Debris disks - PowerPoint PPT Presentation

About This Presentation
Title:

Debris disks

Description:

... disks. Basic properties. Observational methods ... First disk spatially resolved: b Pictoris. Discovery image by Smith & Terrile 1984 (Sci. ... Properties ... – PowerPoint PPT presentation

Number of Views:46
Avg rating:3.0/5.0
Slides: 38
Provided by: Rene188
Category:
Tags: debris | disks

less

Transcript and Presenter's Notes

Title: Debris disks


1
Debris disks
  • Basic properties
  • Observational methods constraints
  • Why debris?
  • Structures

Alexis Brandeker, Lecture 6 in star formation
mini-course
2
Discovery of debris disks
From Backman Parece 1993, PPIII, 1253
3
Discovery of debris disks
From Backman Parece 1993, PPIII, 1253
4
First disk spatially resolvedb Pictoris
Discovery image by Smith Terrile 1984 (Sci.
226, 1421)
500 AU
5
Properties
  • Large (up to 1000 AU) dusty disks found around
    young main-sequence stars 10 Myr 1 Gyr
  • Dust disk mass M 10-3 to a few MEarth.
  • Essentially free of gas
  • Cold typically 30 300 K
  • Dominating dust emission from ?m to mm sized
    grains

6
The fabulous four at 850m
3.2 pc
7.7 pc
7.7 pc
20 pc
7
(No Transcript)
8
b Pictoris in scattered light
9
(No Transcript)
10
(No Transcript)
11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
ZAMS
20 Myr
30 Myr
Barrado y Navascués 1999
50 Myr
16
(No Transcript)
17
Why debris?
From Artymowicz 1997, AR 25175
18
? ? Frad/Fgrav
? 1
0.51
2.2
0.1
0.3
0.4
19
Top view
Orbit of Pluto-mass parent body before breakup
Side view
?
Elapsed time 21 years
Florida Dynamics Group
20
Top view
Side view
?
Elapsed time 569 years
Florida Dynamics Group
21
Subaru/COMICS
(Y.Okamoto et al. 2004)
Total (magenta) 0.1mm amorphous olivine
(green) 2mm amorphous olivine (red) Crystalline
forsterite (blue) Power-law continuum (cyan)
22
(No Transcript)
23
Dust disk lifetimes
From Haisch, Lada Lada 2001, ApJ, 553, 153
24
What about gas?
Energy diagram of H 2
Pollack et al. 1993
Total mass
30.0
Energy K
20.0
Core mass
10.0
Gas mass
25
mm/submm observations
  • Liseau Artymowicz 1998, AA 335, 935

26
Edge-on ? absorption!
27
Gas in emission
  • Sodium D1/2 lines toward b Pictoris

28
Dynamical studies...
  • Stellar structure
  • M(1.750.1)Mo
  • Gas dynamics
  • Mdyn(1.400.05)Mo

Discrepancy probably due to radiation pressure!
29
HR 4796A
30
(No Transcript)
31
(No Transcript)
32
b Pictoris in scattered light
NE
SW
33
NE
SW
24.3 ?m
FWHM
5 arcsec
18.3 ?m
100 AU
11.7 ?m
Gemini south / T-ReCS
Telesco et al. 2005
pixel
34
1.2 mm (SEST/SIMBA)
Liseau et al. 2003
35
Asymmetris in gas disk
VLT / UVES (Brandeker et al. 2004)
36
Evolution young vs. old debris
Credit M. Liu
37
StarStrider
AU
Write a Comment
User Comments (0)
About PowerShow.com