PSN J09554214+6940260 in M82 - mag V 11.7
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PSN J09554214+6940260 in M82 - mag V 11.7
Discovery: Stephen J. Fossey
First follow-up by Seiichiro Kiyota.
Nicely placed in the sky!
http://www.cbat.eps.harvard.edu/unconf/ ... 40260.html
Image:
http://meineko.sakura.ne.jp/ccd/PSN_J09 ... 940260.jpg
Paolo
EDIT: discovery name corrected
First follow-up by Seiichiro Kiyota.
Nicely placed in the sky!
http://www.cbat.eps.harvard.edu/unconf/ ... 40260.html
Image:
http://meineko.sakura.ne.jp/ccd/PSN_J09 ... 940260.jpg
Paolo
EDIT: discovery name corrected
Last edited by Paolo Berardi on Sun Mar 02, 2014 9:49 pm, edited 1 time in total.
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Hi all, we were able to observe the SN this night in a small window between clouds. We used Lhires III spectrograph with 150 l/mm grating, only 20 minutes total exposure.
![Image](http://quasar.teoth.it/html/spectra/_sn_m82_20140122_921.jpg)
The spectrum confirms a reddened continuum and the strong sodium (D1D2) narrow absorption suggests an interstellar origin of these effects.
First two results from Gelato automatic comparison:
![Image](http://quasar.teoth.it/html/spectra/plot_Yi9E3i1w0FV6.png)
![Image](http://quasar.teoth.it/html/spectra/2_plot_Yi9E3i1w0FV6.png)
Ciao
Paolo and Giuseppe
![Image](http://quasar.teoth.it/html/spectra/_sn_m82_20140122_921.jpg)
The spectrum confirms a reddened continuum and the strong sodium (D1D2) narrow absorption suggests an interstellar origin of these effects.
First two results from Gelato automatic comparison:
![Image](http://quasar.teoth.it/html/spectra/plot_Yi9E3i1w0FV6.png)
![Image](http://quasar.teoth.it/html/spectra/2_plot_Yi9E3i1w0FV6.png)
Ciao
Paolo and Giuseppe
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Photometry at the same time gave
B = 12.78
V = 11.49
R = 10.72
I = 10.31
David
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
A spectrum from tonight using a prototype high dispersion Star Analyser mounted in a filter wheel just 26mm from the camera sensor giving R~120 at 6000A. It confirms a reddened type 1a supernova.
I have overlaid Paolo's spectrum from last night for comparison
Cheers
Robin
I have overlaid Paolo's spectrum from last night for comparison
Cheers
Robin
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- SN2014J_20130123-82_THO_prototype_SA_HD_overlay.png (22.87 KiB) Viewed 19807 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
http://www.threehillsobservatory.co.uk
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Hi all, a new observation of 25 jan with Lhires III 150 and about two hours integration,
![Image](http://quasar.teoth.it/html/spectra/SN2014j_20140125_806.jpg)
SN should be around mag V 11. During exposures we had several cloud passages and turbulence was very strong. We estimate an FWHM of about 6 arcsec, with star images much more wider than the slit aperture (30 micron). I think there was a huge efficiency loss. This is a guide camera frame, note the star size compared to slit aperture:
![Image](http://quasar.teoth.it/html/spectra/SN2014j_slit.jpg)
Fortunately that is not a normal situation from my observing site!
Follows a comparison that shows spectrum evolution from 22 to 25 jan. Envelope expansion velocity derived from Si II minimum has decreased from about 14400 to 12800 Km/s. A similar trend (decreasing) seems to be shown by other absorption lines.
![Image](http://quasar.teoth.it/html/spectra/SN2014j_comparison.jpg)
The slit also captured H-alpha + NII emissions of a nearby region (Lhires III slit view and spectrum):
![Image](http://quasar.teoth.it/html/spectra/slit_view.jpg)
Considering scale and angle, emission should be related to highlighted area in this wonderful M82 image by HST (original at http://en.wikipedia.org/wiki/File:M82_H ... ge_web.jpg):
![Image](http://quasar.teoth.it/html/spectra/slit_hst.jpg)
Sorry for a such long post... I'm sending fit to François.
Ciao
Paolo
![Image](http://quasar.teoth.it/html/spectra/SN2014j_20140125_806.jpg)
SN should be around mag V 11. During exposures we had several cloud passages and turbulence was very strong. We estimate an FWHM of about 6 arcsec, with star images much more wider than the slit aperture (30 micron). I think there was a huge efficiency loss. This is a guide camera frame, note the star size compared to slit aperture:
![Image](http://quasar.teoth.it/html/spectra/SN2014j_slit.jpg)
Fortunately that is not a normal situation from my observing site!
Follows a comparison that shows spectrum evolution from 22 to 25 jan. Envelope expansion velocity derived from Si II minimum has decreased from about 14400 to 12800 Km/s. A similar trend (decreasing) seems to be shown by other absorption lines.
![Image](http://quasar.teoth.it/html/spectra/SN2014j_comparison.jpg)
The slit also captured H-alpha + NII emissions of a nearby region (Lhires III slit view and spectrum):
![Image](http://quasar.teoth.it/html/spectra/slit_view.jpg)
Considering scale and angle, emission should be related to highlighted area in this wonderful M82 image by HST (original at http://en.wikipedia.org/wiki/File:M82_H ... ge_web.jpg):
![Image](http://quasar.teoth.it/html/spectra/slit_hst.jpg)
Sorry for a such long post... I'm sending fit to François.
