Speaker
Mr
Khunagorn Chanthorn
(School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)
Description
We followed up the new eclipsing white dwarf main sequence SDSS J102102.25+174439.9 with a short orbital period of 0.14 days from the Sloan Digital Sky Survey The system has been observed by using on the 2.4m telescope at the Thai National Observatory (TNO) with ULTRASPEC instrument. Our multi-band observations shows peculiar dips about 15 minute after the primary eclipse. Such dips in WDMS systems were only observed on one occasion of the light curve of QS Vir earlier. The dips in SDSS J1021+1744 are unique because they present in different wavelengths at approximately the same phase. It is possible that these dips are caused by the ejected materials from an active companion star, such as in QS Vir. The light curve in g′ filter exhibits deep and narrow features, implying that the materials which pass in front of the white dwarf in SDSS J1021+1744 must be dense and small in size. Furthermore, the stellar and orbital parameters SDSS J1021+1744 are presented.
Author
Mr
Khunagorn Chanthorn
(School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)
Co-authors
Dr
Nuanwan Sanguansak
(School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)
Dr
Puji Irawati
(National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand)
Prof.
Tom Marsh
(University of Warwick, Conventry CV4 7AL, United Kingdom)
Prof.
Vik Dhillon
(University of Sheffield, Sheffield S3 7RH, United Kingdom)
