Work

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

Year: 2020

Type: article

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 Bfactor ∼ 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.

Source: Monthly Notices of the Royal Astronomical Society Letters

DOI: 10.1093/mnrasl/slaa057

Authors: Diego Lorenzo-Oliveira, Jorge Meléndez, Geisa Ponte, Jhon Yana Galarza

Institutions: Universidade de São Paulo, Universidade Presbiteriana Mackenzie

Language: English

Topic: Stellar, planetary, and galactic studies

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico

Awards: G3162332147, G5715696701, High precision spectroscopy: from the first stars to planets