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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  <identifier identifierType="DOI">10.5281/zenodo.4548117</identifier>
      <creatorName>Simon C. Ringqvist</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="">0000-0001-6377-8272</nameIdentifier>
      <affiliation>Stockholm University, Department of Astronomy,</affiliation>
      <creatorName>Rubén Asensio Torres</creatorName>
      <creatorName>Markus Janson</creatorName>
      <creatorName>Yuhiko Aoyama</creatorName>
      <creatorName>Gabriel-Dominique Marleau</creatorName>
      <creatorName>Mickael Bonnefoy</creatorName>
      <creatorName>Simon Petrus</creatorName>
    <title>Strong H-alpha emission and signs of accretion in a circumbinary planetary mass companion from MUSE</title>
    <subject>Young stars</subject>
    <subject>Very low mass stars</subject>
    <date dateType="Issued">2021-02-18</date>
  <resourceType resourceTypeGeneral="Text">Poster</resourceType>
    <alternateIdentifier alternateIdentifierType="url"></alternateIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsDerivedFrom" resourceTypeGeneral="JournalArticle">10.1051/0004-6361/202038131</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.4548116</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf"></relatedIdentifier>
    <rights rightsURI="">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
    <description descriptionType="Abstract">&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;</description>
    <description descriptionType="Other">NB. Last name change from Eriksson to Ringqvist in February 2021.</description>
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