Third Nearest WZ Sge-Type Dwarf Nova candidate ASASSN-14dx Classified on the Basis of Gaia Data Release 2

Abstract

ASASSN-14dx showed an extraordinary outburst whose features are the small outburst amplitude (~ 2.3 mag) and long duration (> 4 years). Because we found a long observational gap of 123 d before the outburst detection, we propose that the main outburst plateau was missed and that this outburst is just a "fading tail" often seen after the WZ Sge-type superoutbursts. In order to distinguish between WZ Sge and SU UMa-type dwarf novae (DNe), we investigated Gaia DR2 statistically. We applied a logistic regression model and succeeded in classifying by using absolute Gaia magnitudes $M_G$ and Gaia colors $G_{\mathrm{BP}}-G_{\mathrm{RP}}$. Our new classifier also suggests that ASASSN-14dx is the best candidate of a WZ Sge-type DN. We estimated distances from the earth of known WZ Sge stars by using Gaia DR2 parallaxes. The result indicates that ASASSN-14dx is the third nearest WZ Sge star (next to WZ Sge and V455 And), and hence the object can show the third brightest WZ Sge-type superoutburst whose maximum is $V$ = 8-9 mag.

arXiv comment16 pages, 4 figures, accepted for publication in PASJ, http://www.kusastro.kyoto-u.ac.jp/~isogai/ASASSN-14dx/

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Cited by in corpus (1)

• First Detection of Two Superoutbursts during Rebrightening Phase of a WZ Sge-type Dwarf Nova: TCP J21040470+4631129