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arXiv · 1705.06378

First millimeter detection of the disk around a young, isolated, planetary-mass object

Amelia Bayo·Viki Joergens·Yao Liu·Robert Brauer·Johan Olofsson·Javier Arancibia·Paola Pinilla·Sebastian Wolf·Jan Philipp Ruge·Thomas Henning·Antonella Natta·Katharine G. Johnston·Mickael Bonnefoy·Henrik Beuther·Gael Chauvin
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Abstract

OTS44 is one of only four free-floating planets known to have a disk. We have previously shown that it is the coolest and least massive known free-floating planet ($\sim$12 M$_{\rm Jup}$) with a substantial disk that is actively accreting. We have obtained Band 6 (233 GHz) ALMA continuum data of this very young disk-bearing object. The data shows a clear unresolved detection of the source. We obtained disk-mass estimates via empirical correlations derived for young, higher-mass, central (substellar) objects. The range of values obtained are between 0.07 and 0.63 M$_{\oplus}$ (dust masses). We compare the properties of this unique disk with those recently reported around higher-mass (brown dwarfs) young objects in order to infer constraints on its mechanism of formation. While extreme assumptions on dust temperature yield disk-mass values that could slightly diverge from the general trends found for more massive brown dwarfs, a range of sensible values provide disk masses compatible with a unique scaling relation between $M_{\rm dust}$ and $M_{*}$ through the substellar domain down to planetary masses.

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Amelia Bayo, Viki Joergens, Yao Liu, Robert Brauer, Johan Olofsson, Javier Arancibia, Paola Pinilla, Sebastian Wolf, Jan Philipp Ruge, Thomas Henning, Antonella Natta, Katharine G. Johnston, Mickael Bonnefoy, Henrik Beuther, Gael Chauvin. 2017-05-18. First millimeter detection of the disk around a young, isolated, planetary-mass object. https://doi.org/10.3847/2041-8213/aa7046

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