Imaging discovery of a 400K companion to a nearby RV exoplanet host star (probably HD 4113)

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Imaging discovery of a 400K companion to a nearby RV exoplanet host star (probably HD 4113)

Post by Borislav on 21st August 2017, 11:20 am

https://physics.boisestate.edu/exoclipse/files/2017/07/Exoclipse_2017_Abstracts.pdf

Dr. Anthony Cheetham University of Geneva anthony.cheetham@unige.ch
Imaging discovery of a 400K companion to a nearby RV exoplanet host star

Using high-contrast imaging with the SPHERE instrument at the VLT, we report the detection of a brown dwarf companion to an exoplanet host star. The newly imaged brown dwarf is the coldest known companion to a solar-like star, with an effective temperature of 400K and a spectral type at the T/Y transition. By combining the imaging data with 17 years of radial velocity monitoring, we are able to precisely measure the dynamical mass, temperature, luminosity and orbital parameters of the brown dwarf, making it a crucial benchmark for formation and evolutionary models. The system is also a complex dynamical environment, with simulations showing that the brown dwarf may be interacting strongly with the exoplanet through Lidov-Kozai interactions, which could be the cause of the planet's extremely large orbital eccentricity (e~0.9).

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Re: Imaging discovery of a 400K companion to a nearby RV exoplanet host star (probably HD 4113)

Post by Borislav on 24th August 2017, 4:36 pm

It's really HD 4113. Even colder than was thought.

https://twitter.com/DMontesG/status/900452134209978368
The #exoclipse17 conference in Boise with A. Cheetham - DI SPHERE detection of HD 4113 C BD








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Re: Imaging discovery of a 400K companion to a nearby RV exoplanet host star (probably HD 4113)

Post by Sirius_Alpha on 14th December 2017, 9:26 pm

The paper is finally on arXiv.

Direct imaging of an ultracool substellar companion to the exoplanet host star HD 4113A
https://arxiv.org/abs/1712.05217

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Re: Imaging discovery of a 400K companion to a nearby RV exoplanet host star (probably HD 4113)

Post by Lazarus on 15th December 2017, 12:37 pm

Reading through that, sounds like there's a good possibility that HD 4113 C is a binary brown dwarf. Or perhaps something else is going on, e.g. another long-period object in the system.
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Re: Imaging discovery of a 400K companion to a nearby RV exoplanet host star (probably HD 4113)

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