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MKT J170456.2-482100: the first transient discovered by MeerKAT | | L. N. Driessen
; I. McDonald
; D. A. H. Buckley
; M. Caleb
; E. J. Kotze
; S. B. Potter
; K .M. Rajwade
; A. Rowlinson
; B. W. Stappers
; E. Tremou
; P. A. Woudt
; R. P. Fender
; R. Armstrong
; P. Groot
; I. Heywood
; A. Horesh
; A. J. van der Horst
; E. Koerding
; V. A. McBride
; J. C. A. Miller-Jones
; K. P. Mooley
; R. A. M. J. Wijers
; | | Date: |
18 Nov 2019 | | Abstract: | We report the discovery of the first transient with MeerKAT, MKT
J170456.2$-$482100, discovered in ThunderKAT images of the low mass X-ray
binary GX339$-$4. MKT J170456.2$-$482100 is variable in the radio, reaching a
maximum flux density of $0.71pm0.11,mathrm{mJy}$ on 2019 Oct 12, and is
undetected in 15 out of 48 ThunderKAT epochs. MKT J170456.2$-$482100 is
coincident with the chromospherically active K-type sub-giant TYC 8332-2529-1,
and $sim18,mathrm{years}$ of archival optical photometry of the star shows
that it varies with a period of $21.25pm0.04,mathrm{days}$. The shape and
phase of the optical light curve changes over time, and we detect both X-ray
and UV emission at the position of MKT J170456.2$-$482100, which may indicate
that TYC 8332-2529-1 has large star spots. Spectroscopic analysis shows that
TYC 8332-2529-1 is in a binary, and has a line-of-sight radial velocity
amplitude of $43,mathrm{km,s^{-1}}$. We also observe a spectral feature in
anti-phase with the K-type sub-giant, with a line-of-sight radial velocity
amplitude of $sim12pm10,mathrm{km,s^{-1}}$, whose origins cannot currently
be explained. Further observations and investigation are required to determine
the nature of the MKT J170456.2$-$482100 system. | | Source: | arXiv, 1911.7713 | | Services: | Forum | Review | PDF | Favorites | |
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