Population III progenitor in the 13.4-29.5M⊙ mass range. The heavy-element (30 < Z ≤ 90) abundance pattern of J1109+075 agrees extremely well with the scaled-solar r-process signature. We have developed a novel approach to trace the kinematic history and orbital evolution of J1109+0754 with a cOsmologically deRIved timE-varyiNg Galactic poTential (the ORIENT) constructed from snapshots of a simulated Milky Way analog taken from the Illustris-TNG simulation. The orbital evolution within this Milky Way-like galaxy, along with the chemical abundance pattern, implies that J1109+0754 likely originated in a low-mass dwarf galaxy located ∼60 kpc from the center of the Galaxy, which was accreted ∼6-7 Gyr ago, and that the star now belongs to the outer-halo population. |
| first_indexed | 2024-09-23T08:13:52Z |
| format | Article |
| id | mit-1721.1/141831 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:13:52Z |
| publishDate | 2022 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1418312023-07-28T20:47:45Z Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 Mardini, Mohammad K Placco, Vinicius M Meiron, Yohai Ishchenko, Marina Avramov, Branislav Mazzarini, Matteo Berczik, Peter Sedda, Manuel Arca Beers, Timothy C Frebel, Anna Taani, Ali Donnari, Martina Al-Wardat, Mashhoor A Zhao, Gang Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research This study presents a comprehensive chemodynamical analysis of LAMOST J1109+0754, a bright (V = 12.8), extremely metal-poor ([Fe/H] = -3.17) star, with a strong r-process enhancement ([Eu/Fe] = +0.94 ± 0.12). Our results are based on the 7D measurements supplied by Gaia and the chemical composition derived from a high-resolution (R ∼ 110,000), high signal-to-noise ratio (S N ∼ 60) optical spectrum obtained by the 2.4 m Automated Planet Finder Telescope at Lick Observatory. We obtain chemical abundances of 31 elements (from lithium to thorium). The abundance ratios ([X/Fe]) of the light elements (Z ≤ 30) suggest a massive Population III progenitor in the 13.4-29.5M⊙ mass range. The heavy-element (30 < Z ≤ 90) abundance pattern of J1109+075 agrees extremely well with the scaled-solar r-process signature. We have developed a novel approach to trace the kinematic history and orbital evolution of J1109+0754 with a cOsmologically deRIved timE-varyiNg Galactic poTential (the ORIENT) constructed from snapshots of a simulated Milky Way analog taken from the Illustris-TNG simulation. The orbital evolution within this Milky Way-like galaxy, along with the chemical abundance pattern, implies that J1109+0754 likely originated in a low-mass dwarf galaxy located ∼60 kpc from the center of the Galaxy, which was accreted ∼6-7 Gyr ago, and that the star now belongs to the outer-halo population. 2022-04-11T18:24:40Z 2022-04-11T18:24:40Z 2020 2022-04-11T18:08:06Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/141831 Mardini, Mohammad K, Placco, Vinicius M, Meiron, Yohai, Ishchenko, Marina, Avramov, Branislav et al. 2020. "Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754." Astrophysical Journal, 903 (2). en 10.3847/1538-4357/ABBC13 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | Mardini, Mohammad K Placco, Vinicius M Meiron, Yohai Ishchenko, Marina Avramov, Branislav Mazzarini, Matteo Berczik, Peter Sedda, Manuel Arca Beers, Timothy C Frebel, Anna Taani, Ali Donnari, Martina Al-Wardat, Mashhoor A Zhao, Gang Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
| title | Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
| title_full | Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
| title_fullStr | Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
| title_full_unstemmed | Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
| title_short | Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
| title_sort | cosmological insights into the early accretion of r process enhanced stars i a comprehensive chemodynamical analysis of lamost j1109 0754 |
| url | https://hdl.handle.net/1721.1/141831 |
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