The Italian Supernovae Search Project (ISSP) is the new collaboration between the main four rItalian groups operating in the extragalactic supernova research field: the CROSS of Col Drusciè Observatory - Cortina d'Ampezzo (Belluno), the MOSS of Montarrenti Observatory (Siena), the MASACAS of Monte Agliale Observatory (Lucca) and the MVSS of Montecatini Val di Cecina Observatory (Pisa).

The collaboration aims to create a joint supernova research program that allows to monitor many stellar field as frequently as possible searching for supernova explosions.

The Italian Supernovae Search Project (ISSP) is the new collaboration between the main four rItalian groups operating in the extragalactic supernova research field: the CROSS of Col Drusciè Observatory - Cortina d'Ampezzo (Belluno), the MOSS of Montarrenti Observatory (Siena), the MASACAS of Monte Agliale Observatory (Lucca) and the MVSS of Montecatini Val di Cecina Observatory (Pisa).

The collaboration aims to create a joint supernova research program that allows to monitor many stellar field as frequently as possible searching for supernova explosions.
  • Twitter
  • Facebook

LBV outburst in NGC 2403

E-mail Print PDF

LBV (SNhunt225) in NGC 2403 new outburst pinpointed by Paolo Campaner on 2nd November 2014. Also classified as PSN J07370423+6535509. Mag 18.5.

Visualizzazione di LBV_ngc2403_progenitor.jpg

==============================================================================
ATEL #6756                                                           ATEL #6756

Title:  Spectroscopic classification and progenitor identification
of SNhunt225
Author: F. Taddia, J. Sollerman (Oskar Klein Centre and Stockholm
University), N. Elias-Rosa and A. Pastorello (Osservatorio Astronomico
di Padova)
Queries: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Posted: 26 Nov 2014; 16:28 UT
Subjects:Optical, Supernovae

We report that an optical spectrum (range 330-900 nm; resolution 1.7 nm)
of PSN J07370423+6535509 = SNhunt225 (CBAT "Transient Object Followup Reports")
was obtained at the Nordic Optical Telescope (+ ALFOSC) on Nov. 24.2 UT.
The spectrum shows a red continuum with a weak, unresolved Halpha in emission.
The position of the narrow Halpha is consistent with that expected from
the modest recessional velocity of the host galaxy NGC 2403 (V_rec = 133
km/s; Sellwood & Sanchez, 2010, MNRAS, 404, 1733, via NED). The spectrum
is very similar to that of the "supernova impostor" UGC 2773 OT2009-1 (Foley
et al. 2011, ApJ, 732, 32), and therefore SNhunt225 is most likely an LBV-like
eruption of a massive star.

Using the acquisition image of SNhunt225 obtained at NOT Telescope (+ALFOSC),
we geometrically matched deep archival Hubble Space Telescope (HST; available
at Hubble Legacy Archive) image mosaics obtained with  different configurations:
F439W (~B) filter taken with WFPC2 on 1994 April (GO-5383; PI: L. Drissen);
F475W (~SDSS g), F606W (~V) and F814W (~I) taken with ACS/WFC on 2004 August
(GO-10182; PI: A. Filippenko). We isolated a clear source (with a precision
between 0.05" and 0.08") in the all HST images, at the accurately measured
position of SNhunt225: R.A. = 07h37m04.189s and Dec. = +65d35m46.957s.
A finder chart for the candidate progenitor is provided at <a href=http://ttt.astro.su.se/~ftadd/positionsnhunt225_f606w.jpeg>

http://ttt.astro.su.se/~ftadd/positionsnhunt225_f606w.jpeg</a>.

Using the Dolphot package (Dolphin 2000 PASP, 112, 1383), the magnitudes
of the recovered HST source are: F439W = 20.94 +/- 0.01, F475W = 20.75
+/- 0.01, F606W = 20.43 +/- 0.01 and F814W = 20.11 +/- 0.01. Assuming a
distance modulus to NGC 2403 of 28.29 +/- 0.15 mag, as inferred from the
average recessional velocity of the galaxy corrected for the Local Group
infall into the Virgo cluster + the Great Attractor + the Shapley Supercluster
(NASA/IPAC Extragalactic Database - NED), and adopting Galactic reddening
of E(B-V) = 0.035 (Schlafly & Finkbeiner 2011, ApJ, 737, 103), we obtain
absolute magnitudes of -7.49, -7.67, -7.97 and -8.24 in the (approximate)
B, SDSS g, V and I bands, respectively, and a intrinsic colour of B-V =
0.48 mag for the HST source.

