Papers › MKT J170456.2-482100: the first transient discovered by MeerKAT
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
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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-$482100 is variable in the radio, reaching a maximum flux density of 0.71±0.11 mJy on 2019 Oct 12, and is undetected in 15 out of 48 ThunderKAT epochs. MKT J170456.2$-$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 21.25±0.04 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$-$482100, which may indicate that TYC 8332-2529-1 has large star spots. Spectroscopic analysis shows that TYC 8332-2529-1 is in a binary, and has a line-of-sight radial velocity amplitude of 43 km s⁻¹. We also observe a spectral feature in anti-phase with the K-type sub-giant, with a line-of-sight radial velocity amplitude of ∼12±10 km s⁻¹, whose origins cannot currently be explained. Further observations and investigation are required to determine the nature of the MKT J170456.2$-$482100 system.
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