Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

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Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

Post by Edasich on 5th December 2013, 4:58 am

Luhman 16 = WISE J104915.57-531906.1

Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57-531906.1

Using FORS2 on the Very Large Telescope, we have astrometrically monitored over a period of two months the two components of the brown dwarf system WISE J104915.57-531906.1, the closest one to the Sun. Our astrometric measurements - with a relative precision at the milli-arcsecond scale - allow us to detect the orbital motion and derive more precisely the parallax of the system, leading to a distance of 2.020+/-0.019 pc. The relative orbital motion of the two objects is found to be perturbed, which leads us to suspect the presence of a substellar companion around one of the two components. We also perform VRIz photometry of both components and compare with models. We confirm the flux reversal of the T dwarf.
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Re: Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

Post by Led_Zep on 16th December 2013, 2:27 pm

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Luhman 16 (WISE J104915.57-531906.1)

Post by Sirius_Alpha on 29th January 2014, 3:10 pm

ESO VLT Doppler mapping of the secondary.
http://www.eso.org/public/news/eso1404/

Do we not have a thread for this object already?


Last edited by Sirius_Alpha on 29th January 2014, 6:57 pm; edited 1 time in total

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Re: Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

Post by Led_Zep on 29th January 2014, 3:13 pm

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Re: Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

Post by Lazarus on 29th June 2015, 12:52 am

Sahlmann & Lazorenko "Mass ratio of the 2 pc binary brown dwarf LUH16 and limits on planetary companions from astrometry"
http://arxiv.org/abs/1506.07994

We thus excluded that either of the LUH16 components harbours a giant planet more massive than twice the mass of Jupiter in a short period (20300 d) orbit, which disagrees with the conclusions of Boffin et al. (2014). So far, the system appears to consist of only two components.
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Re: Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

Post by Sirius_Alpha on 5th May 2016, 8:49 pm

Maps of Evolving Cloud Structures in Luhman 16AB from HST Time-Resolved Spectroscopy
http://arxiv.org/abs/1605.01682

WISE J104915.57-531906.1 is the nearest brown dwarf binary to our Solar system, consisting of two brown dwarfs in the L/T transition: Luhman 16A & B. In this paper we present the first map of Luhman 16A, and maps of Luhman 16B for two epochs. Our maps were created by applying Aeolus, a Markov-Chain Monte Carlo code that maps the top-of-the-atmosphere structure of brown dwarf and other ultracool atmospheres, to light curves of Luhman 16A & B using the Hubble Space Telescope's G141 and G102 grisms. Aeolus retrieved three or four spots in the top-of-the-atmosphere of Luhman 16A & B, with a surface coverage of 19%-32% (depending on an assumed rotational period of 5 hr or 8 hr) or 21%-38.5% (depending on the observational epoch) respectively. The brightness temperature of the spots of the best-fit models was ~200 K hotter than the background top-of-the-atmosphere. We compared our Luhman 16B map with the only previously published map. Interestingly, our map contained a large, cooler (DT~51 K) than the background top-of-the-atmosphere spot that lay at low latitudes, in agreement with the previous Luhman 16B map. Finally, we report the detection of a feature reappearing in Luhman 16B light curves that are separated by tens of hundreds of rotations from each other. We speculate this feature is related to top-of-the-atmosphere structures of Luhman 16B.

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Re: Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

Post by Sirius_Alpha on 4th June 2017, 8:31 pm

Hubble Space Telescope astrometry of the closest brown dwarf binary system -- I. Overview and improved orbit
https://arxiv.org/abs/1706.00657

Located at ~2pc, the L7.5+T0.5 dwarfs system WISE J104915.57-531906.1 (Luhman16AB) is the third closest system known to Earth, making it a key benchmark for detailed investigation of brown dwarf atmospheric properties, thermal evolution, multiplicity, and planet-hosting frequency. In the first study of this series -- based on a multi-cycle Hubble Space Telescope (HST) program -- we provide an overview of the project and present improved estimates of positions, proper motions, annual parallax, mass ratio, and the current best assessment of the orbital parameters of the A-B pair. Our HST observations encompass the apparent periastron of the binary at 220.5+/-0.2 mas at epoch 2016.402. Although our data seem to be inconsistent with recent ground-based astrometric measurements, we also exclude the presence of third bodies down to Neptune masses and periods longer than a year.

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Re: Luhman 16 (WISE J104915.57-531906.1) : Nearest BD System

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