How common is our sun in its period of rotation?

• Grant number: 14/26908-1
• Support Opportunities: Scholarships in Brazil - Master
• Start date: April 01, 2015
• End date: July 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Jorge Luis Melendez Moreno
• Grantee: Leonardo Augusto Gonçalves dos Santos
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 12/24392-2 - High precision spectroscopy: impact in the study of planets, stars, the galaxy and cosmology, AP.TEM
• Associated scholarship(s): 16/01684-9 - Revealing the orbits of solar twin binaries with enhanced rotation, BE.EP.MS

Abstract

This project intends to determine how common is the Sun in its rotation period, by comparing the projected rotational velocity of solar twins to the solar value. We will take into account the average value of the inclination angle I for random orientations (sin i = p/4), and we will also consider possible variations between rotational velocity and age in our sample stars. Our goal will be accomplished by analyzing the line profiles of a large sample of solar twins (88 stars) observed at high spectral resolution by the MIKE spectrograph at the 6.5 m Magellan telescope, as part of our large program to search for planets around solar twins with the HARPS spectrograph at ESO. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DOS SANTOS, LEONARDO A.; MELENDEZ, JORGE; DO NASCIMENTO, JR., JOSE-DIAS; BEDELL, MEGAN; RAMIREZ, IVAN; BEAN, JACOB L.; ASPLUND, MARTIN; SPINA, LORENZO; DREIZLER, STEFAN; ALVES-BRITO, ALAN; et al. The Solar Twin Planet Search IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars. Astronomy & Astrophysics, v. 592, AUG 2016. (14/15706-9, 16/01684-9, 12/24392-2, 14/26908-1)

DOS SANTOS, LEONARDO A.; MELENDEZ, JORGE; BEDELL, MEGAN; BEAN, JACOB L.; SPINA, LORENZO; ALVES-BRITO, ALAN; DREIZLER, STEFAN; RAMIREZ, IVAN; ASPLUND, MARTIN. Spectroscopic binaries in the Solar Twin Planet Search program: from substellar-mass to M dwarf companions. Monthly Notices of the Royal Astronomical Society, v. 472, n. 3, p. 3425-3436, DEC 2017. (14/15706-9, 16/01684-9, 12/24392-2, 14/26908-1)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SANTOS, Leonardo Augusto Gonçalves dos. The rotational evolution of Sun-like stars and the influence of low-mass binary companions. 2017. Master's Dissertation - Universidade de São Paulo (USP). Instituto Astronômico e Geofísico (IAG/SBD) São Paulo.