4.7 Article

Detailed elemental abundances of binary stars: searching for signatures of planet formation and atomic diffusion

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab2471

关键词

planets and satellites: formation; stars: abundances; stars: atmospheres; binaries: general; stars: evolution; planetary systems

资金

  1. Australian Research Council [FL110100012, FT140100554, DP120100991, FT180100194]
  2. European Research Council (ERC) [757448-PAMDORA]
  3. Zhejiang University
  4. NASA Hubble Fellowship - Space Telescope Science Institute [HSTHF2-51425.001]
  5. Knut and Alice Wallenberg Foundation
  6. European Organisation for Astronomical Research in the Southern hemisphere under ESO Programme [0101.D-0921(A)]
  7. W. M. Keck Foundation
  8. Australian Research Council [FT180100194] Funding Source: Australian Research Council

向作者/读者索取更多资源

The study found subtle abundance differences in four out of seven binary systems, with two of them hosting planets. The other three binary systems showed abundance differences correlated with condensation temperature. There was no clear relation found between abundance differences and the occurrence of known planets. The study also discovered a weak correlation between abundance differences and binary separation, providing a new constraint on the formation of binary systems.
Binary star systems are assumed to be co-natal and coeval, and thus to have identical chemical composition. In this work, we aim to test the hypothesis that there is a connection between observed element abundance patterns and the formation of planets using binary stars. Moreover, we also want to test how atomic diffusion might influence the observed abundance patterns. We conduct a strictly line-by-line differential chemical abundance analysis of seven binary systems. Stellar atmospheric parameters and elemental abundances are obtained with extremely high precision (<3.5 per cent) using the high-quality spectra from Very Large Telescope/uhraviolet-visual Echelle spectrograph and Keck/high-resolution Echelle spectrometer. We find that four of seven binary systems show subtle abundance differences (0.01-0.03 dex) without clear correlations with the condensation temperature, including two planet-hosting pairs. The other three binary systems exhibit similar degree of abundance differences correlating with the condensation temperature. We do not find any clear relation between the abundance differences and the occurrence of known planets in our systems. Instead, the overall abundance offsets observed in the binary systems (four of seven) could be due to the effects of atomic diffusion. Although giant planet formation does not necessarily imprint chemical signatures on to the host star, the differences in the observed abundance trends with condensation temperature, on the other hand, are likely associated with diverse histories of planet formation (e.g. formation location). Furthermore, we find a weak correlation between abundance differences and binary separation, which may provide a new constraint on the formation of binary systems.

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