Открыта любопытная система из трех экзопланет

Используя обсерваторию NASA TESS, астрономы смогли открыть систему TOI-270, которая находится на расстоянии 73 световых года от нас. Она интересна тем, что имеет три экзопланеты. Сама звезда относится к старым красным карликам и имеет размер всего в 40 процентов от солнечного.

Экзопланета TOI-270b примерно в 1,25 раза больше Земли, она скалистая и имеет орбитальный период в 3,4 дня. Две другие экзопланеты относятся к категории суб-Нептунов – это промежуточный вид планет, которых нет в нашей системе, но которые довольно распространены в других системах. Один из суб-Нептунов в 2,42 раза больше Земли, другой – в 2,13 раза больше. Большая планета имеет орбитальный период 5,7 дня, а меньшая – 11,4 дня.

Для астрономов интересно то, что все три планеты имеют приливной захват, то есть повернуты всегда к звезде одной стороной. Их стабильные орбиты позволят астрономам изучить атмосферы планет, а также больше узнать о суб-Нептунах, которых у нас нет. Исследование системы позволит понять лучше эволюцию планет и переход от стадии супер-Земель к суб-Нептунам. Также есть подозрение, что у одного из суб-Нептунов есть экзолуна. Особый интерес вызывает орбитальный резонанс, который существует между всеми тремя планетами.

Например, резонанс между TOI-270b и TOI-270с составляет 5:3, а резонанс TOI-270с и TOI-270d – 2:1. Эта особенность позволит лучше понять орбитальную механику для планетных систем, а также даст шанс вычислить другие планеты, которые расположены дальше от звезды, возможно, в зоне обитаемости.

Source: www.nature.com/…

#exoplanet@nasa_vk #экзопланета@nasa_vk #TESS@nasa_vk

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