The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5-455510

Placco, Vinicius M.; Santucci, Rafael M.; Yuan, Zhen; Mardini, Mohammad K.; Holmbeck, Erika M.; Wang, Xilu; Surman, Rebecca; Hansen, Terese T.; Roederer, Ian U.; Beers, Timothy C.; Choplin, Arthur; Ji, Alexander P.; Ezzeddine, Rana; Frebel, Anna; Sakari, Charli M.; Whitten, Devin D.; Zepeda, Joseph

doi:10.3847/1538-4357/ab99c6

The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5-455510

Journal Article · Mon Jul 06 00:00:00 EDT 2020 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab99c6· OSTI ID:1800836

^[1]; ^[2]; ^[3]; ^[4]; ^[5]; ^[6]; ^[5]; ^[7]; ^[8]; ^[5]; ^[9]; ^[10]; ^[11]; ^[12]; ^[13]; ^[5]; ^[5]

Univ. of Notre Dame, Notre Dame, IN (United States). Dept. of Physics; JINA Center for the Evolution of the Elements (United States); University of Notre Dame
Universidade Federal de Goiás, Goiânia, GO (Brazil)
Chinese Academy of Sciences (CAS), Shanghai (China)
Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
Univ. of Notre Dame, Notre Dame, IN (United States). Dept. of Physics; JINA Center for the Evolution of the Elements (United States)
Univ. of Notre Dame, Notre Dame, IN (United States). Dept. of Physics; JINA Center for the Evolution of the Elements (United States); Univ. of California, Berkeley, CA (United States). Dept. of Physics
Texas A & M University, College Station, TX (United States). Mitchell Institute for Fundamental Physics and Astronomy and Dept. of Physics and Astronomy
JINA Center for the Evolution of the Elements (United States); Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Astronomy
Konan University, Kobe, Hyogo (Japan). Dept. of Physics, Faculty of Science and Engineering; University of Geneva, Sauverny (Switzerland). Geneva Observatory
Observatories of the Carnegie Institution for Science, Pasadena, CA (United States)
Univ. of Florida, Gainesville, FL (United States). Bryant Space Science Center and Dept. of Astronomy
JINA Center for the Evolution of the Elements (United States); Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Physics and Kavli Institute for Astrophysics and Space Research
San Francisco State Univ., San Francisco, CA (United States). Dept. of Physics & Astronomy

In this work, we report on the spectroscopic analysis of RAVE J183013.5-455510, an extremely metal-poor star, highly enhanced in CNO, and with discernible contributions from the rapid neutron-capture process. There is no evidence of binarity for this object. At [Fe/H] = –3.57, this star has one of the lowest metallicities currently observed, with 18 measured abundances of neutron-capture elements. The presence of Ba, La, and Ce abundances above the solar system $$\textit{r}$$-process predictions suggests that there must have been a non-standard source of $$\textit{r}$$-process elements operating at such low metallicities. One plausible explanation is that this enhancement originates from material ejected at unusually high velocities in a neutron star merger event. We also explore the possibility that the neutron-capture elements were produced during the evolution and explosion of a rotating massive star. In addition, based on comparisons with yields from zero-metallicity faint supernova, we speculate that RAVE J1830-4555 was formed from a gas cloud pre-enriched by both progenitor types. From analysis based on Gaia DR2 measurements, we show that this star has orbital properties similar to the Galactic metal-weak thick-disk stellar population.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Notre Dame, IN (United States)

Sponsoring Organization:: Brazilian National Council for Scientific and Technological Development (CNPq); Coordination for the Improvement of Higher Education Personnel (CAPES); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Swiss National Science Foundation (SNF); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-95ER40934

OSTI ID:: 1800836

Alternate ID(s):: OSTI ID: 23025096

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 897; ISSN 1538-4357

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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New s -process Mechanism in Rapidly Rotating Massive Population II Stars Banerjee, Projjwal; Heger, Alexander; Qian, Yong-Zhong The Astrophysical Journal, Vol. 887, Issue 2 https://doi.org/10.3847/1538-4357/ab517a	journal	December 2019
Identification of a Group III CEMP-no Star in the Dwarf Spheroidal Galaxy Canes Venatici I Yoon, Jinmi; Whitten, Devin D.; Beers, Timothy C. The Astrophysical Journal, Vol. 894, Issue 1 https://doi.org/10.3847/1538-4357/ab7daf	journal	April 2020
Sandblasting the r -process: Spallation of Ejecta from Neutron Star Mergers Wang, Xilu; Fields, Brian D.; Mumpower, Matthew The Astrophysical Journal, Vol. 893, Issue 2 https://doi.org/10.3847/1538-4357/ab7ffd	journal	April 2020
Presupernova Evolution and Explosive Nucleosynthesis of Rotating Massive Stars in the Metallicity Range −3 ≤ [Fe/H] ≤ 0 Limongi, Marco; Chieffi, Alessandro The Astrophysical Journal Supplement Series, Vol. 237, Issue 1 https://doi.org/10.3847/1538-4365/aacb24	journal	July 2018
JINAbase—A Database for Chemical Abundances of Metal-poor Stars Abohalima, Abdu; Frebel, Anna The Astrophysical Journal Supplement Series, Vol. 238, Issue 2 https://doi.org/10.3847/1538-4365/aadfe9	journal	October 2018
Detection of Phosphorus, Sulphur, and zinc in the Carbon-Enhanced Metal-Poor star Bd+44 493 Roederer, Ian U.; Placco, Vinicius M.; Beers, Timothy C. The Astrophysical Journal, Vol. 824, Issue 2 https://doi.org/10.3847/2041-8205/824/2/L19	journal	June 2016
G64-12 and G64-37 are Carbon-Enhanced Metal-Poor Stars Placco, Vinicius M.; Beers, Timothy C.; Reggiani, Henrique The Astrophysical Journal, Vol. 829, Issue 2 https://doi.org/10.3847/2041-8205/829/2/L24	journal	September 2016
Multi-messenger Observations of a Binary Neutron Star Merger Abbott, B. P.; Abbott, R.; Abbott, T. D. The Astrophysical Journal, Vol. 848, Issue 2 https://doi.org/10.3847/2041-8213/aa91c9	journal	October 2017
The r -process Pattern of a Bright, Highly r -process-enhanced Metal-poor Halo Star at [Fe/H] ∼ −2 Sakari, Charli M.; Placco, Vinicius M.; Hansen, Terese The Astrophysical Journal, Vol. 854, Issue 2 https://doi.org/10.3847/2041-8213/aaa9b4	journal	February 2018
J0023+0307: A Mega Metal-poor Dwarf Star from SDSS/BOSS Aguado, David S.; Prieto, Carlos Allende; Hernández, Jonay I. González The Astrophysical Journal, Vol. 854, Issue 2 https://doi.org/10.3847/2041-8213/aaadb8	journal	February 2018
The R -Process Alliance: 2MASS J09544277+5246414, the Most Actinide-enhanced R -II Star Known Holmbeck, Erika M.; Beers, Timothy C.; Roederer, Ian U. The Astrophysical Journal, Vol. 859, Issue 2 https://doi.org/10.3847/2041-8213/aac722	journal	June 2018

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