69 citations · 217 across the 11 of their papers we have counts for
11 papers
Investigating the System Configuration of Kepler-451 through Orbital Period Variations: Dynamical and Magnetic Interpretations
Huseyin Er, Aykut Ozdonmez, M. Emir Kenger +5
We present an analysis of eclipse timing variations in Kepler-451 using data spanning 2004-2024 from both ground- and space-based observations. Using two datasets, DS-A and DS-B, w…
Long-term Orbital Period Variations of the Eclipsing Dwarf Nova HT Cas
Aykut Ozdonmez, Huseyin Er, Ilham Nasiroglu +7
We present a comprehensive analysis of the long-term orbital period variations in the short-period eclipsing dwarf nova HT Cas. By combining our new high-precision mid-eclipse time…
Orbital Period Variation Analysis of the HS 0705+6700 Post-Common Envelope Binary
Huseyin Er, Aykut Özdönmez, Ilham Nasiroglu +1
To detect additional bodies in binary systems, we performed a potent approach of orbital period variation analysis. In this work, we present 90 new mid-eclipse times of a short-per…
Investigation on the Orbital Period Variations of NN Ser: Implications for the Hypothetical Planets, the Applegate Mechanism and the Orbital Stability
Aykut Özdönmez, Hüseyin ER, İlham Nasiroglu
We present 36 new mid-eclipse times obtained between 2017 and 2023 using the T100 telescope in Turkey, extending the time span of the diagram to 25 years. Once again, these n…
Probing Transit Timing Variations of Three Hot-Jupiters: HATP-36b, HATP-56b, and WASP-52b
E. Sonbas, N. Karaman, A. Özdönmez +5
We report the results of new transit observations for the three hot Jupiter-like planets HATP-36b, HATP-56b and WASP-52b respectively. Transit timing variations (TTVs) are presente…
New Observations of the Eclipsing Binary System NY Vir and its Candidate Circumbinary Planets
Huseyin Er, Aykut Özdönmez, Ilham Nasiroglu
As a result of various studies, it has been determined that several post-common envelope eclipsing binaries have variations in their orbital periods. These variations are thought t…
Is there a circumbinary planet around NSVS 14256825?
Ilham Nasiroglu, Krzysztof Gozdziewski, Aga Slowikowska +9
The cyclic behaviour of (O-C) residuals of eclipse timings in the sdB+M eclipsing binary NSVS 14256825 was previously attributed to one or two Jovian-type circumbinary planets. We…
The HU Aqr planetary system hypothesis revisited
K. Gozdziewski, A. Slowikowska, D. Dimitrov +11
We study the mid-egress eclipse timing data gathered for the cataclysmic binary HU Aquarii during the years 1993-2014. The (O-C) residuals were previously attributed to a single ~7…
Investigating AM Her Cataclysmic Variables with OPTIMA
Aga Słowikowska, Krzysztof Goździewski, Ilham Nasiroglu +3
We focus on short--period eclipsing binaries that belong to a class of Cataclysmic Variables (CVs). They are known as polars and intermediate polars, closely resembling their proto…
On the HU Aquarii planetary system hypothesis
Krzysztof Gozdziewski, Ilham Nasiroglu, Aga Slowikowska +11
In this work, we investigate the eclipse timing of the polar binary HU Aquarii that has been observed for almost two decades. Recently, Qian et al. attributed large (O-C) deviation…
Very fast photometric and X-ray observations of the intermediate polar V2069 Cygni (RX J2123.7+4217)
I. Nasiroglu, A. Słowikowska, G. Kanbach +1
We present fast timing photometric observations of the intermediate polar V2069 Cygni (RX J2123.7+4217) using the Optical Timing Analyzer (OPTIMA) at the 1.3 m telescope of Skinaka…