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- Title
Mass Loss from the Atmosphere of the Planet WASP-193 b.
- Authors
Savanov, I. S.
- Abstract
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's mass and almost one and a half times its radius. The planet has a low density ρ = 0.059±0.014 g/cm3 (Kepler 51 d is an analogous object; there are few other exoplanets of this type). The equilibrium temperature of the atmosphere of the planet is high at Teq = 1254±31 K. The results of this study of the star's activity are used to estimate the loss of matter by the atmosphere of the planet WASP-193 b using an approximation formula corresponding to a model with limited energy. Estimates of the flux of XUV-photons FXUV were made using an analytical relationship relating FXUV and the parameter log R HK ′ for stars in classes F-M. Calculations showed that the loss of matter from the atmosphere of the exoplanet is quite high (even in the case of a low chromospheric activity of the parent star). The parameter M ˙ ranges from 1.8∙1010 g/s to 4.3∙1011 g/s, depending on the assumed level of the flux of XUV-photons (high and low activity). It is probable that the planet is losing its atmosphere intensively. WASP-193 b can be regarded as a high-priority candidate for observations using the JWST space mission (the transmission spectroscopy metric TSM for this object is about 600).
- Subjects
KEPLER, Johannes, 1571-1630; PLANETARY atmospheres; GAS giants; STARS; EXTRASOLAR planets; PLANETARY systems
- Publication
Astrophysics, 2023, Vol 66, Issue 4, p463
- ISSN
0571-7256
- Publication type
Article
- DOI
10.1007/s10511-024-09803-8