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Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope | | Xiaofeng Wang
; Lifan Wang
; Alexei V. Filippenko
; Greg Aldering
; Pierre Antilogus
; David Arnett
; Dietrich Baade
; Eddie Baron
; Brian J. Barris
; Stefano Benetti
; Patrice Bouchet
; Adam S. Burrows
; Ramon Canal
; Enrico Cappellaro
; Raymond Carlberg
; Elisa di Carlo
; Peter Challis
; Arlin Crotts
; John I. Danziger
; Massimo Della Valle
; Dennis Jack
; Michael Fink
; Ryan J. Foley
; Claes Fransson
; Avishay Gal-Yam
; Peter Garnavich
; Chris L. Gerardy
; Mario Hamuy
; Wolfgang Hillebrandt
; Peter A. Hoeflich
; Stephen T. Holland
; Daniel E. Holz
; John P. Hughes
; David J. Jeffrey
; Saurabh W. Jha
; Dan Kasen
; Alexei M. Khokhlov
; Robert P. Kirshner
; Robert Knop
; Cecilia Kozma
; Kevin Krisciunas
; Markus Kromer
; 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 Mazzali
; Peter Meikle
; Gajus Miknaitis
; Peter Milne
; Stefan Mochnacki
; Ken'Ichi Nomoto
; Peter E. Pugent
; Elaine Oran
; Nino Panagia
; Ferdinando Patat
; Saul Perlmutter
; Mark M. Phillips
; Philip Pinto
; Dovi Poznanski
; Christopher J. Pritchet
; Martin Reinecke
; Adam Riess
; Pilar Ruiz-Lapuente
; Richard Scalzo
; Eric M. Schlegel
; Brian Schmidt
; James Siegrist
; Alicia M. Soderberg
; Jesper Sollerman
; George Sonneborn
; Jason Spyromilio
; Richard A. Sramek
; Sumner G. Starrfield
; Louis G. Strolger
; Nicholas B. Suntzeff
; Rollin Thomas
; John L. Tonry
; Amedeo Tornambe
; James W. Truran
; Massimo Turatto
; Michael Turner
; Schuyler D. Van Dyk
; Kurt Weiler
; J. Craig Wheeler
; Michael Wood-Vasey
; Stan Woosley
; Hitoshi Yamaoka
; Tianmeng Zhang
; | | Date: |
26 Oct 2011 | | 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 dataset
provides unique spectral time series down to 2000 Angstrom. Significant
diversity is seen in the near maximum-light spectra (~ 2000--3500 Angstrom) 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 uvw1/F250W are found to correlate
with the B-band light-curve shape parameter dm15(B), but with much larger
scatter relative to the correlation in the broad-band B band (e.g., ~ 0.4 mag
versus ~0.2 mag for those with 0.8 < dm15 < 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 ~0.9 mag and ~2.0 mag 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. | | Source: | arXiv, 1110.5809 | | Services: | Forum | Review | PDF | Favorites | |
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