Starspots on the fastest rotators in the Beta Pic moving group
D. Garcia-Alvarez (1,2,3), A.F. Lanza (4), S. Messina (4), J.J. Drake, (3), F. van Wyk (5), R.R. Shobbrook (6), C.J. Butler (7), D. Kilkenny (8),, J.G. Doyle (7), V.L. Kashyap (3) ((1) Instituto de Astrof\'isica de Canarias,, Tenerife, Spain, (2) Grantecan CALP, La Palma, Spain

TL;DR
This study investigates the rotation periods, spot patterns, and physical parameters of two young, fast-rotating stars in the Beta Pictoris moving group using high-resolution spectroscopy and photometric monitoring, revealing rapid rotation and dynamic spot coverage.
Contribution
It provides detailed surface spot maps and rotation characteristics of two very young stars, demonstrating rapid spot evolution and advanced mapping techniques for stellar activity analysis.
Findings
Rotation periods of ~0.355-0.356 days for both stars
Significant increase in spot coverage over 20 days
Active longitude identified on HD199143
Abstract
Aims: We carried out high-resolution spectroscopy and BV(I)_C photometric monitoring of the two fastest late-type rotators in the nearby Beta Pictoris moving group, HD199143 (F7V) and CD-641208 (K7V). The motivation for this work is to investigate the rotation periods and photospheric spot patterns of these very young stars, with a longer term view to probing the evolution of rotation and magnetic activity during the early phases of main-sequence evolution. We also aim to derive information on key physical parameters, such as rotational velocity and rotation period. Methods: We applied maximum entropy (ME) and Tikhonov regularizing (TR) criteria to derive the surface spot map distributions of the optical modulation observed in HD199143 (F7 V) and CD-641208 (K7V). We also used cross-correlation techniques to determine stellar parameters such as radial velocities and rotational…
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