Observations investigate properties of nearby brown dwarf HD 33632 Ab

Utilizing the Keck II telescope in Hawaii, astronomers have noticed a close-by brown dwarf often known as HD 33632 Ab. Outcomes of the observational marketing campaign, presented in a paper printed Could 14 on the pre-print server arXiv, present extra insights into the properties of this substellar object and its ambiance.

Brown dwarfs (BDs) are intermediate objects between planets and stars, occupying the mass vary between 13 and 80 Jupiter lots (0.012 and 0.076 solar masses). Provided that BDs have comparable temperatures and atmospheric properties to gas giant exoplanets, they’re extra large and brighter on the similar age, which permits astronomers to characterize their atmospheric properties extra simply.

At a distance of 86 mild years, HD 33632 Ab is a BD companion to the solar-mass star HD 33632 A, which is of spectral sort FV8. It has a subsolar metallicity and is estimated to be 1–2.5 billion years previous. The brown dwarf has a mass of about 46 Jupiter lots and is separated from its host by roughly 20 AU.

A workforce of astronomers led by Chih-Chun Hsu of Northwestern College in Evanston, Illinois, has employed the Keck Planet Imager and Characterizer (KPIC) to conduct high-resolution spectroscopy of this method.

“We current the Keck/KPIC high-resolution Ok-band spectroscopy of the benchmark brown dwarf mass companion HD 33632 Ab, which supplied companion radial and projected rotational velocities in addition to CO and H₂O abundances,” the researchers wrote.

The observations discovered that HD 33632 Ab has projected rotational and radial velocities of 53 and -8 km/s, respectively. The system’s orbital interval was measured to be about 74 years, and the orbital eccentricity was calculated to be 0.25.

The collected information point out that HD 33632 Ab is much less large and at a better distance to its host than beforehand thought. The mass of the brown dwarf was discovered to be some 37 Jupiter lots, whereas its separation from HD 33632 was estimated to be roughly 18 AU.

Primarily based on the KPIC spectra of HD 33632 Ab, the astronomers detected carbon monoxide and water vapor in its ambiance. Nonetheless, they didn’t discover any traces of methane, which might be as a consequence of a number of components, together with the quick rotation of the brown dwarf or the comparatively low signal-to-noise ratio of the obtained spectra.

The research discovered that HD 33632 Ab has a metallicity at a stage of 0.0 dex and a carbon to oxygen ratio of 0.58, which is mostly per the properties of the host star. The researchers famous that these outcomes are anticipated for BD companions shaped by way of gravitational core collapse or disk instability.

Summing up the outcomes, the authors of the paper underlined that the brand new outcomes for HD 33632 Ab may assist us advance our information concerning the formation and evolution of brown dwarfs typically; nonetheless, a bigger pattern of studied close-in BDs remains to be wanted with the intention to make important enhancements on this matter.

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