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csillagda szemin�riuma - eml�keztet�

Chronological Thread 
  • From: uhlar AT (Karola_Uhlar)
  • To: fizinfo AT
  • Subject: csillagda szeminriuma - emlkeztet
  • Date: Wed, 16 Mar 2011 11:05:32 +0100 (CET)
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  • List-id: ELFT HÍRADÓ <>

az MTA Konkoly Thege Miklós Csillagászati Kutatóintézete

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

Cím: From interacting binaries to extrasolar planets

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.

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