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            <idno type="stamp" n="IRSTEA">IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (&lt;b&gt;anciennement Cemagref&lt;/b&gt;)</idno>
            <idno type="stamp" n="CNES">CNES - Centre national d'études spatiales</idno>
            <idno type="stamp" n="OSUG">Observatoire des Sciences de la Terre, de l'Univers et de l'Environnement de Grenoble</idno>
            <idno type="stamp" n="IPAG">Institut de Planétologie et d'Astrophysique de Grenoble</idno>
            <idno type="stamp" n="AGREENIUM">Archive ouverte en agrobiosciences</idno>
            <idno type="stamp" n="INRAE">Institut National de Recherche en Agriculture, Alimentation et Environnement</idno>
            <idno type="stamp" n="UGA-COMUE">Université Grenoble Alpes [2016-2019]</idno>
            <idno type="stamp" n="USMB-COMUE">Université Savoie Mont Blanc - UGA [* - 2019]</idno>
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                <title xml:lang="en">Spiral Structure and Differential Dust Size Distribution in the LKHα 330 Disk</title>
                <author role="aut">
                  <persName>
                    <forename type="first">Eiji</forename>
                    <surname>Akiyama</surname>
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                  <idno type="idhal" notation="numeric">797205</idno>
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                <author role="aut">
                  <persName>
                    <forename type="first">Jun</forename>
                    <surname>Hashimoto</surname>
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                <author role="aut">
                  <persName>
                    <forename type="first">Hauyu Baobab</forename>
                    <surname>Liu</surname>
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                  <idno type="halauthorid">1652799-0</idno>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Jennifer I-Hsiu</forename>
                    <surname>Li</surname>
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                  <idno type="halauthorid">1317197-0</idno>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Michael</forename>
                    <surname>Bonnefoy</surname>
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                  <persName>
                    <forename type="first">Yasuhiro</forename>
                    <surname>Hasegawa</surname>
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                <author role="aut">
                  <persName>
                    <forename type="first">Thomas</forename>
                    <surname>Henning</surname>
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                <author role="aut">
                  <persName>
                    <forename type="first">Michael L.</forename>
                    <surname>Sitko</surname>
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                <author role="aut">
                  <persName>
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                    <forename type="first">Markus</forename>
                    <surname>Feldt</surname>
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                  <email type="domain">mpia.de</email>
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                    <forename type="first">John</forename>
                    <surname>Wisniewski</surname>
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                    <forename type="first">Tomoyuki</forename>
                    <surname>Kudo</surname>
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                    <forename type="first">Nobuhiko</forename>
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                    <forename type="first">Takashi</forename>
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                  <persName>
                    <forename type="first">Munetake</forename>
                    <surname>Momose</surname>
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                  <idno type="idhal" notation="numeric">775856</idno>
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                <author role="aut">
                  <persName>
                    <forename type="first">Takayuki</forename>
                    <surname>Muto</surname>
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                    <forename type="first">Tetsuo</forename>
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                    <forename type="first">Mayama</forename>
                    <surname>Satoshi</surname>
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                <author role="aut">
                  <persName>
                    <forename type="first">Michihiro</forename>
                    <surname>Takami</surname>
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                  <persName>
                    <forename type="first">Nagayoshi</forename>
                    <surname>Ohashi</surname>
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                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Carol A.</forename>
                    <surname>Grady</surname>
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                  <persName>
                    <forename type="first">Jungmi</forename>
                    <surname>Kwon</surname>
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                    <forename type="first">Christian</forename>
                    <surname>Thalmann</surname>
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                  <idno type="idhal" notation="numeric">780388</idno>
                  <idno type="halauthorid" notation="string">1105386-780388</idno>
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                    <forename type="first">Lyu</forename>
                    <surname>Abe</surname>
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                  <email type="domain">optik.mtk.nao.ac.jp</email>
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                    <forename type="first">Wolfgang</forename>
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                    <forename type="first">Timothy D.</forename>
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                    <forename type="first">Miwa</forename>
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                    <forename type="first">Olivier</forename>
                    <surname>Guyon</surname>
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                  <email type="domain">noirlab.edu</email>
                  <idno type="idhal" notation="string">garima-singh</idno>
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                    <forename type="first">Yutaka</forename>
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                    <forename type="first">Saeko S.</forename>
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                    <forename type="first">Klaus W.</forename>
                    <surname>Hodapp</surname>
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                  <idno type="halauthorid">2520489-0</idno>
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                <author role="aut">
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                    <forename type="first">Miki</forename>
