Far Beyond the Sun: Mapping the Magnetic Cycle of the Young Solar-Analog iota Horologii
Abstract
A former member of the Hyades cluster, iota Horologii (iota Hor) is a 625 Myr old Sun-like star which displays the shortest coronal activity cycle known to date (P ? 1.6 yr). This object is also the youngest star with a detected X-ray activity cycle so far. The link between activity cycles and the characteristics of the surface magnetic field is a fundamental piece of information to understand the origin of stellar magnetism in late-type stars. Here we present the final results of a long-term observing campaign aimed at studying the evolution of the magnetic cycle of iota Hor, using ground-based high-resolution spectropolarimetry. Using the technique of Zeeman Doppler Imaging (ZDI), we have successfully detected a double polarity reversal in the radial component of the large-scale magnetic field, over the course of the activity cycle of the star. Moreover, using state-of-the-art 3D Magneto-Hydrodynamics (MHD) simulations, each recovered ZDI radial field map is used to self-consistently model the coronal structure, stellar wind and astrospheric conditions around the star. These models will be compared with our long-term X-ray monitoring of the corona using XMM-Newton, and with snapshot stellar wind diagnostics from HST.
- Publication:
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Solar Heliospheric and INterplanetary Environment (SHINE 2019)
- Pub Date:
- May 2019
- Bibcode:
- 2019shin.confE.110A