2019ApJ...870L...1D

Query : 2019ApJ...870L...1D

2019ApJ...870L...1D - Astrophys. J., 870, L1-L1 (2019/January-1)

K2 observations of SN 2018oh reveal a two-component rising light curve for a Type Ia supernova.

DIMITRIADIS G., FOLEY R.J., REST A., KASEN D., PIRO A.L., POLIN A., JONES D.O., VILLAR A., NARAYAN G., COULTER D.A., KILPATRICK C.D., PAN Y.-C., ROJAS-BRAVO C., FOX O.D., JHA S.W., NUGENT P.E., RIESS A.G., SCOLNIC D., DROUT M.R. (The K2 Mission Team), BARENTSEN G., DOTSON J., GULLY-SANTIAGO M., HEDGES C., CODY A.M., BARCLAY T., HOWELL S. (The KEGS), GARNAVICH P., TUCKER B.E., SHAYA E., MUSHOTZKY R., OLLING R.P., MARGHEIM S., ZENTENO A. (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., ELSAESSER B. (The Pan-STARRS), 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., SMARTT S.J., SMITH K.W. (The DECam), POINTS S., STRAMPELLI G.M. (The ASAS-SN), BRIMACOMBE J., CHEN P., MUNOZ J.A., MUTEL R.L., SHIELDS J., VALLELY P.J., VILLANUEVA S., LI W., WANG X., ZHANG J., LIN H., MO J., ZHAO X., SAI H., ZHANG X., ZHANG K., ZHANG T., WANG L., ZHANG J., BARON E., DERKACY J.M., LI L., CHEN Z., XIANG D., RUI L., WANG L., HUANG F., LI X. (The Las Cumbres Observatory), HOSSEINZADEH G., HOWELL D.A., ARCAVI I., HIRAMATSU D., BURKE J., VALENTI S. (The ATLAS), TONRY J.L., DENNEAU L., HEINZE A.N., WEILAND H., STALDER B. (The Konkoly), VINKO J., SARNECZKY K., PAL A., 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 ePESSTO), WILLIAMS S.C., NORDIN J., CARTIER R., FROHMAIER C., GALBANY L., GUTIERREZ C.P., HOOK I., INSERRA C., SMITH M. (The University of Arizona), SAND D.J., ANDREWS J.E., SMITH N. and BILINSKI C.

Abstract (from CDS):

We present an exquisite 30 minute cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering the moment of explosion and the subsequent rise, and continuing past peak brightness. These data are supplemented by multi-color Panoramic Survey Telescope (Pan-STARRS1) and Rapid Response System 1 and Cerro Tololo Inter-American Observatory 4 m Dark Energy Camera (CTIO 4-m DECam) observations obtained within hours of explosion. The K2 light curve has an unusual two-component shape, where the flux rises with a steep linear gradient for the first few days, followed by a quadratic rise as seen for typical supernovae (SNe) Ia. This "flux excess" relative to canonical SN Ia behavior is confirmed in our i-band light curve, and furthermore, SN 2018oh is especially blue during the early epochs. The flux excess peaks 2.14 ± 0.04 days after explosion, has a FWHM of 3.12 ± 0.04 days, a blackbody temperature of T=17,500–9,000+11,500 K, a peak luminosity of 4.3±0.2×1037ergs–1, and a total integrated energy of 1.27±0.01×1043erg. We compare SN 2018oh to several models that may provide additional heating at early times, including collision with a companion and a shallow concentration of radioactive nickel. While all of these models generally reproduce the early K2 light curve shape, we slightly favor a companion interaction, at a distance of ∼2×1012cm based on our early color measurements, although the exact distance depends on the uncertain viewing angle. Additional confirmation of a companion interaction in future modeling and observations of SN 2018oh would provide strong support for a single-degenerate progenitor system.

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

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

VizieR on-line data: <Available at CDS (J/ApJ/870/L1): table2.dat>

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 2009ig SN* 02 38 11.62 -01 18 45.3           SNIa-norm 168 1
2 SN 2012fr SN* 03 33 35.99 -36 07 37.7           SNIa-norm 178 1
3 Z 90-74 GiG 09 06 39.54126 +19 20 10.4907   15.0       ~ 38 0
4 SN 2018oh SN* 09 06 39.6 +19 20 18           SNIa-norm 91 0
5 SN 2012cg SN* 12 27 12.83 +09 25 13.2           SNIa-norm 224 1
6 ASASSN -14lp SN* 12 45 09.1 -00 27 32           SNIa-norm 75 0
7 ASASSN -14bd SN* 12 52 44.8 +26 28 13           SNIa 102 0
8 SN 2016bln SN* 13 34 45.6 +13 51 14           SNIa-norm 62 0
9 SN 2011fe SN* 14 03 05.711 +54 16 25.22   10.12 10.06     SNIa-norm 747 1
10 SN 2017cbv SN* 14 32 34.420 -44 08 02.74           SNIa 146 0
11 NAME Kepler's SN SNR 17 30 40.51 -21 29 14.4           ~ 851 3
12 KSN 2011b SN* 19 20 37.540 +38 15 08.34           SNIa 14 0
13 KSN 2011c SN* 19 24 46.089 +43 40 50.68           SNIa 8 0
14 KSN 2012a SN* 19 33 30.1 +45 15 01           SNIa 12 0

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