2007A&A...473..979P


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET01:33:07

2007A&A...473..979P - Astronomy and Astrophysics, volume 473, 979-982 (2007/10-3)

Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting stars.

PASQUINI L., DOELLINGER M.P., WEISS A., GIRARDI L., CHAVERO C., HATZES A.P., DA SILVA L. and SETIAWAN J.

Abstract (from CDS):

Exo-planets are preferentially found around high metallicity main sequence stars. We investigate whether evolved stars share this property, and its implications for planet formation. Statistical tools and the basic concepts of stellar evolution theory are applied to published results as well as our own radial velocity and chemical analyses of evolved stars. We show that the metal distributions of planet-hosting (P-H) dwarfs and giants are different, and that the latter do not favor metal-rich systems. Rather, these stars follow the same age-metalicity relation as the giants without planets in our sample. The straightforward explanation is to attribute the difference between dwarfs and giants to the much larger masses of giants' convective envelopes. If the metal excess on the main sequence is due to pollution, the effects of dilution explain why this is not observed in evolved stars. Although we cannot exclude other explanations, the lack of any preference for metal-rich systems among P-H giants could be a strong indication of the accretion of metal-rich material. We discuss further tests, as well as some predictions and consequences of this hypothesis.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - stars: planetary systems

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * eta02 Hyi PM* 01 54 56.1320498641 -67 38 50.294625663   5.623 4.685     G8IIIb 93 1
2 HD 13189 * 02 09 40.1721335781 +32 18 59.160743793   9.04 7.56     K1II-III 71 1
3 * eps Tau ** 04 28 36.9988174 +19 10 49.544603 5.42 4.54 3.53     G9.5IIICN0.5 548 1
4 HD 47536 PM* 06 37 47.6183014773 -32 20 23.033515609   6.43 5.258     K1III 92 1
5 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1058 1
6 * pi.02 UMa PM* 08 40 12.8204103814 +64 19 40.573003186 6.94 5.78 4.61 3.72 3.09 K1+III 150 1
7 HD 104985 PM* 12 05 15.1177022665 +76 54 20.638478373       5.2   G8.5IIIb 138 1
8 HD 122430 * 14 02 22.7817289987 -27 25 47.199212657   6.799 5.469     K2/3III 39 1
9 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 374 1
10 * gam Cep SB* 23 39 20.9015326708 +77 37 56.505477975 5.190 4.250   2.6   K1III-IVCN1 555 1

    Equat.    Gal    SGal    Ecl

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2021.01.24-01:33:07

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