Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup ›...
Transcript of Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup ›...
![Page 1: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/1.jpg)
Beforewestart
Briefintroduc-onoftheplansandideasfortheplanetarygroup(LinkswithChileanUniversi-esJC/OneDayWS;PlanetarySystemsII)
Visitorsencouraged
Memberstoprovidecross‐trainingtoPAOmembers(PAOisaplacetotalkaboutscience!PlanetsisakeydriverforthefutureofESO,weshouldtogrowexper-seandinterestonthefield)
Frequencyofthemee-ngs–Everytwoweeksseemsagoodnumber
![Page 2: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/2.jpg)
Spin‐orbitanglemeasurementsforsixsoutherntransitingplanetsAmauryTriaudetal
http://www.superwasp.org/documents/triaud2010_rossiter.pdf
![Page 3: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/3.jpg)
“Thisisarealbombwearedroppingintothefieldofexoplanets,”saysAmauryTriaud,aPhDstudentattheGenevaObservatorywho,withAndrewCameronandDidierQueloz,leadsamajorpartoftheobserva-onalcampaign.
WHY???
![Page 4: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/4.jpg)
Rossiter‐McLaughlineffect
Howaboutthespectroscopictransit?
Weallknowhowaphotometrictransitlookslike
![Page 5: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/5.jpg)
Radialvelocity
![Page 6: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/6.jpg)
Thetransi/ngobjectblocksthestellardiskproducingashi:intheRV
Theamplitudeofthiseffectisrelatedtothegeometryandtotherota/onalvelocity
![Page 7: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/7.jpg)
Ohtaetal.(2005)
![Page 8: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/8.jpg)
Ohtaetal.(2005)
![Page 9: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/9.jpg)
Thus:
• forβ=0theplanetaryorbitisperpendiculartothestellarrota/onaxis;• Forβ=90theorbitisalongtherota/onaxis
• Forβ>90theorbitalmo/onisretrograde
λ(orβ inTriaud’spaper)istheprojectedspinorbitmisalignmentangle.
Gaudi&Winn2006,ApJ
![Page 10: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/10.jpg)
Measurements
Globalfiangofphotometrictransit,RVcurveandspectroscopictransit
6transi-ngplanetsfoundbyWASPwerestudiedinthepaper
3ofthemhaveβ>90(retrogradeorbits)
3othershaveβ~0
WASP‐15b;β=139 WASP‐5b;β~0
AmauryTriaudetal
![Page 11: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/11.jpg)
Therealmisalignment
Theymeasuredthesky‐projectedspin‐orbitangle
Therealangleψ ises-matedusingtheargumentthatthespinaxisisisotropicallydistributed
cosψ=cosIcosi+sinIcosβ
Iistheinclina-onofthestellarspinaxisandItheinclina-onoftheplanet’sorbitalaxis.
AmauryTriaudetal
![Page 12: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/12.jpg)
Discussion
26RMeffectshavebeenobservedsofar
14haveβ<22andareconsideredaligned
Theyfindthatthereisa82%probabilitythatψis>22deg(SolarSystemcase)
AmauryTriaudetal
![Page 13: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/13.jpg)
KozaiMechanism
Inapresenceofa3rddistantbody,iftheorbitalplaneoftheinnerbinaryisnotalignedwiththeouterorbit,thee_inandtheinclina-onbetweenthetwoorbitswilloscillateincycles.
KC+Tidalfric-onthee_inbecomeslargesothatintheperiastronpassage-destakeoverforawhileworkingtowardsacircularorbit.
![Page 14: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/14.jpg)
Theoreticalprediction
Thepredic-onforthemisalignmentspin‐planetaryorbitForsystemswithathirdcompanion.(FabryckyandTremaine2007)
![Page 15: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/15.jpg)
Itmatchesbeau-fullytheobserva-ons!
![Page 16: Before we start - eso.org › sci › activities › santiago › projects › PlanetaryGroup › j… · Before we start Brief introducon of the plans and ideas for the planetary](https://reader033.fdocuments.in/reader033/viewer/2022060406/5f0f61037e708231d443dde8/html5/thumbnails/16.jpg)
Conclusions
RMmeasurementsobtainedwithhighaccuracyRVdatasuggestthat>80%ofthehot‐jupitersaremisalignedwithanglessome-mes>90%
Forma-onofhot‐jupitersviamigra-onrequiresinterac-onswiththediscandthereforecoplanarity
Kozaimechanismwouldcausetheinnerorbittooscillate(e_in,inclina-on)andreducetheorbitalperiod.
Thepredicteddistribu-onofspin‐orbitangleisverysimilartotheonedrawnfromsta-s-calargumentstransformingtheβdistribu-on.