Poster Open Access

Strong H-alpha emission and signs of accretion in a circumbinary planetary mass companion from MUSE

Simon C. Ringqvist; Rubén Asensio Torres; Markus Janson; Yuhiko Aoyama; Gabriel-Dominique Marleau; Mickael Bonnefoy; Simon Petrus


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    <subfield code="a">&lt;p&gt;With the recent addition of the Narrow Field Mode (NFM), the Multi Unit Spectroscopic Explorer (MUSE) integral-field spectrograph on VLT UT4 now offers an AO-corrected field of view of 7.5&amp;#39;&amp;#39; x 7.5&amp;#39;&amp;#39; with a mean resolution of 3000 at 480-930 nm. Using MUSE in NFM we have observed 2MASS J01033563-5515561 (AB) b (Delorme 1 (AB) b), a 47 pc distant 12-14 MJup&amp;nbsp;object orbiting a pair of young M5 stars at 84 AU (Eriksson et al. 2020). Observations covered 2.5 hours and obtained a near-visual spectrum&amp;nbsp;(4750-9350 &amp;Aring;) of this hot, young planet/brown dwarf, in addition to resolving both components of the 0.25&amp;rsquo;&amp;rsquo;&amp;nbsp;binary (Fig. 1).&lt;/p&gt;

&lt;p&gt;Here we present some highlights from our analysis of Delorme 1 (AB) b in&amp;nbsp;Eriksson et al. (2020,&amp;nbsp;A&amp;amp;A 638, L6).&amp;nbsp;The most interesting one being very strong H𝛼&amp;nbsp;emission, 17 times the local continuum with a mean equivalent width of -138+-13 &amp;Aring;, accompanied by H𝛽&amp;nbsp;and weaker He I lines. Together, these lines provide a strong indication that Delorme 1 (AB) b could be actively accreting, possibly putting it at tension with its estimated age of 30-45 Myr, or hinting at the presence of an unusually old disk.&lt;/p&gt;</subfield>
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