2014A&A...562A..17E


Query : 2014A&A...562A..17E

2014A&A...562A..17E - Astronomy and Astrophysics, volume 562A, 17-17 (2014/2-1)

Optical and near-infrared observations of SN 2011dh. The first 100 days.

ERGON M., SOLLERMAN J., FRASER M., PASTORELLO A., TAUBENBERGER S., ELIAS-ROSA N., BERSTEN M., JERKSTRAND A., BENETTI S., BOTTICELLA M.T., FRANSSON C., HARUTYUNYAN A., KOTAK R., SMARTT S., VALENTI S., BUFANO F., CAPPELLARO E., FIASCHI M., HOWELL A., KANKARE E., MAGILL L., MATTILA S., MAUND J., NAVES R., OCHNER P., RUIZ J., SMITH K., TOMASELLA L. and TURATTO M.

Abstract (from CDS):

We present optical and near-infrared (NIR) photometry and spectroscopy of the Type IIb supernova (SN) 2011dh for the first 100 days. We complement our extensive dataset with Swift ultra-violet (UV) and Spitzer mid-infrared (MIR) data to build a UV to MIR bolometric lightcurve using both photometric and spectroscopic data. Hydrodynamical modelling of the SN based on this bolometric lightcurve have been presented in Bersten et al. (2012ApJ...757...31B). We find that the absorption minimum for the hydrogen lines is never seen below ∼11000km/s but approaches this value as the lines get weaker. This suggests that the interface between the helium core and hydrogen rich envelope is located near this velocity in agreement with the Bersten et al. (2012ApJ...757...31B) He4R270 ejecta model. Spectral modelling of the hydrogen lines using this ejecta model supports the conclusion and we find a hydrogen mass of 0.01-0.04M to be consistent with the observed spectral evolution. We estimate that the photosphere reaches the helium core at 5-7 days whereas the helium lines appear between ∼10 and ∼15 days, close to the photosphere and then move outward in velocity until ∼40 days. This suggests that increasing non-thermal excitation due to decreasing optical depth for the γ-rays is driving the early evolution of these lines. The Spitzer 4.5µm band shows a significant flux excess, which we attribute to CO fundamental band emission or a thermal dust echo although further work using late time data is needed. The distance and in particular the extinction, where we use spectral modelling to put further constraints, is discussed in some detail as well as the sensitivity of the hydrodynamical modelling to errors in these quantities. We also provide and discuss pre- and post-explosion observations of the SN site which shows a reduction by ∼75 percent in flux at the position of the yellow supergiant coincident with SN 2011dh. The B, V and r band decline rates of 0.0073, 0.0090 and 0.0053mag/day respectively are consistent with the remaining flux being emitted by the SN. Hence we find that the star was indeed the progenitor of SN 2011dh as previously suggested by Maund et al. (2011ApJ...739L..37M) and which is also consistent with the results from the hydrodynamical modelling.

Abstract Copyright:

Journal keyword(s): supernovae: general - supernovae: individual: SN 2011dh - galaxies: clusters: individual: M51

VizieR on-line data: <Available at CDS (J/A+A/562/A17): table3.dat table5.dat table6.dat table10.dat>

CDS comments: Tables A.5 and A.8 reference stars not in SIMBAD.

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 GSC 00052-00955 * 02 33 28.8746127552 +05 19 48.400432680 14.682 14.486 13.809 13.426 13.057 ~ 7 0
2 GSC 00052-00856 PM* 02 33 34.0055021496 +05 19 30.957427884 16.134 15.11 14.05 13.74 12.779 ~ 11 0
3 UCAC2 33509289 * 02 33 40.0677079008 +05 17 40.692955632 13.750 13.479 12.768 12.363 11.974 ~ 9 1
4 PG 0231+051 WD* 02 33 41.3574299856 +05 18 43.649856216 14.562 15.776 16.096 16.267 16.639 DAO.6 144 0
5 GSC 00052-01627 * 02 33 45.5285810640 +05 17 33.322454664 17.525 16.169 14.732 13.781 12.799 ~ 8 0
6 GSC 00052-01506 * 02 33 48.1553068704 +05 20 26.341679292 14.463 14.385 13.707 13.311 12.924 ~ 8 1
7 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1351 1
8 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4237 3
9 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5653 6
10 NAME Great Attractor SCG 10 32 -46.0           ~ 524 0
11 V* UY Sex HS* 10 50 02.8265487864 -00 00 36.879009588 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 156 0
12 GSC 04914-00008 * 10 50 05.6546585640 -00 01 11.255400660 14.368 14.200 13.512 13.090 12.672 ~ 12 0
13 GSC 04914-00014 * 10 50 07.9165535112 -00 02 04.380832572 15.602 15.430 14.751 14.360 13.987 ~ 10 0
14 GSC 04914-00002 V* 10 50 13.6828932048 -00 00 32.339127276 13.041 13.060 12.453 12.075 11.716 ~ 12 0
15 NGC 4490 GiP 12 30 36.368 +41 38 37.07 10.03 10.22 9.79     ~ 553 3
16 SN 2008ax SN* 12 30 40.80 +41 38 16.1   23.6 23.5 14.1 22.6 SNIIb 240 1
17 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 493 0
18 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 563 0
19 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4137 4
20 SN 2005cs SN* 13 29 53.37 +47 10 28.2   14.5       SNIIP 376 1
21 SN 1994I SN* 13 29 54.072 +47 11 30.50     12.9     SNIc 606 1
22 SN 2011dh SN* 13 30 05.10555 +47 10 10.9227           SNIIb 345 1
23 PG 1525-071 HS* 15 28 11.5771773672 -07 16 32.899212840 13.658 14.85 14.89 15.14 15.197 sdO 36 0
24 GSC 05015-00549 * 15 28 12.0153331176 -07 16 39.325323900 17.170 16.865 16.301 15.890 15.544 ~ 4 0
25 GSC 05015-00075 * 15 28 13.4179300680 -07 16 01.038534204 14.561 14.279 13.506 13.069 12.644 ~ 6 0
26 [L92b] PG 1525-071 B * 15 28 14.3955155160 -07 16 13.273142736 17.262 17.121 16.392 15.942 15.486 ~ 4 0
27 GSC 05015-00255 * 15 28 16.5026959008 -07 14 30.354247140 15.708 14.635 13.519 12.926 12.423 ~ 5 0
28 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2614 0
29 UCAC2 28113771 * 20 43 53.5538027040 -10 45 05.233052916 15.738 15.562 14.767 14.296 13.815 ~ 2 0
30 UCAC2 28113774 * 20 43 54.9972403344 -10 45 31.310130060 15.302 15.206 14.540 14.161 13.789 ~ 12 0
31 UCAC2 28113781 * 20 43 58.4534592120 -10 47 12.253046280 16.506 16.520 15.911 15.544 15.171 ~ 10 0
32 [L92b] Mark A HS* 20 43 59.2253596272 -10 47 41.696051820 11.854 13.010 13.256 13.370 13.494 sdO 68 1
33 [L92b] Mark A3 * 20 44 03.8151050520 -10 45 37.977226668 16.407 15.756 14.818 14.231 13.720 ~ 10 0
34 PG 2331+055 * 23 33 44.4698554608 +05 46 39.793017432 14.629 15.116 15.182 15.194 15.226 sd 34 0
35 GSC 00591-00570 * 23 33 51.1325276328 +05 45 09.012322332 15.992 15.563 14.744 14.263 13.809 ~ 4 0

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2022.11.28-09:47:45

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