Ricerca Supernove

L’osservatorio astronomico di Lajatico è una struttura finalizzata per gran parte alla ricerca scientifica. I vari telescopi disponibili sono impegnati in survey e osservazioni di oggetti celesti a fini di ricerca in astronomia, astrometria e astrofisica.

I dati geografici sono:

Latitudine N 43°25’45”

Longitudine E 10°43’1″

Altitudine 500 metri

RICERCA SUPERNOVAE EXTRAGALATTICHE Il programma di ricerca di supernovae extragalattiche gestito dalla nostra associazione si basa principalmente sull’utilizzo di due dei vari telescopi disponibili:

Un C14 Celestron diametro 35 cm focale 3910 mm ai quale viene apprilacta una camera CCD  DTA KAF261 .

Il programma prevede la survey di oltre 4500 galassie dell’emisfero boreale, spingendosi fino a declinazioni negative di circa -30° -35°. Questa lista di galassie è stata ottenuta seguendo il criterio del modulo di distanza, cioè sono state escluse tutte quelle galassie troppo lontane dove un’eventuale esplosione di una supernova rimarrebbe al di fuori della portata dei nostri strumenti. Queste liste sono poi state ottimizzate e rese omogenee per fasce di Declinazione ed A.R. permettendo ai telescopi di trovare il tragitto più breve fra una galassie e la successiva. Nelle notti serene viene ripreso il maggior numero di galassie possibili ottenendo due immagini per ogni singola galassia con un esposizione di 60 secondi che permette di raggiungere la magnitudine limite di circa +19,00/+19,50. La mattina seguente le immagini vengono caricate su un apposito sito e poi scaricate e controllate dai vari controllori dell’associazione. In caso di sospetta supernova viene immediatamente ripresa una nuova immagine di conferma oppure, se il meteo non lo permette, vengono allertati altri osservatori che collaborano con la nostra associazione. Montecatini vc Astronomical Center è infatti uno dei membri dell’ISSP Italian Supernovae Search Project un programma congiunto tra quattro dei maggiori gruppi di ricerca di supernovae italiani: il CROSS dell’Osservatorio del Col Drusciè – Cortina (Belluno), il MOSS dell’Osservatorio di Montarrenti (Siena), il MASACAS dell’Osservatorio di Monte Agliale (Lucca) e il MVSS di Montecatini Val di Cecina (Pisa). Lo scopo della collaborazione è quello di realizzare un programma comune di ricerca che permetta di scandagliare il più ampio numero di campi stellari e con la massima frequenza possibile, alla ricerca di eventi di supernova. La collaborazione, nata ufficialmente il 4 giugno 2011 a seguito di un meeting tra i principali esponenti dei gruppi tenutosi a Montecatini Val di Cecina, consiste nel suddividere l’intero cielo osservabile in zone distinte di competenza osservativa. Obiettivo della collaborazione è l’ottimizzazione della ricerca, unendo gli sforzi dei singoli gruppi per cercare di aumentare la produttività nelle scoperte di supernova. Lo scambio rapido di informazioni via Internet tra i partecipanti dell’ISSP rende inoltre possibile la ripresa rapida di immagini di conferma in caso di dubbio supernova.

Pubblicazioni per la ricerca supernovae.

independent discovery supernova in UGC11322

Co-discovery con astrofili cinesi, Zhijian Xu e Xing Gao. Supernova in UGC11322 telescopio C14 celestron con CCD camera DTA KAF1001E

Pubblicazione.

