CC BY
4"Peremennye Zvezdy", vol. 24, N 1 (2024)
9 New Variable Stars in Exoplanetary Transit Fields Observed at the Caucasus Mountain Observatory
A. Tarasenkov#1'2. A. M. Zubareva#21. N. Maslennikova#1. A. Belinskii#1
#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@phvsics.msu.ru')
|# Name Other Coord rJ20001 TyP-e Max Min Svstem Period Epoch am Sp_ Comment L.Curve Find.Chart Data
GaiaDR3 518038309346130816 01 55 59.344 +64 27 55.66 EW 17.85 18.25 zr 0.4369 2458741.721 min Comm. 1 4021 3486LC.png 4021 3486FC.png 4021 3486 TESS.dat4021 3486 ztf.dat
GaiaDR3 47834223303321344 04 18 13.391 +19 06 19.76 EW 17.75 17.87 zr 0.6591 2459479.540 min Comm. 2 4634 768LC.png 4634 768FC.png 4634 768 TESS.dat 4634 768 ztf.dat
|3[ GaiaDR3 2194846077739758592 20 36 05.571 +61 06 14.43 EW 15.43 15.69 zr 0.49866 2459381.525 min Comm. 3 3923 1698LC.png 3923 1698FC.png 3923 1698 TESS.dat 3923 1698 ztf.dat
hi GaiaDR3 2194847898805996672 20 36 42.724 +61 09 56.11 EW 16.08 16.22 zr 0.48505 2458353.678 min Comm. 4 3923_2714LC.png 3923_2714FC.png 3923 2714 TESS.dat 3923 2714 ztf.dat
GaiaDR3 1871025987680298624 20 47 25.729 +37 14 10.06 EB 15.13 15.25 zr 0.8648 2459422.821 min Comm. 5 3528 1752LC.png 3528 1752FC.png 3528 1752 TESS.dat 3528 1752 ztf.dat
M GaiaDR3 1871338764374677632 20 57 45.439 +36 26 04.29 BY: 16.55 16.64 zr 0.62171 2458854.755 max Comm. 6 3558 5669LC.png 3558 5669FC.png 3558 5669 TESS.dat 3558 5669 ztf.dat
iGaia DR3 1871319660359975808 20 58 39.213+36 14 11.41 EB 16.82 16.97 TESS 0.33725 2458632.893 min Comm. 7 3558 3575LC.pne 3558 3575FC.png 3558 3575 TESS.dat 3558 3575 ztf.dat
|8 | ||Gaia DR3 1951230825428871296 21 30 34.840 +34 54 13.00 EA 16.56 17.27 zr 0.50547 2459099.685 min Comm. 8 3568_209LC.png 3568_209FC.png 3568 209 TESS.dat 3568 209 ztf.dat
Ml GaiaDR3 1950473055761063552 21 31 09.334 +34 4143.03 DSCT 14.34 14.38 zr 0.12418 2458449.569 max Comm. 9 3568 2741LC.png 3568 2741FC.png 3568 2741 TESS.dat 3568 2741 ztf.dat
Comments:
1. Minll = 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. Minll = 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. Minll = 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. Minll = 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. Minll = 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. Minll = 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. Minll = 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 SNAP 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. R 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, Al 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
