A list of 43 Double Compact Stars
Pedro Jesus (1,3) Laurindo Sobrinho (1,2,3)
(1) Faculdade de Ciências Exatas e da Engenharia (FCEE), Universidade da Madeira, Caminho da Penteada, 9000-390 Funchal
(2) Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, PT1349-018 Lisboa, Portugal
(3) Grupo de Astronomia da Universidade da Madeira (GAUMa)A star at the end stage of its evolution will lead to the formation of a compact object such as a White Dwarf (WD), a Neutron Star (NS) or a Black Hole (BH). Since a significant fraction of the stars that we observe in our Galaxy are part of close binary systems it is plausible to expect also an important fraction of binary systems in which the two components had already attained the compact stage. In this work we have elaborated a list of 43 Double Compact Stars (DCSs) including WD-WD, WD-NS, NS-NS and BH-BH systems and explored possible relations between masses, orbital periods (P_{orb}) and orbital semi-major axis (a). As a result we found out the empirical relation P_{orb} approx. a^(1.5)/10 which is in fact an expression of Kepler’s Third Law.
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Relatório A list of 43 Double Compact Stars; Jesus P. D. F., Sobrinho J. L. G. (2024); Relatório do trabalho desenvolvido ao abrigo do programa Estágios de Verão 2024 da Secretaria Regional da Educação - Direção Regional de Juventude, 17 pp; Universidade da Madeira 2024. pdf (345 kB)