MKT J170456.2-482100: the first transient discovered by MeerKAT
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 \(0.71\pm0.11\,\mathrm{mJy}\) on 2019 Oct 12, and is...
Saved in:
Published in | arXiv.org |
---|---|
Main Authors | , , , , , , , , , , , , , , , , , , , , , |
Format | Paper Journal Article |
Language | English |
Published |
Ithaca
Cornell University Library, arXiv.org
18.11.2019
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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 \(0.71\pm0.11\,\mathrm{mJy}\) 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 \(21.25\pm0.04\,\mathrm{days}\). 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 \(\sim12\pm10\,\mathrm{km\,s^{-1}}\), whose origins cannot currently be explained. Further observations and investigation are required to determine the nature of the MKT J170456.2\(-\)482100 system. |
---|---|
ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.1911.07713 |