The Delay Time Distribution of Type Ia Supernovae: Constraints on Progenitors
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The Delay Time Distribution of Type Ia Supernovae: Constraints on Progenitors Chris Pritchet (U. Victoria), Mark Sullivan (Oxford), Damien LeBorgne (IAP), Matt Taylor (PUC Chile), + SNLS Collaboration. SNe Ia CC SNe. or. Mt Wash Feb 2009. SNe Ia.

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The Delay Time Distribution of Type Ia Supernovae: Constraints on Progenitors

Chris Pritchet (U. Victoria), Mark Sullivan (Oxford), Damien LeBorgne (IAP), Matt Taylor (PUC Chile),

+ SNLS Collaboration


SNe Ia CC SNe Constraints on Progenitors

or

UWO Sep 2009

Mt Wash Feb 2009


SNe Ia Constraints on Progenitors

progenitor mechanism –

2 broad classes

or

energy release COFe

no H in spectrum

light curve shape

presence in old stellar pops

UWO Sep 2009

Mt Wash Feb 2009


Sn ia progenitors 2 broad classes

Single Degenerate Constraints on Progenitors - white dwarf + 2ndary evol. (M ~ 1.4 Msun at explosion)

SN Ia Progenitors - 2 Broad Classes

Double Degenerate - 2 white dwarfs (Mtot >= 1.4 Msun at explosion)

Key point: white dwarf maximum mass M = 1.4 Msun (Chandrasekhar mass)


SNe Ia Constraints on Progenitors

progenitor mechanism –

2 broad classes

or

energy release COFe

no H in spectrum

light curve shape

presence in old stellar pops

UWO Sep 2009

Mt Wash Feb 2009


Type ia sne as standard candles
Type Ia SNe as Standard Candles Constraints on Progenitors

  • Bright - seen to cosmological distances

  • Max brightness makes an excellent standard candle - ±6% distance errors

  • Standard candle seems to have a physical basis

    • SNeIa are “well-understood” - thermonuclear disruptions of C+O white dwarfs - std physics

  • Systematics – possibly, but ample opportunity to study with potentially hundreds of objects

  • But …

    • explanation of stretch – L relation

    • explanation of colour – L relation

    • nature of scatter in L after calibration

    • nature of progenitor


    Delay time distribution
    Delay time distribution Constraints on Progenitors

    • DTD(t) = rate of supernovae as a function of time from a burst of star formation

    • SNR(t) = SFR(t) ★ DTD(t)

    DTD(t)

    SNe/yr/1010 M

    SFR(t)

    log t


    Importance of dtd t
    Importance of DTD(t) Constraints on Progenitors

    • potential to discriminate among progenitor models

    Greggio 2005


    Dtd history
    DTD History Constraints on Progenitors

    • pre-1990 – “prevailing wisdom” was that all SN Ia were old because they occur in E/S0 galaxies

    • by 2004 – SNe Ia have higher rates in young galaxies – both young and old progenitors


    Recent dtd determinations
    Recent DTD Determinations Constraints on Progenitors

    • from age/SFH estimates of SN host and field galaxies (SN age ~ galaxy age)

    Totani et al 2008:

    Subaru/XMM survey

    65 variable objects

    ages from SED fitting


    Recent dtd determinations1
    Recent DTD Determinations Constraints on Progenitors

    • from age/SFH estimates of SN host and field galaxies

    Maoz et al 2010:

    LOSS survey

    82 SNeIa

    SFH from SDSS

    Maoz


    Supernova legacy survey snls
    Supernova Legacy Survey (SNLS) Constraints on Progenitors

    • 2003-2008, 4 deg2, ugriz, 4d samples, CFHT 3.6m+MegaCam

    • spec types and z (VLT, Gemini, Keck) - 370 SNeIa (0.2<z<1)


    Dtd from snls
    DTD from SNLS Constraints on Progenitors

    • completeness estimate and weight for each supernova

    • host galaxy age for each supernova …

      • assumes host age = SN progenitor age

  • … and an age for all other objects too

    • gives total available mass at a given age


  • Z distribution and completeness
    z distribution and completeness Constraints on Progenitors

    SNIa*

    SNIa

    • Perrett et al 2011


    Sn weighting
    SN weighting Constraints on Progenitors

    SNe / year

    (all fields,

    rest-frame)

    Perrett et al 2011

    # of observing

    seasons

    length of each

    observing season


    Pegase zpeg ages and redshifts
    Pegase/zpeg ages and redshifts Constraints on Progenitors

    • mass, SFR, age, z for different evol scenarios


    Dtd calculation
    DTD Calculation Constraints on Progenitors

    • Use only SNe with hosts in magnitude-limited catalogue

      • assumes that SN DTD does not depend on host galaxy mass

  • In each time bin of DTD t1t2, sum wi values for SNe with t1<ti<t2; normalize by host mass in time bin:


  • 2 different m t methods
    2 different M(t) methods Constraints on Progenitors

    • 0.2 < z < 0.75, 4 SNLS fields (3.6 deg2)

    • dashed=SFR(z), solid=zpeg SED fits

    SFR(z)

    log M

    log M(t)

    Hopkins and Beacom 2006

    log t


    DTD Constraints on Progenitors

    • other z ranges give the same result


    Dtd from 2 different m t methods
    DTD from 2 different M(t) methods Constraints on Progenitors

    • 0.2 < z < 0.75, red=SFR(z), black=obs


    Comparison with totani et al 2008
    Comparison with Totani et al 2008 Constraints on Progenitors

    t-1

    Totani

    Mannucci


    Power law fit
    Power-law fit Constraints on Progenitors

    t-1.35


    Two power laws
    Two power laws Constraints on Progenitors

    t-0.7

    t-3

    cutoff real


    Comparison with dd
    Comparison with DD Constraints on Progenitors

    solid – Mennekens et al 2010

    dotted – Ruiter et al 2009

    dashed – Yungelson and Livio 2000


    Comparison with sd
    Comparison with SD Constraints on Progenitors

    solid – Mennekens et al 2010

    dotted – Ruiter et al 2009

    dashed – Hachisu et al 1999

    dash dot – Han and Podsiadlowski 2004


    Further corrections
    Further corrections Constraints on Progenitors

    • Have assumed that TSN=<Thost>. Not necessarily true

      • iterative approach to correct statistically

  • correction for dead stars

    • slope steeper by ~0.1

  • effects of bursts

  • effects of catastrophic errors in M or age


  • Supernova light curve stretch s
    Supernova light curve stretch s Constraints on Progenitors

    Making a standard candle

    aka Phillips relation


    Stretch dependence of dtd
    Stretch dependence of DTD Constraints on Progenitors

    • not due to age systematics

    • two types of progenitors?? or …


    Conclusions
    Conclusions Constraints on Progenitors

    • SNIa DTD may be more complex than a simple ~ 1/t power-law

    • match to DD population synthesis models

      • pop syn needs further work

  • s<1 and >1 show differences in DTD below 109 yr – different progenitors? or PDF of ages?


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