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Centro de Astrofísica da Universidade do Porto

Constraints to dark-matter properties from asteroseismic analysis of KIC 2009504

I. M. Brandão, J. Casanellas

Abstract.
Asteroseismology is an unique tool to provide us with valuable information about the interior of stars. In the golden era of the CoRoT and the Kepler space telescopes, thousands of high precision time series of pulsating stars were obtained and further analysed using asteroseismology. From Kepler data, Silva-Aguirre et al. (2013) were able to detect for the first time the presence of a convective core in a main-sequence solar-like pulsator. This star, KIC 2009504 (also known as Dushera) was found by the authors to have a mass of 1.15+-0.04 MSun and an age of 3.80+-0.37 Gyr. Casanellas & Lopes (2013) showed that asteroseismology can be used to constrain some properties of dark-matter (DM) particles. They argued that a fraction of weakly interacting DM candidates with an intrinsic matter-anti matter asymmetry (ADM) do not annihilate after being gravitationally captured by stars and, thus, influence their internal structure. One outcome of this interaction is the suppression of the convective core expected to be present in main-sequence stars with masses between 1.1 and 1.3MSun in a dark-matter free scenario. In this work we show the results of modelling Dushera when including a dark-matter scenario. We present some constraints on the properties of ADM in order to allow the presence of the convective core in this star.

The Space Photometry Revolution
Toulouse, France
July 2014

Type: Poster

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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