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Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space TelescopeWe 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 dataset provides unique spectral time series down to 2000 A. Significant diversity is seen in the near-maximum-light spectra (approx.2000-3500 A) 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 uvw lIF250W filter are found to correlate with the B-band light-curve shape parameter .(Delta)m15(B), but with much larger scatter relative to the correlation in the broad-band B band (e.g., approx. 0.4 mag versus approx. 0.2 mag for those with 0.8 <.(Delta)m15(B) < 1.7 mag). SN 2004dt is found as an outlier of this correlation (at> 3(sigma), being brighter than normal SNe Ia such as SN 2005cf by approx. 0,9 mag and approx. 2.0 mag in the uvwl1F250W 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
Document ID
20120009064
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Wang, Xiaofeng (Tsinghua Univ. Bejing, China)
Wang, Lifan (Texas A&M Univ. College Station, TX, United States)
Filippenko, Alexei (California Univ. Berkeley, CA, United States)
Baron, Eddie (Oklahoma Univ. Norman, OK, United States)
Kromer, Markus (Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Jack, Dennis (Hamburger Sternwarte G.m.b.H. Germany)
Zhang, Tianmeng (Chinese Academy of Sciences China)
Aldering, Greg (Department of Energy Berkeley, CA, United States)
Antilogus, Pierre (Laboratoire de Physique Nucleaire des Hautes Energies Palaiseau, France)
Arnett, W. David (Arizona Univ. Tucson, AZ, United States)
Baade, Dietrich (European Southern Observatory Munich, Germany)
Barris, Brian J. (Hawaii Univ. Honolulu, HI, United States)
Benetti, Stefano (Osservatorio Astronomico Padova, Italy)
Bouchet, Patrice (Saclay Research Centre Gif-sur-Yvette, France)
Burrows, Adam S. (Princeton Univ. NJ, United States)
Canal, Ramon (Barcelona Univ. Spain)
Cappellaro, Enrico (Osservatorio Astronomico Padova, Italy)
Carlberg, Raymond (Toronto Univ. Ontario, Canada)
di Carlo, Elisa (Osservatorio Astronomico Teramo, Italy)
Challis, Peter (Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Crotts, Arlin (Columbia Univ. New York, NY, United States)
Danziger, John I. (Osservatorio Astronomico Naples, Italy)
Della Valle, Massimo (Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Rome, Italy)
Holland, Stephen T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2012
Subject Category
Astronomy
Report/Patent Number
GSFC.ABS.6149.2012
Funding Number(s)
CONTRACT_GRANT: NSF AST-0607485
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: DE-FG02-08ER41563
CONTRACT_GRANT: NNX06AH85G
CONTRACT_GRANT: NSF AST-0908886
CONTRACT_GRANT: DE-FC02-06ER41453
CONTRACT_GRANT: GO-10877
Distribution Limits
Public
Copyright
Public Use Permitted.

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