Bright nova in Centaurus

Information about outbursts of eruptive stars, Be activity, ...
Francois Teyssier
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Bright nova in Centaurus

Post by Francois Teyssier »

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).



************************************************************************************************

Spectra are welcome!

François
Paul Luckas
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Location: Perth, Western Australia

Re: Bright nova in Centaurus

Post by Paul Luckas »

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
_asassn-17gk_20170518_428_Paul Luckas.png
_asassn-17gk_20170518_428_Paul Luckas.png (5.53 KiB) Viewed 8166 times
Ken Harrison
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Re: Bright nova in Centaurus

Post by Ken Harrison »

Paul,
Well done!
Great result.....
We're still under cloud over here.
Ken
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before....
"Imaging Sunlight - Using a digital Spectroheliograph" - Springer
http://www.astronomicalspectroscopy.com
Paul Luckas
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Joined: Tue Jun 24, 2014 5:08 pm
Location: Perth, Western Australia

Re: Bright nova in Centaurus

Post by Paul Luckas »

Here's the instrument and atmosphere corrected profile.

Paul
_asassn-17gk_20170518_428_Paul Luckas.png
_asassn-17gk_20170518_428_Paul Luckas.png (6.28 KiB) Viewed 8159 times
Francois Teyssier
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Re: Bright nova in Centaurus

Post by Francois Teyssier »

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

Congratulations,

François
Francois Teyssier
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Joined: Fri Sep 23, 2011 1:01 pm
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Re: Bright nova in Centaurus

Post by Francois Teyssier »

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

François
etienne bertrand
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Re: Bright nova in Centaurus

Post by etienne bertrand »

congratulation Paul !
Paul Luckas
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Location: Perth, Western Australia

Re: Bright nova in Centaurus

Post by Paul Luckas »

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

Paul
Chart1.png
Chart2.png
Chart2.png (26.09 KiB) Viewed 8073 times
Olivier GARDE
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Re: Bright nova in Centaurus

Post by Olivier GARDE »

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) !!!!
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Paul Luckas
Posts: 101
Joined: Tue Jun 24, 2014 5:08 pm
Location: Perth, Western Australia

Re: Bright nova in Centaurus

Post by Paul Luckas »

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
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