HD 284149 - Imaged sub-stellar companion

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A new sub-stellar companion around the young star HD 284149

Post by Stalker on 1st July 2014, 12:49 pm

A new sub-stellar companion around the young star HD 284149

Mariangela Bonavita, Sebastian Daemgen, Silvano Desidera, Ray Jayawardhana, Markus Janson, David Lafreniere wrote:Even though only a handful of sub-stellar companions have been found via direct imaging, each of these discoveries has had a tremendous impact on our understanding of the star formation process and the physics of cool atmospheres. Young stars are prime targets for direct imaging searches for planets and brown dwarfs, due to the favorable brightness contrast expected at such ages and also because it is often possible to derive relatively good age estimates for these primaries. Here we present the direct imaging discovery of HD 284149 b, a 18-50 M_Jup companion at a projected separation of 400 AU from a young (25 Myr) F8 star, with which it shares common proper motion

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Re: HD 284149 - Imaged sub-stellar companion

Post by Edasich on 1st July 2014, 3:27 pm

Something well above 25 Jupiter masses boundary at average estimation. Lower range falls within high-mass planetary domain though.

Yet it is listed in EPE:

http://exoplanet.eu/catalog/hd_284149/
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HD 284149 - Imaged sub-stellar companion

Post by Sirius_Alpha on 31st July 2014, 3:46 am

A new sub-stellar companion around the young star HD 284149
http://arxiv.org/abs/1406.7298

Even though only a handful of sub-stellar companions have been found via direct imaging, each of these discoveries has had a tremendous impact on our understanding of the star formation process and the physics of cool atmospheres. Young stars are prime targets for direct imaging searches for planets and brown dwarfs, due to the favorable brightness contrast expected at such ages and also because it is often possible to derive relatively good age estimates for these primaries. Here we present the direct imaging discovery of HD 284149 b, a 18-50 M_Jup companion at a projected separation of 400 AU from a young (25 Myr) F8 star, with which it shares common proper motion

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Re: HD 284149 - Imaged sub-stellar companion

Post by Sirius_Alpha on 23rd July 2017, 8:19 pm

Looks like HD 284149 b is actually the circumbinary planet HD 284149 (AB)b

Orbiting a binary: SPHERE characterisation of the HD 284149 system
https://arxiv.org/abs/1707.06238

In this paper we present the results of the SPHERE observation of the HD 284149 system, aimed at a more detailed characterisation of both the primary and its brown dwarf companion. We observed HD 284149 in the near-infrared with SPHERE, using the imaging mode (IRDIS+IFS) and the long-slit spectroscopy mode (IRDIS-LSS). The data were reduced using the dedicated SPHERE pipeline, and algorithms such as PCA and TLOCI were applied to reduce the speckle pattern. The IFS images revealed a previously unknown low-mass (~0.16M⊙) stellar companion (HD 294149 B) at ~0.1′′, compatible with previously observed radial velocity differences, as well as proper motion differences between Gaia and Tycho-2 measurements. The known brown dwarf companion (HD 284149 b) is clearly visible in the IRDIS images. This allowed us to refine both its photometry and astrometry. The analysis of the medium resolution IRDIS long slit spectra also allowed a refinement of temperature and spectral type estimates. A full reassessment of the age and distance of the system was also performed, leading to more precise values of both mass and semi-major axis. As a result of this study, HD 284149 ABb therefore becomes the latest addition to the (short) list of brown dwarfs on wide circumbinary orbits, providing new evidence to support recent claims that object in such configuration occur with a similar frequency to wide companions to single stars.

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Re: HD 284149 - Imaged sub-stellar companion

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