ELFT HÍRADÓ

[uhlar AT konkoly.hu (Karola_Uhlar)]

                                Meghívó
        az  MTA Konkoly Thege Miklós Csillagászati Kutatóintézete 
                             szemináriumára

Elõadó: Jan Budaj (Astronomical Institute of the Slovak Academy of 
Sciences, Tatranska Lomnica)

Cím: From interacting binaries to extrasolar planets

Kivonat:
In the first part of my talk I will review the most important effects and 
processes in the atmospheres of close-in giant extrasolar planets which 
may be relevant for understanding/interpreting various observations of 
transits, secondary eclipses and phase light-curves. 
In the second part I will point out similarities between interacting 
binary stars and stars with a close-in giant extrasolar planet. The 
reflection effect is a well-known example. Although the generally accepted 
treatment of this effect in interacting binaries is successful in fitting 
light curves of eclipsing binaries, it is not very suitable for studying 
cold objects irradiated by hot objects or extrasolar planets. Our model of 
the reflection effect takes into account the reflection (scattering), 
heating, and heat redistribution over the surface of the irradiated 
object. The shape of the object is described by the non-spherical Roche 
potential expected for close objects. Limb and gravity darkening are 
included in the calculations of the light output from the system. The 
model also accounts for the orbital revolution and rotation of the 
exoplanet with appropriate Doppler shifts for the scattered and thermal 
radiation. Subsequently, light curves and/or spectra of several exoplanets 
have been modelled and the effects of the heat redistribution, limb 
darkening/brightening, (non-)gray albedo, and non-spherical shape have 
been studied. It was found that departures from the spherical shape can 
reach 14% (WASP-12b).

Az elõadás idõpontja: 2011. március 17., csütörtök  14 óra 

Helye: MTA KTM CSKI elõadóterme 
Budapest, XII., Konkoly Thege M. út 15-17.