Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

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Michel Verlinden
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Joined: Tue Aug 16, 2016 12:11 am

Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

Post by Michel Verlinden »

ASAS-SN Discovery of A Likely Galactic Nova ASASSN-16ma on the Rise

ATel #9669; K. Z. Stanek, C. S. Kochanek, J. S. Brown, T. W.-S. Holoien, J. Shields (OSU), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), L. Chomiuk, J. Strader (MSU), J. Brimacombe (Coral Towers Observatory)
on 26 Oct 2016; 01:28 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Nova

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in CTIO, Chile, we detect a new transient source, most likely a classical nova, near the Galactic center


Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg) Disc. UT Date Disc. V mag
ASASSN-16ma 18:20:52.12 -28:22:13.52 4.288 -6.468 2016-10-25.02 13.7
ASASSN-16ma was discovered in images obtained on 2016-10-25.02 at V~13.7 and proceed to brighten to V~11.6 a day later (UT 2016-10-26.02). We do not detect (V>17.3) the object in images taken on UT 2016-10-20.04 and before. No previous outbursts are detected at this location since ASAS-SN started observing the Galactic center in March 2016.

JD
Observation Date V mag V err
2016-10-20.04 >17.3 --
2016-10-25.02 13.7 0.02
2016-10-26.02 11.6 0.01
Follow-up observations, especially multi-band photometry and spectroscopy, are strongly encouraged.
Francois Teyssier
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Re: Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

Post by Francois Teyssier »

Confirmed by a spectrum obtained by Paul Luckas:

Aras data base : http://www.astrosurf.com/aras/Aras_Data ... r2016d.htm

ATel : http://www.astronomerstelegram.org/?read=9678

Spectroscopic confirmation of ASASSN-16ma as a classical nova in the Fe-curtain stage

ATel #9678; Paul Luckas (International Centre for Radio Astronomy Research, Univ. of Western Australia; ARAS Group)
on 27 Oct 2016; 15:02 UT

Credential Certification: S. N. Shore (shore@df.unipi.it)

We report the results of low resolution spectroscopy (Alpy600+Atik414 CCD, R ~ 540) of the nova candidate ASASSN-16ma (ATel #9669). The spectra were obtained on 2016 Oct 27.5 UT with a resolution of about 530 and covering ~3800-7200A and S/N of about 100) with a total exposure of 3600 sec. (see ATel #9658 for details) The spectra was typical of the optically thick stage of the expansion. Neither He I nor other CNO lines were present (this is not the fireball), the Na I D doublet displayed only absorption (likely interstellar), were in absorption. The Balmer series was in emission through Hdelta with little evidence for any P Cyg absorption, with a low maximum radial velocity (HWZI) of -750+/-50 km/s on Halpha and Hbeta, (possible weak absorption on Hgamma, or perhaps blending). There is, however, a broader weak extended wing on Halpha (at about 5% of the continuum and only a few percent of the peak intensity) that extends to nearly 1050 km/s. Several lines showed moderately strong P Cyg profiles, notably Fe II 4923, 5018, and (weaker) 5169 A; Si II 6347, 6371 A; no forbidden or intercombination transitions were present. The metallic lines were typically 10-15 percent of the continuum. Observations are continuing.



Image

Congratulations to Paul Luckas!

François Teyssier
Michel Verlinden
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Re: Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

Post by Michel Verlinden »

Chapeau, Paul ! Et merci à François d'avoir relayé l'analyse du spectre obtenu !
Paul Luckas
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Re: Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

Post by Paul Luckas »

etienne bertrand
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Re: Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

Post by etienne bertrand »

Bien joué et Bravo !
Robin Leadbeater
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Re: Outburst (>6 Mag) of a likely Galactic Nova ASASSN-16ma

Post by Robin Leadbeater »

Not sure if this has been mentioned elsewhere already but congratulations to Paul Luckas who is named as co-author in a paper in Nature on this superluminous nova.
"A Nova outburst powered by shocks"
https://www.nature.com/articles/s41550-017-0222-1

As mentioned in this week's Sky and Telescope newsletter
http://www.skyandtelescope.com/astronom ... light-nova

Robin
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http://www.threehillsobservatory.co.uk
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