| Article in PDF |
"Peremennye Zvezdy", Prilozhenie, vol. 24, N 1 (2024) |
| #1. Sternberg Astronomical Institute, Moscow State University, Moscow, Russia;
#2. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia. |
| ISSN 2221–0474 | DOI: 10.24412/2221-0474-2024-24-1 |
Received: 20.10.2023; accepted: 1.02.2024
(E-mail for contact: tarasenkov.an20@physics.msu.ru)
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Comments:
1. MinII = 18m.15. Detected in the field of exoplanetary transit TOI 4021.01; observed by NM and AT on 2022-09-17. TESS photometry from sectors 52 and 58.
2. MinII = 17m.86. Detected in the field of TOI 4634.01; observed by AT on 2022-12-16 and by NM on 2021-12-04 and 2022-01-20. TESS photometry from sectors 43 and 44.
3. MinII = 15m.68. Detected in the field of TOI 3923.01; observed by NM on 2021-12-29 and 2022-04-07. TESS photometry from sectors 15, 17, 24, 55, 56, and 57.
4. MinII = 16m.20. Detected in the field of TOI 3923.01; observed by NM on 2021-12-29 and 2022-04-07. TESS photometry from sectors 15, 17, 24, 55, 56, and 57.
5. MinII = 15m.19. Detected in the field of TOI 3528.01; observed by NM on 2022-12-06. TESS photometry from sectors 41 and 55.
6. Detected in the field of TOI 3558.01; observed by NM and AT on 2022-07-31. TESS photometry from sectors 15, 41, and 55.
7. MinII = 16m.94. Detected in the field of TOI 3558.01; observed by NM and AT on 2022-07-31. TESS photometry from sectors 15, 41, and 55.
8. MinII = 16m.75. D = 0.23 P. Detected in the field of TOI 3568.01; observed by AT on 2022-12-31. TESS photometry from sector 15. Mentioned as eclipsing binary candidate ATO J322.6451+34.9036 in the ATLAS variable stars catalog (Heinze et al., 2018).
9. Detected in the field of TOI 3568.01; observed by AT on 2022-12-31. TESS photometry from sectors 15, 55, and 56.Remarks:
We report the discovery of nine new variable stars as a by-product of high-precision photometry of exoplanetary transits. The initial datasets were obtained with the RC600 telescope of the Caucasus Mountain Observatory of the Sternberg Astronomical Institute, equipped with an Andor iKon-L CCD camera (Berdnikov et al., 2020). For each field we used time series of transit observations to detect variable objects by means of the VaST software package (Sokolovsky and Lebedev, 2018). Suspected targets not listed as known variables in the VSX database were selected for further study. Unfortunately, the lenght of the time intervals of the RC600 data was enough only to pick potentially interesting stars, but not to derive their light elements. To overcome this, we collected ZTF photometry (Bellm et al., 2019; Masci et al., 2019) using the SNAD ZTF viewer (Malanchev et al., 2023) and TESS data (Ricker et al., 2014), that were processed using the Lightkurve library algorithms (Lightkurve Collaboration, 2018). In total, we discovered nine variable stars showing identical periods according to ZTF and TESS data. Each of them are identified with sources from Gaia DR3 (Gaia Collaboration, 2023). We derived periods with the help of the WinEfk tool developed by Dr. V. P. Goranskij.
Acknowledgments: The authors are grateful to Dr. V. P. Goranskij and Dr. K. V. Sokolovsky for providing their software. This research has made use of the International Variable Star Index (VSX) database, operated at AAVSO, Cambridge, Massachusetts, USA. This research made use of Lightkurve, a Python package for Kepler and TESS data analysis (Lightkurve Collaboration, 2018).References:
Bellm, E. C., Kulkarni, S. R., Graham, M. J., et al., 2019, Publ. Astron. Soc. Pacific, 131, 018002
Berdnikov, L. N., Belinskii, A. A., Shatskii, N. I., et al., 2020, Astron. Rep., 64, 310
Gaia Collaboration, Vallenari, A., Brown, A. G. A., et al., 2023, Astron. Astrophys., 674, A1
Heinze, A. N., Tonry, J. L., Denneau, L., et al., 2018, Astron. J., 156, 5, 49
Lightkurve Collaboration, Cardoso, J. V. d. M., Hedges, C., et al., 2018, Astrophys. Source Code Lib.
Malanchev, K., Kornilov, M. V., Pruzhinskaya, M. V., et al., 2023, Publ. Astron. Soc. Pacific, 135, 1044
Masci, F. J., Laher, R. R., Rusholme, B., et al., 2019, Publ. Astron. Soc. Pacific, 131, 995
Ricker, G. R., Winn, J. N., Vanderspek, R., et al., 2014, Proc. of the SPIE, 9143, 15
Sokolovsky, K. V. and Lebedev, A. A., 2018, Astron. Computing, 22, 28
