spectro-aras.com

ATEL #10387 ATEL
#10387

Title: ASAS-SN Discovery of A Likely Galactic Nova ASASSN-17gk on
the Rise
Author: K. Z. Stanek, C. S. Kochanek (OSU), L. Chomiuk, J. Strader
(MSU), J. S. Brown, T. W.-S. Holoien, J. V. Shields, T. A.
Thompson
(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), J. Brimacombe (Coral Towers
Observatory)
Queries: stanek.32@osu.edu
Posted: 18 May 2017; 00:49 UT
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 very bright, new transient source, most likely a
classical nova, near the Galactic plane

Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg)
Disc. UT Date Disc. V mag
ASASSN-17gk 13:20:55.32 -63:42:18.5 306.187 -1.02
2017-05-17.28 10.9

ASASSN-17gk was discovered in images obtained on 2017-05-17.28 at V~10.9,
but it has been present in ASAS-SN data since 2017-04-25.08 (V~13.3), with
significant shorter-timescale variability (V~11.6 on
2017-04-28.11 and V~12.05 on 2017-05-04.19). We do not detect (V>17.4)

this object in subtracted images taken on UT 2017-04-23.16 and before. No
previous outbursts are detected at this location since ASAS-SN started
observing it in February 2016.

Follow-up observations, especially multi-band photometry and spectroscopy,
are strongly encouraged.

We thank Las Cumbres Observatory and its staff for their continued support
of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore
Foundation through grant GBMF5490 to the Ohio State University, NSF grant
AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology
and AstroParticle Physics (CCAPP) at OSU, and the

Chinese Academy of Sciences South America Center for Astronomy (CASSACA).



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Spectra are welcome!

François

Confirmed (instrument response corrected version coming later). The next week's forecast for me is rain, hopefully others can follow up in the coming days.

Paul

Paul,
Well done!
Great result.....
We're still under cloud over here.
Ken

Here's the instrument and atmosphere corrected profile.

Paul

That's excellent, Paul!
Typical spectrum of a classical nova near maximum

Congratulations,

François

Paul's spectra are in the database
http://www.astrosurf.com/aras/Aras_Data ... en2017.htm

François

congratulation Paul !

Emissions brightening steadily over the past 5 nights (click to enlarge).

Paul

Great spectra Paul, you are very lucky to have a nova in south hemisphere (the last one very bright in the north was Nova del 2013) !!!!

Thanks Olivier and Etienne,

The challenge with this nova is the stormy weather (it's winter in Australia). I've had to open the hatch of my observatory a little bit to take some spectra when the clouds clear, and then be prepared to close up quickly before the next shower. It keeps me on my toes.

Paul