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SN 2011dh in M51

Monitored from  Braniborg Tower Observatory (BTO), Zielona Gora, Poland and Skinakas Observatory (SKO), Crete, Greece
We monitor supernova SN 2011dh that exploded in M51 in late May 2011. We are using both a 14-inch Meade LX200 telescope equipped with an SBIG ST-8XE CCD camera from BTO and the 1.3 m telescope in Skinakas Observatory. In BTO, we use either a clear filter and calibrate the images to SDSS g-band (with an alignment of 0.02 mag rms) or the V Bessel filter (not in the table yet). In SK, we use B, V, R, I, and H alpha filters.

Skinakas Observatory is a collaborative project of the University of Crete, the Foundation for Research and Technology -- Hellas, and the Max-Planck-Institute for Extraterrestrial Physics.

 

Image Subtraction of the Skinakas images

In the upper row, we show the original Skinakas images taken on July 1, 2, 3, 6, 8, 10 and 12 (from left to right). In the bottom row, we present the subtracted images where all non-varying sources are subtracted off and only the variable SN is present. Its flux is declining (increasing negative fluxes from left to right). The far left image was used as the template image, so after subtraction from itself the image contains only zero flux across the ccd chip.


SKO R-band light curve

 


 

BTO g-band light curve

 


 

Data

Date Time JD Magnitude erg/sec L_Sun # images
2011 June 07 22:07:17 UT 245 5720.42172 g = 13.66 +/- 0.03 5.94 x 10^41 1.54 x 10^8 BTO: 3
2011 June 17 20:43:51 UT 245 5730.36378 g = 12.62 +/- 0.03 15.49 x 10^41 4.02 x 10^8 BTO: 4
2011 June 27 21:18:23 UT 245 5740.38777 g = 12.74 +/- 0.02 13.87 x 10^41 3.60 x 10^8 BTO: 7
2011 June 28 22:35 UT 245 5741.44122 g = 12.86 +/- 0.02 12.42 x 10^41 3.22 x 10^8 BTO: 40
2011 July 01 19:07 UT 245 5744.29525 R = 12.715 +/- 0.001 8.67 x 10^41 2.25 x 10^8 SKO: 5 images/430 sec (DIA template)
2011 July 02 19:04 UT 245 5745.29455 R = 12.781 +/- 0.001 8.16 x 10^41 2.12 x 10^8 SKO: 3 images/120 sec
2011 July 03 18:48 UT 245 5746.28311 R = 12.845 +/- 0.002 7.69 x 10^41 1.99 x 10^8 SKO: 3 images/180 sec
2011 July 06 18:49 UT 245 5749.28369 R = 13.012 +/- 0.002 6.59 x 10^41 1.71 x 10^8 SKO: 3 images/180 sec
2011 July 08 18:47 UT 245 5751.28371 R = 13.096 +/- 0.002 6.10 x 10^41 1.58 x 10^8 SKO: 1 image/90 sec
2011 July 10 18:40 UT 245 5753.27814 R = 13.219 +/- 0.002 5.45 x 10^41 1.41 x 10^8 SKO: 1 image/80 sec
2011 July 12 19:40 UT 245 5755.32008 R = 13.201 +/- 0.002 5.54 x 10^41 1.44 x 10^8 SKO: 1 image/80 sec




BTO images




 

Observers

Andrzej Szary, Michal Zejmo, Mateusz Wisniewicz, Alexandros Filothodoros, Agnieszka Slowikowska, Szymon Kozlowski

The images and light curves presented here are a part of the master's dissertation of Michal Zejmo, student at the Institute of Astronomy, University of Zielona Gora, Poland.