4 papers
Thermochemical constraints on a primordial-origin of gas-rich debris disks
H. Mitani, W. Ooyama, R. Nakatani +2
Recent observations have revealed gas-rich debris disks around intermediate-mass stars at ages of tens of Myr. The origin of this gas remains unclear: it may be primordial, retaine…
Analytical modeling of helium absorption signals of isothermal atmospheric escape
Hiroto Mitani, Rolf Kuiper
Atmospheric escape driven by extreme ultraviolet (EUV) radiation is a critical process shaping the evolution of close-in exoplanets. Recent observations have detected helium triple…
Secret of Longevity: Protoplanetary Disks as a Source of Gas in Debris Disks
Wataru Ooyama, Riouhei Nakatani, Takashi Hosokawa +2
While protoplanetary disks (PPDs) are generally thought to disperse within several million years, recent observations have revealed gas in their older counterparts, debris disks. T…
Physically motivated analytic model of energy efficiency for EUV-driven atmospheric escape of close-in exoplanets
Hiroto Mitani, Riouhei Nakatani, Rolf Kuiper
Extreme Ultraviolet (EUV) driven atmospheric escape is a key process in the atmospheric evolution of close-in exoplanets. In many evolutionary models, the energy-limited mass-loss…