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How common is our sun in its period of rotation?

Grant number: 14/26908-1
Support type:Scholarships in Brazil - Master
Effective date (Start): April 01, 2015
Effective date (End): July 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Jorge Luis Melendez Moreno
Grantee:Leonardo Augusto Gonçalves dos Santos
Home 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


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)

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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; 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. Web of Science Citations: 9.
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; CASAGRANDE, LUCA. 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. Web of Science Citations: 14.

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