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SCExAO/CHARIS Near-...
SCExAO/CHARIS Near-infrared Integral Field Spectroscopy of the HD 15115 Debris Disk
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-09-11
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American Astronomical Society,2020
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LIBRIS-ID:oai:DiVA.org:su-186139
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-186139URI
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https://doi.org/10.3847/1538-3881/ababa6DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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We present new, near-infrared (1.1-2.4 mu 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 rho similar to 02 (r(proj) similar to 10 au), a factor of similar to 3-5 smaller than previous recent studies. We derive a disk position angle of PA similar to 2794-2805 and an inclination ofi similar to 853-86.2. 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 (rho less than or similar to 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 025 and 1 ''. Comparing Space Telescope Imaging Spectrograph (STIS) 50CCD optical photometry (2000-10500 A) with CHARIS near-infrared photometry, we find a red (STIS/50CCD-CHARIS broadband) color for both sides of the disk throughout the 04-1 '' region of overlap, in contrast to the blue color reported at similar wavelengths for regions exterior to similar 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.
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Currie, Thayne
(author)
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Wisniewski, John P.
(author)
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Tamura, Motohide
(author)
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Schneider, Glenn
(author)
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Augereau, Jean-Charles
(author)
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Brandt, Timothy D.
(author)
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Guyon, Olivier
(author)
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Kasdin, N. Jeremy
(author)
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Groff, Tyler D.
(author)
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Lozi, Julien
(author)
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Chilcote, Jeffrey
(author)
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Hodapp, Klaus
(author)
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Jovanovic, Nemanja
(author)
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Martinache, Frantz
(author)
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Skaf, Nour
(author)
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Akiyama, Eiji
(author)
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Henning, Thomas
(author)
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Knapp, Gillian R.
(author)
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Kwon, Jungmi
(author)
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Mayama, Satoshi
(author)
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McElwain, Michael W.
(author)
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Sitko, Michael L.
(author)
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Asensio-Torres, RubenStockholms universitet,Institutionen för astronomi(Swepub:su)rasen
(author)
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Uyama, Taichi
(author)
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Wagner, Kevin
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astronomical Journal: American Astronomical Society160:40004-62561538-3881
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Lawson, Kellen
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Currie, Thayne
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Wisniewski, John ...
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Tamura, Motohide
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Schneider, Glenn
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Augereau, Jean-C ...
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Brandt, Timothy ...
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Guyon, Olivier
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Kasdin, N. Jerem ...
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Groff, Tyler D.
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Lozi, Julien
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Chilcote, Jeffre ...
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Hodapp, Klaus
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Jovanovic, Neman ...
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Martinache, Fran ...
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Skaf, Nour
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Akiyama, Eiji
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Henning, Thomas
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Knapp, Gillian R ...
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Kwon, Jungmi
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Mayama, Satoshi
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McElwain, Michae ...
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Sitko, Michael L ...
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Asensio-Torres, ...
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Uyama, Taichi
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Wagner, Kevin
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