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Revealing the orbits of solar twin binaries with enhanced rotation

Grant number: 16/01684-9
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): June 01, 2016
Effective date (End): November 30, 2016
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal researcher:Jorge Luis Melendez Moreno
Grantee:Leonardo Augusto Gonçalves dos Santos
Supervisor abroad: Jacob Bean
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: University of Chicago, United States  
Associated to the scholarship:14/26908-1 - How common is our sun in its period of rotation?, BP.MS


This project intends to follow up the current research being carried on in Brazil by characterizing the spectroscopic binaries detected in our sample of solar twins. These stars show enhanced rotation rates when compared to single stars, which suggests they may have a different rotational evolution. We aim towards obtaining the orbits of these multiple stellar systems by analyzing radial velocity data from our HARPS and MIKE observations and from the literature. Our objective can be accomplished by fitting binary orbit parameters to the variation of radial velocities with time. This will allow us to precisely measure the masses of the binaries and their ages, which is key to provide stringent tests on stellar ages of the primary star obtained through isochrones and on current models of stellar evolution of binaries.

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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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