Evidence for type Ia supernova diversity from ultraviolet observations with the hubble space telescope

Xiaofeng Wang*, Lifan Wang, Alexei V. Filippenko, Eddie Baron, Markus Kromer, Dennis Jack, Tianmeng Zhang, Greg Aldering, Pierre Antilogus, W. David Arnett, Dietrich Baade, Brian J. Barris, Stefano Benetti, Patrice Bouchet, Adam S. Burrows, Ramon Canal, Enrico Cappellaro, Raymond G. Carlberg, Elisa Di Carlo, Peter J. ChallisArlin P.S. Crotts, John I. Danziger, Massimo Della Valle, Michael Fink, Ryan J. Foley, Claes Fransson, Avishay Gal-Yam, Peter M. Garnavich, Chris L. Gerardy, Gerson Goldhaber, Mario Hamuy, Wolfgang Hillebrandt, Peter Höflich, Stephen T. Holland, Daniel E. Holz, John P. Hughes, David J. Jeffery, Saurabh W. Jha, Dan Kasen, Alexei M. Khokhlov, Robert P. Kirshner, Robert A. Knop, Cecilia Kozma, Kevin Krisciunas, Brian C. Lee, Bruno Leibundgut, Eric J. Lentz, Douglas C. Leonard, Walter H.G. Lewin, Weidong Li, Mario Livio, Peter Lundqvist, Dan Maoz, Thomas Matheson, Paolo A. Mazzali, Peter Meikle, Gajus Miknaitis, Peter A. Milne, Stefan W. Mochnacki, Ken'Ichi Nomoto, Peter E. Nugent, Elaine S. Oran, Nino Panagia, Saul Perlmutter, Mark M. Phillips, Philip Pinto, Dovi Poznanski, Christopher J. Pritchet, Martin Reinecke, Adam G. Riess, Pilar Ruiz-Lapuente, Richard A. Scalzo, Eric M. Schlegel, Brian P. Schmidt, James Siegrist, Alicia M. Soderberg, Jesper Sollerman, George Sonneborn, Anthony Spadafora, Jason Spyromilio, Richard A. Sramek, Sumner G. Starrfield, Louis G. Strolger, Nicholas B. Suntzeff, Rollin C. Thomas, John L. Tonry, Amedeo Tornambe, James W. Truran, Massimo Turatto, Michael Turner, Schuyler D. Van Dyk, Kurt W. Weiler, J. Craig Wheeler, Michael Wood-Vasey, Stanford E. Woosley, Hitoshi Yamaoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This data set provides unique spectral time series down to 2000 Å. Significant diversity is seen in the near-maximum-light spectra (2000-3500 Å) for this small sample. The corresponding photometric data, together with archival data from Swift Ultraviolet/Optical Telescope observations, provide further evidence of increased dispersion in the UV emission with respect to the optical. The peak luminosities measured in the uvw1/F250W filter are found to correlate with the B-band light-curve shape parameter Δm 15(B), but with much larger scatter relative to the correlation in the broadband B band (e.g., 0.4mag versus 0.2mag for those with 0.8 mag < Δm 15(B) < 1.7mag). SN2004dt is found as an outlier of this correlation (at > 3σ), being brighter than normal SNe Ia such as SN2005cf by 0.9mag and 2.0mag in the uvw1/F250W and uvm2/F220W filters, respectively. We show that different progenitor metallicity or line-expansion velocities alone cannot explain such a large discrepancy. Viewing-angle effects, such as due to an asymmetric explosion, may have a significant influence on the flux emitted in the UV region. Detailed modeling is needed to disentangle and quantify the above effects.

Original languageEnglish
Article number126
JournalAstrophysical Journal
Volume749
Issue number2
DOIs
StatePublished - 20 Apr 2012

Funding

FundersFunder number
National Science Foundation1107445, 1007977
Directorate for Mathematical and Physical Sciences0708873, 0607485, 0908886, 0707769
Science and Technology Facilities CouncilST/J001465/1

    Keywords

    • cosmology: observations
    • distance scale
    • dust, extinction
    • supernovae: general
    • ultraviolet: general

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