SUPERNOVA 2012ek IN PGC 62237 = PSN J18402884+3607174 Zhijian Xu, Nanjing, Jiangsu, China; and Xing Gao, Urumqi, Xinjiang, >China, report the discovery of a possible supernova (mag approximately 17.9) >on a 40-s unfiltered CCD image (limiting mag about 18.8) taken by Xing Gao >in the course of the Xingming Sky Survey around Aug. 18.810 UT using a >0.36-m f/6.9 Celestron C14 telescope at Mt. Nanshan. The new object is approximately located at R.A. = 18h40m28s.84, Decl. = +36d07’17″.4 (equinox >2000.0; reference stars from USNO-B1.0 catalogue), which is about 13″.6 >west and 12″.2 south of the center of the PGC 62237. Nothing is visible at >this position on a red Digitized Sky Survey plate from 1992 Aug. 20 >(limiting mag about 19.8). The Xingming images are posted at website URL http://www.xjltp.com/XOSS/XM48ZX/XM48ZX.htm. The object was designated PSN >J18402884+3607174 when it was posted at the Central Bureau’s TOCP webpage >and is here designated SN 2012ek based on the spectroscopic confirmation >reported below. Additional CCD magnitudes for 2012ek (unfiltered unless >noted otherwise): 2012 Aug. 7, [19.0 (Xu and Gao); Aug. 19.64, 17.9 (Xu >and Gao; image posted at the following website URL: http://www.flickr.com/photos/75341417@N06/7816496822/in/p hotostream); >Aug. 19.896, 17.8 (Fabio Briganti and Fabio Martinelli, Celestron 14 >telescope; independent discovery in the course of survey of the Italian >Supernovae Search Project); Aug. 20.206, 18.1 (J. Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera + >luminance filter at the New Mexico Skies Observatory near Mayhill, NM, >U.S.A.; position end figures 28s.92, 16″.6; image posted at http://www.flickr.com/photos/43846774@N02/7824016820/); Aug. 20.62, 17.7 >(Xu and Gao).

M. Turatto, S. Benetti, A. Pastorello, L. Tomasella, M. Fiaschi, P. >Ochner, E. Cappellaro, and S. Valenti, Osservatorio Astronomico di Padova, >Istituto Nazionale di Astrofisica, report that a spectrogram of PSN J18402884+3607174 = SN 2012ek, obtained on Aug. 21.79 UT with the Asiago >1.82-m Copernico Telescope (+ AFOSC; range 340-820 nm; resolution 1.4 nm), >indicates that it is a type-Ib supernova. Adopting for the host galaxy (PGC 62237) a redshift z = 0.028563 (Freudling et al. 1995, A.Ap. Suppl. >112, 429; via NED), comparison with a library of supernovae spectra via >GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383) shows close similarities >of the spectrum of 2012ek to spectra of several type-Ib supernovae one week >after maximum.

NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes superseded by text appearing later in the printed IAU Circulars. > (C) Copyright 2012 CBAT 2012 August 28 (CBET 3212) Michael Rudenko

Scoperta supernova in NGC 6619 la notte del 08/08/2012 da Fabio Martinelli e Riccardo Mancini.

Ripresa effettuata con telescopio SC da 35 cm C 14 celestron, ccd camera DTA con sensore KAF1001E ripresa di 50 sec esposizione su montatura CGE-PRO.

In collaborazione con ISSP, Italian supernovae search project.

PSN J18185620+2339370

CBAT

2012 08 08.0625

Reports the discovery by Fabio Martinelli and Riccardo Mancini of an apparent supernova (mag about 16.5) on unfiltered CCD images (limiting mag about 18.0) taken with 0.35-m telescope of the Osservatorio Astronomico Montecatini val di Cecina, Italy, behalf of the Italian Supernovae Search Project (ISSP) on Agu. 08.0625 UT. The new object is located at R.A. = 18h18m56s.2, Decl. = +23d39’37″.0 (equinox 2000.0), which is 11″ east and 17″ nord of the nucleus of NGC 6619. Nothing is visible at this position on Palomar Sky Survey infrared, red, and blue plates.

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu Questo indirizzo e-mail è protetto dallo spam bot. Abilita Javascript per vederlo. (alternate cbat@iau.org  (Questo indirizzo e-mail è protetto dallo spam bot. Abilita Javascript per vederlo. ) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network

SUPERNOVA 2012dz IN NGC 6619 = PSN J18185620+2339370 Fabio Martinelli and Riccardo Mancini report the discovery of an apparent supernova (mag about 16.5) on unfiltered CCD images (limiting mag about 18.0) taken with a 0.35-m telescope of the Osservatorio Astronomico Montecatini val di Cecina, Italy, in the course of the Italian Supernovae Search Project on Aug. 8.0625 UT. The new object is located at R.A. = 18h18m56s.2, Decl. = +23d39’37″.0 (equinox 2000.0), which is 11″ east and 17″ north of the nucleus of NGC 6619. Nothing is visible at this position on Palomar Sky Survey infrared, red, and blue plates. The variable was designated PSN J18185620+2339370 when it was posted at the Central Bureau’s TOCP webpage and is here designated SN 2012dz based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012dz: July 21.78, [19.2 (D. Denisenko and V. Lipunov, Sternberg Astronomical Institute at Lomonosov, Moscow State University; MASTER-Kislovodsk images); Aug. 7.615, 16.6 (Denisenko and Lipunov; two unfiltered 60-s images taken with the 0.40-m f/2.5 MASTER Amur robotic telescope + 16-megapixel camera; pre-discovery; position end figures averaged from two exposures are 56s.00, 32″.9); Aug. 8.865, R_c = 16.1 (Massimiliano Martignoni, Magnago, Italy, 25-cm f/10 reflector). A comparison of the Aug. 7 and June 20 MASTER-Amur images is posted at website URL

http://master.sai.msu.ru/static/OT/PSNJ18185620+2339370-MASTER-Amur.jpg.

