TY - JOUR
T1 - Kepler-68
T2 - Three planets, one with a density between that of earth and ice giants
AU - Gilliland, Ronald L.
AU - Marcy, Geoffrey W.
AU - Rowe, Jason F.
AU - Rogers, Leslie
AU - Torres, Guillermo
AU - Fressin, Francois
AU - Lopez, Eric D.
AU - Buchhave, Lars A.
AU - Christensen-Dalsgaard, Jørgen
AU - Désert, Jean Michel
AU - Henze, Christopher E.
AU - Isaacson, Howard
AU - Jenkins, Jon M.
AU - Lissauer, Jack J.
AU - Chaplin, William J.
AU - Basu, Sarbani
AU - Metcalfe, Travis S.
AU - Elsworth, Yvonne
AU - Handberg, Rasmus
AU - Hekker, Saskia
AU - Huber, Daniel
AU - Karoff, Christoffer
AU - Kjeldsen, Hans
AU - Lund, Mikkel N.
AU - Lundkvist, Mia
AU - Miglio, Andrea
AU - Charbonneau, David
AU - Ford, Eric B.
AU - Fortney, Jonathan J.
AU - Haas, Michael R.
AU - Howard, Andrew W.
AU - Howell, Steve B.
AU - Ragozzine, Darin
AU - Thompson, Susan E.
PY - 2013/3/20
Y1 - 2013/3/20
N2 - NASA's Kepler Mission has revealed two transiting planets orbiting Kepler-68. Follow-up Doppler measurements have established the mass of the innermost planet and revealed a third Jovian-mass planet orbiting beyond the two transiting planets. Kepler-68b, in a 5.4 day orbit, has MP = 8.3+1.2-2.4 M⊕, RP = 2.31 +0.06-0.09R⊕, and ρP = 3.32 +0.86-0.98 g cm-3, givingKepler-68b a density intermediate between that of the ice giants and Earth.Kepler-68c is Earth-sized, with a radius RP = 0.953+0.037-0.042 R ⊕ and transits on a 9.6 day orbit; validation of Kepler-68c posed unique challenges. Kepler-68d has an orbital period of 580±15 days and a minimum mass of MP sin i = 0.947 ±0.035MJ . Power spectra of the Kepler photometry at one minute cadence exhibit a rich and strong set of asteroseismic pulsation modes enabling detailed analysis of the stellar interior. Spectroscopy of the star coupled with asteroseismic modeling of the multiple pulsation modes yield precise measurements of stellar properties, notably Teff = 5793±74 K,M* = 1.079±0.051M⊙, R* = 1.243*0.019 R ⊙, and ρ*= 0.7903±0.0054 g cm-3, all measured with fractional uncertainties of only a few percent. Models of Kepler-68b suggest that it is likely composed of rock and water, or has a H and He envelope to yield its density ∼3 g cm-3.
AB - NASA's Kepler Mission has revealed two transiting planets orbiting Kepler-68. Follow-up Doppler measurements have established the mass of the innermost planet and revealed a third Jovian-mass planet orbiting beyond the two transiting planets. Kepler-68b, in a 5.4 day orbit, has MP = 8.3+1.2-2.4 M⊕, RP = 2.31 +0.06-0.09R⊕, and ρP = 3.32 +0.86-0.98 g cm-3, givingKepler-68b a density intermediate between that of the ice giants and Earth.Kepler-68c is Earth-sized, with a radius RP = 0.953+0.037-0.042 R ⊕ and transits on a 9.6 day orbit; validation of Kepler-68c posed unique challenges. Kepler-68d has an orbital period of 580±15 days and a minimum mass of MP sin i = 0.947 ±0.035MJ . Power spectra of the Kepler photometry at one minute cadence exhibit a rich and strong set of asteroseismic pulsation modes enabling detailed analysis of the stellar interior. Spectroscopy of the star coupled with asteroseismic modeling of the multiple pulsation modes yield precise measurements of stellar properties, notably Teff = 5793±74 K,M* = 1.079±0.051M⊙, R* = 1.243*0.019 R ⊙, and ρ*= 0.7903±0.0054 g cm-3, all measured with fractional uncertainties of only a few percent. Models of Kepler-68b suggest that it is likely composed of rock and water, or has a H and He envelope to yield its density ∼3 g cm-3.
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U2 - 10.1088/0004-637X/766/1/40
DO - 10.1088/0004-637X/766/1/40
M3 - Article
AN - SCOPUS:84875022025
SN - 0004-637X
VL - 766
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 40
ER -