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2019ApJ...870...12L - Astrophys. J., 870, 12-12 (2019/January-1)

Photometric and spectroscopic properties of Type Ia supernova 2018oh with early excess emission from the Kepler 2 observations.

LI W., WANG X., VINKO J., MO J., HOSSEINZADEH G., SAND D.J., ZHANG J., LIN H., ZHANG T., WANG L., ZHANG J., CHEN Z., XIANG D., RUI L., HUANG F., LI X., ZHANG X., LI L., BARON E., DERKACY J.M., ZHAO X., SAI H., ZHANG K., WANG L. (The LCO), HOWELL D.A., McCULLY C., ARCAVI I., VALENTI S., HIRAMATSU D., BURKE J. (The KEGS), REST A., GARNAVICH P., TUCKER B.E., NARAYAN G., SHAYA E., MARGHEIM S., ZENTENO A., VILLAR A. (The UCSC), DIMITRIADIS G., FOLEY R.J., PAN Y.-C., COULTER D.A., FOX O.D., JHA S.W., JONES D.O., KASEN D.N., KILPATRICK C.D., PIRO A.L., RIESS A.G., ROJAS-BRAVO C. (The ASAS-SN), SHAPPEE B.J., HOLOIEN T.W.-S., STANEK K.Z., DROUT M.R., AUCHETTL K., KOCHANEK C.S., BROWN J.S., BOSE S., BERSIER D., BRIMACOMBE J., CHEN P., DONG S., HOLMBO S., MUNOZ J.A., MUTEL R.L., POST R.S., PRIETO J.L., SHIELDS J., TALLON D., THOMPSON T.A., VALLELY P.J., VILLANUEVA S. (The Pan-STARRS), SMARTT S.J., SMITH K.W., CHAMBERS K.C., FLEWELLING H.A., HUBER M.E., MAGNIER E.A., WATERS C.Z., SCHULTZ A.S.B., BULGER J., LOWE T.B., WILLMAN M., SARNECZKY K., PAL A., WHEELER J.C., BODI A., BOGNAR Z., CSAK B., CSEH B., CSORNYEI G., HANYECZ O., IGNACZ B., KALUP C., KONYVES-TOTH R., KRISKOVICS L., ORDASI A., RAJMON I., SODOR A., SZABO R., SZAKATS R., ZSIDI G. (The University of Arizona), MILNE P., ANDREWS J.E., SMITH N., BILINSKI C. (The Swift), BROWN P.J. (The ePESSTO), NORDIN J., WILLIAMS S.C., GALBANY L., PALMERIO J., HOOK I.M., INSERRA C., MAGUIRE K., CARTIER R., RAZZA A., GUTIERREZ C.P. (The University of North Carolina), HERMES J.J., REDING J.S., KAISER B.C. (The ATLAS), TONRY J.L., HEINZE A.N., DENNEAU L., WEILAND H., STALDER B. (The K2 Mission Team), BARENTSEN G., DOTSON J., BARCLAY T., GULLY-SANTIAGO M., HEDGES C., CODY A.M., HOWELL S. (The Kepler Spacecraft Team), COUGHLIN J., VAN CLEVE J.E., VINICIUS DE MIRANDA CARDOSO J., LARSON K.A., McCALMONT-EVERTON K.M., PETERSON C.A., ROSS S.E., REEDY L.H., OSBORNE D., McGINN C., KOHNERT L., MIGLIORINI L., WHEATON A., SPENCER B., LABONDE C., CASTILLO G., BEERMAN G., STEWARD K., HANLEY M., LARSEN R., GANGOPADHYAY R., KLOETZEL R., WESCHLER T., NYSTROM V., MOFFATT J., REDICK M., GRIEST K., PACKARD M., MUSZYNSKI M., KAMPMEIER J., BJELLA R., FLYNN S. and ELSAESSER B.

Abstract (from CDS):

Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically confirmed Type Ia supernova (SN Ia) observed in the Kepler field. The Kepler data revealed an excess emission in its early light curve, allowing us to place interesting constraints on its progenitor system. Here we present extensive optical, ultraviolet, and near-infrared photometry, as well as dense sampling of optical spectra, for this object. SN 2018oh is relatively normal in its photometric evolution, with a rise time of 18.3 ± 0.3 days and Δm15(B) = 0.96 ± 0.03 mag, but it seems to have bluer B - V colors. We construct the "UVOIR" bolometric light curve having a peak luminosity of 1.49 x 1043 erg s–1, from which we derive a nickel mass as 0.55 ± 0.04 M☉ by fitting radiation diffusion models powered by centrally located 56Ni. Note that the moment when nickel-powered luminosity starts to emerge is +3.85 days after the first light in the Kepler data, suggesting other origins of the early-time emission, e.g., mixing of 56Ni to outer layers of the ejecta or interaction between the ejecta and nearby circumstellar material or a nondegenerate companion star. The spectral evolution of SN 2018oh is similar to that of a normal SN Ia but is characterized by prominent and persistent carbon absorption features. The C II features can be detected from the early phases to about 3 weeks after the maximum light, representing the latest detection of carbon ever recorded in an SN Ia. This indicates that a considerable amount of unburned carbon exists in the ejecta of SN 2018oh and may mix into deeper layers.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): supernovae: general - supernovae: individual: SN 2018oh

Nomenclature: Table 1: [LWV2019] Field 1 NN (Nos 1-39). Table 2: [LWV2019] Field 2 NN (Nos 1-14).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 19

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