publication . Article . Preprint . 2017

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.; ...
Open Access English
  • Published: 01 Jan 2017
  • Publisher: HAL CCSD
Abstract
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.
Comment: 12 pages, 5 figures. Accepted for publication in ApJ
Persistent Identifiers
Subjects
arXiv: Astrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary Astrophysics
free text keywords: [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Space and Planetary Science, Astronomy and Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], QB, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies, Captura radioativa de nêutrons, Metalicidade, Composicao estelar, Nucleosíntese, abundances [galaxies], dwarf [Galaxies], abundances [Stars], chemically peculiar [Stars], Readable tables, machine [Supporting material], Stars, Abundance (ecology), Milky Way, Physics, Astrophysics, r-process, Dwarf galaxy, Halo, Star (graph theory)
Funded by
NSF| Collaborative Research: The Dark Energy Survey Data Management Operations
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1138766
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
,
EC| COSMICDAWN
Project
COSMICDAWN
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
,
EC| FN-COLLAGEN
Project
FN-COLLAGEN
Structural Studies on the Interaction of Fibronectin and Collagen
  • Funder: European Commission (EC)
  • Project Code: 235532
  • Funding stream: FP7 | SP3 | PEOPLE
,
EC| COGS
Project
COGS
Capitalizing on Gravitational Shear
  • Funder: European Commission (EC)
  • Project Code: 240672
  • Funding stream: FP7 | SP2 | ERC
,
NSF| Fossils of Reionization: The Search for the Most Metal-Poor Stars in the Local Group
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1108811
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
18 references, page 1 of 2

Aoki, W., Beers, T. C., Christlieb, N., et al. 2007, ApJ, 655, 492 Arcones, A., Janka, H. D., & Scheck, L. 2007, A&A, 467, 1227 Arcones, A., & Thielemann, F. K. 2013, JPhG, 40, 013201 Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, ARA&A, 47, 481 Barklem, P. S., Christlieb, N., Beers, T. C., et al. 2005, A&A, 439, 129 Bauswein, A., Goriely, S., & Janka, H. T. 2013, ApJ, 773, 78 Bechtol, K., Drlica-Wagner, A., Balbinot, E., et al. 2015, ApJ, 807, 50 Beers, T. C., & Christlieb, N. 2005, ARA&A, 43, 531 Bernstein, R., Shectman, S. A., Gunnels, S. M., Mochnacki, S., & Athey, A. E. 2003, Proc. SPIE, 4841, 1694

Bressan, A., Marigo, P., Girardi, L., et al. 2012, MNRAS, 427, 127 Cameron, A. G. W. 2003, ApJ, 587, 327

Carney, B. W., Latham, D. W., Stefanik, R. P., et al. 2003, AJ, 125, 293 Castelli, F., & Kurucz, R. L. 2003, in IAU Symp. 210, Modelling of Stellar Atmospheres, ed. N. Piskunov, W. W. Weiss, & D. F. Gray (San Francisco, CA: ASP), A20

Chubak, C., Marcy, G., Fischer, D. A., et al. 2012, arXiv:1207.6212 Cohen, J. G., & Huang, W. 2009, ApJ, 701, 1053

Cohen, J. G., & Huang, W. 2010, ApJ, 719, 931

Dotter, A., Chaboyer, B., Jevremović, D., et al. 2008, ApJS, 178, 89 Drlica-Wagner, A., Bechtol, K., Rykoff, E. S., et al. 2015, ApJ, 813, 109 Flaugher, B., Diehl, H. T., Honscheid, K., et al. 2015, AJ, 150, 150 François, P., Monaco, L., Bonifacio, P., et al. 2016, A&A, 588, A7 Frebel, A., Casey, A. R., Jacobsen, H. R., & Yo, Q. 2013, ApJ, 769, 57 Freiburghaus, C., Rosswog, S., & Thielemann, F. K. 1999, ApJL, 525, L121 Fuhr, J. R., & Wiese, W. L. 2009, in Atomic Transition Probabilities, ed. D. R. Lide (90th ed.; Boca Raton, FL: CRC Press), 10 Fujimoto, S. I., Nishimura, N., & Hashimoto, M. A. 2008, ApJ, 680, 1350 Fulbright, J. P., Rich, R. M., & Castro, S. 2004, ApJ, 612, 447 Geisler, D., Smith, V. V., Wallerstein, G., Gonzales, G., & Charbonnel, C. 2005, AJ, 129, 1428

