Astron. J., 159, 275-275 (2020/June-0)
A coupled analysis of atmospheric mass loss and tidal evolution in XUV irradiated exoplanets: the TRAPPIST-1 case study.
BECKER J., GALLO E., HODGES-KLUCK E., ADAMS F.C. and BARNES R.
Abstract (from CDS):
Exoplanets residing close to their stars can experience evolution of both their physical structures and their orbits due to the influence of their host stars. In this work, we present a coupled analysis of dynamical tidal dissipation and atmospheric mass loss for exoplanets in X-ray and ultraviolet (XUV) irradiated environments. As our primary application, we use this model to study the TRAPPIST-1 system and place constraints on the interior structure and orbital evolution of the planets. We start by reporting on an ultraviolet continuum flux measurement (centered around ∼1900 Å) for the star TRAPPIST-1, based on 300 ks of Neil Gehrels Swift Observatory data, and which enables an estimate of the XUV-driven thermal escape arising from XUV photodissociation for each planet. We find that the X-ray flaring luminosity, measured from our X-ray detections, of TRAPPIST-1 is 5.6 x 10–4 L*, while the full flux including non-flaring periods is 6.1 x 10–5 L*, when L* is TRAPPIST-1's bolometric luminosity. We then construct a model that includes both atmospheric mass loss and tidal evolution and requires the planets to attain their present-day orbital elements during this coupled evolution. We use this model to constrain the ratio Q′ =3Q/2k2 for each planet. Finally, we use additional numerical models implemented with the Virtual Planet Simulator VPLanet to study ocean retention for these planets using our derived system parameters.
© 2020. The American Astronomical Society. All rights reserved.
Exoplanets - Extrasolar rocky planets - Exoplanet atmospheres - Exoplanet structure
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