2015ApJ...806..195V


Query : 2015ApJ...806..195V

2015ApJ...806..195V - Astrophys. J., 806, 195 (2015/June-3)

LEGUS discovery of a light echo around supernova 2012aw.

VAN DYK S.D., LEE J.C., ANDERSON J., ANDREWS J.E., CALZETTI D., BRIGHT S.N., UBEDA L., SMITH L.J., SABBI E., GREBEL E.K., HERRERO A. and DE MINK S.E.

Abstract (from CDS):

We have discovered a luminous light echo around the normal Type II-Plateau Supernova (SN) 2012aw in Messier 95 (M95; NGC 3351), detected in images obtained approximately two years after explosion with the Wide Field Channel 3 on board the Hubble Space Telescope by the Legacy ExtraGalactic Ultraviolet Survey. The multi-band observations span from the near-ultraviolet through the optical (F275W, F336W, F438W, F555W, and F814W). The apparent brightness of the echo at the time was ∼21-22 mag in all of these bands. The echo appears circular, although less obviously as a ring, with an inhomogeneous surface brightness, in particular, a prominent enhanced brightness to the southeast. The SN itself was still detectable, particularly in the redder bands. We are able to model the light echo as the time-integrated SN light scattered off of diffuse interstellar dust in the SN environment. We have assumed that this dust is analogous to that in the Milky Way with Rv = 3.1. The SN light curves that we consider also include models of the unobserved early burst of light from the SN shock breakout. Our analysis of the echo suggests that the distance from the SN to the scattering dust elements along the echo is ≈ 45 pc. The implied visual extinction for the echo-producing dust is consistent with estimates made previously from the SN itself. Finally, our estimate of the SN brightness in F814W is fainter than that measured for the red supergiant star at the precise SN location in pre-SN images, possibly indicating that the star has vanished and confirming it as the likely SN progenitor.

Abstract Copyright:

Journal keyword(s): dust, extinction - galaxies: individual: M95 - scattering - supernovae: general - supernovae: individual: SN 2012aw

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1709 1
2 SN 2003gd SN* 01 36 42.65 +15 44 19.9     13.2     SNIIP 246 2
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17261 1
4 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4907 2
5 NGC 2441 GiG 07 51 54.6864254040 +73 00 56.553791256   12.7       ~ 101 0
6 SN 1995E SN* 07 51 56.75 +73 00 34.6   16.81 15.9     SNIa 117 1
7 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1410 1
8 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4419 3
9 SN 2014J SN* 09 55 42.12 +69 40 25.9           SNIa-norm 402 1
10 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5814 6
11 SN 2012aw SN* 10 43 53.735 +11 40 17.63       15   SNIIP 200 1
12 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1108 2
13 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 812 1
14 SN 1998bu SN* 10 46 46.01 +11 50 07.5   12.11       SNIa 315 1
15 SN 2006X SN* 12 22 53.93 +15 48 32.0     15.3     SNIa 322 1
16 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1832 2
17 NGC 4527 GiP 12 34 08.4 +02 39 15   12.4       ~ 530 2
18 SN 1991T SN* 12 34 10.20 +02 39 56.4   11.70 11.51     SNIapec 763 1
19 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3401 0
20 SN 2007af SN* 14 22 21.03 -00 23 37.6     15.4     SNIa 161 1
21 NGC 5584 EmG 14 22 23.811 -00 23 14.82   12.80   12.0 11.8 ~ 263 0
22 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1094 2
23 SN 2008bk SN* 23 57 50.42 -32 33 21.5           SNIIP 138 2
24 NAME Local Group GrG ~ ~           ~ 8310 0

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