The ancient main-sequence solar proxy HIP 102152 unveils the activity and rotational fate of our Sun. (7th April 2020)

• Record Type: Journal Article
• Authors: Lorenzo-Oliveira, Diego; Meléndez, Jorge; Ponte, Geisa; Yana Galarza, Jhon
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 495:Number 1(2020)
• Page Start: L61
• Page End: L65
• Publication Date: 2020-04-07
• Subjects: Sun: rotation -- stars: activity -- stars: chromospheres -- stars: fundamental parameters -- stars: rotation -- stars: solar-type; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/slaa057
• Languages: English
• ISSNs: 1745-3933

Abstract

ABSTRACT: We present a detailed analysis of the possible future Sun's rotational evolution scenario based on the 8-Gyr-old solar twin HIP 102152. Using HARPS high-cadence observations (and TESS light curves), we analysed the modulation of a variety of activity proxies (Ca ii , H i Balmer, and Na i lines), finding a strong rotational signal of 35.7 ± 1.4 d (log B factor ∼ 70, in the case of Ca ii K line). This value matches with the theoretical expectations regarding the smooth rotational evolution of the Sun towards the end of the main sequence, validating the use of gyrochronology after solar age.