On the origin of stars with and without planets T-c trends and clues to Galactic evolution

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Adibekyan, VZ (Author) Other; Gonzalez Hernandez, JIG (Author) Other; Delgado Mena, ED (Author) FCUP; Sousa, SG (Author) FCUP; N.C. Santos (Author) FCUP; Israelian, G (Author) Other; Figueira, P (Author) Other; Bertran de Lis, SB (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 564

Final page: L15

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 65 Citations

Scopus - 70 Citations

Other information

Authenticus ID: P-009-B3M

DOI: 10.1051/0004-6361/201423435

Abstract (EN): We explore a sample of 148 solar-like stars to search for a possible correlation between the slopes of the abundance trends versus condensation temperature (known as the T-c slope) with stellar parameters and Galactic orbital parameters in order to understand the nature of the peculiar chemical signatures of these stars and the possible connection with planet formation. We find that the T-c slope significantly correlates (at more than 4 sigma) with the stellar age and the stellar surface gravity. We also find tentative evidence that the T-c slope correlates with the mean galactocentric distance of the stars (R-mean), suggesting that those stars that originated in the inner Galaxy have fewer refractory elements relative to the volatiles. While the average T-c slope for planet-hosting solar analogs is steeper than that of their counterparts without planets, this difference probably reflects the difference in their age and R-mean. We conclude that the age and probably the Galactic birth place are determinant to establish the star's chemical properties. Old stars (and stars with inner disk origin) have a lower refractory-to-volatile ratio.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6