Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8039
Title: Galactic Chemical Evolution of Exoplanet Hosting Stars: Are High-mass Planetary Systems Young?
Authors: Swastik, C
Banyal, R. K
Narang, Mayank
Manoj, P
Sivarani, T
Rajaguru, S. P
Athira Unni
Banerjee, Bihan
Keywords: Spectroscopy
Extrasolar gaseous giant planets
Exoplanet formation
Stellar ages
Metallicity
Chemical abundances
Exoplanets
Issue Date: 1-Aug-2022
Publisher: American Astronomical Society
Citation: The Astronomical Journal, Vol. 164, No. 2, 60
Abstract: The imprints of stellar nucleosynthesis and chemical evolution of the galaxy can be seen in different stellar populations, with older generation stars showing higher α-element abundances and the later generations becoming enriched with iron-peak elements. The evolutionary connections and chemical characteristics of circumstellar disks, stars, and their planetary companions can be inferred by studying the interdependence of planetary and host star properties. Numerous studies in the past have confirmed that high-mass giant planets are commonly found around metal-rich stars, while the stellar hosts of low-mass planets have a wide range of metallicity. In this work, we analyzed the detailed chemical abundances for a sample of >900 exoplanet hosting stars drawn from different radial velocity and transit surveys. We correlate the stellar abundance trends for α- and iron-peak elements with the planets’ mass. We find the planet mass–abundance correlation to be primarily negative for α-elements and marginally positive or zero for the iron-peak elements, indicating that stars hosting giant planets are relatively younger. This is further validated by the age of the host stars obtained from isochrone fitting. The later enrichment of protoplanetary material with iron and iron-peak elements is also consistent with the formation of the giant planets via the core accretion process. A higher metal fraction in the protoplanetary disk is conducive to rapid core growth, thus providing a plausible route for the formation of giant planets. This study, therefore, indicates that the observed trends in stellar abundances and planet mass are most likely a natural consequence of Galactic chemical evolution.
Description: Open Access
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
URI: http://hdl.handle.net/2248/8039
ISSN: 1538-3881
Appears in Collections:IIAP Publications



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.