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Title: AN M DWARF COMPANION AND ITS INDUCED SPIRAL ARMS IN THE HD 100453 PROTOPLANETARY DISK

Recent VLT/SPHERE near-infrared imaging observations revealed two spiral arms with a near m = 2 rotational symmetry in the protoplanetary disk around the ∼1.7 M{sub ⊙} Herbig star HD 100453. A ∼0.3 M{sub ⊙} M dwarf companion, HD 100453 B, was also identified at a projected separation of 120 AU from the primary. In this Letter, we carry out hydrodynamic and radiative transfer simulations to examine the scattered light morphology of the HD 100453 disk as perturbed by the companion on a circular and coplanar orbit. We find that the companion truncates the disk at ∼45 AU in scattered light images, and excites two spiral arms in the remaining (circumprimary) disk with a near m = 2 rotational symmetry. Both the truncated disk size and the morphology of the spirals are in excellent agreement with the SPHERE observations at Y, J, H, and K1-bands, suggesting that the M dwarf companion is indeed responsible for the observed double-spiral-arm pattern. Our model suggests that the disk is close to face on (inclination angle ∼5°), and that the entire disk-companion system rotates counterclockwise on the sky. The HD 100453 observations, along with our modeling work, demonstrate that double spiral arm patterns in near-infrared scattered light images can be generically produced by companions, and supportmore » future observations to identify the companions responsible for the arms observed in the MWC 758 and SAO 206462 systems.« less
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ;  [5]
  1. Nuclear Science Division, Lawrence Berkeley National Lab, Berkeley, CA 94720 (United States)
  2. Princeton University, Princeton, NJ 08544 (United States)
  3. Department of Astronomy, University of California at Berkeley, Berkeley, CA 94720 (United States)
  4. Institute for Advanced Study, Princeton, NJ 08540 (United States)
  5. Department of Astronomy/Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)
Publication Date:
OSTI Identifier:
22518643
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 816; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DWARF STARS; HERBIG-HARO OBJECTS; INCLINATION; MORPHOLOGY; ORBITS; PLANETS; PROTOPLANETS; RADIANT HEAT TRANSFER; SATELLITES; STAR EVOLUTION; SYMMETRY; VISIBLE RADIATION