Tests of the Accelerating Universe with Near‐Infrared Observations of a High‐Redshift Type Ia Supernova

Adam G. Riess; Alexei V Filippenko; Michael C. Liu; Peter Challis; A. Clocchiatti; Alan H. Diercks; P. Garnavich; Craig J. Hogan; Saurabh W. Jha; R. Kirshner; B. Leibundgut; M. M. Phillips; David J. Reiss; B. Schmidt; R. A. Schommer; R. Chris Smith; J. Spyromilio; C. W. Stubbs; N. B. Suntzeff; J. Tonry; P. A. Woudt; Róbert Brunner; Arjun Dey; R. R. Gal; James Graham; James Larkin; Steve Odewahn; Rebecca Oppenheimer

doi:10.1086/308939

Abstract

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We have measured the rest-frame B,V, and I-band light curves of a\nhigh-redshift type Ia supernova (SN Ia), SN 1999Q (z=0.46), using HST and\nground-based near-infrared detectors.\n A goal of this study is the measurement of the color excess, E_{B-I}, which\nis a sensitive indicator of interstellar or intergalactic dust which could\naffect recent cosmological measurements from high-redshift SNe Ia. Our\nobservations disfavor a 30% opacity of SN Ia visual light by dust as an\nalternative to an accelerating Universe. This statement applies to both\nGalactic-type dust\n (rejected at the 3.4 sigma confidence level) and greyer dust (grain size >\n0.1 microns; rejected at the 2.3 to 2.6 sigma confidence level) as proposed by\nAguirre (1999). The rest-frame $I$-band light cur ve shows the secondary\nmaximum a month after B maximum typical of nearby SNe Ia of normal luminosi ty,\nproviding no indication of evolution as a function of redshift out to z~0.5. A\nn expanded set of similar observations could improve the constraints on any\ncontribution of extragalactic dust to the dimming of high-redshift SNe Ia.\n

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