add kepler/tess text to introduction

Physics_Thesis_Template/content/chapter-introduction.tex

@@ -42,20 +42,32 @@ The spectral types are a way to classify the vast amount of stars into various t
 
 \section{Flares and Spots \label{sec:intro:flares_and_spots}}
 
+\subsection{Spots}
+
+
+
+\subsection{Flares}
+
+
+
 % Stellar Activity, 
 
 \section{Space missions \label{sec:intro:space_missions}}
 
 % TESS, Kepler/K2
+This section gives a short overview on the space mission from which the data was used for this study.
 
-\subsection{Kepler}
-
-
-\subsection{K2}
+\subsection{Kepler and K2}
 
+The Kepler space telesope was named after Johannes Kepler and was launched in 2009 (\cite{nasa_kepler_in_depth}) and its primary mission lasted till May 2013 (\cite{kepler_missions_and_data_mast}). Its main scientific goal was the discovery of exoplanets, especially Earth-sized ones, in the habitable zone around their host star (\cite{kepler_missions_caltech}, \cite{Kepler_first_results}). This was done by observing transits of planets around their host star (\cite{kepler_missions_caltech}, \cite{kepler_missions_and_data_mast}, \cite{Kepler_first_results}). \\
+It provides two different types of data: short cadence (1 minute exposure) and long cadence (30 minute exposure) data (\cite{Kepler_first_results}, \cite{kepler_missions_and_data_mast}). While short cadence data provides a higher temporal resolution, it was used for fewer targets (\cite{Kepler_first_results}). It had a fixed exposure time of 6.02 seconds for its photometer with a field of view of 115 $deg^{2}$ near the cygnus constellation (\cite{Kepler_first_results}, \cite{kepler_missions_and_data_mast}). The data was then for selected targets accumulated to either short or long cadence, and then downloaded (\cite{Kepler_first_results}). The space telescope could accomondate data of around 170,000 targets with long cadence and 512 targets with short cadence (\cite{Kepler_first_results}). The resolution of each of the 42 CCDs was 4 arcseconds per pixel (\cite{doyle_2019}, \cite{kepler_mission_stellar_and_instrument_noise}).\\
+The K2 mission is the continuation mission of Kepler after the second of four of its reaction wheels broke in 2013 (\cite{nasa_kepler_in_depth}, \cite{k2_missions_and_data_mast}). Due to this, a new mission was proposed, keeping the now limited capabilities in mind (\cite{nasa_kepler_in_depth}). The mission was active from February 2014 till September 2018 when its fuel ran out (\cite{k2_missions_and_data_mast}, \cite{kepler_end_nytimes}, \cite{kepler_end_nasa_press}). It discovered a total of over 2600 planets as of 2018 (\cite{kepler_end_nytimes}, \cite{kepler_end_nasa_press}).
 
 \subsection{TESS}
 
+The Transiting Exoplanet Survey Satellite (TESS) was launched in 2018, with its primary mission lasting two years (\cite{tess_nasa}). Since 2020 TESS is in its extended missions, the first being from 2020 to 2022 (\cite{tess_extended_mission_1}), the second from 2022 to 2024 (\cite{tess_extended_mission_2}). TESS has four identical cameras, with each providing a 24 times 24 degree field of view (\cite{tess_tess}, \cite{TESS2014}). TESS's CCDs have a pixel scale of 21 arcseconds (\cite{TESS2014}, \cite{doyle_2019}). The data is provided in 2 minute cadence for individual stars and 30 minute cadence for full frame images (\cite{tess_tess}).\\
+TESS observes its targets in so called sectors. Each sector is observed for 27 days (\cite{tess_tess}). 
+
 %\section{Current knowledge \label{sec:intro:current_knowledge}}