| Name: | Ravinder Banyal |
| Affiliation: | IIA |
| Conference ID : | ASI2024_805 |
| Title : | Connecting exoplanets formation timeline with galactic chemical evolution |
| Authors : | Ravinder K. Banyal1, C. Swastik1, Mayank Narang2 , P. Manoj3 , T. Sivarani1, S. P. Rajaguru2,
Athira Unni1, and Bihan Banerjee3 |
| Authors Affiliation: | 1 Indian Institute of Astrophysics, Koramangala 2nd Block, Bangalore 560034, India
2 Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
3 Academia Sinica Institute of Astronomy & Astrophysics, 11F of Astro-Math Bldg., No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C. |
| Mode of Presentation: | Invited |
| Abstract Category : | Plenary |
| Abstract : | Exoplanet properties are intimately linked to the properties of the stars which host them. In this talk, I will give a short overview of the chemical abundances of planets hosting stars. Our study suggests that stars hosting massive planets are rich in iron-peak elements and poor in alpha-elements in comparison to the stellar companions of small planets. To explain these trends, we invoke galactic chemical evolution and how planets form. The older generation of stars are known to have a higher abundance of alpha-elemnts, which were produced by core-collapse supernovae prevalent in the early universe. The production and enrichment of ISM with iron-peak elements happened at the later stages of galaxy evolution via SNe Ia, rendering the young generation of stars metal-rich. The presence of high metallicity content in the ISM also favours the formation of giant planets. The implication is that different types of planets may have formed at different epochs in the history of the galaxy. More specifically, our results show that small and rocky planets are likely formed early on, whereas the formation and onset of Jupiter-type planets happened later. In terms of age, this means gas giants are relatively younger compared to small planets. Interestingly, ages determined independently from the kinematic studies and isochrone modeling also support our findings. |
