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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...
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Article
Activity of K-Dwarf HIP 113103 and Atmospheric Losses of Its Exoplanets
We present the results of analyzing the activity manifestations of the K3 V spectral type dwarf HIP 113103 (HD 216530) and estimate the matter loss from the atmospheres of two of its planets. HIP 113103 can be...
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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...
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Article
Activity of M-dwarf L 98-59 and Atmospheric Escape of its Exoplanets
A study of the activity of a bright M-dwarf L 98-59, located at a distance of 10.6 pc from Earth is reported. The star has a multiplanetary system, where one of the planets, L 98-59 b, is a rocky planet with a...
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Article
Activity Cycles of the Star FK Com
We present the results of our photometric observations of the chromospherically active star FK Com (prototype of its group of stars) acquired during the recent 5 years (2018–2023) at the INASAN observatories i...
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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’...
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Article
Open AccessActivity Cycles of a Single G5 III–IV Giant HD 199178
We obtained a unique series of photometric data for more than a hundred years for a rapidly rotating single G5 III–IV giant HD 199178 (V1794 Cyg), belonging to FK Com type stars. The analysis of the long-term ...
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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 ...
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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...
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Article
Open AccessThe Activity of a Solar-Type Star TOI-1422 and Mass Loss of the Atmosphere of the Planet TOI-1422b
The results of the analysis of the activity of a solar type star G2V TOI-1422 are presented and estimates of the loss of atmospheric matter of the planet TOI-1422b are made. The planet can be attributed to the...
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Article
Long Magnetic Minimum of HD 166620—Possible Beginning of the Analog of the Maunder Minimum
Based on photometric observations published in the literature, the manifestations of the activity of the K2 V dwarf HD 166620 were studied. The obtained results are compared with the results of the analysis of...
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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 ...
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Article
Analysis of the Activity of 11 K-type Dwarfs with Planets in the Habitable Zone
We report the results of a study of spot activity manifestations in 11 K-type dwarfs with established planets in the habitable zone according to the data from the Kepler space telescope archive acquired during...
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Article
HD 4915 at the Beginning of Maunder Minimum of Activity
Based on the available photometric data spanning almost 8000 days (21.9 years) of observations of a bright G5 V dwarf, solar-type star HD 4915, we carried out a study of the manifestations of its activity, pro...
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Article
Activity of ET Dra—a Star of FK Com Type
Abstract—We present new results of the study of ET Dra—a star of the FK Com type—based on observations carried out at the Zvenigorod Observatory of the Institute of Astronomy of RAS with the help of the FRAM-ORM ...
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Article
Activity of the Young Star TOI 837 with an Exoplanet
Abstract—Based on high-precision data from the archive of the TESS space mission, a study was made of the photometric brightness variability of TOI 837—a young star with an exoplanet, a member of the southern sky...
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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...
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Article
The Rate of Atmospheric Mass Loss by the Hot Neptune GJ 436b
This paper presents the results of modeling the upper atmosphere of the exoplanet GJ 436b, performed using a previously developed one-dimensional self-consistent aeronomic model. The model used considers the c...
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Article
KIC 2142183 as a FK Com Star Candidate
The star KIC 2142183, which was previously noted as a rapidly rotating giant with flare activity, was studied based on the analysis of photometric observations with the Kepler space telescope. We have estimate...
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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...
