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Activity of TRAPPIST-1 Analogsстатья
- Авторы: Dmitrienko E.S., Savanov I.S.
- Журнал: Astronomy Letters
- Том: 48
- Номер: 11
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 668
- Последняя страница: 673
- DOI: 10.1134/S1063773722110068
- Аннотация: The planetary system of the star TRAPPIST-1 hosts seven exoplanets, three of which are inthe habitable zone. Based on published data, we have analyzed the properties of cool dwarfs that could be considered as an analog of this object. Using the data available in the literature (Seli et al. 2021) for ultracool dwarfs similar to TRAPPIST-1, we have determined their spottedness S (the fraction of the surface covered by cool spots) and the spot area in fractions of the solar surface area. We have found that, on average, TRAPPIST-1 rotates more slowly than most of the stars from the sample under consideration, while its spottedness is higher than that in them. We have investigated seven objects for which reliable information about their ages, rotation, and spot activity is available. The fraction of the TRAPPIST-1surface covered by spots has been found to exceed those for other objects, including even those for younger stars with an age of 1–3 Gyr. We have identified two objects, TIC 302408306 and TIC 366567664, with characteristics (ages, rotation) close to those of TRAPPIST-1. Their ages are estimated to be 9.0 and 7.9 Gyr, respectively. These stars rotate more rapidly than TRAPPIST-1, while the surface area covered by spots in them is slightly smaller than that in TRAPPIST-1. These objects have more stable and smoother phase curves with one minimum.
- Добавил в систему: Дмитриенко Елена Сергеевна