Goriely, S., Bauswein, A., & Janka, H. T. 2011, ApJL, 738, L32 Gratton, R., Sneden, C., & Carretta, E. 2004, ARA&A, 42, 385 Griffen, B. F., Dooley, G. A., Ji, A. P., et al. 2016, MNRAS, submitted (arXiv:1611.00759)

Hansen, T., Andersen, J., Nordström, B., et al. 2015, A&A, 583, A49 Hansen, T., Andersen, J., Nordström, B., Buchhave, L. A., & Beers, T. C. 2011, ApJL, 743, L1

Hill, V., Plez, B., Cayrel, R., et al. 2002, A&A, 387, 560 Jablonka, P., North, P., Mashonkina, L., et al. 2015, A&A, 583, A67 Ji, A. P., Frebel, A., Chiti, A., & Simon, J. D. 2016a, Natur, 531, 610 Ji, A. P., Frebel, A., Simon, J. D., & Chiti, A. 2016b, ApJ, 830, 93 Johnson, C. I., McWilliam, A., & Rich, R. M. 2013, ApJL, 775, L27 Kelson, D. D. 2003, PASP, 115, 688

Kirby, E. N., & Cohen, J. G. 2012, AJ, 144, 168

Komiya, Y., & Shigemeyama, T. 2016, ApJ, 830, 76 Koposov, S. E., Belokurov, V., Torrealba, G., & Evans, N. W. 2015, ApJ, 805, 130

Korobkin, O., Rosswog, S., Arcones, A., & Winteler, C. 2012, MNRAS, 426, 1940

Lattimer, J. M., & Schramm, D. N. 1974, ApJL, 192, L145 Lemasle, B., de Boer, T. J. L., Hill, V., et al. 2014, A&A, 572, A88 Letarte, B., Hill, V., Tolstoy, E., et al. 2010, A&A, 523, A17 Masseron, T., Plez, B., Van Eck, S., et al. 2014, A&A, 571, A47 McWilliam, A., Preston, G. W., Sneden, C., & Searle, L. 1995, AJ, 109, 2757 McWilliam, A., Wallerstein, G., & Mottini, M. 2013, ApJ, 778, 149 Metzger, B. D., Martínez-Pinedo, G., Darbha, S., et al. 2010, MNRAS, 406, 2650

Meyer, B. S. 1989, ApJ, 343, 254

Peñarrubia, J., Navarro, J. F., & McConnachie, A. W. 2008, ApJ, 673, 226 Placco, V. M., Frebel, A., Beers, T. C., & Stancliffe, R. J. 2014, ApJ, 797, 21 Qian, Y.-Z., & Wasserburg, G. 2001, ApJL, 552, L55 Ramírez, I., Allende Prieto, C., & Lambert, D. L. 2013, ApJ, 764, 78 Roederer, I. U., Cowan, J. J., Preston, G. W., et al. 2014b, MNRAS, 445, 2970 Roederer, I. U., Marino, A. F., & Sneden, C. 2011, ApJ, 742, 37 Roederer, I. U., Mateo, M., Bailey, J. I., III, et al. 2016, AJ, 151, 82 Roederer, I. U., Preston, G. W., Thompson, I. B., et al. 2014, AJ, 147, 136 Rosswog, S., Korobkin, O., Arcones, A., Thielemann, F. K., & Piran, T. 2014, MNRAS, 439, 744

