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We present a multiwavelength study of the Be/X-ray binary system XTEJ1946+274 with the main goal of better characterizing its behavior during X-rayquiescence. We aim to shed light on the mechanism which triggers the X-rayactivity for this source. XTE J1946+274 was observed by Chandra-ACIS duringquiescence in 2013 March 12. In addition, this source has been monitored fromthe ground-based astronomical observatories of El Teide (Tenerife, Spain),Roque de los Muchachos (La Palma, Spain) and Sierra Nevada (Granada, Spain)since 2011 September, and from the TUBITAK National Observatory (Antalya,Turkey) since 2005 April. We have performed spectral and photometric temporalanalyses in order to investigate the quiescent state and transient behavior ofthis binary system. In 2006, a long mass ejection event took place from the Bestar, lasting for about seven years. We also found that a large Becircumstellar disk was present during quiescence, although major X-ray activitywas not observed. We made an attempt to explain this scenario by assuming thepermanently presence of a tilted and warped Be circumstellar disk. The 0.3-10keV X-ray spectrum during quiescence was well fitted with either an absorbedblackbody or absorbed power-law models. The main parameters obtained for thesemodels were kT=1.43+/-0.17 and Gamma=0.9+/-0.4 (with N_H~2-7E+22 cm-2). The0.3-10 keV flux of the source was ~0.8E-12 erg-1 cm-2 s-1. Pulsations werefound with P_pulse=15.757(1) s (MJD 56363.115) and an rms pulse fraction of32.1(3)%. The observed X-ray luminosity during quiescent periods may beexplained by the neutron star being in supersonic propeller regimen.

Detection of a large Be circumstellar disk during X-ray quiescence of XTE J1946+274