FIXING THE U-BAND PHOTOMETRY OF TYPE Ia SUPERNOVAE

Journal Article · Tue Jan 01 04:00:00 EST 2013 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/145/1/11· OSTI ID:22089736

Krisciunas, Kevin; Bastola, Deepak; Suntzeff, Nicholas B. ^[1]; Espinoza, Juan; Gonzalez, David ^[2]; Gonzalez, Luis; Gonzalez, Sergio; Hsiao, Eric Y.; Morrell, Nidia; Phillips, Mark M. ^[3]; Hamuy, Mario ^[4]

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1. Department of Physics and Astronomy, Texas A and M University, 4242 TAMU, College Station, TX 77843-4242 (United States)
2. Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile)
3. Las Campanas Observatory, Casilla 601, La Serena (Chile)
4. Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile)

We present previously unpublished photometry of supernovae 2003gs and 2003hv. Using spectroscopically derived corrections to the U-band photometry, we reconcile U-band light curves made from imagery with the Cerro Tololo 0.9 m, 1.3 m, and Las Campanas 1 m telescopes. Previously, such light curves showed a 0.4 mag spread at one month after maximum light. This gives us hope that a set of corrected ultraviolet light curves of nearby objects can contribute to the full utilization of rest-frame U-band data of supernovae at redshift {approx}0.3-0.8. As pointed out recently by Kessler et al. in the context of the Sloan Digital Sky Survey supernova search, if we take the published U-band photometry of nearby Type Ia supernovae at face value, there is a 0.12 mag U-band anomaly in the distance moduli of higher redshift objects. This anomaly led the Sloan survey to eliminate from their analyses all photometry obtained in the rest-frame U-band. The Supernova Legacy Survey eliminated observer frame U-band photometry, which is to say nearby objects observed in the U-band, but they used photometry of high-redshift objects no matter in which band the photons were emitted.

• OSTI ID: 22089736
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 1 Vol. 145; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTRONOMY
ASTROPHYSICS
CORRECTIONS
COSMIC PHOTONS
DIAGRAMS
DISTANCE
EMISSION SPECTROSCOPY
PHOTOMETRY
RED SHIFT
SUPERNOVAE
TELESCOPES
ULTRAVIOLET RADIATION
VISIBLE RADIATION