View
217
Download
1
Embed Size (px)
Citation preview
New Observational New Observational Constraints on the Constraints on the Mass-Loss History Mass-Loss History
of SN 1987Aof SN 1987A
Ben E. K. SugermanBen E. K. SugermanColumbia UniversityColumbia University
Arlin Crotts, Steve Lawrence, Arlin Crotts, Steve Lawrence, Bill Kunkle, Steve HeathcoteBill Kunkle, Steve Heathcote
Project GoalProject Goal
• Make the most complete 3-D map of the surround-ing CSM
• Build an observational base to allow more thorough models of the mass-loss history
• a.k.a. Stellar Archeology or Paleontology
SN 1987A
Star 3
Star 2
ER
NOR
SOR
ConclusionsConclusions
Ground-based field of Ground-based field of viewview
• Narrow-band continuum imaging
• Continuous coverage from 1988 - present
PSF-matched difference PSF-matched difference imagingimaging
Scattered Light EchoesScattered Light Echoes
Light echoes give Light echoes give exactexact 3-D positions 3-D positions Only assumption/uncertainty is Only assumption/uncertainty is
distance to sourcedistance to source Sugerman 2003 (astro-ph/0307254; Oct ‘03 Sugerman 2003 (astro-ph/0307254; Oct ‘03 AJAJ))
Echo structures up to Echo structures up to rr=30 ly=30 ly
• Inner HourglassInner Hourglass
• Inner Inner CSMCSM
• Napoleon’s HatNapoleon’s Hat
• RSG/MS RSG/MS Contact Contact DiscontinuityDiscontinuity
Contact DiscontinuityContact Discontinuity
Napoleon’s HatNapoleon’s Hat
Hourglass & BSG CSMHourglass & BSG CSM
Filling in the gaps…Filling in the gaps…
Independently determine the Independently determine the orientation of each structureorientation of each structure
Assume each structure is Assume each structure is cylindrically symmetriccylindrically symmetric
Revolve average profile about axis, Revolve average profile about axis, reflect about equatorreflect about equator
RSG outflowsRSG outflows
BSG OutflowsBSG Outflows
The Inner Hourglass The Inner Hourglass OnlyOnly
A cross-sectional profileA cross-sectional profile
11 ly11 ly21 ly21 ly
2-4 ly2-4 ly
4 ly4 ly4 ly4 ly
2 ly2 ly
PropertiesProperties
Total mass of 1.7 MTotal mass of 1.7 Moo
RSG mass loss of 5x10RSG mass loss of 5x10-6-6 M Moo yr yr-1-1
Structures are offset from SNStructures are offset from SN Structures have elliptical cross-Structures have elliptical cross-
sectionsection
A formation model?A formation model?
Martin & Arnett Martin & Arnett 19951995
Fast BSG wind Fast BSG wind impacting impacting previously-previously-ejected slow ejected slow RSG windRSG wind
Solution: Two Blue LoopsSolution: Two Blue Loops
• 2 Blue Loops: 1st is 10x longer than 2nd
• Self-Similar WBB + shock focusing
• Equator: WCD??
Ask me about…Ask me about…
Dust gets larger with Dust gets larger with rr Dust Silicate:Carbon decreases with Dust Silicate:Carbon decreases with rr
OR positionsOR positions
• OR positions determined as intersection of 2-D positions with CS hourglass
• NOR is 1.3 ly away, SOR is 1.1 ly away