Improving stellar parameters for transiting planet surveys
Stellar, Exoplanet and Galactic Science from Massive, High-precision Variability Surveys
Amanda Doyle
University of Warwick
High precision photometric surveys that detect transiting exoplanets require accurate stellar parameters before the planet can be properly characterised. The Homogeneous Study of Transiting Systems (HoSTS) aims to characterise planets and their host stars consistently, and to use a homogeneous, high quality set of stellar spectra. Prior to analysing a large set of spectra of planet host stars, it is imperative to ensure that the analysis methods are returning the most accurate and precise stellar parameters possible. The best way to ensure this is to analyse a set of standard stars that already have well known fundamental parameters from direct methods.

Here, a detailed spectroscopic analysis of a set of standard stars is presented, and systematic differences between various analysis methods are identified. A line list that has been selected from the Sun will not perform well for stars that are of a significantly different temperature. For example, in cooler stars lines will become blended which means that they can no longer be used. A new line list has been created which is optimised for stars of different temperatures, as well as for stars with a relatively high rotational velocity.
09:00 - 10:30