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Revista mexicana de astronomía y astrofísica

Print version ISSN 0185-1101


PARIKH, A. S.; HERNANDEZ SANTISTEBAN, J. V.; WIJNANDS, R.  and  PAGE, D.. Multiwavelength observations of MASTER OT 075353.88+174907.6: a likely superoutburst of a long period dwarf nova system. Rev. mex. astron. astrofis [online]. 2019, vol.55, n.1, pp.55-63. ISSN 0185-1101.

MASTER OT 075353.88+174907.6 was a blue optical transient reported by the MASTER-Net project on 2017 Oct 31. We carried out multiwavelength follow-up observations of this source during its 2017 outburst using Swift and RATIR. The source was found to be 4.4 mag above its quiescent level during the peak of the outburst and the outburst lasted 19 days. Our observations suggest that it was a superoutburst of a long period U Geminorum type dwarf nova system. The spectral energy distribution during the initial slow decay phase of the outburst was consistent with a disk-dominated spectrum (with spectral indices Γ≈1.5-2.3). Afterwards, the UV flux decreased slowlier than the optical and the spectral energy distribution was very steep with indices Γ ≈3.7±0.7. This slow UV decay may be the emission from a cooling white dwarf heated during the outburst. No X-ray emission was detected from the source since it is likely located at a large distance >2.3 kpc.

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