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These multi-object systems can provide information about the formation of low-mass companions in wide orbits and\/or help us to speculate about possible migration scenarios. Accurate classification of companions is crucial for testing formation pathways.<\/jats:p>\n<jats:p><jats:italic>Aims.<\/jats:italic> In this work we further characterise the recently discovered candidate for a planetary-mass companion CS Cha b and determine if it is still accreting.<\/jats:p>\n<jats:p><jats:italic>Methods.<\/jats:italic> MUSE is a four-laser-adaptive-optics-assisted medium-resolution integral-field spectrograph in the optical part of the spectrum. We observed the CS Cha system to obtain the first spectrum of CS Cha b. The companion is characterised by modelling both the spectrum from 6300 \u00c5 to 9300 \u00c5 and the photometry using archival data from the visible to the near-infrared (NIR).<\/jats:p>\n<jats:p><jats:italic>Results.<\/jats:italic> We find evidence of accretion and outflow signatures in H<jats:italic>\u03b1<\/jats:italic> and OI emission. The atmospheric models with the highest likelihood indicate an effective temperature of 3450\u2005\u00b1\u200550 K with a log <jats:italic>g<\/jats:italic> of 3.6\u2005\u00b1\u20050.5 dex. Based on evolutionary models, we find that the majority of the object is obscured. We determine the mass of the faint companion with several methods to be between 0.07 <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub> and 0.71 <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub> with an accretion rate of <jats:italic>\u1e40<\/jats:italic> = 4 \u00d7 10<jats:sup>\u221211\u00b10.4<\/jats:sup> <jats:italic>M<\/jats:italic><jats:sub>\u2299<\/jats:sub> yr<jats:sup>\u22121<\/jats:sup>.<\/jats:p>\n<jats:p><jats:italic>Conclusions.<\/jats:italic> Our results show that CS Cha B is most likely a mid-M-type star that is obscured by a highly inclined disc, which has led to its previous classification using broadband NIR photometry as a planetary-mass companion. This shows that it is important and necessary to observe over a broad spectral range to constrain the nature of faint companions.<\/jats:p>","DOI":"10.1051\/0004-6361\/202038706","type":"journal-article","created":{"date-parts":[[2020,7,16]],"date-time":"2020-07-16T07:50:43Z","timestamp":1594885843000},"page":"L12","source":"Crossref","is-referenced-by-count":11,"title":["CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion"],"prefix":"10.1051","volume":"640","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5130-9153","authenticated-orcid":false,"given":"S. Y.","family":"Haffert","sequence":"first","affiliation":[]},{"given":"R. G.","family":"van Holstein","sequence":"additional","affiliation":[]},{"given":"C.","family":"Ginski","sequence":"additional","affiliation":[]},{"given":"J.","family":"Brinchmann","sequence":"additional","affiliation":[]},{"given":"I. A. 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