\documentclass{article}

\title{Timing enhancement in Airshower Radio Detectors}
\date{2021-11-22}
\author{
	Eric Teunis de Boone\\
	{ \small Supervisors: }\\
	Harm Schoorlemmer \\
}

\begin{document}
\maketitle{}
\hrule
\begin{abstract}
\end{abstract}
\end{document}