The Slowly Fading Light Echo Around Type Ia Supernova 2009ig
Charlotte Wood, Peter Garnavich, Peter Milne, Dina Drozdov February 25, 2019
Midwest Workshop on Supernovae and Transients - Session 3 Table of contents
1. An Introduction to Light Echoes
2. Which Supernovae Have Light Echoes?
3. SN 2009ig Observations & Results
4. What’s Next?
1 An Introduction to Light Echoes What is a light echo?
A light echo is the scattering of light by dust into our line of sight
Credit: ESA/Hubble 2 Geometry of Light Echoes
Credit: Patat 2005 3 Superluminal expansion?
Credit: ESA/Hubble, STScI 4 What can light echoes tell us about supernovae?
• 3-D picture of the local dust • Symmetry of explosion distribution • Type • Distance
Credit: S. Heinz et al. 5 SN 1987A
Credit: ESA/Hubble, ESO 6 Which Supernovae Have Light Echoes? • Properties of SNe Ia are related to their environment • Affects cosmological parameters • Hints at progenitors
• Light echoes do occur around SNe Ia, but are rare • Why does this matter?
Which supernovae have light echoes?
• Generally found around core-collapse supernovae
Credit: Filippenko et al. 1992 7 • Properties of SNe Ia are related to their environment • Affects cosmological parameters • Hints at progenitors
• Why does this matter?
Which supernovae have light echoes?
• Generally found around core-collapse supernovae • Light echoes do occur around SNe Ia, but are rare
Credit: Filippenko et al. 1992 7 • Properties of SNe Ia are related to their environment • Affects cosmological parameters • Hints at progenitors
Which supernovae have light echoes?
• Generally found around core-collapse supernovae • Light echoes do occur around SNe Ia, but are rare • Why does this matter?
Credit: Filippenko et al. 1992 7 • Affects cosmological parameters • Hints at progenitors
Which supernovae have light echoes?
• Generally found around core-collapse supernovae • Light echoes do occur around SNe Ia, but are rare • Why does this matter? • Properties of SNe Ia are related to their environment
Credit: Filippenko et al. 1992 7 • Hints at progenitors
Which supernovae have light echoes?
• Generally found around core-collapse supernovae • Light echoes do occur around SNe Ia, but are rare • Why does this matter? • Properties of SNe Ia are related to their environment • Affects cosmological parameters
Credit: Filippenko et al. 1992 7 Which supernovae have light echoes?
• Generally found around core-collapse supernovae • Light echoes do occur around SNe Ia, but are rare • Why does this matter? • Properties of SNe Ia are related to their environment • Affects cosmological parameters • Hints at progenitors
Credit: Filippenko et al. 1992 7 SN 2009ig Observations & Results SN 2009ig Properties
• Located in NGC 1015 • Redshift of 0.0088 SN2009ig • Peak magnitude V=13.5 • Practically no host galaxy extinction
(AV = 0.01 ± 0.01)
NGC 1015 2010/10/01 - LBC
Information Credit: Foley et al. 2012 8 Late-time Photometry
SN 2009ig
Foley et al. 2012 14 KPNO LBTO
16
18
20 B Magnitude B 22
24
26 55000 55500 56000 56500 57000 57500 58000 58500 MJD 9 Potential geometry?
Credit: S. Heinz et al. 10 What’s Next? • Resolved in archival Hubble data? • What is the actual geometry? • Proposal to obtain more Hubble data
Future Work
Credit: ESA/Hubble & NASA, A. Riess 11 • What is the actual geometry? • Proposal to obtain more Hubble data
Future Work
• Resolved in archival Hubble data?
Credit: ESA/Hubble & NASA, A. Riess 11 • Proposal to obtain more Hubble data
Future Work
• Resolved in archival Hubble data? • What is the actual geometry?
Credit: ESA/Hubble & NASA, A. Riess 11 Future Work
• Resolved in archival Hubble data? • What is the actual geometry? • Proposal to obtain more Hubble data
Credit: ESA/Hubble & NASA, A. Riess 11 Questions?
SN 2009ig
Foley et al. 2012 14 KPNO LBTO
16
18
20 B Magnitude B 22
24
26 55000 55500 56000 56500 57000 57500 58000 58500 MJD 12