Ciao
Paolo
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Thank you for this acurate description Paolo
According to ATel 5818, the interstellar extinction is E(B-V) = 1.2
which confirms your continuum and the strong Na I D interstellar line
François
ATEL #5818 ATEL #5818
Title: SN2014J spectroscopic and photometric data
Author: INAF-Astronomical Observatory of Bologna
Queries: giuseppe.altavilla@oabo.inaf.it
Posted: 27 Jan 2014; 10:44 UT
Subjects:Optical, Star, Supernovae
Spectra and BVR images of the supernova SN 2014J in the nearby galaxy M82
were obtained on
Jan. 23.05 2014 (UT) a the 1.5m G.D. Cassini Telescope (Loiano) with BFOSC
by G. Altavilla, R. Gualandi and I. Bruni. The spectra, obtained with gr4,
gr7 and gr8 and a 2" slit, cover the ~3500-8000 A range with a resolution
of ~12, ~6 and ~6 A respectively. The expansion velocity measured from
the SiII line (6355A) is ~13900km/s while SII (5640)A gives ~12000 km/s.
The best matches obtained with the GEneric cLAssification TOol (GELATO,
Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi)
are with SN2000fa (Ia at 12 days before maximum) and SN1997do (Ia at 8
days before maximum).
Magnitude estimates for the same night (JD 2456680.55208) are the following:
B=12.72+-0.14, V=11.52+-0.23, R 11.05 +-0.05. To be noted the corresponding
colour: B-V=1.2 (instead of B-V~0 for a normal type Ia at the same epoch),
supported by the strong NaD features visible in the spectra.
According to ATel 5818, the interstellar extinction is E(B-V) = 1.2
which confirms your continuum and the strong Na I D interstellar line
François
ATEL #5818 ATEL #5818
Title: SN2014J spectroscopic and photometric data
Author: INAF-Astronomical Observatory of Bologna
Queries: giuseppe.altavilla@oabo.inaf.it
Posted: 27 Jan 2014; 10:44 UT
Subjects:Optical, Star, Supernovae
Spectra and BVR images of the supernova SN 2014J in the nearby galaxy M82
were obtained on
Jan. 23.05 2014 (UT) a the 1.5m G.D. Cassini Telescope (Loiano) with BFOSC
by G. Altavilla, R. Gualandi and I. Bruni. The spectra, obtained with gr4,
gr7 and gr8 and a 2" slit, cover the ~3500-8000 A range with a resolution
of ~12, ~6 and ~6 A respectively. The expansion velocity measured from
the SiII line (6355A) is ~13900km/s while SII (5640)A gives ~12000 km/s.
The best matches obtained with the GEneric cLAssification TOol (GELATO,
Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi)
are with SN2000fa (Ia at 12 days before maximum) and SN1997do (Ia at 8
days before maximum).
Magnitude estimates for the same night (JD 2456680.55208) are the following:
B=12.72+-0.14, V=11.52+-0.23, R 11.05 +-0.05. To be noted the corresponding
colour: B-V=1.2 (instead of B-V~0 for a normal type Ia at the same epoch),
supported by the strong NaD features visible in the spectra.
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Very interesting Francois. I also got a good fit with SN 1997do if I simulate a de-redden from E(B-V)=1 (spectrum of 22 jan).
http://quasar.teoth.it/forums/download/ ... &mode=view
Do ATel mention B-V, not IS reddening? The problem seems that there is an upper limit because the SN is already too bright, considering the distance, for an E(B-V) high value.
Now the SN has reach about mag V 10.7. We hope continue to grow!
See you soon!
Paolo
http://quasar.teoth.it/forums/download/ ... &mode=view
Do ATel mention B-V, not IS reddening? The problem seems that there is an upper limit because the SN is already too bright, considering the distance, for an E(B-V) high value.
Now the SN has reach about mag V 10.7. We hope continue to grow!
See you soon!
Paolo
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Excellent ! Paolo
That matches very well
Yes, ATel gives B-V and compares the value to expected B0-V0= 0 value (without reddening)
*B-V=1.2 (instead of B-V~0 for a normal type Ia at the same epoch)"
So you get E(B-V) = (B-V) - (B0-V0) = 1.2
Ciao,
François
That matches very well
Yes, ATel gives B-V and compares the value to expected B0-V0= 0 value (without reddening)
*B-V=1.2 (instead of B-V~0 for a normal type Ia at the same epoch)"
So you get E(B-V) = (B-V) - (B0-V0) = 1.2
Ciao,
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Hello,
here is my first spectrum of SN2014J.
Date: 24/01/2014
Observatory: SMU Castor
Instrument: CN212/3.9 Alpy 600 ST7
Autoguider lodestar.
Exp time 22*300s.
http://astrosurf.com/heidemann/sn2014j.png
clear skies
Tony Heidemann
St. Martin d'Uriage ( France)
here is my first spectrum of SN2014J.
Date: 24/01/2014
Observatory: SMU Castor
Instrument: CN212/3.9 Alpy 600 ST7
Autoguider lodestar.
Exp time 22*300s.
http://astrosurf.com/heidemann/sn2014j.png
clear skies
Tony Heidemann
St. Martin d'Uriage ( France)
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Re: PSN J09554214+6940260 in M82 - mag V 11.7
Le spectre de Tony Heidemann
![Image](http://astrosurf.com/heidemann/sn2014j.png)
![Image](http://astrosurf.com/heidemann/sn2014j.png)
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr