An r-process enhanced star in the dwarf galaxy Tucana III

Hansen, T. T.; Simon, J. D.; Marshall, J. L.; Li, T. S.; Carollo, D.; DePoy, D. L.; Nagasawa, D. Q.; Bernstein, R. A.; Drlica-Wagner, A.; Abdalla, F. B.; Allam, S.; Annis, J.; Bechtol, K.; Benoit-Lévy, A.; Brooks, D.; Buckley-Geer, E.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; Costa, L. N.  da; Desai, S.; Eifler, T. F.; Neto, A. Fausti; Flaugher, B.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; James, D. J.; Krause, E.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Miquel, R.; Plazas, A. A.; Romer, A. K.; Sanchez, E.; Santiago, B.; Scarpine, V.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E.  C.; Tarle, G.; Walker, A. R.

doi:10.3847/1538-4357/aa634a

Title: An r-process enhanced star in the dwarf galaxy Tucana III

Journal Article · Mon Mar 20 00:00:00 EDT 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa634a· OSTI ID:1349625

; Simon, J. D.;

; Li, T. S.;

; DePoy, D. L.; Nagasawa, D. Q.; Bernstein, R. A.; Drlica-Wagner, A.; Abdalla, F. B.; Allam, S.;

; Bechtol, K.; Benoit-Lévy, A.; Brooks, D.; Buckley-Geer, E.;

; Kind, M. Carrasco; Carretero, J.; Cunha, C. E. more »

Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES J235532.66$$-$$593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the $$r$$-process and can be classified as an $$r$$-I star. DES J235532 is the first $$r$$-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain $$r$$-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with $$r$$-I and $$r$$-II stars found in other dwarf galaxies and in the Milky Way halo suggests a common astrophysical origin for the neutron-capture elements seen in all $$r$$-process enhanced stars. We explore both internal and external scenarios for the $$r$$-process enrichment of Tuc III and show that with abundance patterns for additional stars it should be possible to distinguish between them.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: DES Collaboration

Grant/Contract Number:: AC05-00OR22725; AC02-76SF00515; AC02-07CH11359

OSTI ID:: 1349625

Alternate ID(s):: OSTI ID: 1360754; OSTI ID: 1362064

Report Number(s):: arXiv:1702.07430; FERMILAB-PUB-17-189-AE; KJ0402000; KJ0503000; ERKJ311; ERKJEPM; TRN: US1700595

Journal Information:: The Astrophysical Journal (Online), Vol. 838, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 86 works

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Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy Simon, Joshua D.; Jacobson, Heather R.; Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1412.5176	text	January 2014
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The Dark Energy Survey: more than dark energy - an overview Collaboration, Dark Energy Survey; Abbott, T.; Abdalla, F. B. arXiv https://doi.org/10.48550/arxiv.1601.00329	text	January 2016
Complete element abundances of nine stars in the r-process galaxy Reticulum II Ji, Alexander P.; Frebel, Anna; Simon, Joshua D. arXiv https://doi.org/10.48550/arxiv.1607.07447	text	January 2016
Contribution of Neutron Star Mergers to the R-process Chemical Evolution in the Hierarchical Galaxy Formation Komiya, Yutaka; Shigeyama, Toshikazu arXiv https://doi.org/10.48550/arxiv.1608.01772	text	January 2016
The Extremely Metal-Poor, Neutron-Capture-Rich Star CS 22892-052: A Comprehensive Abundance Analysis Sneden, C.; Cowan, J. J.; Lawler, J. E. arXiv https://doi.org/10.48550/arxiv.astro-ph/0303542	text	January 2003
Subaru/HDS Abundances in Three Giant Stars in the Ursa Minor Dwarf Spheroidal Galaxy Sadakane, K.; Arimoto, N.; Ikuta, C. arXiv https://doi.org/10.48550/arxiv.astro-ph/0411332	text	January 2004
'Sculptor'-ing the Galaxy? The Chemical Compositions of Red Giants in the Sculptor Dwarf Spheroidal Galaxy Geisler, Doug; Smith, Verne V.; Wallerstein, George arXiv https://doi.org/10.48550/arxiv.astro-ph/0412065	text	January 2004
The Hamburg/ESO R-process Enhanced Star survey (HERES) II. Spectroscopic analysis of the survey sample Barklem, P. S.; Christlieb, N.; Beers, T. C. arXiv https://doi.org/10.48550/arxiv.astro-ph/0505050	text	January 2005
Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars Aoki, Wako; Beers, Timothy C.; Christlieb, Norbert arXiv https://doi.org/10.48550/arxiv.astro-ph/0609702	text	January 2006

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