The Dependence of Iron-rich Metal-poor Star Occurrence on Galactic Environment Supports an Origin in Thermonuclear Supernova Nucleosynthesis

Reeves, Zachary; Schlaufman, Kevin C.; Reggiani, Henrique

doi:10.3847/1538-3881/ace68d

The Dependence of Iron-rich Metal-poor Star Occurrence on Galactic Environment Supports an Origin in Thermonuclear Supernova Nucleosynthesis

Journal Article · Fri Aug 25 00:00:00 EDT 2023 · The Astronomical Journal

DOI:https://doi.org/10.3847/1538-3881/ace68d· OSTI ID:2425326

^[1]; ^[1]; ^[2]

Johns Hopkins Univ., Baltimore, MD (United States)
Carnegie Observatories, Pasadena, CA (United States)

It has been suggested that a class of chemically peculiar metal-poor stars called iron-rich metal-poor (IRMP) stars formed from molecular cores with metal contents dominated by thermonuclear supernova nucleosynthesis. If this interpretation is accurate, then IRMP stars should be more common in environments where thermonuclear supernovae were important contributors to chemical evolution. Conversely, IRMP stars should be less common in environments where thermonuclear supernovae were not important contributors to chemical evolution. At constant [Fe/H] ≲ -1, the Milky Way's satellite classical dwarf spheroidal (dSph) galaxies and the Magellanic Clouds have lower [α/Fe] than the Milky Way field and globular cluster populations. This difference is thought to demonstrate the importance of thermonuclear supernova nucleosynthesis for the chemical evolution of the Milky Way's satellite classical dSph galaxies and the Magellanic Clouds. We use data from the Sloan Digital Sky Survey Apache Point Observatory Galactic Evolution Experiment and Gaia to infer the occurrence of IRMP stars in the Milky Way's satellite classical dSph galaxies η_dSph and the Magellanic Clouds η_Mag, as well as in the Milky Way field η_MWF and globular cluster populations η_MWGC. In order of decreasing occurrence, we find η_dSph = $0.07$$$$^{+0.02}_{-0.02}$$, η_Mag = $0.037$$$$^{+0.007}_{-0.006}$$, η_MWF = $0.0013$$$$^{+0.0006}_{-0.0005}$$, and a 1σ upper limit η_MWGC < 0.00057. These occurrences support the inference that IRMP stars formed in environments dominated by thermonuclear supernova nucleosynthesis and that the time lag between the formation of the first and second stellar generations in globular clusters was longer than the thermonuclear supernova delay time.

View Accepted Manuscript (DOE)

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 2425326

Journal Information:: The Astronomical Journal, Journal Name: The Astronomical Journal Journal Issue: 3 Vol. 166; ISSN 0004-6256

