<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">COLOQUIOS CIENTIFICOS EN EL IAFE<br class="">———————————————————<div class=""><div class=""><br class=""></div><div class=""><span class="" style="font-size: 13px;"><b class="">"Do metal-poor stars have less low-mass planets?"</b></span></div><div class=""><div class="">João Faria </div><div class="">Instituto de Astrofísica e Ciências do Espaço / Universidade do Porto, Portugal</div><div class=""><br class=""></div><div class="">Viernes 3 de noviembre, 14:00 hs.</div><div class="">Aula del IAFE</div></div><div class=""><br class=""></div><div class="">Stellar metallicity and planet formation are intimately linked. According to the core accretion planet formation model, low-mass planets are expected to orbit stars with a wide range of metallicities, while giant planets should be more common around metal-rich stars. But the existence of a planet-metallicity relation for the low-mass planets is not yet fully confirmed or quantified observationally. <span class="" style="font-size: 13px;">To address this problem, we have been using HARPS radial-velocity observations to study a sample of metal-poor stars. Our goal is to detect low-mass planets, with masses close to that of the Earth and Neptune, and to estimate their frequency around low-metallicity stars. I will present the latest results of this decade-long search, explain some of the difficulties that stellar activity poses on planet detection, and describe a new algorithm being </span>developed to<span class="" style="font-size: 13px;"> help with planet detection in radial-velocity data.</span></div></div></body></html>