Planets Around Solar Twins/Analogs (PASTA)
Year: 2026
Type: article
Abstract: Context. Abundance ratios between elements synthesized on different nucleosynthetic timescales provide the empirical chemical clocks needed to estimate stellar ages, but robust calibrations require homogeneous samples with precise stellar parameters and elemental abundances. Aims. We investigate whether the presence of planets modifies empirical chemical clock relations. Methods. We present high-precision stellar parameters and elemental abundances for 52 new planet-hosting targets observed with Keck/HIRES, LBT/PEPSI, and Subaru/HDS. The full sample, i.e., the sample presented here combined with those from Papers I and II, comprises 94 stars, of which 81 are identified as planet-hosting solar twins and analogs. We used this sample to characterize the Galactic chemical evolution and derive empirical chemical clock relations. Results. We recover the expected Galactic chemical evolution trends, with α -elements such as Mg and S increasing with stellar age, while s -process elements such as Y, Ba, and Sr show negative age correlations. In contrast, Fe-peak elements and the r -process element Eu show little or no significant age dependence. These trends give rise to tight chemical clock relations based on [Y/Mg], [Y/Al], [Ba/Mg], [Ba/Al], and [Sr/Mg], with [Y/Mg] and [Y/Al] providing the strongest correlations. [Ba/Al] shows the steepest age dependence, and the Ba-based ratios are generally more sensitive to age than their Y-based counterparts. Conclusions. Planet-hosting solar analogs follow chemical clock relations consistent with those of nearby solar twins, with no evidence of a significant planet-related effect. The derived relations are primarily applicable to local solar twins and analogs in the Galactic thin disk.
Source: Astronomy and Astrophysics
Institutions: Shanghai Jiao Tong University, The Ohio State University, Max Planck Institute for Astronomy, Tsinghua University, University of Hawaiʻi at Mānoa, University of Hawaii System, Leibniz Institute for Astrophysics Potsdam, Australian National University, Nanjing University, Chinese Academy of Sciences, National Astronomical Observatories
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Funders: National Aeronautics and Space Administration, W. M. Keck Foundation, Ohio State University, California Institute of Technology, University of Minnesota, University of Arizona, University of Notre Dame, Arizona Board of Regents, NASA Exoplanet Science Institute, Science and Technology Commission of Shanghai Municipality, Shanghai Jiao Tong University, Istituto Nazionale di Astrofisica, Leibniz-Institut für Astrophysik Potsdam, Office of Science, Leibniz-Gemeinschaft, National Key Research and Development Program of China
OpenAlex ID: W7214738003