L. Tomasella, P. Ochner, A. Pastorello, S. Benetti, E. Cappellaro, M. Turatto, and S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that a spectrogram of PSN J18185620+2339370 = 2012dz, obtained on Aug. 8.88 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 340-820 nm; resolution 2.4 nm), suggests that this is a normal type-Ia supernova. Adopting for the host galaxy, NGC 6619, a redshift z = 0.016805 (Wegner et al. 2003, A.J. 126, 2268; via NED), comparison with a library of supernovae spectra via GELATO (Harutyuyan et al. 2008, A.Ap. 488, 383) shows that it is a type-Ia event, a few days after B-maximum light.

NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes superseded by text appearing later in the printed IAU Circulars.

(C) Copyright 2012 CBAT 2012 August 9 (CBET 3198) Daniel W. E. Green

  Scoperta Supernova in NGC 5806

Scoperta un altra supernova dal team ISSP Italian Supernovae Search Project, questa volta è stato Fabio Briganti, responsabile della ricerca supernovae presso l’osservatorio astronomico di Montecatini val di Cecina Pisa. L’immagine è stata effettuata con il telescopio da 28cm C11 celestron presso l’osservatorio di Cortina la mattina del 22 gennaio. Controllo da parte di Fabio Briganti, immagine ottenuta tramite controllo robotizzato da Alessandro Dimai. Complimenti al nostro coordinatore per la ricerca SN.

Montecatini astronomical centre redazione. PSN J14595904+0153251 (A.R. 14 59 59.04, Dec. +01 53 25.1) scoperta il 22 gennaio 2012 nella galassia NGC5806 (offset 10W 1S), magnitudine 15.0. PSN scoperta da F. Briganti con il telescopio Schmidt Cassegrain da 11″ dell’Osservatorio del Col Drusciè (Cortina d’Ampezzo). Un ulteriore immagine dellaSN in NGC 5806 ripresa la mattina del 26 gennaio dall’osservatorio astronomico di Montecatini val di Cecina con telescopio meade 35cm e camera SBIG STXME KAF1600.

Atel inerenti alle osservazioni della Supernova. The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf ) reports the discovery of a new supernova in NGC 5806 (independently discovered by F. Briganti and reported as PSN J14595904+0153251 on Jan 22). The source is located at RA = 14:59:59.08, Dec = +01:53:24.2 (J2000), was first detected by the Palomar 1.2m telescope with an R-band magnitude of about 17 on 2012 Jan 10 (UT) and brightened to about 16.1 mag on Jan 20. PTF did not detect the source prior to 2012 Jan 5. Spectroscopic follow-up was performed with the HET (+LRS) on Jan 14, the INT (+IDS) on Jan 15-18, Gemini N (+GMOS) on Jan 17 and the Palomar 5m (+DBSP) on Jan 18. The spectra show prominent H features as well as He absorption at about 10,000 km/s, consistent with a type IIb classification. Credential Certification: Christopher J. Stockdale (chris.stockdale@mu.edu)

Subjects: Radio, X-ray, Supernovae

We report the detection of radio emission near the position of the type-IIb supernova PTF2012os (ATEL #3881) with the Karl G. Jansky Very Large Array radio telescope in the DnC configuration: A flux density of 0.44 +/- 0.05 mJy was measured at 5.02 GHz (wavelength 6.0 cm) on 2012 Jan. 22.42 UT. The measured position of the radio emission of R.A. = 14h59m59.s12, Decl. = +01d53m23s.3, equinox 2000.0 is in good agreement with the measured optical position of (ending digits) R.A. = 59.s08, Decl. = 24s.2, equinox 2000.0 (ATEL #3881). Radio observations are continuing. Using 9.4 ks of co-added Swift X-Ray Telescope (XRT) data, obtained on 2012-01-14 (2.0 ks exposure time; PI Kasliwal), 2012-01-16 (2.4 ks; PI Kasliwal), and 2012-01-24 (5.0 ks; PI Immler), no X-ray source is detected at the position of the SN. The PSF, dead-time, and vignetting corrected upper limit to the XRT net count rate is 1.1E-03 cts/s (3-sigma), corresponding to an unabsorbed (0.2-10 keV band) X-ray flux limit of 5.4E-14 erg/cm/cm/s and a luminosity limit of 4.2E39 erg/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of 4.14E+20 (Dickey & Lockman, 1990, ARAA 28) and a distance of 25.4 Mpc (NED). Swift observations are continuing. The object warrants further study in all wavelength bands. Credential Certification: Schuyler D. Van Dyk (vandyk@ipac.caltech.edu)

