New Views of Stellar Explosions: The Supernova Spectropolarimetry Project
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1 New Views of Stellar Explosions: The Supernova Spectropolarimetry Project Jennifer L. Hoffman University of Denver G. Grant Williams (MMTO) Paul Smith (Steward Obs.) Nathan Smith (Steward Obs.) Chris Bilinski (Steward Obs.) Peter Milne (Steward Obs.) Leah Huk (DU) Douglas Leonard (SDSU) Luc Dessart (Lagrange, CNRS) NSF AST SN 1994D
2 Outline Overview of supernova polarization The SNSPOL project Recent observational results SN 2011fe (Ia) SN 2012au (Ib) SN 2010jl (IIn) Future prospects NGC 2770
3 Overview Supernova polarization is big news!
4 Overview Why do we care about supernova polarization? Polarization results from asphericity, so It yields insight into collapse/explosion mechanisms. It tells us about the stellar winds and circumstellar material of progenitor stars. It helps us probe stellar evolution in faraway galaxies. It has potential implications for the use of some supernovae as cosmological probes. SN 2008aq
5 Overview All types of supernovae can be polarized! < 10 M
6 Overview Broadband polarization measurements indicate ejecta asphericity. SN 2004dj (II P) Leonard et al Leonard et al Continuum polarisation (%P) Dessart & Hillier 2011
7 Overview Polarization across spectral lines probes distribution of elements in the ejecta and surroundings. Q U SN 2001el (Ia) Kasen et al. 2003
8 Overview New frontier: time domain spectropolarimetry! SN 2002ap (Ic) SN 2001ig (IIb) ay 13 Day 13 Day 31 Kawabata et al Maund et al. 2007
9 Overview New frontier: time domain spectropolarimetry! SN 1997eg (IIn) Hoffman et al. 2008
10 The SNSPOL project 61 Kuiper, Mt. Bigelow SPOL 2.3 m Bok, Kitt Peak 6.5 m MMT, Mt. Hopkins (with DU grad student Leah Huk)
11 The SNSPOL project plus supporting observations from HPOL, 1 m telescope Ritter Observatory (ISP measurements; with Toledo postdoc Jimmy Davidson) SPOL CCD447 camera, 40 telescope Mt. Laguna Observatory (photometric monitoring; with SDSU grad students Harish Khandrika and Alisa Rachubo)
12 The SNPOL project plus theoretical modeling. SPOL with DU grad student Manisha Shrestha (talk this session) Hoffman et al. 2008, 2009 Dessart & Hillier 2011
13 The SNSPOL project 27 supernovae of all types observed so far, most at multiple epochs. Ia SN 2011 fe (8) SN 2012cg (2) SN 2012ht (2) Ib SN 2012 au (6) IIb SN 2011dh (2) SN 2012fg (2) SN 2013ak (3) SN 2013df (1) II P SN 2012A (5) SN 2012aw (7) SN 2012ch (1) SH 2012ec (6) SH 2012ho (1) SN 2013ab (5) SN 2013bi (3) IIn SN 2012jl (11) SN 2011cc (1) SN 2011ht (2) PTF11iqb (1) SN 2009ip (4) Ic PTF12gzk (2) SN 2012ej (4) SN 2012fh (3) II SN 2011bv (1) SN 2013am (4) SN 2013bu (3)
14 SN 2011fe (Ia) Dramatic changes across Si II line suggest clumpy ejecta or changes in illumination.
15 SN 2012au (Ib) Flux He I 5876 shows strong, timevariable polarization, supporting previous hypotheses of an asymmetric explosion. %P Flux ( )
16 SN 2010jl (IIn) H He I H, He lines show different polarization behavior, allowing us to probe ejecta and CSM composition.
17 SN 2010jl (IIn) %Q %U H, He lines show different polarization behavior, allowing us to probe ejecta and CSM composition.
18 Future prospects Where are we now? Community has realized the importance of spectropolarimetry in SN studies. SNSPOL is building a large database of these observations over time. SNSPOL data are yielding insights into the time variable asymmetries of explosions, ejecta composition, and CSM. Photometric monitoring and ISP measurements give a complete picture of each SN observed. SN 2002bo, Benetti et al. 2004
19 Future prospects What s next? Ongoing observations better statistics: more SNe in each class, greater wavelength and time coverage Modeling of individual objects and object classes Classification: polarimetry can help illuminate relationships between classes Late stellar evolution: polarimetry can help identify, study SN progenitors SN 2004dj
20 New Views of Stellar Explosions: The Supernova Spectropolarimetry Project Jennifer L. Hoffman University of Denver G. Grant Williams (MMTO) Paul Smith (Steward Obs.) Nathan Smith (Steward Obs.) Chris Bilinski (Steward Obs.) Peter Milne (Steward Obs.) Leah Huk (DU) Douglas Leonard (SDSU) Luc Dessart (Lab. Lagrange) NSF AST SN 1994D
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