Polarimetric monitoring of the MAXI J1820+070 in optical and near-infrared wavelengths

ATel #11855; Yamanaka, M., Nakaoka, T., Kawabata, M., Takagi, K., Sasada, M., and Takahashi, H. (Hiroshima University)
on 15 Jul 2018; 07:06 UT
Credential Certification: Masayuki Yamanaka (masyamanaka@hiroshima-u.ac.jp)

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We have performed the imaging polarimetric monitoring observations of MAXIJ1820+070 in optical and near-infrared wavelengths using the Hiroshima Optical and Near-InfraRed camera (HONIR; Akitaya et al. 2014) attached to the 1.5-m Kanata telescope at the Higashi-Hiroshima Observatory (HHO) on Jun 24.7, Jun 25.7 and Jul 11.6. We measured the degrees of polarization (PD) of 0.7+/-0.1 (%), 0.9+/-0.2 (%), and 0.9+/-0.3 (%) on Jun 24.7, Jun 25.7 and Jul 11.6 in the R band, respectively. These are consistent with those presented These PD are consistent with those presented in the previous reports (ATel #11445). We also measured the near-infrared PD of ~0.9 on Jul 11.6 in the Ks band. We roughly estimated the polarization angle in the range of -10 -- -20 degree in the R band. These results indicate that the PD did not significantly change before/after the state transition around the beginning of July 2018 (ATEL #11820).