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The Gaia -ESO survey : Placing constraints on the origin of r -process elements

Van Der Swaelmen, M. ; Viscasillas Vázquez, C. ; Cescutti, G. ; Magrini, L. ; Cristallo, S. ; Vescovi, D. ; Randich, S. ; Tautvaišiene, G. ; Bagdonas, V. and Bensby, T. LU orcid , et al. (2023) In Astronomy and Astrophysics 670.
Abstract

Context. A renewed interest in the origin of r-process elements has been stimulated by the multi-messenger observation of the gravitational event GW170817, with the detection of both gravitational waves and electromagnetic waves corresponding to the merger of two neutron stars. Such a phenomenon has been proposed as one of the main sources of the r-process. However, the origin of the r-process elements at different metallicities is still under debate. Aims. We aim at investigate the origin of the r-process elements in the Galactic thin-disc population. Methods. From the sixth internal data release of the Gaia-ESO, we have collected a large sample of Milky Way (MW) thin- and thick-disc stars for which abundances of Eu, O, and Mg are... (More)

Context. A renewed interest in the origin of r-process elements has been stimulated by the multi-messenger observation of the gravitational event GW170817, with the detection of both gravitational waves and electromagnetic waves corresponding to the merger of two neutron stars. Such a phenomenon has been proposed as one of the main sources of the r-process. However, the origin of the r-process elements at different metallicities is still under debate. Aims. We aim at investigate the origin of the r-process elements in the Galactic thin-disc population. Methods. From the sixth internal data release of the Gaia-ESO, we have collected a large sample of Milky Way (MW) thin- and thick-disc stars for which abundances of Eu, O, and Mg are available. The sample consists of members of 62 open clusters (OCs), located at a Galactocentric radius between ~5 kpc and ~20 kpc in the disc, in the metallicity range [0.5, 0.4], and covering an age interval from 0.1 to 7 Gy, and about 1300 Milky Way disc field stars in the metallicity range [1.5, 0.5]. We compare the observations with the results of a chemical evolution model, in which we varied the nucleosynthesis sources for the three elements considered. Results. Our main result is that Eu in the thin disc is predominantly produced by sources with short lifetimes, such as magneto-rotationally driven SNe. There is no strong evidence for additional sources at delayed times. Conclusions. Our findings do not imply that there cannot be a contribution from mergers of neutron stars in other environments, as in the halo or in dwarf spheroidal galaxies, but such a contribution is not needed to explain Eu abundances at thin-disc metallicities.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Galaxy: abundances, Galaxy: disk, Open clusters and associations: general, Stars: abundances
in
Astronomy and Astrophysics
volume
670
article number
A129
publisher
EDP Sciences
external identifiers
  • scopus:85148663285
ISSN
0004-6361
DOI
10.1051/0004-6361/202243764
language
English
LU publication?
yes
id
bb2226c7-79c4-4a22-9341-5e483046967f
date added to LUP
2023-03-16 11:09:32
date last changed
2023-03-16 11:09:32
@article{bb2226c7-79c4-4a22-9341-5e483046967f,
  abstract     = {{<p>Context. A renewed interest in the origin of r-process elements has been stimulated by the multi-messenger observation of the gravitational event GW170817, with the detection of both gravitational waves and electromagnetic waves corresponding to the merger of two neutron stars. Such a phenomenon has been proposed as one of the main sources of the r-process. However, the origin of the r-process elements at different metallicities is still under debate. Aims. We aim at investigate the origin of the r-process elements in the Galactic thin-disc population. Methods. From the sixth internal data release of the Gaia-ESO, we have collected a large sample of Milky Way (MW) thin- and thick-disc stars for which abundances of Eu, O, and Mg are available. The sample consists of members of 62 open clusters (OCs), located at a Galactocentric radius between ~5 kpc and ~20 kpc in the disc, in the metallicity range [0.5, 0.4], and covering an age interval from 0.1 to 7 Gy, and about 1300 Milky Way disc field stars in the metallicity range [1.5, 0.5]. We compare the observations with the results of a chemical evolution model, in which we varied the nucleosynthesis sources for the three elements considered. Results. Our main result is that Eu in the thin disc is predominantly produced by sources with short lifetimes, such as magneto-rotationally driven SNe. There is no strong evidence for additional sources at delayed times. Conclusions. Our findings do not imply that there cannot be a contribution from mergers of neutron stars in other environments, as in the halo or in dwarf spheroidal galaxies, but such a contribution is not needed to explain Eu abundances at thin-disc metallicities.</p>}},
  author       = {{Van Der Swaelmen, M. and Viscasillas Vázquez, C. and Cescutti, G. and Magrini, L. and Cristallo, S. and Vescovi, D. and Randich, S. and Tautvaišiene, G. and Bagdonas, V. and Bensby, T. and Bergemann, M. and Bragaglia, A. and Drazdauskas, A. and Jiménez-Esteban, F. and Guiglion, G. and Korn, A. and Masseron, T. and Minkeviiute, R. and Smiljanic, R. and Spina, L. and Stonkute, E. and Zaggia, S.}},
  issn         = {{0004-6361}},
  keywords     = {{Galaxy: abundances; Galaxy: disk; Open clusters and associations: general; Stars: abundances}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{The Gaia -ESO survey : Placing constraints on the origin of r -process elements}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202243764}},
  doi          = {{10.1051/0004-6361/202243764}},
  volume       = {{670}},
  year         = {{2023}},
}