@Article{PapageorgiouCLLCDHA:2023:UnLoCo,
               author = "Papageorgiou, Athanasios and Christopoulou, Panagiota-Eleftheria 
                         and Lalounta, Eleni and Lopes, Carlos Eduardo Ferreira and 
                         Catelan, M{\'a}rcio and Drake, Andrew J. and Hantzios, Panayiotis 
                         and Alikakos, Ioannis",
          affiliation = "{University of Patras} and {University of Patras} and {University 
                         of Patras} and {Instituto Nacional de Pesquisas Espaciais (INPE)} 
                         and {Pontificia Universidad Cat{\'o}lica de Chile} and 
                         {California Institute of Technology} and {National Observatory of 
                         Athens} and {National Observatory of Athens}",
                title = "A Unique Low-mass-ratio Contact Eclipsing Binary System under the 
                         Period Cutoff",
              journal = "Astrophysical Journal",
                 year = "2023",
               volume = "952",
               number = "2",
                pages = "e141",
                month = "Aug.",
             abstract = "We present a multiband photometric analysis of CRTS 
                         J163819.6+03485, the first low-mass-ratio contact binary system 
                         with a period of 0.2053321 day under the contact binary period 
                         limit. The unprecedented combination of mass ratio and period 
                         makes this system unique for eclipsing binary (EB) research. Using 
                         new multiband photometric observations, we explored the parameter 
                         space of this unique total EB system through a detailed scan in 
                         the mass ratio-inclination plane and using the pikaia genetic 
                         algorithm optimizer. The best set of relative physical parameters 
                         and corresponding uncertainties was adopted through Markov Chain 
                         Monte Carlo sampling of the parameter space. The resulting mass 
                         ratio of the system is q = 0.16 ± 0.01. The absolute parameters 
                         were derived by adopting an empirical mass-luminosity relation. 
                         Period changes are also investigated by using new observations and 
                         archival photometric light curves from massive astronomical 
                         surveys, which revealed in a preliminary solution the presence of 
                         a possible low-mass tertiary companion. The origin and 
                         evolutionary status of the system are investigated through the 
                         detached binary formation scenario.",
                  doi = "10.3847/1538-4357/acdcf3",
                  url = "http://dx.doi.org/10.3847/1538-4357/acdcf3",
                 issn = "0004-637X and 1538-4357",
             language = "en",
           targetfile = "Papageorgiou_2023_ApJ_952_141.pdf",
        urlaccessdate = "28 jun. 2024"
}