Is There Plenty of Metal-poor Stars with Planets in the Galactic Thick Disk?

• Type: Article in International Conference Proceedings Book
• Date: 2013

Authors

Adibekyan, VZ (Author) Other; N.C. Santos (Author) FCUP; Sousa, SG (Author) FCUP; Israelian, G (Author) Other; Figueira, P (Author) Other

Conference proceedings International

Title: NEW QUESTS IN STELLAR ASTROPHYSICS III: A PANCHROMATIC VIEW OF SOLAR-LIKE STARS, WITH AND WITHOUT PLANETS

Pages: 117-120

3rd International Conference on New Quests in Stellar Astrophysics: A Panchromatic View of Solar-like Stars With and Without Planets

Puerto Vallarta, MEXICO, MAR 12-16, 2012

Indexing

ISI Web of Knowledge - 0 Citations

Other information

Authenticus ID: P-006-FVD

Abstract (EN): We performed an uniform spectroscopic analysis of 1111 FGK dwarfs observed as part of the HARPS GTO planet search program. We applied a purely chemical approach, based on [alpha/Fe] ratio, to distinguish the various stellar components in the Galaxy. Apart from the well known Galactic thick and thin disks, we separated an alpha-enhanced stellar family at super-solar metallicities. The metal-rich high-alpha stars have orbits similar to the thin disk stars, but they are similar to thick disk stars in terms of age. Our data indicate that the incidence of stars with planets are greater among the chemically separated "thick" disk stars with [Fe/H] less than or similar to -0.3 dex than they are among "thin" disk stars in the same [Fe/H] interval. Our results allow us to suppose that a certain chemical composition, and not the Galactic birth place of the stars, is the causative factor for that.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4