90 Result(s)
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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 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 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
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...
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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...
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Article
Russian–Cuban Astronomical Observatory. The “First Light” and the First Results from the Observatory
We present information about the first results of work on the study of stars at the optical station of the Russian–Cuban Observatory. The observatory consists of two stations – optical and geodynamic, created ...
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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...
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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....
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Article
First Telescope of the Russian–Cuban Observatory
Beginning of operation of the first Russian–Cuban Observatory telescope, a wide-field 20-cm robotic telescope installed at the observational site optical station in Havana, Republic of Cuba, is reported. The g...
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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...
