Science文献发现太阳系外双星系统中的行星.pptx

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1、DirectimagingdiscoveryofaJovianexoplanetwithinatriple-starsystemKevinWagneretal.Science2016BackgroundDirectimagingallowsforthedetectionandcharacterizationofexoplanetsviatheirthermalemission.Mostdirectimagingsurveyshavetraditionallyexcludedvisualbinaryormultiplesystemswhoseseparationsarelessth

2、anafewhundredastronomicalunits(au)duetotheassumptionthatsuchplanetarysystemswouldeitherbedisruptedorneverform,aswellastheincreasedtechnicalcomplexityofdetectingaplanetamongstthescatteredlightofmultiplestars.Multi-starsystemsareasnumerousassinglestars.Planetsonwideorbits(detectablebydirectimag

3、ing)mightarisemorefrequentlyinmulti-starsystemsduetoplanet-planetorplanet-starinteractions.BackgroundWidefieldX-rayimageoftheScorpius-CentaurusassociationconstructedfromthedataoftheROSATAllSkySurveyBackgroundmaps.TheyellowdotsmarkthepositionsofbrightX-raysourcesdetectedinthesurvey(onlyabout10

4、%ofthebrightestX-raysourcesareshown).ThebluecirclesmarkthethreesubgroupsUpperScorpius,UpperCentaurus-Lupus,andLowerCentaurus-Crux(fromlefttoright).Toinvestigatethefrequencyoflong-periodgiantplanetsbotharoundsinglestarsandinmulti-starsystems,wearesamplingapopulationof~100youngsingleandmultiple

5、A-typestarsinthenearbyUpperScorpius-Centaurus-Lupusassociation.TheScorpius-CentaurusAssociationiscenteredabout470light-yearsawayintheGouldBelt(thenearestOBassociationtotheSun)andcontainsseveralhundredstars,mostlyoftypeB.About12millionyearsagothemostmassivestarinUpperCentaurus-Lupuswentsuperno

6、va,creatingalargeshockwave.ThisshockwavepassedthroughtheUpperScorpiuscloudabout5millionyearsago,andtriggeredthestarformationprocessthere.Shortlyafter,thestrongwindsofthenumerousmassivestarsinUpperScorpiusstartedtodispersethemolecularcloudandhaltedthestarformationprocess.About1.5millionyearsag

7、othemostmassivestarinUpperScorpiusexplodedasasupernova.DiscussionWeobservedHD131399onJune12,2015,obtainingawiderangeofnear-infraredspectralcoveragefromY–toK-band(0.95–2.25μm)anddiffraction-limitedimagingwithan8.2-mtelescopeapertureOurobservat