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Title:
On the rotational behaviour of parent stars of extrasolar planets
Authors:
Alves, S.; Do Nascimento, J. D., Jr.; de Medeiros, J. R.
Affiliation:
AA(Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN, Brazil), AB(Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN, Brazil), AC(Departamento de Física, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN, Brazil)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 408, Issue 3, pp. 1770-1777. (MNRAS Homepage)
Publication Date:
11/2010
Origin:
WILEY
Astronomy Keywords:
planetary systems, stars: rotation
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2010.17243.x
Bibliographic Code:
2010MNRAS.408.1770A

Abstract

We analysed the behaviour of the rotational velocity in the parent stars of extrasolar planets. Projected rotational velocity v sini and angular momentum were combined with stellar and planetary parameters, for a unique sample of 147 stars, amounting to 184 extrasolar planets, including 25 multiple systems. Indeed, for the present working sample we considered only stars with planets detected by the radial-velocity procedure. Our analysis shows that the v sini distribution of stars with planets along the HR diagram follows the well-established scenario for the rotation of intermediate to low main-sequence stars, with a sudden decline in rotation near 1.2 Msolar. The decline occurs around Teff ~ 6000K, corresponding to the late-F spectral region. A statistical comparison of the distribution of the rotation of stars with planets and a sample of stars without planets indicates that the v sini distribution for these two families of stars is drawn from the same population distribution function. We also found that the angular momentum of extrasolar planet parent stars follows, at least qualitatively, Kraft's relation J ~ (M/Msolar)alpha. The stars without detected planets show a clear trend of angular momentum deficit compared to the stars with planets, in particular for masses higher than about 1.25 Msolar. Stars with the largest mass planets tend to have angular momentum comparable to or higher than the Sun.
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