CFBDSIR J1458+1013 B - A Y-dwarf planet?

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CFBDSIR J1458+1013 B - A Y-dwarf planet?

Post by Edasich on 2nd March 2011, 9:51 am

CFBDSIR J1458+1013B: A Very Cold (>T10) Brown Dwarf in a Binary System

We have identified CFBDSIR J1458+10 as a 0.11" binary using Keck laser guide star AO imaging. We measure a parallactic distance of 23.1+/-2.4 pc to the system based on CFHT near-IR astrometry. We assign a spectral type of T9.5 to the integrated-light near-IR spectrum, and model atmospheres suggest a slightly higher temperature and surface gravity than the T10 dwarf UGPS J0722-05. Thus, CFBDSIR J1458+10AB is the coolest brown dwarf binary to date. Its secondary component has an absolute H-band magnitude that is 1.9+/-0.3 mag fainter than UGPS J0722-05, giving an inferred spectral type of >T10. The secondary's bolometric luminosity of ~2 x 10^{-7} L_sun makes it the least luminous known brown dwarf by a factor of 4-5. By comparing to models and known T9-T10 objects, we estimate a temperature of 370+/-40 K and a mass of 6-15 Mjup for CFBDSIR J1458+10B. At such extremes, atmospheric models predict the onset of novel photospheric processes, namely the appearance of water clouds and the removal of strong alkali lines. Our photometry shows that strong CH_4 absorption persists at H-band; the J-K color is bluer than the latest known T dwarfs but not as blue as predicted by current models; and the J-H color delineates a possible inflection in the blueward trend for the latest T dwarfs. Given its low luminosity, atypical colors and cold temperature, CFBDSIR J1458+10B is a promising candidate for the hypothesized Y spectral class. Regardless of its ultimate classification, CFBDSIR J1458+10AB provides a new benchmark for measuring the properties of brown dwarfs and gas-giant planets, testing substellar models, and constraining the low-mass limit for star formation.

Listed at EPE's Imaged Planets session

http://exoplanet.eu/star.php?st=CFBDS+1448

A good season for imaged very low-mass substellar objects.
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Re: CFBDSIR J1458+1013 B - A Y-dwarf planet?

Post by Lazarus on 3rd March 2011, 12:50 pm

Listed at EPE's Imaged Planets session

http://exoplanet.eu/star.php?st=CFBDS+1448
A brown dwarf with 24 solar masses?

And an orbital period of 40 days at 2.6 AU?

Wink
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Re: CFBDSIR J1458+1013 B - A Y-dwarf planet?

Post by Sirius_Alpha on 23rd March 2011, 1:05 pm


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Re: CFBDSIR J1458+1013 B - A Y-dwarf planet?

Post by atomic7732 on 23rd March 2011, 6:17 pm

The star doesn't seem to be at the link provided any longer.

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Re: CFBDSIR J1458+1013 B - A Y-dwarf planet?

Post by Lazarus on 23rd March 2011, 6:19 pm

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Re: CFBDSIR J1458+1013 B - A Y-dwarf planet?

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