Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light Curve
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Shappee, B. J.
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Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light Curve
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© 2018. The American Astronomical Society. All rights reserved..On 2018 February 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in the K2 Campaign 16 field. With a redshift of z = 0.01098 and a peak apparent magnitude of B max = 14.31, ASASSN-18bt is the nearest and brightest SNe Ia yet observed by the Kepler spacecraft. Here we present the discovery of ASASSN-18bt, the K2 light curve, and prediscovery data from ASAS-SN and the Asteroid Terrestrial-impact Last Alert System. The K2 early-time light curve has an unprecedented 30-minute cadence and photometric precision for an SN Ia light curve, and it unambiguously shows a ∼4 day nearly linear phase followed by a steeper rise. Thus, ASASSN-18bt joins a growing list of SNe Ia whose early light curves are not well described by a single power law. We show that a double-power-law model fits the data reasonably well, hinting that two physical processes must be responsible for the observed rise. However, we
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URI: https://repositorio.uchile.cl/handle/2250/171464
DOI: 10.3847/1538-4357/aaec79
ISSN: 15384357
0004637X
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Astrophysical Journal, Volumen 870, Issue 1, 2019,
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