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A narrow, edge-on disk resolved around HD 106906 with SPHERE
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Number of Authors: 42
2016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 586, L8Article in journal (Refereed) Published
Abstract [en]

Context. HD 106906AB is the only young binary system so far around which a planet has been imaged and a debris disk has been shown to exist, thanks to a strong IR excess. As such, it represents a unique opportunity for studying the dynamics of young planetary systems. Aims. We aim at further investigating the close (tens of au scales) environment of the HD 106906AB system. Methods. We used the extreme adaptive-optics-fed, high-contrast imager SPHERE that has recently been installed on the VLT to observe HD 106906. Both the IRDIS imager and the Integral Field Spectrometer were used. Results. We discovered a highly inclined, ring-like disk at a distance of 65 au from the star. The disk shows a strong brightness asymmetry with respect to its semi-major axis. It shows a smooth outer edge, compatible with ejection of small grains by the stellar radiation pressure. We show furthermore that the planet's projected position is significantly above the PA of the disk. Given the determined disk inclination, it is not excluded, however, that the planet could still orbit within the disk plane if at a large separation (2000 3000 au). We identified several additional point sources in the SPHERE /IRDIS field of view that appear to be background objects. We compare this system with other debris disks sharing similarities, and we briefly discuss the present results in the framework of dynamical evolution.

Place, publisher, year, edition, pages
2016. Vol. 586, L8
Keyword [en]
techniques: high angular resolution, stars: individual: HD 106906, planetary systems
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-128197DOI: 10.1051/0004-6361/201527264ISI: 000369715900011OAI: diva2:913998
Available from: 2016-03-23 Created: 2016-03-21 Last updated: 2016-03-23Bibliographically approved

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Janson, Markus
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Department of Astronomy
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