The Slowly Fading Echo Around Type Ia 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