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Aspcap: the Apogee Stellar Parameter and Chemical Abundances Pipeline García Pérez, Ana E.; Prieto, Carlos Allende; Holtzman, Jon A. The Astronomical Journal, Vol. 151, Issue 6 https://doi.org/10.3847/0004-6256/151/6/144	journal	May 2016
Core-Collapse Supernovae from 9 to 120 Solar Masses Based on Neutrino-Powered Explosions Sukhbold, Tuguldur; Ertl, T.; Woosley, S. E. The Astrophysical Journal, Vol. 821, Issue 1 https://doi.org/10.3847/0004-637X/821/1/38	journal	April 2016
Supernovae from Direct Collisions of White Dwarfs and the role of Helium Shell Ignition Papish, Oded; Perets, Hagai Binyamin The Astrophysical Journal, Vol. 822, Issue 1 https://doi.org/10.3847/0004-637X/822/1/19	journal	April 2016
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Mesa Isochrones and Stellar Tracks (Mist) 0: Methods for the Construction of Stellar Isochrones Dotter, Aaron The Astrophysical Journal Supplement Series, Vol. 222, Issue 1 https://doi.org/10.3847/0067-0049/222/1/8	journal	January 2016
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Target Selection for the SDSS-IV APOGEE-2 Survey Zasowski, G.; Cohen, R. E.; Chojnowski, S. D. The Astronomical Journal, Vol. 154, Issue 5 https://doi.org/10.3847/1538-3881/aa8df9	journal	October 2017
The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package Price-Whelan, A. M.; Sipőcz, B. M.; Günther, H. M. The Astronomical Journal, Vol. 156, Issue 3 https://doi.org/10.3847/1538-3881/aabc4f	journal	August 2018
Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2 Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M. The Astronomical Journal, Vol. 156, Issue 2 https://doi.org/10.3847/1538-3881/aacb21	journal	July 2018
APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South Jönsson, Henrik; Holtzman, Jon A.; Prieto, Carlos Allende The Astronomical Journal, Vol. 160, Issue 3 https://doi.org/10.3847/1538-3881/aba592	journal	August 2020
Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3 Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M. The Astronomical Journal, Vol. 161, Issue 3 https://doi.org/10.3847/1538-3881/abd806	journal	February 2021
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The Most Metal-poor Stars in the Magellanic Clouds Are r-process Enhanced* Reggiani, Henrique; Schlaufman, Kevin C.; Casey, Andrew R. The Astronomical Journal, Vol. 162, Issue 6 https://doi.org/10.3847/1538-3881/ac1f9a	journal	November 2021
Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey Beaton, Rachael L.; Oelkers, Ryan J.; Hayes, Christian R. The Astronomical Journal, Vol. 162, Issue 6 https://doi.org/10.3847/1538-3881/ac260c	journal	December 2021
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The R -process Alliance: First Release from the Southern Search for R -process-enhanced Stars in the Galactic Halo Hansen, Terese T.; Holmbeck, Erika M.; Beers, Timothy C. The Astrophysical Journal, Vol. 858, Issue 2 https://doi.org/10.3847/1538-4357/aabacc	journal	May 2018
Explosive Nucleosynthesis in Near-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters Leung, Shing-Chi; Nomoto, Ken’ichi The Astrophysical Journal, Vol. 861, Issue 2 https://doi.org/10.3847/1538-4357/aac2df	journal	July 2018
The R -Process Alliance: First Release from the Northern Search for r -process-enhanced Metal-poor Stars in the Galactic Halo Sakari, Charli M.; Placco, Vinicius M.; Farrell, Elizabeth M. The Astrophysical Journal, Vol. 868, Issue 2 https://doi.org/10.3847/1538-4357/aae9df	journal	November 2018
Explosive Nucleosynthesis in Sub-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters Leung, Shing-Chi; Nomoto, Ken’ichi The Astrophysical Journal, Vol. 888, Issue 2 https://doi.org/10.3847/1538-4357/ab5c1f	journal	January 2020
The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds Nidever, David L.; Hasselquist, Sten; Hayes, Christian R. The Astrophysical Journal, Vol. 895, Issue 2 https://doi.org/10.3847/1538-4357/ab7305	journal	May 2020
The R -Process Alliance: First Magellan/MIKE Release from the Southern Search for R -process-enhanced Stars Ezzeddine, Rana; Rasmussen, Kaitlin; Frebel, Anna The Astrophysical Journal, Vol. 898, Issue 2 https://doi.org/10.3847/1538-4357/ab9d1a	journal	August 2020
Explosive Nucleosynthesis in Near-Chandrasekhar Mass White Dwarf Models for Type Iax Supernovae: Dependence on Model Parameters Leung, Shing-Chi; Nomoto, Ken’ichi The Astrophysical Journal, Vol. 900, Issue 1 https://doi.org/10.3847/1538-4357/aba1e3	journal	August 2020
Multidimensional Parameter Study of Double Detonation Type Ia Supernovae Originating from Thin Helium Shell White Dwarfs Boos, Samuel J.; Townsley, Dean M.; Shen, Ken J. The Astrophysical Journal, Vol. 919, Issue 2 https://doi.org/10.3847/1538-4357/ac07a2	journal	October 2021
Near-Chandrasekhar-mass Type Ia Supernovae from the Double-degenerate Channel Neopane, Sudarshan; Bhargava, Khanak; Fisher, Robert The Astrophysical Journal, Vol. 925, Issue 1 https://doi.org/10.3847/1538-4357/ac3b52	journal	January 2022
Modules for Experiments in Stellar Astrophysics (${\mathtt{M}}{\mathtt{E}}{\mathtt{S}}{\mathtt{A}}$): Convective Boundaries, Element Diffusion, and Massive Star Explosions Paxton, Bill; Schwab, Josiah; Bauer, Evan B. The Astrophysical Journal Supplement Series, Vol. 234, Issue 2 https://doi.org/10.3847/1538-4365/aaa5a8	journal	February 2018
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pandas-dev/pandas: Pandas No authors listed https://doi.org/10.5281/zenodo.3509134	software	January 2024

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