SMA Observations of the Orion proplyds

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SMA Observations of the Orion proplyds
Jonathan Williams (IfA) Sean Andrews (IfA) David
Wilner (CfA)
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HST ? radii 20-100 AU VLA ? mass loss rate
10-7 M?/yr
? tevap 105 yr for MMSN (10-2 M?)
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Most solar mass stars form in Orion type
environments. But if tevap 105 yr, what are
the prospects for planet formation?
What is the mass of the inner (lt 30 AU) disk that
is bound to the star?
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Previous millimeter array observations

• - isolate individual objects
• filter out cloud emission

Need to get to shorter wavelengths!
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SMA Observations November 2004 Compact array, 341
GHz, 1.5 beam Two tracks ? 2.7 mJy/beam
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bremsstrahlung greybody (ionized gas dust)
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What about the 18 non-detections?
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Odd detection statistics ? abrupt mass loss event?
Circular or elliptical orbits? (Störzer
Hollenbach 2000)
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An SMA survey of Orion?
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An SMA survey of Orion?

• 10 tracks ?
• 20-30 detections?
• Disk mass function
• Environmental influence
• Gas content?

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David Aguilar