From kentagch@kusastro.kyoto-u.ac.jp Tue Feb 21 02:41:36 2023
From: Kenta TAGUCHI <kentagch@kusastro.kyoto-u.ac.jp>
To: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 27439] Spectrum of TCP J06442271+1549388
Date: Tue, 21 Feb 2023 11:41:29 +0900
Message-ID: <56d71fb4-d696-b756-e1c0-cf198faba7fa@kusastro.kyoto-u.ac.jp>
In-Reply-To: <E1pUHOI-0007Fq-RJ@ori.kusastro.kyoto-u.ac.jp>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="===============8820190179583624345=="

--===============8820190179583624345==
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable

Spectrum of TCP J17562787-1714

We reported optical spectrum of TCP J17562787-1714 to ATel #15911 and=20
classify it as a He/N-type nova:
https://www.astronomerstelegram.org/?read=3D15911

Best,
Kenta


On 2023/02/21 10:24, Taichi Kato wrote:
> TCP J17562787-1714548 (ATEL 15910)
>
>> It is somewhat unusual for a nova to show shock-powered X-rays
>> visible to Swift/XRT less than two days after eruption. This may
>> suggest that the transient is a very fast nova and/or a nova
>> embedded in the wind of an evolved donor star.
>     Possibly a nova that erupted in symbiotic environment.
>
> =3D=3D=3D
>
> ATEL #15910                                                          ATEL #=
15910
>
> Title:  Swift/XRT detection of the nova candidate TCP J17562787-1714548
> Author: Kirill Sokolovsky (UIUC), Kim Page (U. Leicester), Elias Aydi,
>                  Laura Chomiuk, Jay Strader (MSU), Jennifer Sokoloski (Colu=
mbia),
>   Justin
>                  Linford (NRAO), Koji Mukai (NASA/GSFC)
> Queries:kirx(a)kirx.net
> Posted: 21 Feb 2023; 01:02 UT
> Subjects:Ultra-Violet, X-ray, Nova, Transient
>
> The candidate nova TCP J17562787-1714548 was discovered by
> Y. Sakurai, H. Nishimura, and A. Pearce using DSLR camera images
> with the first reported detection on 2022-02-18.834 UT at
> an unfiltered magnitude of 11. Follow-up astrometry by multiple
> observers reported via CBAT Transient Object Followup Reports page
> suggests Gaia DR3 4144602552564272000 (G=3D18.1, Plx=3D0.20+/-0.18 mas)
> as a possible progenitor that shows irregular variability
> in archival ZTF and ATLAS photometry (T. Kato, vsnet-alert 27432).
>
> Swift observed TCP J17562787-1714548 for 1.9ks on 2023-02-20.58.
> Swift/XRT detected an X-ray source with a net count rate
> of 0.043 +/-0.006 cts/s at the position of the transient.
> Most of the counts are above 3 keV, consistent with
> heavily absorbed (n_H > 10^23 cm^-2) thermal emission
> with kT > 1 keV. The Galactic absorbing column density in
> the direction of the source is n_H =3D 3.86x10^21 cm^-2
> (Kalberla et al. 2005 A&A, 440, 775), suggesting the presence of
> source-intrinsic absorption. The XRT detection cannot be attributed
> to optical loading that should manifest itself as spurious
> soft (rather than hard) emission. Swift/UVOT detected
> a UVW1=3D 12.35 +/-0.02 (Vega system) ultraviolet source at
> the position of the transient.
>
> It is somewhat unusual for a nova to show shock-powered X-rays
> visible to Swift/XRT less than two days after eruption. This may
> suggest that the transient is a very fast nova and/or a nova
> embedded in the wind of an evolved donor star.
>
> We thank the Neil Gehrels Swift Observatory team and PI,
> Brad Cenko, for rapid execution this ToO observation.
>
> <a href=3D"https://ztf.snad.space/dr13/view/332207100098232">ZTF photometry
> of the possible progenitor</a>
>
> CBAT Transient Object Followup Reports page:http://www.cbat.eps.harvard.edu=
/unc
> onf/followups/J17562787-1714548.html
--=20
________________________________________________________________
 =C2=A0=E7=94=B0=E5=8F=A3 =E5=81=A5=E5=A4=AA=E3=80=80(TAGUCHI, Kenta)
 =C2=A0=E4=BA=AC=E9=83=BD=E5=A4=A7=E5=AD=A6=E5=A4=A7=E5=AD=A6=E9=99=A2=E7=90=
=86=E5=AD=A6=E7=A0=94=E7=A9=B6=E7=A7=91=E5=AE=87=E5=AE=99=E7=89=A9=E7=90=86=
=E5=AD=A6=E6=95=99=E5=AE=A4
 =C2=A0(Department of Astronomy, Graduate School of Science, Kyoto University)
kentagch(a)kusastro.kyoto-u.ac.jp
 =C2=A009090536980

--===============8820190179583624345==--