Utilizing NASA’s Transiting Exoplanet Survey Satellite tv for pc (TESS), a world group of astronomers has detected a brand new heat brown dwarf. The newfound object, designated HIP 33609 b, transits a vivid and quickly rotating star. The invention was introduced in a paper printed January 23 on the arXiv pre-print repository.
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). Though many brown dwarfs have been detected thus far, such objects orbiting different stars are a uncommon discover.
Not too long ago, a bunch of astronomers led by Noah Vowell of the Michigan State College, has discovered a brand new object of this uncommon sort. The report {that a} transit sign has been recognized within the mild curve of a B-star generally known as HIP 33609. Comply with-up spectroscopic and photometric observations confirmed that the transiting object is a big, huge and heat brown dwarf.
“On this paper, we current the invention of a benchmark transiting BD within the HIP 33609 system. We use a mixture of spectroscopic and photometric observations from each ground- and space-based amenities with the intention to characterize the host star and transiting BD,” the researchers defined.
The newly discovered brown dwarf is inflated as its radius is about 58% bigger than Jupiter, whereas its mass is estimated to be some 68 Jupiter lots. The observations present that the orbit of HIP 33609 b is extremely eccentric, with an eccentricity of 0.56, and the orbital period was measured to be 39.47 days. The brown dwarf’s equilibrium temperature was discovered to be 1,237 Okay.
The star HIP 33609 has a radius of about 1.86 solar radii and is 2.38 occasions extra huge than the sun. It’s a quick rotator as its rotation period was measured to be roughly 55.6 km/s. The star’s efficient temperature is about 10,400 Okay.
The astronomers famous the weird parameters of HIP 33609 b, particularly its lengthy orbital interval, may assist advance our information of transiting companions round sizzling stars. Due to this fact, HIP 33609 b is perceived as a benchmark for substellar evolutionary fashions. They added that every one beforehand found transiting companions round B- and A-type stars have orbital periods lower than 10 days.
“The HIP 33609 system is a perfect candidate for testing substellar evolutionary fashions, in addition to for a comparative evaluation relative to the in depth inhabitants of extremely irradiated, brief interval BDs and giant planets,” the authors of the paper wrote.
Moreover, the observations carried out by Vowell’s group resulted in a younger stellar affiliation (estimated to be about 150 million years outdated), which acquired designation MELANGE-6. It seems that HIP 33609 is a member of this affiliation.
Extra data:
Noah Vowell et al, HIP 33609 b: An Eccentric Brown Dwarf Transiting a V=7.3 Quickly Rotating B-Star, arXiv (2023). DOI: 10.48550/arxiv.2301.09663
Journal data:
arXiv
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