Cataclysmic variables (CVs) of binary star systems consist of a small white object and a corresponding ordinary star. They rise abnormally to light with a significant factor, then retreat to a quiet place. Polar is a subset of the volatile variables distinguished from other CVs by the presence of a powerful magnetic field in its white particles.

Now, a team of astronomers led by Antonio C. Rodriguez of Caltech has discovered two new polar bears, the names ZTFJ0850 + 0443 and ZTFJ0926 + 0105. The discovery is the result of cutting through the catalog of the eROSITA Final Equatorial Depth Survey (eFEDS) and mandatory photometry of the ZTF Data Release 5 (DR5).

“We found two polars: ZTFJ0850 + 0443 and ZTFJ0926 + 0105, in combination with the eFEDS database and ZTF archive photometry,” the researchers wrote in a paper.

According to research, ZTFJ0850 + 0443 is a dwarf polar with an orbital period of 1.72 hours, at a distance of 3,260 light-years from Earth. Its white dwarf has a mass of about 0.81 mass solar, while its companion star is estimated to be about 0.12 mass solar. The results suggest that ZTFJ0850 + 0443 is probably polar with a low magnetic field of less than 10 mg.

At approximately 1,200 light-years, ZTFJ0926 + 0105 is a static polar with an orbital period of about 1.48 hours. It has the most common magnetic field for cooler climates — at least 26 mg. As ZTFJ0926 + 0105 did not cover the Sun, the team was unable to measure the size of the white dwarf.

Astronomers have concluded that their discovery demonstrates the value of eFEDS research in supplementing ZTF to discover new mutations. In addition, they added that by using Gaia’s ESA satellite, it would be possible to detect precise polarization. The latest Gaia Data Release 3 (DR3), published June 13, may be very helpful in this context.

“Schwope et al. (2021) detected eclipsing polar using eROSITA / SRG crossmatch and Gaia using an owner’s eRASS data set,” the scientists.

The research conducted by Rodriguez’s team is part of more significant analysis of follow-up eFEDS / ZTF. Such studies may help overcome visual bias in previous searches for catastrophic dynamics and can lead directly to accurate CV volume-restricted CV research.

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Alice is the Chief Editor with relevant experience of three years, Alice has founded Galaxy Reporters. She has a keen interest in the field of science. She is the pillar behind the in-depth coverages of Science news. She has written several papers and high-level documentation.


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