Nova ASASSN-17mt ?

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Francois Teyssier
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Nova ASASSN-17mt ?

Post by Francois Teyssier »

Nova in southern sky ?


The Astronomer's Telegram http://www.astronomerstelegram.org

==============================================================================
ATEL #10772 ATEL #10772

Title: ASAS-SN Discovery of a Possible Bright Galactic Nova ASASSN-17mt
Author: K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson
(OSU), L. Chomiuk, J. Strader (MSU), T. W.-S. Holoien, B. J. Shappee
(Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo
Dong (KIAA-PKU)
Queries: stanek.32@osu.edu
Posted: 24 Sep 2017; 18:50 UT
Subjects:Optical, Nova

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN,
<a href="http://adsabs.harvard.edu/%61bs/2014ApJ ... S">Shappee
et al. 2014</a>), using data from the quadruple 14-cm "Cassius"
telescope in CTIO, Chile, we detect a bright, new transient source,
possibly a classical nova (could also be a bright CV), near the
Galactic plane

Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg)
Disc. UT Date Disc. V mag
ASASSN-17mt 08:50:29.576 -47:45:28.56 267.191 -2.319
2017-09-24.39 11.3

ASASSN-17mt was discovered in images obtained on UT 2017-09-24.39
V~11.3, and it is also detected at UT 2017-09-23.40 at V~11.3. There
was an ~80-day seasonal gap before these observations, so the nova
candidate could have peaked already. We do not detect (V>16.9) this
object in subtracted images taken on UT 2017-07-07.95 and before.

Using <a href=https://asas-sn.osu.edu/>ASAS-SN Sky Patrol</a>
public all-sky light curve interface (<a
href=http://adsabs.harvard.edu/abs/2017PASP. ... K>Kochanek et
al. 2017)</A>, we have retrieved aperture photometry time series at
the location of ASASSN-17mt, and the resulting light curve can be seen

<a href=https://asas-sn.osu.edu/light_curves/9c ... 97>here</a>.

No previous outbursts or variability are detected at the position of
ASASSN-17mt since ASAS-SN started observing this location in February
2016.

Follow-up observations, especially 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). Happy Birthday to MtS.
Paul Luckas
Posts: 101
Joined: Tue Jun 24, 2014 5:08 pm
Location: Perth, Western Australia

Re: Nova ASASSN-17mt ?

Post by Paul Luckas »

Nova confirmed. A classical nova in the Fe Curtain stage. ATel courtesy of Steve here: http://www.astronomerstelegram.org/?read=10795

Paul
ASASSN-17mt_confirmation_Luckas.png
ASASSN-17mt_confirmation_Luckas.png (53.54 KiB) Viewed 4569 times
Last edited by Paul Luckas on Fri Oct 06, 2017 6:36 am, edited 2 times in total.
Olivier GARDE
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Re: Nova ASASSN-17mt ?

Post by Olivier GARDE »

Congratulation Paul for this confirmation and the Atel !!!
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
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Re: Nova ASASSN-17mt ?

Post by Francois Teyssier »

Félicitations, Paul !

The data base is updated with a new page:

http://www.astrosurf.com/aras/Aras_Data ... el2017.htm

21th nova

All the best,

François
Paul Luckas
Posts: 101
Joined: Tue Jun 24, 2014 5:08 pm
Location: Perth, Western Australia

Re: Nova ASASSN-17mt ?

Post by Paul Luckas »

A quick screen shot of ASASSN-17mt, taken a week after the confirmation spectra. Given this target's position low in the eastern sky before dawn, and the fact that 17mt is likely to be a slow developing classical nova, this will probably be the last spectrum (from me at least).

Paul
asassn-17mt_171008_PaulLuckas.png
asassn-17mt_171008_PaulLuckas.png (5.33 KiB) Viewed 4566 times
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