Detection of period variations of eclipsing binaries in the Catalina Sky Survey

Παπαγεωργίου, Αθανάσιος; Catelan, M.; Christopoulou, P. E.; Drake, A. J.; Djorgovski, S. G.

doi:10.1093/mnras/stab646

Cited by 11 publications

(9 citation statements)

References 51 publications

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“…The physical parameters of the EA systems were explored by Lee ( 2015 ), Papageorgiou et al ( 2019 ), and Carmo et al ( 2020 ). Using the same sample of 4683 EA in CSS, Papageorgiou et al ( 2021 ) reported 126 EAs with possible quadratic or cyclic period variations. We focus on the initial sample of Drake et al ( 2014a ) of 30 743 eclipsing binaries classified as EWs.…”

Section: The Catalina Samplementioning

confidence: 99%

New low mass ratio contact binaries in the Catalina Sky Survey

Christopoulou

Lalounta

Παπαγεωργίου

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present the identification and photometric analysis of 30 new low mass ratio (LMR) totally eclipsing contact binaries found in Catalina Sky Survey data. The LMR candidates are identified using Fourier coefficients and visual inspection. We perform a detailed scan in the parameter plane of mass-ratio (q) versus inclination (i) using Phoebe-0.31 scripter to derive the best (q, i) pair for the initial models. The relative physical parameters are determined from the final model of each system. A Monte Carlo approach was adopted to derive the parameter errors. The resulting parameters confirm the identification. The approximate absolute physical parameters of the systems are estimated based on the light curve solutions and Gaia early Data Release 3 distances. Twelve out of 30 new systems have fill-out factors $f>50{{\ \rm per\ cent}}$ and q ≤ 0.25 (deep contact LMR systems), and 8 of them, to within errors, are extreme LMR deep systems with q ≤ 0.1. We discuss the evolutionary status of the 30 LMR systems in comparison with the most updated catalog of LMR systems from the literature. The scenario of the LMR systems as pre-merger candidates forming fast rotating stars is investigated for all systems, new and old, based both on Hut’s stability criteria and critical instability mass ratio (qinst) relation. CSS$\_$J075848.2+125656, with q/qinst = 1.23 ± 0.23, and CSS$\_$J093010.1-021624, with q/qinst = 1.25 ± 0.23, can be considered as merger candidates.

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Section: The Catalina Samplementioning

confidence: 99%

New low mass ratio contact binaries in the Catalina Sky Survey

Christopoulou

Lalounta

Παπαγεωργίου

et al. 2022

Monthly Notices of the Royal Astronomical Society

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“…Among the remaining USPCBs of Table 5, SDSS J001641−000925 and CC Com also show cyclic period variations, interpreted as an indication of the presence of a third body (denoted by footnote a in the table). Three systems, namely, CRTS_J014418.3+190625, CRTS_J003033.05+574347.6, and CRTS_J074350.9+ 451620, show parabolic trends in their period variation studies, of the order of (1-3) × 10 −7 days yr −1 , that could also potentially be considered as part of a long-term cyclic variation (Papageorgiou et al 2021). Considering the role of orbital period changes in the evolution history of USPCBs, in our future work, we are going to investigate/update the period variation of these systems by collecting many eclipsing times, both new and archival, from photometric surveys and applying robust modern and sophisticated optimization methods.…”

Section: Discussionmentioning

confidence: 99%

Three Ultra-short-period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys

Παπαγεωργίου

Christopoulou

Lopes

et al. 2023

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We present the photometric analysis of three ultra-short-period total eclipsing binaries in contact configuration, CRTS_J172718.0+431624, OGLE-BLG-ECL-000104, and OGLE-BLG-ECL-000012, mined from massive astronomical surveys. Using the available archival light curves (LCs) from Vista Variables in the Vía Láctea (VVV), Optical Gravitational Lensing Experiment (OGLE), Zwicky Transient Facility, and Catalina Sky Survey in different passbands and new multiband photometric observations with the 2.3 m Aristarchos telescope at Helmos Observatory, their relative physical parameters were derived. We explored the parameter space by using the PIKAIA genetic algorithm optimizer. The best photometric solution and error budget estimation were adopted for each system through Markov Chain Monte Carlo sampling of the global optimum. The approximate absolute parameters were derived for each contact system adopting an empirical mass–luminosity relation. All three systems have a mass ratio lower than 0.5. The exchange between the primary and secondary depths of CRTS_J172718.0+431624 during 2016–2022 may be due to spot activity. In addition, we present a detailed analysis of the first well-characterized shortest-period contact eclipsing binary with total eclipses known so far (OGLE-BLG-ECL-000104). Thanks to VVV and OGLE LCs, new distances were derived for OGLE-BLG-ECL-000104 and OGLE-BLG-ECL-000012 using empirical period–luminosity relations. The origin and evolutionary status of all three ultra-short-period contact binaries are thoroughly discussed in the context of the detached binary formation channel.

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“…The physical parameters of the EA systems were explored by Lee (2015), Papageorgiou et al (2019a), andCarmo et al (2020). Using the same sample of 4683 EA in CSS, Papageorgiou et al (2021) reported 126 EAs with possible quadratic or cyclic period variations. We focus on the initial sample of Drake et al (2014a) of 30,743 eclipsing binaries classified as EWs.…”

Section: The Catalina Samplementioning

confidence: 99%

New low mass ratio contact binaries in the Catalina Sky Survey

Christopoulou,

Lalounta,

Papageorgiou

et al. 2022

Preprint

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We present the identification and photometric analysis of 30 new low mass ratio (LMR) totally eclipsing contact binaries found in Catalina Sky Survey data. The LMR candidates are identified using Fourier coefficients and visual inspection. We perform a detailed scan in the parameter plane of mass-ratio (𝑞) versus inclination (𝑖) using Phoebe-0.31 scripter to derive the best (𝑞, 𝑖) pair for the initial models. The relative physical parameters are determined from the final model of each system. A Monte-Carlo approach was adopted to derive the parameter errors. The resulting parameters confirm the identification. The approximate absolute physical parameters of the systems are estimated based on the light curve solutions and Gaia early Data Release 3 distances. Twelve out of 30 new systems have fill-out factors 𝑓 > 50% and 𝑞 ≤ 0.25 (deep contact LMR systems), and 8 of them, to within errors, are extreme LMR deep systems with 𝑞 ≤ 0.1. We discuss the evolutionary status of the 30 LMR systems in comparison with the most updated catalog of LMR systems from the literature. The scenario of the LMR systems as pre-merger candidates forming fast rotating stars is investigated for all systems, new and old, based both on Hut's stability criteria and critical instability mass ratio (𝑞 inst ) relation. CSS_J075848.2+125656, with 𝑞/𝑞 inst = 1.23 ± 0.23, and CSS_J093010.1-021624, with 𝑞/𝑞 inst = 1.25 ± 0.23, can be considered as merger candidates.

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Detection of period variations of eclipsing binaries in the Catalina Sky Survey

Cited by 11 publications

References 51 publications

New low mass ratio contact binaries in the Catalina Sky Survey

New low mass ratio contact binaries in the Catalina Sky Survey

Three Ultra-short-period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys

New low mass ratio contact binaries in the Catalina Sky Survey

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