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Hubble Space Telescope Studies of Nearby Type Ia Supernovae: The Mean Maximum Light Ultraviolet Spectrum and its Dispersion

Cooke, Jeff and Ellis, Richard S. and Sullivan, Mark and Nugent, Peter and Howell, D. Andrew and Gal-Yam, Avishay and Lidman, Chris and Bloom, Joshua S. and Cenko, S. Bradley and Kasliwal, Mansi M. and Kulkarni, Shrinivas R. and Law, Nicholas M. and Ofek, Eran O. and Quimby, Robert M. (2011) Hubble Space Telescope Studies of Nearby Type Ia Supernovae: The Mean Maximum Light Ultraviolet Spectrum and its Dispersion. Astrophysical Journal Letters, 727 (2). Art. No. L35. ISSN 2041-8205.

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We present the first results of an ongoing campaign using the STIS spectrograph on board the Hubble Space Telescope (HST), whose primary goal is the study of near-ultraviolet (UV) spectra of local Type Ia supernovae (SNe Ia). Using events identified by the Palomar Transient Factory and subsequently verified by ground-based spectroscopy, we demonstrate the ability to locate and classify SNe Ia as early as 16 days prior to maximum light. This enables us to trigger HST in a non-disruptive mode to obtain near UV spectra within a few days of maximum light for comparison with earlier equivalent ground-based spectroscopic campaigns conducted at intermediate-redshifts, ^-_z ≃ 0.5. We analyze the spectra of 12 SNe Ia located in the Hubble flow with 0.01 < z < 0.08. Although a fraction of our eventual sample, these data, together with archival data, already provide a substantial advance over that previously available. Restricting samples to those of similar phase and stretch, the mean UV spectrum agrees reasonably closely with that at intermediate redshift, although some differences are found in the metallic absorption features. A larger sample will determine whether these differences reflect possible biases or are a genuine evolutionary effect. Significantly, the wavelength-dependent dispersion, which is larger in the UV, follows similar trends to those observed at intermediate redshift and is driven, in part, by differences in the various metallic features. While the origin of the UV dispersion remains uncertain, our comparison suggests that it may reflect compositional variations among our sample rather than being predominantly an evolutionary effect.

Item Type:Article
Related URLs:
URLURL TypeDescription
Cooke, Jeff0000-0001-5703-2108
Ellis, Richard S.0000-0001-7782-7071
Sullivan, Mark0000-0001-9053-4820
Nugent, Peter0000-0002-3389-0586
Howell, D. Andrew0000-0003-4253-656X
Gal-Yam, Avishay0000-0002-3653-5598
Lidman, Chris0000-0003-1731-0497
Bloom, Joshua S.0000-0002-7777-216X
Cenko, S. Bradley0000-0003-1673-970X
Kasliwal, Mansi M.0000-0002-5619-4938
Kulkarni, Shrinivas R.0000-0001-5390-8563
Law, Nicholas M.0000-0001-9380-6457
Ofek, Eran O.0000-0002-6786-8774
Quimby, Robert M.0000-0001-9171-5236
Additional Information:© 2011 American Astronomical Society. Received 2010 October 11; accepted 2010 December 6; published 2011 January 10. R.S.E. acknowledges support from DOE grant DESC0001101, M.S. from the Royal Society, A.G. from the Israeli Science Foundation and a European Union Marie Curie fellowship. Support for program GO 11721 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA Contract NAS5-26555. The National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02- 05CH11231, provided staff, computational resources, and data storage for this project. P.E.N. acknowledges support from the US Department of Energy Scientific Discovery through Advanced Computing program under contract DE-FG02-06ER06- 04. S.B.C. acknowledges generous support from Gary and Cynthia Bengier and the Richard and Rhoda Goldman Foundation.
Group:Palomar Transient Factory
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001101
Israel Science FoundationUNSPECIFIED
NASAGO 11721
Department of Energy (DOE)DE-AC02-05CH11231
Department of Energy (DOE)DE-FG02-06ER06-04
Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:cosmological parameters – supernovae: general – ultraviolet: general
Issue or Number:2
Classification Code:PACS: 97.60.Bw, 97.10.Ri, 95.30.Ky
Record Number:CaltechAUTHORS:20110315-085705825
Persistent URL:
Official Citation:Jeff Cooke et al. 2011 ApJ 727 L35 doi: 10.1088/2041-8205/727/2/L35
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22879
Deposited By: Benjamin Perez
Deposited On:15 Mar 2011 16:29
Last Modified:22 Nov 2019 21:42

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