Ph press talk

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Ph press talk

  1. 1. A  Transi)ng  Circumbinary  Planet  in  a   Quadruple  Star  System   Meg  Schwamb  (Yale  University)     megan.schwamb@yale.edu  Image  Credit:  Haven  Giguere  
  2. 2. Discovery  and  Confirma)on  of  PH1:  A  Circumbinary  Planet   in  a  Four  Star  System     •  Planet  spoDed  by  ciEzen  scienEsts   reviewing  Kepler  light  curves  on  the  Planet   Hunters  (planethunters.org)  website     •   Combining  the  Kepler  light  curve  +   measured  radial  velociEes,  we  have   confirmed  the  planet  and  the  properEes   of  its  host  stars     •  First  planet  discovered  in  a  four  star   system    
  3. 3. Transits  spoBed  in  Kepler  light  curve  of  eclipsing   binary  KIC  4862625   Quarter 2 Quarter 4 Secondary Eclipse Planet Transit Planet Transit Secondary Eclipse Secondary Eclipse Primary Eclipse Primary Eclipse Days from Start of Quarter 1 Days from Start of Quarter 1 Robert  Gagliano     Kian  Jek  
  4. 4. Circumbinary  planet,  orbi)ng  both   stars  in  binary  star  system  x1000 Normalized Flux Q2 Q4   Q5 Q7 Q8 Q10 Q11 x1000 Normalized Flux Time (BJD-2455000) Schwamb  et  al.  (ApJ  submiDed)  
  5. 5. Keck  HIRES  Radial  Veloci)es    Radial Velocity (km s-1) Phase (P =20.000251025, T0=54967.8195) Schwamb  et  al.  (ApJ  submiDed)   Binary  has  20  day  orbital  period  
  6. 6. Adap)ve  Op)cs  Keck  Observa)ons   0.7’’ Contaminator KIC 4862625 N ERow 0.07’’ Contaminator KIC 4862625 Column Column Row 0.5" Schwamb  et  al.  (ApJ  submiDed)   Column Column
  7. 7. Planet  Hunters’  First  Confirmed  Planet     •  PH1  is  a  6.18  ±  0.17    Earth  radii   planet  orbits  its  parent  stars  every   138.3  days  (semimajor  axis  =0.65   AU)     •  PH1  is  <  0.53  Jupiter  masses     •  The  parent  eclipsing  stars  are  1.7   &  0.4  Solar  radii  (1.5  &  0.41  Solar   masses)       •  The  second  pair  of  stars  at  ~1000   AU  is  bound  to  the  planetary   system    Image  Credit:  Haven  Giguere/Yale     •  We  esEmate  an  age  of  ~2  Gyr  for   the  system  
  8. 8. 0.5 AU 0.5 AU 0.5 AUKepler-34 Kepler-35 Kepler-16Kepler-38 Kepler−47 0.5 AU PH1 0.5 AU c A Aa B B A Ab To Earth To Earth b b b b Ab b B A c Aa
  9. 9. PresentaEon  slides,  images  &  paper  preprint:    hBp://www.planethunters.org/dpspress2012     Username:  planet            Password:  hunters   megan.schwamb@yale.edu   This  work  is  supported  by  the  NSF  Astronomy  &     Astrophysics  Postdoctoral  Fellowship  program  and  NASA  

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