Subjects: Optical, Supernovae, Transient, Variables

Schuyler D. Van Dyk (Spitzer Science Center/Caltech), Avishay Gal-Yam, Iair Arcavi (Weizmann Institute), Mansi M. Kasliwal (OCIW/Princeton), and Assaf Horesh (Caltech), on behalf of the larger PTF collaboration, report their attempt to identify the progenitor of the Type IIb supernova PTF12os, aka PSN J14595904+0153251, in archival Hubble Space Telescope (HST) ACS/WFC F435W, F555W, and F814W images from 2005 March 10 UT (PI: Smartt). We have astrometrically matched a B-band image (with 0.87″ seeing) from 2012 January 18 UT obtained with the IMACS camera on the Magellan Baade 6.5 m telescope at Las Campanas Observatory, Chile, with the ACS F435W image, using 10 fiducial stars in common. The SN position has been located on the ACS image with an uncertainty of 0.57 WFC pixel, or 0.028″. This is within 1 WFC pixel, to the southwest, of a candidate source detected in all three ACS bands. The site of PTF12os lies approximately 2.2″ southeast of the position of the Type II SN 2004dg in this same host galaxy. Preliminary photometry of the ACS images using Dolphot (Dolphin 2000, PASP, 112, 1383) results in a brightness for the object of B=23.30, V=23.04, and I=22.53 (uncertainties are all 0.012 mag or smaller). Assuming the average value of the distance modulus to the host, NGC 5608, from the NASA/IPAC Extragalactic Database (NED), 32.01 mag, and also assuming only the Galactic foreground extinction at V-band from Schlegel, Finkbeiner, & Davis (1998, ApJ, 500, 525), 0.17 mag, this object had V absolute magnitude of -9.1 and absolute colors (B-V)_0=0.21 and (V-I)_0=0.44 (consistent with an early F spectral type). This could be a highly-luminous supergiant star, or, alternatively, a compact star cluster. Evidence exists from the strength of the Na I D lines in follow-up spectra (ATel 3881) that the extinction to the SN could, in fact, be higher, implying that the source is even more luminous and bluer. We tentatively identify this source as a candidate for the progenitor, although given the offset of the SN position from the object’s centroid, the host galaxy distance, and the inferred higher extinction, it is quite possible that the progenitor has not been detected. Higher-resolution imaging is pending for candidate confirmation, and further analysis is ongoing. Credential Certification: Assaf Horesh (assafh@astro.caltech.edu)

Subjects: Millimeter, Supernovae We report a CARMA observation of the type IIb supernova PTF12os (Arcavi et al.; ATEL# 3881). The observation was undertaken on 2012 Jan 14.65 UT. We report a null-detection in the 3-mm band (at a center frequency of 93 GHz) with a 3 sigma upper limit of 0.36 mJy/beam. We thank the CARMA staff for scheduling this target of opportunity. Pubblicazione della scoperta.

