Subaru/COMICS Mid-Infrared Observation of the Near-Nucleus Region of Comet 17P/Holmes at the Early Phase of an Outburst

Publications of the Astronomical Society of Japan

Sarugaku, Yuki⁴  Honda, Mitsuhiko¹  Fuse, Tetsuharu⁷  Kadono, Toshihiko²  Takato, Naruhisa⁶  Furusho, Reiko⁵  Ishiguro, Masateru⁵  Ootsubo, Takafumi⁸  Sakon, Itsuki³  Watanabe, Jun-ichi⁵ 

[1] Department of Information Science, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 257-0031;Institute of Laser Engineering, Osaka University, 2-6, Yamadagaoka, Suita 565-0871;Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033;Kiso Observatory, Institute of Astronomy, University of Tokyo, Mitake 10762-30, Kiso, Nagano 397-0101;National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588;Subaru Telescope, Natinonal Astronomical Observatory of Japan, Hilo, HI, USA;Subaru Telescope, National Astronomical Observatory of Japan, Hilo, HI, USA;Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510

关键词: comets;    "comets: individual (17P/Holmes)";    "interplanetary medium";    "solar system";   

DOI  :  10.1093/pasj/61.4.679

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Mid-infrared8–25$$mu$$mimagingandspectroscopicobservationsofthecomet17P/Holmesintheearlyphaseofitsoutburstinbrightnesswereperformedon2007October25–28UTusingtheCooledMid-InfraredCameraandSpectrometer(COMICS)onthe8.2-mSubaruTelescope.Wedetectedanisolateddustcloudthatmovedtowardthesouth-westdirectionfromthenucleus.The11.2$$mu$$mpeakofacrystallinesilicatefeatureontoabroadamorphoussilicatefeaturewasalsodetectedbothinthecentralcondensationofthenucleusandanisolateddustcloud.Thecolortemperatureoftheisolateddustcloudwasestimatedtobe$$sim$$200K,whichisslightlyhigherthantheblack-bodytemperature.Ouranalysisofthemotionindicatesthattheisolatedcloudmovedanti-sunward.Weproposeseveralpossibilitiesforthemotionofthecloud:fluffydustparticlesintheisolatedcloudstartedtodepartfromthenucleusduetoradiationpressurealmostassoonasthemainoutburstoccurred,ordustparticlesmovedbysomeotheranti-sunwardforces,suchasarocketeffectandphotophoresiswhenthesurroundingdustcomabecameopticallythin.Theoriginandthenatureoftheisolateddustcloudarediscussedinthispaper.

【 授权许可】

Unknown