Astronomers discover new eclipsing binary after common envelope stage

(ORDO NEWS) — Astronomers have made photometric and spectroscopic observations of a binary system known as TIC 60040774.

The results of the observational campaign have shed more light on the properties of this system, showing that it is a Post-Common Envelope Binary (PCEB) eclipsing binary. The study was published August 5 on

A team of astronomers led by Rom Priyatikanto of the National Research and Innovation Agency in Bandung, Indonesia, has explored TIC 60040774, one of the closest binary systems with a low-mass secondary star located 437 light-years away. Previous research has shown that it could be PCEB.

The team analyzed the light curve of TIC 60040774 using the Transiting Exoplanet Survey Satellite (TESS), multiband photometry from the SED Analyzer Virtual Observatory (VOSA), and spectroscopic data from the South African Large Telescope (SALT). They found that this system consists of a young white dwarf and an M-dwarf companion.

According to the study, the white dwarf in TIC 60040774 has a mass of about 0.6 solar masses and an effective temperature of 14,050 K.

The companion star has a spectral type of M6.5, a mass of about 0.11 solar masses, and an effective temperature of 2,759 K.

The orbital period of the system is estimated at 9.71 hours, relatively long compared to other known PCEBs. The total age of TIC 60040774 was about 1.024 billion years.

The researchers suggest that the system was at the stage of a common envelope about 243 million years ago.


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