18 references, page 1 of 2
1 research outcomes, page 1 of 1
Abstract
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.
Comment: 12 pages, 5 figures. Accepted for publication in ApJ
Persistent Identifiers
Subjects
arXiv: Astrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary Astrophysics
free text keywords: [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Space and Planetary Science, Astronomy and Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], QB, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies, Captura radioativa de nêutrons, Metalicidade, Composicao estelar, Nucleosíntese, abundances [galaxies], dwarf [Galaxies], abundances [Stars], chemically peculiar [Stars], Readable tables, machine [Supporting material], Stars, Abundance (ecology), Milky Way, Physics, Astrophysics, r-process, Dwarf galaxy, Halo, Star (graph theory)
Funded by
NSF| Collaborative Research: The Dark Energy Survey Data Management Operations
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1138766
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
,
EC| COSMICDAWN
Project
COSMICDAWN
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
,
EC| FN-COLLAGEN
Project
FN-COLLAGEN
Structural Studies on the Interaction of Fibronectin and Collagen
  • Funder: European Commission (EC)
  • Project Code: 235532
  • Funding stream: FP7 | SP3 | PEOPLE
,
EC| COGS
Project
COGS
Capitalizing on Gravitational Shear
  • Funder: European Commission (EC)
  • Project Code: 240672
  • Funding stream: FP7 | SP2 | ERC
,
NSF| Fossils of Reionization: The Search for the Most Metal-Poor Stars in the Local Group
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1108811
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
18 references, page 1 of 2

Aoki, W., Beers, T. C., Christlieb, N., et al. 2007, ApJ, 655, 492 Arcones, A., Janka, H. D., & Scheck, L. 2007, A&A, 467, 1227 Arcones, A., & Thielemann, F. K. 2013, JPhG, 40, 013201 Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, ARA&A, 47, 481 Barklem, P. S., Christlieb, N., Beers, T. C., et al. 2005, A&A, 439, 129 Bauswein, A., Goriely, S., & Janka, H. T. 2013, ApJ, 773, 78 Bechtol, K., Drlica-Wagner, A., Balbinot, E., et al. 2015, ApJ, 807, 50 Beers, T. C., & Christlieb, N. 2005, ARA&A, 43, 531 Bernstein, R., Shectman, S. A., Gunnels, S. M., Mochnacki, S., & Athey, A. E. 2003, Proc. SPIE, 4841, 1694

Bressan, A., Marigo, P., Girardi, L., et al. 2012, MNRAS, 427, 127 Cameron, A. G. W. 2003, ApJ, 587, 327

Carney, B. W., Latham, D. W., Stefanik, R. P., et al. 2003, AJ, 125, 293 Castelli, F., & Kurucz, R. L. 2003, in IAU Symp. 210, Modelling of Stellar Atmospheres, ed. N. Piskunov, W. W. Weiss, & D. F. Gray (San Francisco, CA: ASP), A20

Chubak, C., Marcy, G., Fischer, D. A., et al. 2012, arXiv:1207.6212 Cohen, J. G., & Huang, W. 2009, ApJ, 701, 1053

Cohen, J. G., & Huang, W. 2010, ApJ, 719, 931

Dotter, A., Chaboyer, B., Jevremović, D., et al. 2008, ApJS, 178, 89 Drlica-Wagner, A., Bechtol, K., Rykoff, E. S., et al. 2015, ApJ, 813, 109 Flaugher, B., Diehl, H. T., Honscheid, K., et al. 2015, AJ, 150, 150 François, P., Monaco, L., Bonifacio, P., et al. 2016, A&A, 588, A7 Frebel, A., Casey, A. R., Jacobsen, H. R., & Yo, Q. 2013, ApJ, 769, 57 Freiburghaus, C., Rosswog, S., & Thielemann, F. K. 1999, ApJL, 525, L121 Fuhr, J. R., & Wiese, W. L. 2009, in Atomic Transition Probabilities, ed. D. R. Lide (90th ed.; Boca Raton, FL: CRC Press), 10 Fujimoto, S. I., Nishimura, N., & Hashimoto, M. A. 2008, ApJ, 680, 1350 Fulbright, J. P., Rich, R. M., & Castro, S. 2004, ApJ, 612, 447 Geisler, D., Smith, V. V., Wallerstein, G., Gonzales, G., & Charbonnel, C. 2005, AJ, 129, 1428

