Far beyond the Sun: I. The beating magnetic heart in Horologium
Juli\'an D. Alvarado-G\'omez (1), Gaitee A. J. Hussain (2, 3),, Jeremy J. Drake (1), Jean-Fran\c{c}ois Donati (4), Jorge Sanz-Forcada (5),, Beate Stelzer (6), Ofer Cohen (7), Eliana M. Amazo-G\'omez (8, 9), Jason, H. Grunhut (10), Cecilia Garraffo (1), Sofia P. Moschou (1)

TL;DR
This study investigates the magnetic activity cycle of the young, Sun-like star $ ext{iota}$ Hor, revealing a beating pattern from two close periodic signals, and provides the first measurements of its surface magnetic field and rotation period.
Contribution
It presents the first long-term spectropolarimetric analysis of $ ext{iota}$ Hor, identifying a beating pattern in its activity cycle and measuring its surface magnetic field and rotation period.
Findings
Long-term chromospheric activity follows a beating pattern from two close cycles.
Surface magnetic field varies within ±4 G.
Stellar activity affects radial velocity measurements, complicating planet detection.
Abstract
A former member of the Hyades cluster, Horologii ( Hor) is a planet-hosting Sun-like star which displays the shortest coronal activity cycle known to date ( 1.6 yr). With an age of Myr, Hor is also the youngest star with a detected activity cycle. The study of its magnetic properties holds the potential to provide fundamental information to understand the origin of cyclic activity and stellar magnetism in late-type stars. In this series of articles, we present the results of a comprehensive project aimed at studying the evolving magnetic field in this star and how this evolution influences its circumstellar environment. This paper summarizes the first stage of this investigation, with results from a long-term observing campaign of Hor using ground-based high-resolution spectropolarimetry. The analysis includes precise…
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