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A luminous, blue progenitor system for the type Iax supernova 2012Z - Nature

  • ️Stritzinger, Maximilian D.
  • ️Wed Aug 06 2014

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Acknowledgements

We dedicate this paper to the memory of our friend and colleague Weidong Li, whose work on the Lick Observatory Supernova Search, SN 2002cx-like supernovae, and Hubble Space Telescope observations of supernova progenitors continues to inspire us. We thank the SH0ES team for assistance with data from HST programme GO-12880, E. Bertin for the development of the STIFF software to produce colour images, and A. Dolphin for software and guidance in photometry. This research at Rutgers University was supported through NASA/HST grant GO-12913.01 and National Science Foundation (NSF) CAREER award AST-0847157 to S.W.J.; NASA/HST grant GO-12999.01 to R.J.F. supported this work at the University of Illinois. At UC Santa Barbara, this work was supported by NSF grants PHY 11-25915 and AST 11-09174 to L.B. The Danish Agency for Science, Technology, and Innovation supported M.D.S. through a Sapere Aude Level 2 grant. Support for HST programmes GO-12913 and GO-12999 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

Author information

Authors and Affiliations

  1. Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA,

    Curtis McCully & Saurabh W. Jha

  2. Astronomy Department, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, Illinois 61801, USA,

    Ryan J. Foley

  3. Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA,

    Ryan J. Foley

  4. Department of Physics, University of California, Santa Barbara, 93106, California, USA

    Lars Bildsten

  5. Kavli Institute for Theoretical Physics, University of California, Santa Barbara, 93106, California, USA

    Lars Bildsten

  6. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, 02138, Massachusetts, USA

    Wen-fai Fong, Robert P. Kirshner & G. H. Marion

  7. Department of Astronomy, University of Texas at Austin, Austin, 78712, Texas, USA

    G. H. Marion

  8. Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA,

    Adam G. Riess

  9. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, 21218, Maryland, USA

    Adam G. Riess

  10. Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark,

    Maximilian D. Stritzinger

Authors

  1. Curtis McCully

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  2. Saurabh W. Jha

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  3. Ryan J. Foley

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  4. Lars Bildsten

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  5. Wen-fai Fong

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  6. Robert P. Kirshner

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  7. G. H. Marion

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  8. Adam G. Riess

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  9. Maximilian D. Stritzinger

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Contributions

C.M., S.W.J. and R.J.F. performed the data analysis and were chiefly responsible for preparing the manuscript and figures. W.F., R.P.K., G.H.M. and A.G.R. assisted in developing the proposal to obtain HST observations, including acquiring supporting ground-based photometry and spectroscopy. L.B. provided insight into models for progenitor systems. M.D.S. analysed ground-based photometry and spectroscopy of the supernova, used as input for this paper. All authors contributed to extensive discussions about, and edits to, the paper draft.

Corresponding author

Correspondence to Saurabh W. Jha.

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Competing interests

The authors declare no competing financial interests.

Extended data figures and tables

Extended Data Figure 1 Spectra of type Iax supernovae near maximum light.

SN 2012Z1 is similar to SN 2005hk4 and SN 2008A6, all classified as type Iax supernovae. The SN 2012Z spectrum was taken on 2012 February 16 ut with the Whipple Observatory 1.5 m telescope (+FAST spectrograph) with a total exposure time of 1,800 s. Each flux density (Fλ) spectrum is labelled by its rest-frame phase past maximum light in B band. Prominent features due to intermediate-mass and iron-group elements are indicated; these features are also observed in luminous, slowly declining type Ia supernova spectra at maximum light, though with higher expansion velocities.

Source data

Extended Data Figure 2 Chance alignment probability calculation.

a, Chance alignment probability between a random position and a detected source within a square box of the given width (top axis, in arcsec; bottom axis, in pixels) centred at the position of SN 2012Z. This calculation is based on a 1σ position coincidence (0.0103″ = 0.2575 WFC3/UVIS pixels); a 3σ position coincidence gives probabilities approximately 9 times higher. The offset between SN 2012Z and S1 is 0.8σ. The shaded regions show a naive Poisson-like uncertainty estimate with a fractional error given by . b, Number of detected sources (including S1) as a function of the box size. The lines show results for all stellar sources (>3σ detection in any band; blue) and just those as bright as S1 (red).

Source data

Extended Data Figure 3 Stars in the neighbourhood of the SN 2012Z progenitor.

The SN 2012Z progenitor system S1 (blue) is shown along with nearby stars (all with 1σ photometric uncertainties), with three isochrones24 with ages of 10.5 (dotted), 17.0 (dashed), and 41.7 Myr (solid). a, The F435W − F555W colour (roughly B − V), b, the F555W − F814W colour (roughly V − I), both plotted against the F555W (roughly V) absolute magnitude. The large, filled circles correspond to stars within 10 WFC3/UVIS pixels (0.4″) of the supernova location, small filled circles are within 20 pixels (0.8″), and the small open circles are within 30 pixels (1.2″). Objects in the grey shaded regions would not be detected given the depth of the combined images.

Source data

Extended Data Table 1 Pre-explosion photometry of SN 2012Z progenitor system S1 and nearby stars

Full size table

Extended Data Table 2 Photometric variability of the SN 2012Z progenitor system S1

Full size table

Supplementary information

PowerPoint slides

Source data

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McCully, C., Jha, S., Foley, R. et al. A luminous, blue progenitor system for the type Iax supernova 2012Z. Nature 512, 54–56 (2014). https://doi.org/10.1038/nature13615

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  • Received: 25 February 2014

  • Accepted: 19 June 2014

  • Published: 06 August 2014

  • Issue Date: 07 August 2014

  • DOI: https://doi.org/10.1038/nature13615