Which Type of Planets do We Expect to Observe in the Habitable Zone?

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Adibekyan, V (Author) Other; Figueira, P (Author) Other; N.C. Santos (Author) FCUP

Journal

Title: Origins of Life and Evolution of Biospheres

Vol. 46

Pages: 351-359

ISSN: 0169-6149

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 9 Citations

Other information

Authenticus ID: P-00K-JNF

DOI: 10.1007/s11084-016-9486-1

Abstract (EN): We used a sample of super-Earth-like planets detected by the Doppler spectroscopy and transit techniques to explore the dependence of orbital parameters of the planets on the metallicity of their host stars. We confirm the previous results (although still based on small samples of planets) that super-Earths orbiting around metal-rich stars are not observed to be as distant from their host stars as we observe their metal-poor counterparts to be. The orbits of these super-Earths with metal-rich hosts usually do not reach into the Habitable Zone (HZ), keeping them very hot and inhabitable. We found that most of the known planets in the HZ are orbiting their GK-type hosts which are metal-poor. The metal-poor nature of planets in the HZ suggests a high Mg abundance relative to Si and high Si abundance relative to Fe. These results lead us to speculate that HZ planets might be more frequent in the ancient Galaxy and had compositions different from that of our Earth.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9