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A Transi)ng Circumbinary Planet in a Quadruple Star System
Meg Schwamb (Yale University) [email protected]
Image Credit: Haven Giguere
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
Transits spoBed in Kepler light curve of eclipsing binary KIC 4862625
Primary Eclipse
Secondary Eclipse
Planet Transit
Primary Eclipse
Secondary Eclipse Secondary Eclipse
Planet Transit
Quarter 2 Quarter 4
Days from Start of Quarter 1 Days from Start of Quarter 1
Robert Gagliano Kian Jek
Schwamb et al. (ApJ submiDed)
Circumbinary planet, orbi)ng both stars in binary star system
Time (BJD-2455000)
Nor
mal
ized
Flu
x x1
000
Nor
mal
ized
Flu
x x1
000
Q2 Q4 Q5 Q7
Q8 Q11Q10
Keck HIRES Radial Veloci)es
Schwamb et al. (ApJ submiDed)
Phase (P =20.000251025, T!=54967.8195)
Radi
al V
eloc
ity (k
m s"
#)
Binary has 20 day orbital period
Adap)ve Op)cs Keck Observa)ons N
E
0.5"Schwamb et al. (ApJ submiDed)
Column Column
Row
0.7’’ Contaminator KIC 4862625
Column Column
Row
0.07’’ Contaminator KIC 4862625
• 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
• We esEmate an age of ~2 Gyr for the system
Planet Hunters’ First Confirmed Planet
Image Credit: Haven Giguere/Yale
PH1
To
Ea
rth
Aa
Ab
b
0.5 AU
Aa
Ab b
Kepler−47
To
Ea
rth
A
B
b
c
0.5 AU
AB
b
c
0.5 AU0.5 AU 0.5 AUKepler-16Kepler-35Kepler-34
Kepler-38
b
A
B
This work is supported by the NSF Astronomy & Astrophysics Postdoctoral Fellowship program and NASA
PresentaEon slides, images & paper preprint:
hBp://www.planethunters.org/dpspress2012
Username: planet Password: hunters