Central Bureau for Astronomical TelegramsINTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A.e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVA 2012P IN NGC 5806 = PSN J14595904+0153251 Alessandro Dimai, Cortina d’Ampezzo, Italy, on behalf of the Italian Supernovae Search Project (ISSP), reports the discovery by Fabio Briganti (Santa Croce sull’Arno, Pisa, Italy) of an apparent supernova (mag about 15.0) on unfiltered CCD images (limiting mag about 16.5) taken with the “Maioni” 0.28-m telescope of the Osservatorio Astronomico del Col Druscie at Cortina d’Ampezzo, Italy, on Jan. 22.1556 UT. The new object is located at R.A. = 14h59m59s.12, Decl. = +1d53’24″.4 (equinox 2000.0), which is 10″ west and 1″ south of the nucleus of NGC 5806. Nothing is visible at this position on Palomar Sky Survey infrared, red, and blue plates. The discovery image is posted at website URL http://tinyurl.com/7lzoeyv. The variable was designated PSN J14595904+0153251 when it was posted at the Central Bureau’s TOCP webpage and is here designated SN 2012P based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012P (unfiltered unless noted otherwise): 2011 Dec. 7, [18.0 (ISSP); 2012 Jan. 23.227, 15.2 (Briganti); 23.549, 16.3 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera + luminance filter at the New Mexico Skies Observatory near Mayhill, NM, U.S.A.; position end figures 59s.09, 24″.1; image posted at URL http://www.flickr.com/photos/43846774@N02/6752536997/). The type-II supernova 2004dg also appeared in NGC 5806 (cf. IAUC 8375). L. Borsato and V. Nascimbeni, Dipartimento di Fisica e Astronomia, Universita di Padova; and S. Benetti, A. Pastorello, S. Valenti, L. Tomasella, E. Cappellaro, P. Ochner, and M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that a spectrum (range 360-810 nm; resolution 2.2 nm) of PSN J14595904+0153251 = SN 2012P was obtained on Jan. 23.17 UT with the Ekar-Copernico 1.82-m telescope (+ AFOSC). Using a library of supernova spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available via https://gelato.tng.iac.es/login.cgi), they found a best match with typical type-Ib/c supernovae soon after maximum if a redshift of z = 0.004533 (Falco et al. 1999, PASP 111, 438; via NED) is assumed. From the minimum of a deep-intense absorption measured at 627.6 nm, an expansion velocity of about 5100 km/s is deduced for the ejecta if identified with Si II 635.5-nm (but an expansion velocity of about 14400 km/s if identified with H-alpha).NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2012 CBAT 2012 January 25 (CBET 2993) Daniel W. E. Green.

Scoperta Supernova nella galassie NGC 7485

Da poco più di un mese dall’inizio attività dell’osservatorio astronomico di Montecatini val di Cecina Pisa con i primi telescopi, abbiamo la prima scoperta! Durante la sessione di ricerca Supernovae all’interno del programma ISSP, Italian Supernovae Search Project, è stata scoperta una Supernova nella galassia NGC 7485. Gli scopritori della Supernova sono, Fabio Martinelli, Riccardo Mancini e Fabio Briganti. L’immagine ottenuta con il telescopio da 35cm, C14 su montatura Bellincioni Beta, con camera DTA company di Cascina Pisa con sensore Kodak KAF1000. Ripresa la notte del 13/10/2011

presenta la stella esplosa nella galassia di magnitudine 17.0.

Dopo una seconda immagine di conferma, l’avvenuta segnalazione all’ IAU, Iternational Astronomical Union.

http://www.cbat.eps.harvard.edu/unconf/followups/J23060280+3406367.html

PSN J23060280+3406367 Una grande soddisfazione da parte dello staff dell’osservatorio astronomico di Montecatini val di Cecina, in quanto i lavori dell’osservatorio non sono ancora terminati, e abbiamo già una scoperta all’attivo! Ringraziamento in particolare ai titolari del Podere Palareta per aver dato il terreno, e l’amministrazione comunale di Montecatini val di Cecina per i permessi della costruzione dell’osservatorio. A. Dimai, Cortina d’Ampezzo, Italy, reports the discovery by Fabio Martinelli, Riccardo Mancini and Fabio Briganti, on behalf of Italian Supernovae Search Project, of an apparent supernova (see PSN J23060280+3406367), on unfiltered CCD images taken with the 0.35-m telescope of the Montecatini Valdicecina Observatory (Pisa – Italy) on October 14.0299 (at mag about 18.0; limiting mag about 19.0) and 14.9319 UT (mag about 17.6; limiting mag about 19.0). The new object is located at R.A. = 23h06m02s.80, Decl. = +34°06’36″.7 (equinox 2000.0), which is 22″ west and 8″ north of the nucleus of NGC 7485. ISSP images of the same field taken on 2011 Oct. 01 (limiting mag about 19.5) shows nothing at this position, nor do Palomar Sky Survey infrared, red, and blue plates. A confirmation image, taken by A. Dimai with the “Maioni” 0.28 m. telescope of the Col Drusciè Observatory on October 15.9, shows the PSN at mag. +17.0 C. Best Regards Alessandro Dimai Montecatini val di Cecina Astronomical association.

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