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  1. No Access

    Article

    Mass Loss from the Atmosphere of the Planet TOI-1442 c

    The properties of the planetary system TOI-1422, in which two planets of a neptune type orbit around a low-activity star of solar type with an age of about 5 billion years, are examined. We have previously ana...

    E. S. Dmitrienko, I. S. Savanov in Astrophysics (2024)

  2. No Access

    Article

    Activity of the Star TOI-784 and Loss of Atmospheric Mass by Its Planet

    The properties of the planetary system TOI-784, in which an earth-like planet orbits a low-activity star of solar type, are examined. Archived V-band measurements of the brightness of TOI-784 in the ASAS 4 dat...

    I. S. Savanov in Astrophysics (2024)

  3. No Access

    Article

    Mass Loss from the Atmosphere of the Planet WASP-193 b

    Results are presented from an analysis of the manifestations of activity of the star WASP-193 of spectral class F9 with a super-neptune-type planet. The gaseous giant WASP-193 b with a mass 0.13 times Jupiter’...

    I. S. Savanov in Astrophysics (2023)

  4. No Access

    Article

    Activity of the Young Solar Analog HD 109833 and Estimates of the Mass Loss Rate from the Atmospheres of Its Two Planets

    We present the results of our analysis of the manifestations of activity in the young solar analog HD 109833 and estimate the mass loss rate from the atmospheres of its two planets. HD 109833 probably belongs ...

    I. S. Savanov in Astronomy Letters (2023)

  5. No Access

    Article

    Activity of the Young Star EPIC 204376071 from the Upper SCO Association

    Based on observations from the K2 mission of the Kepler Space Telescope a study is made of the activity of EPIC 204376071, a young object in the Upper SCO association with an age of 11±3 million years whose li...

    I. S. Savanov in Astrophysics (2023)

  6. No Access

    Article

    Activity of the Star Gl 414A with Two Planets and its Effect on the Loss of Mass of the Atmosphere of the Planet Gl 414A b

    Results are presented from a study of manifestations of the activity of the dwarf Gl 414A of spectral class K7 with two planets, one of which (the planet Gl 414A b) with an eccentricity e=0.45 was found to be ...

    I. S. Savanov in Astrophysics (2023)

  7. No Access

    Article

    Spottedness Activity of the Young Star HIP 94235 from the Moving Group AB Doradus

    Based on high-precision data from the archive of the TESS space mission, a study is made of the photometric variability of the brightness of HIP 94235, a bright star belonging to the 120 million years old movi...

    I. S. Savanov in Astrophysics (2022)

  8. No Access

    Article

    Activity of TRAPPIST-1 Analogs

    The planetary system of the star TRAPPIST-1 hosts seven exoplanets, three of which are in the habitable zone. Based on published data, we have analyzed the properties of cool dwarfs that could be considered as...

    E. S. Dmitrienko, I. S. Savanov in Astronomy Letters (2022)

  9. No Access

    Article

    Activity of Stars with Planets in the Habitable Zone

    Based on data on stars with planets located in the habitable zone, a study is made of manifestations of their activity. Light curves obtained during observations in the Q3 set with the Kepler Space Telescope f...

    I. S. Savanov in Astrophysics (2022)

  10. No Access

    Article

    Activity of the Young Star with an Exoplanet Kepler-1627

    Based on data from the Kepler Space Telescope archive, we have studied the photometric variability of the young solar analog Kepler-1627, a G8V-type star with a planet of 3.777 Earth radii in size and an orbit...

    I. S. Savanov in Astronomy Letters (2022)

  11. No Access

    Article

    Spottedness Activity of the Young Star TOI 1227 with a Planetary System from Lower Centaurus Crux OB Association (Musca)

    Based on high-precision data from the archive of the TESS space mission, a study of the photometric variability of the brightness of TOI 1227, a young member of the Musca group with an age of 11 million years....

    I. S. Savanov in Astrophysics (2022)

  12. No Access

    Article

    Coronae of an active fast rotator FR Cnc

    We present the first detailed X-ray study and simultaneous optical observations of the active fast rotating star FR Cnc. The X-ray spectra are found to be explained by two-temperature plasma model with tempera...

    Jeewan C. Pandey, Gurpreet Singh… in Journal of Astrophysics and Astronomy (2021)

  13. No Access

    Article

    KIC 7732964 – A Possible Candidate FK Com-Type Star

    This article is a brief survey of our previous work devoted to searching for candidate type FK Com giant stars and an analysis of data for yet another new candidate, KIC 7732964. Establishing that KIC 7732964 ...

    E. S. Dmitrienko, I. S. Savanov, V. B. Puzin in Astrophysics (2021)

  14. No Access

    Article

    Activity of Two Young Stars of Solar Type with Planetary Systems from the Ursa Major Moving Group of Stars and the Stream Psc-Eri

    High precision data from the archive of the TESS space mission are used as the basis of a study of the photometric variability of two young analogs of the Sun with planetary systems: the stars HD 63433 (TOI 17...

    I. S. Savanov in Astrophysics (2021)

  15. No Access

    Article

    Activity of the Star AB Pic with an Exoplanet from the Young Tuc–Hor Association

    Based on highly accurate data from the archive of the TESS space mission, we have studied the photometric variability of the K1-type dwarf AB Pic (HD 44627), which is a member of the Tuc–Hor association and po...

    I. S. Savanov in Astronomy Letters (2021)

  16. No Access

    Article

    Conceptual Design of the Chinese-Russian On-Orbit-Assembling Space Telescope (OAST)

    Astronomical space telescopes with large apertures of various spectral ranges have become one of the main tools of exploring the Universe. Conventional technologies do not allow increasing the space telescope ...

    Xu Boqian, Yu Funan, A. S. Shugarov, M. E. Sachkov, I. S. Savanov… in Solar System Research (2020)

  17. No Access

    Article

    On the Properties of Coronal Mass Ejections on Late-Type Stars

    The technique of coronal mass ejection (CME) mass estimates from the energy of stellar flares has been applied to the data on the flare activity of late-type stars. In this study we use the data from catalogs ...

    I. S. Savanov in Astronomy Letters (2020)

  18. No Access

    Article

    Differential Rotation of Stars in Spectral Class A

    Published data indicate a substantial increase in the differential rotation parameter ∆Ω of stars hotter than 6700 K. By analyzing the shape of the light curves and the presence of a specific set of peaks in t...

    I. S. Savanov, E. S. Kalinicheva, E. S. Dmitrienko in Astrophysics (2020)

  19. No Access

    Article

    Slowly Rotating Ap Stars, Prospects for Observing Them with the Tess Space Mission

    The feasibility of detecting candidate slow-rotating magnetic Ap stars with periods from a few tens of days to several hundred years is considered. The question of the fraction of objects of this kind among al...

    I. S. Savanov in Astrophysics (2020)

  20. No Access

    Article

    Activity of a Young Solar Analog—the Star with an Exoplanet DS Tuc

    We present the results of our analysis of the photospheric and chromospheric activity of the star DS Tuc (DS Tuc A, HD 222259A), which is a member of the Tucana–Horologium (Tuc–Hor) group with an age of 45 Myr...

    I. S. Savanov, E. S. Dmitrienko in Astronomy Letters (2020)

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