[Alumnos] HOY 13:00 hs. Seminario FCAG: Dr. rer. Nat. Veronika Schaffenroth

[Secretaría de Ciencia y Técnica]

*Estimados,*

**En el día de hoy tendremos el siguiente Seminario *a las 1*3*:*0*0 hs. 
en el Salón Meridiano. Los esperamos 15 minutos antes **con café y 
galletitas.

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Secretaría de Ciencia y Técnica
FCAG*

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***Seminario: Dr. rer. Nat.Veronika Schaffenroth***

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Institut für Physik und Astronomie, Universität Potsdam


Título:The EREBOS project: Studying the influence of substellar objects 
on late stellar evolution.


Resumen: Planets and brown dwarfs in close orbits will interact with 
their host stars, as soon as they evolve to become red giants. However, 
the outcome of those interactions is still unclear. Recently, several 
brown dwarfs have been discovered orbiting hot subdwarf stars in very 
short orbital periods of 0.065 - 0.096 d. More than 6% of those stars 
might have close substellar companions. This shows that such companions 
can significantly affect late stellar evolution and that sdB binaries 
are ideal objects to study this influence. More than a hundred new 
eclipsing sdB binary systems with cool low-mass companions with periods 
from 0.05 to 0.5 d were discovered based on their lightcurves by the 
OGLE project. We want to use this unique and homogeneously selected 
sample to derive the mass distribution of the companions, constrain the 
fraction of substellar companions and determine the minimum mass needed 
to strip of the red-giant envelope. We are especially interested in 
testing models that predict hot Jupiter planets as possible companions. 
Therefore, we started the EREBOS (Eclipsing Reflection Effect Binaries 
from the OGLE Survey), which aims at analyzing as many of the newly 
discovered HW Vir systems as possible based on a spectroscopic and 
photometric follow-up of all targets. For this we were granted with an 
ESO Large Program for ESO/VLT-FORS. Here we will introduce the project 
and give the current status together with the first results.

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