Chemical Abundance Analysis of Tucana III, the Second r -process Enhanced Ultra-faint Dwarf Galaxy

Marshall, J. L.; Hansen, T.; Simon, J. D.; Li, T. S.; Bernstein, R. A.; Kuehn, K.; Pace, A. B.; DePoy, D. L.; Palmese, A.; Pieres, A.; Strigari, L.; Drlica-Wagner, A.; Bechtol, K.; Lidman, C.; Nagasawa, D. Q.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; D’Andrea, C. B.; Costa, L. N.  da; Vicente, J. De; Desai, S.; Doel, P.; Eifler, T. F.; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Hollowood, D. L.; Honscheid, K.; Hoyle, B.; James, D. J.; Kuropatkin, N.; Maia, M. A.  G.; Menanteau, F.; Miller, C. J.; Miquel, R.; Plazas, A. A.; Sanchez, E.; Santiago, B.; Scarpine, V.; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, I.; Smith, M.; Soares-Santos, M.; Suchyta, E.; Swanson, M. E.  C.; Tarle, G.; Wester, W.

doi:10.3847/1538-4357/ab3653

Title: Chemical Abundance Analysis of Tucana III, the Second r -process Enhanced Ultra-faint Dwarf Galaxy

Journal Article · Mon Sep 16 00:00:00 EDT 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab3653· OSTI ID:1573820

;

; Simon, J. D.; Li, T. S.; Bernstein, R. A.;

;

; DePoy, D. L.;

; Pieres, A.;

;

; Bechtol, K.;

; Nagasawa, D. Q.; Bertin, E.;

; Buckley-Geer, E.; Burke, D. L.; Rosell, A. Carnero more »

We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: they are moderately enhanced in r-process elements, i.e. they have <[Eu/Fe]>≈+0.4 dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in α-elements, i.e., the lower metallicity stars have higher Ca and Ti abundance. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); National Science Foundation (NSF)

Contributing Organization:: DES Collaboration

Grant/Contract Number:: AC02-07CH11359; SC0019193; AC05-00OR22725; AST-1714873; AST-1138766; AST-1536171

OSTI ID:: 1573820

Alternate ID(s):: OSTI ID: 1606733; OSTI ID: 1760472

Report Number(s):: FERMILAB-PUB-18-651-AE; arXiv:1812.01022; arXiv:1812.01022v2; oai:inspirehep.net:1763553; TRN: US2100324

Journal Information:: The Astrophysical Journal (Online), Vol. 882, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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An R-process enhanced star in the dwarf galaxy Tucana III Hansen, T. T.; Simon, J. D.; Marshall, J. L. arXiv https://doi.org/10.48550/arxiv.1702.07430	text	January 2017
Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology Drlica-Wagner, A.; Sevilla-Noarbe, I.; Rykoff, E. S. arXiv https://doi.org/10.48550/arxiv.1708.01531	text	January 2017
Early Spectra of the Gravitational Wave Source GW170817: Evolution of a Neutron Star Merger Shappee, B. J.; Simon, J. D.; Drout, M. R. arXiv https://doi.org/10.48550/arxiv.1710.05432	text	January 2017
Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis Drout, M. R.; Piro, A. L.; Shappee, B. J. arXiv https://doi.org/10.48550/arxiv.1710.05443	text	January 2017
Chemical Abundances of new member stars in the Tucana II dwarf galaxy Chiti, Anirudh; Frebel, Anna; Ji, Alexander P. arXiv https://doi.org/10.48550/arxiv.1803.01808	text	January 2018
Modelling the Tucana III stream - a close passage with the LMC Erkal, D.; Li, T. S.; Koposov, S. E. arXiv https://doi.org/10.48550/arxiv.1804.07762	text	January 2018
Stochastic Chemical Evolution of Galactic Subhalos and the Origin of r-Process Elements Ojima, Takuya; Ishimaru, Yuhri; Wanajo, Shinya arXiv https://doi.org/10.48550/arxiv.1808.03390	text	January 2018
Chemical Abundances in the Ultra-Faint Dwarf Galaxies Grus I and Triangulum II: Neutron-Capture Elements as a Defining Feature of the Faintest Dwarfs Ji, Alexander P.; Simon, Joshua D.; Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1809.02182	text	January 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. arXiv https://doi.org/10.48550/arxiv.1809.09156	text	January 2018
Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants Burris, Debra L.; Pilachowski, Catherine A.; Armandroff, Taft E. arXiv https://doi.org/10.48550/arxiv.astro-ph/0005188	text	January 2000
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

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Neutron star binary orbits in their host potential: effect on early r-process enrichment Bonetti, Matteo; Perego, Albino; Dotti, Massimo Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 1 https://doi.org/10.1093/mnras/stz2554	journal	September 2019
High-resolution Optical Spectroscopy of Stars in the Sylgr Stellar Stream Roederer, Ian U.; Gnedin, Oleg Y. The Astrophysical Journal, Vol. 883, Issue 1 https://doi.org/10.3847/1538-4357/ab365c	journal	September 2019
Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III Ji, A. P.; Li, T. S.; Simon, J. D. The Astrophysical Journal, Vol. 889, Issue 1 https://doi.org/10.3847/1538-4357/ab6213	journal	January 2020
Neutron star binary orbits in their host potential: effect on early r-process enrichment Bonetti, Matteo; Perego, Albino; Dotti, Massimo arXiv https://doi.org/10.48550/arxiv.1905.12016	text	January 2019

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