Title: AmassiveKeplerianprotostellardiskwithflyby-inducedspiralsintheCentralMolecularZone Speaker: XingLu(吕行) Abstract: Currentprotostellarevolutionmodelsoftenconsiderprotostellardisksasisolatedobjects,butinteractionsbetweendisksandpassing-bystarsshouldbefrequentespeciallyinprotoclusters,whichshouldnotbeignored.Itisessentialtoconstrainpropertiesofsuchstar-diskinteractionsfromobservations,soastobetterinformthemodels.Suchinteractions,orbetterknownas'flybys',havebeensuggestedforprotoplanetarydiskssurroundinglow-massprotostars.Hereweextendthisparadigmtomassivestarformingregions,andfindthatflybysarealsoimpactingtheevolutionofamassivedisksurroundinganearlyO-typeprotostar.Usinghighsensitivity,highresolutionALMAlongbaselineobservations,wespatiallyresolveamassivediskdownto300AU,anddetectspiralpatternsinit.Throughaquantitativeanalysisthatcombinesbothanalyticalandnumericalapproaches,wefindcompellingevidencethatthemostlikelyscenariotocreatethespiralsisthroughacloseflybyofanearbygascondensation.ThedetectionoftheKepleriandiskitself,combinedwiththeflybyeventcaughtinaction,suggeststhatthisearlyO-typeprotostarformsinasimilarwaytolow-massstars,subjecttonotonlydisk-mediatedaccretion,butalsoflyby-impactdiskevolution. Bio: XingLuisanassociatedresearcheratShanghaiAstronomicalObservatory.HisresearchfocussesonobservationsofstarformationinmassivemolecularcloudsintheGalaxy,byusinginterferometerssuchasALMA,SMA,andJVLA.HeobtainedaPhDdegreeinastrophysicsin2016atNanjingUniversity.HealsovisitedHarvard-SmithsonianCenterforAstrophysicsasanSMApredoctoralfellowin2012-2015.In2016-2021,heworkedfortheALMAProjectatNationalAstronomicalObservatoryofJapanasanALMAprojectresearchfellow.Hehaspublishedtenfirst-authoredpapersinNatureAstronomy,ApJ,ApJL,andApJS,andhasledsixGrade-AALMAprojects(~top5%ofallprojects).Theseprojectsincludethelongestbaseline(16km),highfrequency(0.5THz),andpolarizationmodes,whicharehigh-risk/high-rewardtasksforALMA. Time:10:00-11:00AM, 12/Oct,Wednesday Meeting ID: 831 4360 9634 Passcode: 436377 Joining Link: https://us02web.zoom.us/j/83143609634?pwd=K0tQcERUTzBldHp0emE0b VideoLink: https://vshare.sjtu.edu.cn/play/2d57ed2a8f840a7cc65408a8dcf6c5c4
更新时间:2022-11-11 直链:astro.sjtu.edu.cn
Areyousearchingforleadingsurgicalsuppliesnearme?Sourceyourmedicalequipmentfromus.Westrivetoprovidedoctorsandpatientswithprofessional,high-quality&reliableproducts&services.
更新时间:2022-11-08 直链:www.greenlandmed.com
AtPICOClinics,weofferfoundationandadvancedaestheticmedicinetrainingUKcoursesforaestheticmedicinedoctors.
更新时间:2022-11-05 直链:www.picoacademy.cn
薛医生提供三甲医院真实医生的在线问诊,医疗健康咨询服务,您可通过薛医生app、查询自己或他人有可能患的疾病,向医生提问,同时您将得到及时权威的三甲医生真实解答。
更新时间:2022-11-03 直链:www.xuedoctor.com