We note that the coordinates of SNhunt225 are quite close, but not coincident,
to those reported in the literature for the variable V22 in NGC 2403 (R.A.
= 07h37m04.75s, Dec=+65d35m49.7s, J2000.0;
Artyukhina et al. 1996, General Catalogue of Variable Stars, Vol. V.: Extragalactic
Variable Stars). V22 was classified as a likely LBV by Tamman & Sandage
1968, ApJ 151, 825. However, from a visual inspection of the identification
map (Figure 3 in Tamman & Sandage, 1968), we suggest that SNhunt225, the
recovered HST source and the historical V22 may be the same object.
The approximate B-band magnitude in the HST image is consistent with those
observed for V22 by Tammann and Sandage from 1910 to 1963 (in the range
20.2 to 21.8 mag; see their Figure 10).
For this reason, we cannot rule out that SNhunt225 can be a re-brightnening
of V22, and the apparent mismatch in the coordinates is due to previous
incorrect position measurements of V22.

PSN J11023520+5035094 discovered on November 20th 2014 in UGC6109

E-mail Print PDF

PSN J11023520+5035094 (RA 11h02m35.20s - DEC +50°35'09.4") discovered on November 20th 2014 in the galaxy UGC6109 (offset 2E 13N) magnitude 17.1 Type II (z=0.0223).

SN discoveres: F. Ciabattari, E.Mazzoni, M.Rossi, P.Campaner (Newton 20" - Monte Agliale Observatory - Lucca, Italy).

CLASSIFICATION ATEL

==============================================================================
ATEL #6750                                                           ATEL #6750

Title:  Asiago spectroscopic classification of six supernovae
Author: P. Ochner, S. Benetti, A. Pastorello, L. Tomasella, E. Cappellaro,
N. Elias-Rosa, L. Tartaglia, G. Terreran, M. Turatto (INAF Osservatorio
Astronomico di Padova)
Queries: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Posted: 25 Nov 2014; 14:48 UT
Subjects:Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN,
335, 841) reports the spectroscopic classification
of the following transients. Targets were supplied by the Gaia Photometric
Science Alerts programme and by the CBAT Transient Objects Confirmation
Page (TOCP).

The observations were performed with the Asiago 1.82 m Copernico Telescope

(+AFOSC; range 340-820 nm; resolution 1.2 nm).

Name                    | Date (UT)    |  z       |   Type      |  Phase
| Notes
PSN J01510872+3155218   | 20141124.81  |  0.26    |   SLSNII  ? |
| (1)
PSN J07591099+3254392   | 20141124.94  |  0.0174  |    IIn      |  2 weeks
| (2)
PSN J11023520+5035094   | 20141124.97  |  0.0223  |    II       |  10 days
| (3)
Gaia14adb               | 20141125.10  |  0.053   |    Ia       |  +20d
| (4)
Gaia14adf               | 20141125.12  |  0.06    |    II       |  2 weeks
| (5)
Gaia14adg               | 20141125.14  |  0.154   |    II       |  around
max | (6)

(1) The spectrum shows a blue continuum and broad features which can be
consistent with Balmer lines (Hbeta and Hgamma), with superimposed narrow
unresolved components. Narrow [OIII] lines are also detected. Accounting
for the very luminous absolute mag of the transient (M~-22.6), the transient
is consistent with both a SLSNII and an AGN.
The redshift of the host galaxy SDSS J015108.70+315520.6, as derived from
narrow emissions, is in fair agreement with its photometric redshift (z=0.241).

(2) Heliocentric radial velocity of the host galaxy UGC 4132 from de Vaucouleurs
et al. 1991 RC3.9 via NED.

(3) Heliocentric radial velocity of the host galaxy UGC 6109 from Falco
et al.  1999 PASP 111, 438 via NED. UGC 6109 is the same host galaxy as
for SN 2007rt.

(4) The transient is close to SDSS galaxy SDSS J120512.03+215018.1, with
photometric redshift z=0.05. The spectrum shows this is
a type-Ia SN about 2 weeks after the maximum light. An expansion velocity
of 9500 km/s is derived from the position of the minimum of the Si II 635.5-nm
line.

(5) The transient is close to SDSS J120929.60+200613.3, with photometric
redshift z=0.076.

(6) The transient is close to SDSS J115032.78-020617.0, with photometric
redshift z=0.167.

Classification was done with GELATO (Harutyunyan et al. 2008, A&A, 488,
383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024).
The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.

We acknowledge, for the Gaia transients, ESA Gaia (http://cosmos.esa.int/gaia),
and the DPAC Photometric Science Alerts Team (http://gaia.ac.uk/selected-gaia-science-alerts)
(Rixon et al, 2014, ATel #6593).

Padova Asiago SN group: http://sngroup.oapd.inaf.it
------------------------------------------------------------------------------
==============================================================================