BRINGING "tHE MOTH" to LIGHT: A PLANET-SCULPTING SCENARIO for the HD 61005 DEBRIS DISK

Thomas M. Esposito, Michael P. Fitzgerald, James R. Graham, Paul Kalas, Eve J. Lee, Eugene Chiang, Gaspard Duchene, Jason Wang, Maxwell A. Millar-Blanchaer, Eric Nielsen, S. Mark Ammons, Sebastian Bruzzone, Robert J.De Rosa, Zachary H. Draper, Bruce Macintosh, Franck Marchis, Stanimir A. Metchev, Marshall Perrin, Laurent Pueyo, Abhijith RajanFredrik T. Rantakyrö, David Vega, Schuyler Wolff

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The HD 61005 debris disk ("The Moth") stands out from the growing collection of spatially resolved circumstellar disks by virtue of its unusual swept-back morphology, brightness asymmetries, and dust ring offset. Despite several suggestions for the physical mechanisms creating these features, no definitive answer has been found. In this work, we demonstrate the plausibility of a scenario in which the disk material is shaped dynamically by an eccentric, inclined planet. We present new Keck NIRC2 scattered-light angular differential imaging of the disk at 1.2-2.3 μm that further constrains its outer morphology (projected separations of 27-135 au). We also present complementary Gemini Planet Imager 1.6 μm total intensity and polarized light detections that probe down to projected separations less than 10 au. To test our planet-sculpting hypothesis, we employed secular perturbation theory to construct parent body and dust distributions that informed scattered-light models. We found that this method produced models with morphological and photometric features similar to those seen in the data, supporting the premise of a planet-perturbed disk. Briefly, our results indicate a disk parent body population with a semimajor axis of 40-52 au and an interior planet with an eccentricity of at least 0.2. Many permutations of planet mass and semimajor axis are allowed, ranging from an Earth mass at 35 au to a Jupiter mass at 5 au.

Original languageEnglish (US)
Article number85
JournalAstronomical Journal
Volume152
Issue number4
DOIs
StatePublished - Oct 2016
Externally publishedYes

Keywords

  • infrared: planetary systems
  • planetdisk interactions
  • stars: individual (HD 61005)
  • techniques: high angular resolution
  • techniques: polarimetric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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