منابع مشابه
Exoplanet hosts reveal lithium depletion
Aims. We study the impact of the presence of planets on the lithium abundance of host stars and evaluate the previous claim that planet hosts exhibit lithium depletion when compared to their non-host counterparts. Methods. Using previously published lithium abundances, we remove the confounding effect of the different fundamental stellar parameters by applying a multivariable regression on our ...
متن کاملLithium depletion and the rotational history of exoplanet host stars
Context. It has been reported that exoplanet host stars are lithium depleted compared to solar-type stars without detected massive planets. Aims. We investigate whether enhanced lithium depletion in exoplanet host stars may result from their rotational history. Methods. We have developed rotational evolution models for slow and fast solar-type rotators from the pre-main sequence (PMS) to the ag...
متن کاملStellar activity in exoplanet hosts
Most of the efforts on the search and characterization of Earth-like exoplanets are currently focused on low mass stars. These represent the vast majority of the population in our galaxy (about 75% of the stars have a lower mass than the Sun) and their interest lies in the fact that the photometric and spectroscopic signal of orbiting Earth-like planets is higher due to lower star-planet size a...
متن کاملLithium abundances in exoplanet-host stars : modelling
Aims. Exoplanet-host stars (EHS) are known to present superficial chemical abundances different from those of stars without any detected planet (NEHS). EHS are, on the average, overmetallic compared to the Sun. The observations also show that, for cool stars, lithium is more depleted in EHS than in NEHS. The aim of this paper is to obtain constraints on possible models able to explain this diff...
متن کاملHalo Star Lithium Depletion
The depletion of lithium during the pre-main sequence and main sequence phases of stellar evolution plays a crucial role in the comparison of the predictions of big bang nucleosynthesis with the abundances observed in halo stars. Previous work has indicated a wide range of possible depletion factors, ranging from minimal in standard (non-rotating) stellar models to as much as an order of magnit...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201424218