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                  <idno type="halauthorid">681000-0</idno>
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                <author role="aut">
                  <persName>
                    <forename type="first">Masanori</forename>
                    <surname>Iye</surname>
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                  <idno type="idhal" notation="numeric">767504</idno>
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                  <persName>
                    <forename type="first">Gillian R.</forename>
                    <surname>Knapp</surname>
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                    <forename type="first">Ryo</forename>
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                    <forename type="first">Taro</forename>
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                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Michael W.</forename>
                    <surname>Mcelwain</surname>
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                  <idno type="halauthorid">2115454-0</idno>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Shoken</forename>
                    <surname>Miyama</surname>
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                  <idno type="idhal" notation="numeric">791468</idno>
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                    <forename type="first">Jun-Ichi</forename>
                    <surname>Morino</surname>
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                    <surname>Moro-Martin</surname>
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                    <forename type="first">Tetsuo</forename>
                    <surname>Nishimura</surname>
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                <author role="aut">
                  <persName>
                    <forename type="first">Tae-Soo</forename>
                    <surname>Pyo</surname>
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                  <idno type="idhal" notation="numeric">760530</idno>
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                  <persName>
                    <forename type="first">Eugene</forename>
                    <surname>Serabyn</surname>
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                  <persName>
                    <forename type="first">Takuya</forename>
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                    <forename type="first">Hiroshi</forename>
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                    <forename type="first">Ryuji</forename>
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                  <persName>
                    <forename type="first">Yasuhiro H.</forename>
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                    <forename type="first">Naruhisa</forename>
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                <author role="aut">
                  <persName>
                    <forename type="first">Hiroshi</forename>
                    <surname>Terada</surname>
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                    <forename type="first">Daigo</forename>
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                <author role="aut">
                  <persName>
                    <forename type="first">Edwin L.</forename>
                    <surname>Turner</surname>
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                    <surname>Yamada</surname>
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                    <forename type="first">Hideki</forename>
                    <surname>Takami</surname>
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                    <forename type="first">Tomonori</forename>
                    <surname>Usuda</surname>
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                    <forename type="first">Motohide</forename>
                    <surname>Tamura</surname>
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                <idno type="halJournalId" status="VALID">19419</idno>
                <idno type="issn">0004-6256</idno>
                <idno type="eissn">1538-3881</idno>
                <title level="j">The Astronomical Journal</title>
                <imprint>
                  <publisher>American Astronomical Society</publisher>
                  <biblScope unit="volume">152</biblScope>
                  <date type="datePub">2016</date>
                </imprint>
              </monogr>
              <idno type="arxiv">1607.04708</idno>
              <idno type="bibcode">2016AJ....152..222A</idno>
              <idno type="doi">10.3847/1538-3881/152/6/222</idno>
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              <language ident="en">English</language>
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            <textClass>
              <keywords scheme="author">
                <term xml:lang="en">planetary systems</term>
                <term xml:lang="en">stars: pre-main sequence</term>
                <term xml:lang="en">stars: individual: LkHα 330</term>
                <term xml:lang="en">techniques: interferometric</term>
                <term xml:lang="en">Astrophysics - Earth and Planetary Astrophysics</term>
              </keywords>
              <classCode scheme="halDomain" n="sdu">Sciences of the Universe [physics]</classCode>
              <classCode scheme="halTypology" n="ART">Journal articles</classCode>
              <classCode scheme="halOldTypology" n="ART">Journal articles</classCode>
              <classCode scheme="halTreeTypology" n="ART">Journal articles</classCode>
            </textClass>
            <abstract xml:lang="en">
              <p>Dust trapping accelerates the coagulation of dust particles, and, thus, it represents an initial step toward the formation of planetesimals. We report H-band (1.6 μm) linear polarimetric observations and 0.87 mm interferometric continuum observations toward a transitional disk around LkHα 330. As a result, a pair of spiral arms were detected in the H-band emission, and an asymmetric (potentially arm-like) structure was detected in the 0.87 mm continuum emission. We discuss the origin of the spiral arm and the asymmetric structure and suggest that a massive unseen planet is the most plausible explanation. The possibility of dust trapping and grain growth causing the asymmetric structure was also investigated through the opacity index (β) by plotting the observed spectral energy distribution slope between 0.87 mm from our Submillimeter Array observation and 1.3 mm from literature. The results imply that grains are indistinguishable from interstellar medium-like dust in the east side (β =2.0+/- 0.5) but are much smaller in the west side β ={0.7}&lt;sub&gt;-0.4&lt;/sub&gt;&lt;sup&gt;+0.5&lt;/sup&gt;, indicating differential dust size distribution between the two sides of the disk. Combining the results of near-infrared and submillimeter observations, we conjecture that the spiral arms exist at the upper surface and an asymmetric structure resides in the disk interior. Future observations at centimeter wavelengths and differential polarization imaging in other bands (Y-K) with extreme AO imagers are required to understand how large dust grains form and to further explore the dust distribution in the disk.</p>
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