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What can comets tell us about the early S.S.?. Comet Hale-Bopp. Deep Impact (Comet Tempel 1). Ge/Ay133. Sharp drop off suggests a min ~1.7 x 10 4 AU, unlikely to be bound over S.S. history?. How are bodies placed into the Oort Cloud? Jupiter most important dynamically,

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Presentation Transcript
slide1

What can comets tell us about the early S.S.?

Comet Hale-Bopp

Deep Impact

(Comet Tempel 1)

Ge/Ay133

slide5

Sharp drop off suggests amin~1.7 x 104 AU,

unlikely to be bound over S.S. history?

slide6

How are bodies placed into the Oort Cloud?

Jupiter most important dynamically,

but Neptune is the most efficient.

what are comets made of dust ice 1
What are comets made of? Dust/ice~1

HH46 W33A Hale-Bopp

Water 100 100 100

CO 20 1 23

CO2 30 3 6

CH4 4 0.7 0.6

H2CO … 2 1

CH3OH 7 10 2

HCOOH 2 0.5 0.1

NH3 9 4 0.7

OCS … 0.05 0.4

Spitzer+Keck studies are mapping out both gas phase & grain mantle

composition, comparable to that found in massive YSOs, comets.

How are these ice components determined?

slide11

ISO spectra:

Infrared spectroscopy gives

access to pivotal non-polar

species (CO2, CH4), and in

many cases, water.

Water “spin” temp.~25 K

slide12

Ground-based data can

also provide constraints,

on a much larger number

of comets, but must

fight through the Earth’s

atmosphere!

slide15

What about “exo-zodii’s? That is, dust in ~1 AU range?

Rare!

Only one

convincing

case so far,

in large

aperture

searches.

Need to get

closer to the

star….

Beichman et al., ApJ, 626, 1061

slide16

Astronomically,

we only have

spectroscopy to

probe the dust.

slide17

IDPs can be analyzed in the lab!

Comet dust assembled from sub-

micron sized components.

slide18

Samples of

known

provenance!

slide19

Crystalline silicates do seem

to be formed in the inner parts

of disks. How to transport to

comet-forming zone (>10 AU)?

slide20

FEBs = Falling Evaporative Bodies

See transient redshited absoprtion against

stellar continuum. Evaporating comets?

For the brightest sources (e.g. b Pic), you

can actually image things like Na I line

emission and map the disk.

slide21

Sun-grazing comets as seen by SOHO (look for “metals”):

http://sohowww.estec.esa.nl/bestofsoho/Movies/movies2.html#comets