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Title: Gemini Planet Imager observations of the AU Microscopii debris disk: Asymmetries within one arcsecond

We present Gemini Planet Imager (GPI) observations of AU Microscopii, a young M dwarf with an edge-on, dusty debris disk. Integral field spectroscopy and broadband imaging polarimetry were obtained during the commissioning of GPI. In our broadband imaging polarimetry observations, we detect the disk only in total intensity and find asymmetries in the morphology of the disk between the southeast (SE) and northwest (NW) sides. The SE side of the disk exhibits a bump at 1'' (10 AU projected separation) that is three times more vertically extended and three times fainter in peak surface brightness than the NW side at similar separations. This part of the disk is also vertically offset by 69 ± 30 mas to the northeast at 1'' when compared to the established disk midplane and is consistent with prior Atacama Large Millimeter/submillimeter Array and Hubble Space Telescope/Space Telescope Imaging Spectrograph observations. We see hints that the SE bump might be a result of detecting a horizontal sliver feature above the main disk that could be the disk backside. Alternatively, when including the morphology of the NW side, where the disk midplane is offset in the opposite direction ~50 mas between 0farcs4 and 1farcs2, the asymmetries suggestmore » a warp-like feature. Using our integral field spectroscopy data to search for planets, we are 50% complete for ~4 MJup planets at 4 AU. Lastly, we detect a source, resolved only along the disk plane, that could either be a candidate planetary mass companion or a compact clump in the disk.« less
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ;  [6] ;  [7] ;  [2] ;  [1] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [12] ;  [13] ;  [14] more »;  [7] ;  [7] ;  [15] ;  [12] ;  [16] ;  [12] ;  [17] ;  [8] ;  [18] ;  [10] ;  [10] ;  [19] ;  [20] ;  [6] ;  [2] ;  [6] ;  [7] ;  [7] ;  [7] ;  [2] ;  [2] ;  [16] ;  [6] ;  [21] ;  [14] « less
  1. Univ. of California, Berkeley, CA (United States)
  2. Space Telescope Science Institute, Baltimore, MD (United States)
  3. SETI Institute, Mountain View, CA (United States); Stanford Univ., Stanford, CA (United States)
  4. Univ. of Toronto,Toronto, ON (Canada)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Arizona State Univ., Tempe, AZ (United States)
  7. Gemini Observatory, La Serena (Chile)
  8. Univ. of Toronto, Toronto, ON (Canada)
  9. Univ. de Montreal, Montreal, QC (Canada)
  10. Univ. of Victoria, Victoria, BC (Canada); National Research Council of Canada Herzberg, Victoria, BC (Canada)
  11. Univ. of California, Berkeley, CA (United States); Univ. Grenoble Alpes/CNRS, Grenoble (France)
  12. Univ. of California, Los Angeles, CA (United States)
  13. Gemini Observatory, La Serena (Chile); Durham Univ., Durham (United Kingdom)
  14. Space Telescope Science Institute, Baltimore, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  15. Univ. of Exeter, Exeter (United Kingdom)
  16. Large Synoptic Survey Telescope, Tucson, AZ (United States)
  17. Stanford Univ., Stanford, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  18. SETI Institute, Mountain View, CA (United States)
  19. Univ. of Arizona, Tucson, AZ (United States)
  20. American Museum of Natural History, New York, NY (United States)
  21. Univ. of California, Santa Cruz, CA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2041-8213
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 811; Journal Issue: 2; Journal ID: ISSN 2041-8213
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS circumstellar matter; instrumentation: adaptive optics; methods: data analysis; planet-disk interactions; stars: individual (AU Mic); techniques: high angular resolution