Your  learning  goals  for  extrasolar  planets  FS  2016    

•  What is the current status of exoplanet research? How many planets do we know? What are their properties?

•  How can exoplanets be detected and characterized? What are the technical limitations?

•  Why is exoplanet research interesting and popular? What is the main motivation for exoplanet research?

•  Being able to link personal background to exoplanet research

•  Get input concerning exoplanets as potential future research field

•  Learn more about the physics of planets and their formation

Mo6on  of  the  sun  as  seen  from  10  pc  

In-­‐class  ac6vity  (1)  1) Assume Jupiter orbits at 5 AU around the Sun in an eccentric orbit with e=0.5. Where does the planet spend most of its time? A)  Close to periastron B)  Close to apastron C)  Same everywhere on its orbit D)  Need more information to answer this question

2) In another planetary system an Earth-like planet orbits in exactly the same orbit around a star that has exactly the same properties as the star in the Jupiter-system described above. Compared to that Jupiter one year for the twin-Earth is A)  Shorter B)  Longer C)  The same

51  Peg  b  detec6on  by  Mayor  and  Queloz  

G5 V star P = 527 days K = 97 m/s e = 0.90 MP sin i = 1.56 MJ a sin i = 1.28 plus long period >20 year brown dwarf or low mass star

Highly  eccentric  orbit    Tamuz  et  al.  2008,  A&A  480,  L33  

 

Mul6planet  system    HD40307  

Mayor  et  al.  2009,  A&A  493,  639  

 

Radial  velocity  measurements  and  the  absorp6on  lines  in  the  solar  spectrum    

HARPS echelle spectrograph

HARPS cross- dispersed echelle spectrum

RV-­‐method:  disturbing  oscilla6ons  Example:  F-­‐star  Procyon  

RV-­‐method:  disturbing  ac6vity  Example:  α  Cen  B  

Star  spots