Observing Jets in Young Stellar Objects with AMBERVLTI

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Observing Jets in Young Stellar Objects with
AMBER/VLTI

• Carla S. C. Gil
• Supervisor Professor M. Teresa Lago
  (CAUP)
• Co-supervisors Dr. Markus Schoeller (ESO)
• Dr. Paulo Garcia (CAUP)
• Dr. Fabien Malbet (LAOG)

Santiago 2004/04/29 ESO Science Days
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Outline

• AMBER the 3 beam combiner for the VLTI
• Assembly, Integration and Verification (AIV)
  first sky fringes at Paranal
• Observing jets in YSOs with AMBER/VLTI
• Perspectives

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VLTI
Telescopes
Delay Lines
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Astronomical Multi-BEam Recombiner
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AMBER Layout
Calibration Unit
K spatial filter
Bypass
Anamorphoser
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Assembly, Integration and Verification of AMBER
AMBER was sucessfully installed in Paranal after
3 weeks of work. The last 2 weeks of AIV were
dedicated to stability tests and finding first
stellar fringes. The stability results one can
see here correspond to data obtained in the lab,
in medium spectral resolution and K band.
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The first fringes were obtained with the
siderostats in low spectral resolution on the
star Theta Cen (K-0.2), but they were not
recorded. First recorded fringes on Sirius, March
23 2004.
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Observing jets in YSOs with AMBER/VLTI
Understanding the physical mechanisms by which
mass is ejected from protostellar system and
collimated into jets.
Is the ejection taking place from the - star -
disk - star-disk interaction zone?
Is ejection a stationary phenomenon or a time
dependent one?
Is ejection magneto-centrifugal, or is helped by
a disk corona heating the gas?
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Solving the problem with AMBER

• Only two models do make observational
  predictions X-winds (Shu et al. 2000) and
  disk-winds models (Konigl and Pudritz 2000).

SIMILARITIES
DIFFERENCES

• Region where the jet is originated
• - The disk
• - The star-disk interaction

Both assume that ejection is - Stationary -
Magneto-centrifugal
Current angular resolutions (AO/HST) can not
differentiate between models
Need for high angular resolution in order to
resolve the jet engine.
Need AMBER!
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Perspectives

• First interferometric data will be obtained next
  week at the Infrared Optical Telescope Array (Mt.
  Hopkins).
• AMBER data from the first comissioning in May?
• MIDI Observing proposal for Period 74
• ... Finish my PhD!!

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Thank you for your attention!