Close-in sub-Neptunes reveal the past rotation history of their host stars: atmospheric evolution of planets in the HD3167 and K2-32 planetary systems
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https://iopscience.iop.org/article/10.3847/1538-4357/ab1e42/pdfhttps://elib.sfu-kras.ru/handle/2311/129826
Author:
Kubyshkina, D.
Cubillos P. E
Fossati, L.
Erkaev, N. V.
Johnstone C. P
Kislyakova, K. G.
Lammer, H.
Lendl, M.
Odert, P.
Güdel, M.
Corporate Contributor:
Политехнический институт
Кафедра прикладной механики
Date:
2019-07Journal Name:
Astrophysical JournalJournal Quartile in Scopus:
Q1Journal Quartile in Web of Science:
Q1Bibliographic Citation:
Kubyshkina, D. Close-in sub-Neptunes reveal the past rotation history of their host stars: atmospheric evolution of planets in the HD3167 and K2-32 planetary systems [Текст] / D. Kubyshkina, Cubillos P. E, L. Fossati, N. V. Erkaev, Johnstone C. P, K. G. Kislyakova, H. Lammer, M. Lendl, P. Odert, M. Güdel // Astrophysical Journal. — 2019. — Т. 879 (№ 1).Abstract:
Planet atmospheric escape induced by high-energy stellar irradiation is a key phenomenon shaping the structure and evolution of planetary atmospheres. Therefore, the present-day properties of a planetary atmosphere are intimately connected with the amount of stellar flux received by a planet during its lifetime, thus with the evolutionary path of its host star. Using a recently developed analytic approximation based on hydrodynamic simulations for atmospheric escape rates, we track within a Bayesian framework the evolution of a planet as a function of stellar flux evolution history, constrained by the measured planetary radius. We find that the ideal objects for this type of study are close-in sub-Neptune-like planets, as they are highly affected by atmospheric escape, and yet retain a significant fraction of their primordial hydrogen-dominated atmospheres. Furthermore, we apply this analysis to the HD 3167 and K2-32 planetary systems. For HD 3167, we find that the most probable irradiation level at 150 Myr was between 40 and 130 times solar, corresponding to a rotation period of {1.78}-1.23+2.69 days. For K2-32, we find a surprisingly low irradiation level ranging between half and four times solar at 150 Myr. Finally, we show that for multi-planet systems, our framework enables one to constrain poorly known properties of individual planets.
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