Utilizing the Gemini North telescope, astronomers have carried out spectroscopic observations of a binary system referred to as SDSS J222551.65+001637.7AB. Outcomes of the observational marketing campaign point out that the system consists of a white dwarf and a brown dwarf companion. The discovering was reported December 21 on the arXiv pre-print server.
SDSS J222551.65+001637.7AB is a binary system situated some 711 light years away from the Earth. It was first recognized in 2006 as binary composed of a hydrogen-rich white dwarf and a much less huge stellar or substellar companion. More moderen observations of SDSS J222551.65+001637.7AB have discovered that the white dwarf has an efficient temperature of almost 11,000 Ok and that the separation between the 2 objects will not be bigger than 350 AU.
On condition that little or no was recognized concerning the companion to the white dwarf on this system, a staff of astronomers led by Jenni R. French of the College of Leicester, U.Ok., noticed the binary with the cross-dispersed spectrograph GNIRS on Gemini North. The spectroscopic observations had been carried out in July 2020 as part of the GN-2020A-Q-322 program.
“Spectra had been taken utilizing the quick blue digicam with the 32 l/mm grating and a slit width of 1.0 arcsec, giving a decision of (λ / Δλ) ∼ 500 throughout your entire wavelength vary of 0.8–2.5 µm,” the researchers defined.
The observations discovered that SDSS J222551.65+001637.7AB is a large, comoving white dwarf–brown dwarf binary. The 2 elements of the system are separated from one another by about 207 AU. This makes SDSS J222551.65+001637.7AB the eighth confirmed huge comoving white dwarf–brown dwarf binary and likewise the third closest separated resolved system of this kind after GD 165AB and PHL 5038AB.
In response to the research, the white dwarf, designated SDSS J222551.65+001637.7A, has a mass of about 0.66 solar masses and its effective temperature is 10,926 Ok. The brown dwarf SDSS J222551.65+001637.7B was discovered to be of spectral sort L4 and its mass is estimated to be between 25 and 53 Jupiter lots.
The age of the system was estimated to be almost two billion years and its minimal orbital interval was calculated to be 3,560 years. The researchers suppose that because of the huge separation, it’s unlikely that the brown dwarf altered the first progenitor’s evolution.
“For the reason that preliminary separation of SDSS J222551.65+001637.7AB is just too huge to be a post-common envelope system, it should have advanced in another way to shut white dwarf–brown dwarf binaries. The 2 elements can have advanced individually, and the brown dwarf won’t have truncated the white dwarf’s evolution,” the authors of the paper concluded.
Extra data:
Jenni R. French et al, Discovery of a resolved white dwarf-brown dwarf binary with a small projected separation: SDSS J222551.65+001637.7AB, arXiv (2023). DOI: 10.48550/arxiv.2301.02101
Journal data:
arXiv
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SDSS J222551.65+001637.7AB is a white dwarf–brown dwarf binary system, observations discover (2023, January 16)
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