Details

Autor(en) / Beteiligte

• Lawson, Kellen
• Currie, Thayne
• Wisniewski, John P.
• Tamura, Motohide
• Schneider, Glenn
• Augereau, Jean-Charles
• Brandt, Timothy D.
• Guyon, Olivier
• Kasdin, N. Jeremy
• Groff, Tyler D.
• Lozi, Julien
• Chilcote, Jeffrey
• Hodapp, Klaus
• Jovanovic, Nemanja
• Martinache, Frantz
• Skaf, Nour
• Akiyama, Eiji
• Henning, Thomas
• Knapp, Gillian R.
• Kwon, Jungmi
• Mayama, Satoshi
• McElwain, Michael W.
• Sitko, Michael L.
• Asensio-Torres, Ruben
• Uyama, Taichi
• Wagner, Kevin

Titel

SCExAO/CHARIS Near-infrared Integral Field Spectroscopy of the HD 15115 Debris Disk

Ist Teil von

• The Astronomical journal, 2020-10, Vol.160 (4), p.163

Ort / Verlag

Goddard Space Flight Center: The American Astronomical Society

Erscheinungsjahr

2020

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• We present new, near-infrared (1.1-2.4 m) high-contrast imaging of the debris disk around HD 15115 with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system coupled with the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS). The SCExAO/CHARIS resolves the disk down to ∼ 0 2 (rproj ∼ 10 au), a factor of ∼3-5 smaller than previous recent studies. We derive a disk position angle of PA ∼ 279 4-280 5 and an inclination of i ∼ 85 3-86.2 . While recent SPHERE/IRDIS imagery of the system could suggest a significantly misaligned two-ring disk geometry, CHARIS imagery does not reveal conclusive evidence for this hypothesis. Moreover, optimizing models of both one- and two-ring geometries using differential evolution, we find that a single ring having a Hong-like scattering phase function matches the data equally well within the CHARIS field of view ( 1″). The disk's asymmetry, well evidenced at larger separations, is also recovered; the west side of the disk appears, on average, around 0.4 mag brighter across the CHARIS bandpass between 0 25 and 1″. Comparing Space Telescope Imaging Spectrograph (STIS) 50CCD optical photometry (2000-10500 ) with CHARIS near-infrared photometry, we find a red (STIS/50CCD−CHARIS broadband) color for both sides of the disk throughout the 0 4-1″ region of overlap, in contrast to the blue color reported at similar wavelengths for regions exterior to ∼2″. Further, this color may suggest a smaller minimum grain size than previously estimated at larger separations. Finally, we provide constraints on planetary companions and discuss possible mechanisms for the observed inner disk flux asymmetry and color.