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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    "description": "<p>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&#39;&#39; x 7.5&#39;&#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&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&nbsp;(4750-9350 &Aring;) of this hot, young planet/brown dwarf, in addition to resolving both components of the 0.25&rsquo;&rsquo;&nbsp;binary (Fig. 1).</p>\n\n<p>Here we present some highlights from our analysis of Delorme 1 (AB) b in&nbsp;Eriksson et al. (2020,&nbsp;A&amp;A 638, L6).&nbsp;The most interesting one being very strong H\ud835\udefc&nbsp;emission, 17 times the local continuum with a mean equivalent width of -138+-13 &Aring;, accompanied by H\ud835\udefd&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.</p>", 
    "language": "eng", 
    "title": "Strong H-alpha emission and signs of accretion in a circumbinary planetary mass companion from MUSE", 
    "license": {
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    "notes": "NB. Last name change from Eriksson to Ringqvist in February 2021.", 
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    "keywords": [
      "Circumbinary", 
      "Exoplanet", 
      "Accretion", 
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    "publication_date": "2021-02-18", 
    "creators": [
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        "affiliation": "Stockholm University, Department of Astronomy,", 
        "name": "Simon C. Ringqvist"
      }, 
      {
        "name": "Rub\u00e9n Asensio Torres"
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      {
        "name": "Markus Janson"
      }, 
      {
        "name": "Yuhiko Aoyama"
      }, 
      {
        "name": "Gabriel-Dominique Marleau"
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      {
        "name": "Mickael Bonnefoy"
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      {
        "name": "Simon Petrus"
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      "url": "http://coolstars20.cfa.harvard.edu/cs20half/index.html", 
      "dates": "March 2-4, 2021", 
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      "title": "The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun"
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