31 citations · 126 across the 9 of their papers we have counts for
9 papers
Investigating Optical Variability of the Blazar S5 0716+714 On Diverse Time-scales
Ergün Ege, Aykut Özdönmez, Aditi Agarwal +1
We present the results of the observational study of the blazar S5 0716+716 in the optical bands B, V, R, and I between March 2019 and August 2023 to investigate its variability on…
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…
Analysis of the intra-night variability of BL Lacertae during its August 2020 flare
Aditi Agarwal, B. Mihov, Vipul Agrawal +7
We present an analysis of the photometry of the blazar BL Lacertae on diverse timescales from mid-July to mid-September 2020. We have used 11 different optical telescopes ar…
Galactic Model Parameters and Space Density of Cataclysmic Variables in Gaia Era: New Constraints to Population Models
R. Canbay, S. Bilir, A. Özdönmez +1
The spatial distribution, Galactic model parameters and luminosity function of cataclysmic variables (CVs) are established using re-estimated trigonometric parallaxes of {\it Gaia}…
Multi-wavelength study of TeV blazar 1ES 1218+304 using gamma-ray, X-ray and optical observations
Rishank Diwan, Raj Prince, Aditi Agarwal +6
We report the multi-wavelength study for a high-synchrotron-peaked BL Lac 1ES 1218+304 using near-simultaneous data obtained during the period from January 1, 2018, to May 31, 2021…
Characterizing the optical nature of the blazar S5 1803+784 during its 2020 flare
A. Agarwal, Ashwani Pandey, Aykut Özdönmez +3
We report the results from our study of the blazar S5 1803+784 carried out using the quasi-simultaneous , , , and observations from May 2020 to July 2021 on 122 nights…
Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP-40 and WASP-21 systems
M. Seeliger, M. Kitze, R. Errmann +46
As part of our ongoing effort to investigate transit timing variations (TTVs) of known exoplanets, we monitored transits of the four exoplanets HAT-P-18b, HAT-P-19b, HAT-P-27b/WASP…
Galactic model parameters of cataclysmic variables: Results from a new absolute magnitude calibration with 2MASS and WISE
A. Ozdonmez, T. Ak, S. Bilir
In order to determine the spatial distribution, Galactic model parameters and luminosity function of cataclysmic variables (CVs), a -band magnitude limited sample of 263 CVs has…