The ancient main-sequence solar proxy HIP 102152 unveils the activity and rotational fate of our Sun

Author(s)

Lorenzo-Oliveira, Diego ^[1] ; Melendez, Jorge ^[1] ; Ponte, Geisa ^[2] ; Galarza, Jhon Yana ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Astron IAG USP, Rua Matao 1226, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Presbiteriana Mackenzie, Ctr Radioastron & Astrofis Mackenzie, Rua Consolacaao 930, BR-01301000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Monthly Notices of the Royal Astronomical Society; v. 495, n. 1, p. L61-L65, JUN 2020.
• Web of Science Citations: 0

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, HI Balmer, and Na I lines), finding a strong rotational signal of 35.7 +/- 1.4 d (log B-factor similar to 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. (AU)

• FAPESP's process: 16/20667-8 - Stellar chronometers: the relation between age, chromospheric activity, rotation and lithium abundances in solar-type stars
• Grantee: Diego Lorenzo de Oliveira
• Support type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 18/04055-8 - High precision spectroscopy: from the first stars to planets
• Grantee: Jorge Luis Melendez Moreno
• Support type: Research Projects - Thematic Grants