Using heritability of stellar chemistry to reveal the history of the Milky Way

Jackson, Holly; Jofré, P.; Yaxley, Keaghan J.; Das, Payel; Silva, Danielle de Brito; Foley, Robert

doi:10.1093/mnras/staa4028

Cited by 9 publications

(16 citation statements)

References 108 publications

(131 reference statements)

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“…Perhaps the red group here is in fact the tail of the thick disk, since the red group traces a faster chemical enrichment history, an older population and a hotter dynamics overall. The ages of the red group here and in Jackson et al (2021) are not comparable as already discussed above. It is however difficult to be certain about this interpretation when looking at the sequences of the panels outside the solar neighbourhood (Fig.…”

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 46%

“…3), in particular one at lower metallicities and higher [C/N]. It could be that this bump is the possible product of the star formation burst seen in the phylogenetic tree of Jackson et al (2021). This bump could be a also a simply selection effect, therefore concluding on its nature requires addressing the selection function of this sample.…”

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 96%

“…DISCUSSION 4.1. The evolutionary history of the Galactic disk A interesting prospect of taking the chemical abundances for studying the evolution of stellar populations is interpreting phylogenetic trees (Jofré et al 2017a;Jackson et al 2021). As explained in these papers, using phylogenetic trees in this context is possible because there is heredity between stars through the chemical abundances, in addition to descent with modification, i.e., each stellar generation is more metal-rich than the previous one, hence modifying the chemistry of the ISM.…”

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 99%

“…Because understanding and quantifying these two processes is at the core of phylogenetic studies, trees are a suitable tool that can be applied in Galactic chemical evolution studies. Jackson et al (2021) used abundances of solar twins that are very similar to those used by N20 to build such a tree. It showed two main stellar populations (branches) which were attributed to the thin and the thick disk.…”

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 99%

“…It showed two main stellar populations (branches) which were attributed to the thin and the thick disk. Jackson et al (2021) found that the root of the thin disk branch contained a group of stars whose branching pattern was poorly supported. This group had stars of very similar abundances and ages.…”

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 99%

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Two sequences in the age-metallicity relation as seen from [C/N] abundances in APOGEE

Jofre

2021

Preprint

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The age-metallicity relation is fundamental to study the formation and evolution of the disk. Observations have shown that this relation has a large scatter which can not be explained by observational errors only. That scatter is hence attributed to the effects of radial migration in which stars tracing different chemical evolution histories in the disk get mixed. However, the recent study of Nissen et al. ( 2020), using high precision observational data of solar type stars, found two relatively tight age-metallicity relations. One sequence of older and metal-richer stars probably traces the chemical enrichment history of the inner disk while the other sequence of younger and metal-poorer stars the chemical enrichment history of the outer disk. If uncertainties in age measurements increase, these sequences mix explaining the scatter of the one relation observed in other studies. This work follows up on these results, by analysing an independent sample of red clump giants observed by APOGEE. Since ages for red giants are significantly more uncertain, the [C/N] ratios are considered as a proxy for age. This larger dataset is used to investigate these relations at different Galactic radii, finding that these distinct sequences exist only in the solar neighbourhood. The APOGEE dataset is further used to explore different abundance and kinematical planes to shed light on the nature of these populations.

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Section: Contaminations and Biases In Rc Starsmentioning

confidence: 46%

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 96%

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 99%

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 99%

Section: Contaminations and Biases In Rc Starsmentioning

confidence: 99%

See 3 more Smart Citations

Two sequences in the age-metallicity relation as seen from [C/N] abundances in APOGEE

Jofre

2021

Preprint

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A baseline on the relation between chemical patterns and the birth stellar cluster

Signor,

Jofré,

Martí

et al. 2024

A&A

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The chemical composition of a star's atmosphere reflects the chemical composition of its birth environment. Therefore, it should be feasible to recognize stars born together that have scattered throughout the galaxy, solely based on their chemistry. This concept, known as strong chemical tagging is a major objective of spectroscopic studies, but it has yet to yield the anticipated results. We assess the existence and the robustness of the relation between chemical abundances and the birthplace using known member stars of open clusters. We followed a supervised machine learning approach, using chemical abundances obtained from APOGEE DR17, observed open clusters as labels, and different data preprocessing techniques. We find that open clusters can be recovered with any classifier and on data whose features are not carefully selected. In the sample with no field stars, we obtain an average accuracy of $75.2<!PCT!>$ and we find that the prediction accuracy mostly depends on the uncertainties of the chemical abundances. When field stars outnumber the cluster members, the performance degrades. Our results show the difficulty of recovering birth clusters using chemistry alone, even in a supervised scenario. This clearly challenges the feasibility of strong chemical tagging. Nevertheless, including information about ages could potentially enhance the possibility of recovering birth clusters.

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Searching for new solar twins: The Inti survey for the Northern Sky

Galarza

López-Valdivia

Reggiani

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Solar twins are key in different areas of astrophysics, however only just over a hundred were identified and well-studied in the last two decades. In this work, we take advantage of the very precise Gaia (DR2/EDR3), Tycho and 2MASS photometric systems to create the inti survey of new solar twins in the Northern Hemisphere. The spectra of our targets were initially obtained with spectrographs of moderate resolution (ARCES and Goodman spectrographs with R = 31500 and 11930, respectively) to find the best solar twin candidates and then observed at McDonald Observatory with higher resolving power (TS23, R = 60000) and signal-to-noise ratio (SNR ∼ 300-500). The stellar parameters were estimated through the differential spectroscopic equilibrium relative to the Sun, which allow us to achieve a high internal precision (σ(Teff) = 15 K, σ(log g) = 0.03 dex, σ($\rm {[Fe/H]}$) = 0.01 dex, and σ(vt) = 0.03 km s−1). We propose a new class of stars with evolution similar to the Sun: solar proxy, which is useful to perform studies related to the evolution of the Sun, such as its rotational and magnetic evolution. Its definition is based on metallicity (−0.15 dex ≤ $\rm {[Fe/H]}$ ≤ +0.15 dex) and mass (0.95 M⊙ ≤ M ≤ 1.05 M⊙) constraints, thus assuring that the star follows a similar evolutionary path as the Sun along the main sequence. Based on this new definition, we report 70 newly identified solar proxies, 46 solar analogs and 13 solar-type stars. In addition, we identified 9 close solar twins whose stellar parameters are the most similar to those of the Sun.

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Using heritability of stellar chemistry to reveal the history of the Milky Way

Cited by 9 publications

References 108 publications

Two sequences in the age-metallicity relation as seen from [C/N] abundances in APOGEE

Two sequences in the age-metallicity relation as seen from [C/N] abundances in APOGEE

A baseline on the relation between chemical patterns and the birth stellar cluster

Searching for new solar twins: The Inti survey for the Northern Sky

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