Analysis of the Near-Substellar Brown Dwarf TOI-6285b
Description
Here we present results from TOI-6285b, a transiting brown dwarf (BD) orbiting a young A-type main sequence star. We used a global fit to derive the parameters of the host star, BD, and system as a whole. We found that the BD has a mass of MBD = 87.0+2.2 M and a radius of R = 0.790+0.028 R . The host star has a mass of M = −2.1 J BD −0.022 J ∗ 1.809+0.068 M , a radius of R = 1.899+0.058 R , and an effective surface temperature of −0.067 ⊙ ∗ −0.038 ⊙ T = 7340+200 K. From these parameters and the MIST model we calculate a stellar eff −210 age of 540+180 Myr. We derive an orbital period P = 6.85813 ± 0.00001 days and an −140 BD eccentricity 0.0032+0.0024, suggesting a close orbit that may have been circularized. The −0.0020 BD lies far enough above the substellar transition point to be in an ambiguous position between very massive BDs and ultra low-mass stars, while its radius is extremely low for the age of the system. These characteristics raise interesting questions about the formation mechanism of TOI-6285b and the potential implications on the formation of similar objects in general.
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Astro 98
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Additional details
Dates
- Submitted
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2023-12-11
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