Goriely, S., Bauswein, A., & Janka, H. T. 2011, ApJL, 738, L32 Gratton, R., Sneden, C., & Carretta, E. 2004, ARA&A, 42, 385 Griffen, B. F., Dooley, G. A., Ji, A. P., et al. 2016, MNRAS, submitted (arXiv:1611.00759)

Hansen, T., Andersen, J., Nordström, B., et al. 2015, A&A, 583, A49 Hansen, T., Andersen, J., Nordström, B., Buchhave, L. A., & Beers, T. C. 2011, ApJL, 743, L1

Hill, V., Plez, B., Cayrel, R., et al. 2002, A&A, 387, 560 Jablonka, P., North, P., Mashonkina, L., et al. 2015, A&A, 583, A67 Ji, A. P., Frebel, A., Chiti, A., & Simon, J. D. 2016a, Natur, 531, 610 Ji, A. P., Frebel, A., Simon, J. D., & Chiti, A. 2016b, ApJ, 830, 93 Johnson, C. I., McWilliam, A., & Rich, R. M. 2013, ApJL, 775, L27 Kelson, D. D. 2003, PASP, 115, 688

Kirby, E. N., & Cohen, J. G. 2012, AJ, 144, 168

Komiya, Y., & Shigemeyama, T. 2016, ApJ, 830, 76 Koposov, S. E., Belokurov, V., Torrealba, G., & Evans, N. W. 2015, ApJ, 805, 130

Korobkin, O., Rosswog, S., Arcones, A., & Winteler, C. 2012, MNRAS, 426, 1940

Lattimer, J. M., & Schramm, D. N. 1974, ApJL, 192, L145 Lemasle, B., de Boer, T. J. L., Hill, V., et al. 2014, A&A, 572, A88 Letarte, B., Hill, V., Tolstoy, E., et al. 2010, A&A, 523, A17 Masseron, T., Plez, B., Van Eck, S., et al. 2014, A&A, 571, A47 McWilliam, A., Preston, G. W., Sneden, C., & Searle, L. 1995, AJ, 109, 2757 McWilliam, A., Wallerstein, G., & Mottini, M. 2013, ApJ, 778, 149 Metzger, B. D., Martínez-Pinedo, G., Darbha, S., et al. 2010, MNRAS, 406, 2650

Meyer, B. S. 1989, ApJ, 343, 254

Peñarrubia, J., Navarro, J. F., & McConnachie, A. W. 2008, ApJ, 673, 226 Placco, V. M., Frebel, A., Beers, T. C., & Stancliffe, R. J. 2014, ApJ, 797, 21 Qian, Y.-Z., & Wasserburg, G. 2001, ApJL, 552, L55 Ramírez, I., Allende Prieto, C., & Lambert, D. L. 2013, ApJ, 764, 78 Roederer, I. U., Cowan, J. J., Preston, G. W., et al. 2014b, MNRAS, 445, 2970 Roederer, I. U., Marino, A. F., & Sneden, C. 2011, ApJ, 742, 37 Roederer, I. U., Mateo, M., Bailey, J. I., III, et al. 2016, AJ, 151, 82 Roederer, I. U., Preston, G. W., Thompson, I. B., et al. 2014, AJ, 147, 136 Rosswog, S., Korobkin, O., Arcones, A., Thielemann, F. K., & Piran, T. 2014, MNRAS, 439, 744

18 references, page 1 of 2
1 research outcomes, page 1 of 1
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