ELFT HÍRADÓ

[Uhlár Karola <uhlar AT konkoly.hu>]

*RENDKÍVÜLI INTÉZETI SZEMINÁRIUMOK*

*1.**előadás*
Előadó: *Ilaria Pascucci*** (University of Arizona)

Előadás címe: *An enhanced carbon chemistry in disks around very 
low-mass stars and brown dwarfs? **
*
Kivonat:
There is growing observational evidence that disk evolution is 
stellar-mass dependent. In this talk, I will show that these 
dependencies extend to the atomic and molecular content of disk 
atmospheres. I will summarize the main results from a unique dataset of 
high-resolution Spitzer/IRS spectra from 8 very low-mass star and brown 
dwarf disks. I will present the first detections of ionized neon, 
molecular hydrogen, carbon dioxide, and water in these disks and discuss 
implications for the heating and ionization of disk atmospheres. 
Finally, I will show that BD disks have on average higher C2H2/HCN and 
HCN/H2O line flux and column density ratios than T Tauri disks. I will 
speculate on the implications of these trends for the O/C ratio in inner 
disks and the bulk composition of rocky planets.

Előadás időpontja: *2013. június 25. (kedd), 14:00**

2. előadás
*
Előadó: *Apai Dániel* (University of Arizona)

Előadás címe: *Extrasolar Storms: Exploring Clouds and Atmospheric 
Dynamics in Brown Dwarfs and Exoplanets **
*
Kivonat:
Astronomy has entered an exciting new era when the atmospheres of 
exoplanets can be studied in detail. Observations of directly imaged 
exoplanets and brown dwarfs revealed the presence of condensate clouds 
that strongly influence the energy transport through the planetary 
atmospheres and, therefore, influence the evolution of the atmospheres 
and the emerging spectra.The physical nature and properties of these 
cloud layers remain mostly unknown, but pose one of the outstanding 
challenges in understanding ultracool atmospheres. I will introduce a 
new observing technique in this field, rotational phase mapping, that 
provides an exciting look into the atmospheres and clouds of exoplanets 
and ultracool brown dwarfs. I will discuss multiple Hubble and Spitzer 
programs, including a 1,144-hour Exploration Science program, that 
applies this new technique to a large number of targets. The data paints 
an exciting and often surprising picture on ultracool photospheres. I 
will show that the success of this observational technique also 
motivates future applications to directly imaged giant exoplanets and 
super-earths, whose photospheres and surface can be mapped in the near 
future.

Előadás időpontja: *2013. június 25. (kedd), 14:45**
*
Előadások helyszíne: MTA CSFK CSI Előadóterme
1121 Budapest, Konkoly T. M. út 15-17.
begin:vcard
fn:Karola Uhlar
n:Uhlar;Karola
org:Konkoly Observatory
adr:;;Konkoly Thege M. u. 13-17.;Budapest;;1121;Hungary
email;internet:uhlar AT konkoly.hu
title:secretary
tel;work:+3613919322
tel;fax:+3612754668
version:2.1
end:vcard