Kepler-16b

Kepler-16b
NASA/JPL-Caltech · Public domain · source
Name	Kepler-16b
Discoverer	NASA
Discovery site	Kepler (spacecraft)
Discovery date	2011
Semimajor	0.7048 AU
Period	229 days
Radius	0.753 R_J
Mass	0.333 M_J
Eccentricity	0.007
Star	Kepler-16

Kepler-16b Kepler-16b is a circumbinary planet discovered by NASA's Kepler (spacecraft) team in 2011. The planet orbits a pair of stars in the Cygnus (constellation) field monitored by the Kepler mission, and its detection confirmed theoretical predictions about planets around stellar binaries from studies associated with Alan Boss, Debra Fischer, and observational programs linked to Kepler Science Center. The discovery paper involved collaborations among institutions such as NASA Ames Research Center, Harvard–Smithsonian Center for Astrophysics, and University of California, Santa Cruz.

Discovery

The discovery emerged from transit timing and photometric analysis performed by teams at NASA Ames Research Center, SETI Institute, and Jet Propulsion Laboratory. Data from the Kepler (spacecraft) pipeline flagged transit signals that were analyzed by researchers including members of the Kepler Science Team and theoreticians influenced by work from William Borucki, David Charbonneau, and Geoff Marcy. Follow-up radial-velocity and modeling efforts involved collaboration with observatories such as Palomar Observatory, W. M. Keck Observatory, and data reduction groups at Stanford University and California Institute of Technology.

Stellar system

Kepler-16b orbits a binary composed of a primary K-type main-sequence star and a secondary M-type main-sequence star designated within catalogs associated with 2MASS and analyzed by teams at Harvard University and Massachusetts Institute of Technology. The system is cataloged in databases maintained by SIMBAD and cross-referenced in the Exoplanet Archive curated by NASA Exoplanet Science Institute. The binary architecture recalls investigations into circumbinary dynamics studied in works by Jack Wisdom, Scott Tremaine, and Rory Barnes, and situates Kepler-16 among systems compared with OGLE-2007-BLG-349L and binaries observed by Sloan Digital Sky Survey campaigns.

Physical characteristics

Kepler-16b has a radius close to that of Saturn and a mass intermediate between Saturn and Jupiter, placing it in the sub-Jovian category often discussed in reviews by Sara Seager, Nicolas Cowan, and Adam Burrows. Interior structure modeling referenced in studies at University of Arizona and University of Cambridge explores compositions analogous to Ice giants and gas giants examined in surveys by European Southern Observatory teams. Comparative planetology with solar system worlds such as Saturn (planet), Jupiter, and Uranus is used in synthetic spectra generated by researchers at Max Planck Institute for Astronomy and Dartmouth College.

Orbit and dynamics

The planet follows a nearly circular orbit around the barycenter of the binary with a period of ~229 days; dynamical analyses draw on methods from Murray & Dermott and N-body studies advanced at Princeton University and University of California, Berkeley. Stability criteria tested by groups at Northwestern University and University of Colorado Boulder reference secular perturbation theory linked to work by Pierre-Simon Laplace and Joseph-Louis Lagrange, and numerical experiments mirror techniques used in investigations of resonant dynamics in systems like GJ 876 and Kepler-16's contemporaries examined by Jonathan Fortney and Renu Malhotra.

Atmosphere and climate models

Atmospheric modeling efforts use radiative transfer codes developed at NASA Goddard Space Flight Center, Laboratoire d'Astrophysique de Marseille, and University of Exeter to explore hydrogen-helium dominated envelopes akin to those studied by Yoram Lithwick and Christopher Cowan. Climate simulations incorporate insolation variations from the binary stars and adapt general circulation models pioneered by teams at MIT and University of Oxford. Comparative spectral synthesis links to opacity databases curated at Vienna University of Technology and collaborative projects with University of Toronto and Carnegie Institution for Science.

Formation and evolution

Formation scenarios leverage core accretion and disk-instability frameworks developed by Alessandro Morbidelli, Mordecai-Mark Mac Low, and George W. Wetherill; protoplanetary disk studies from Atacama Large Millimeter/submillimeter Array observers and theoretical work at ETH Zurich inform migration and gap-opening processes. Evolutionary models referencing cooling tracks by Guillaume Chabrier and Icko Iben explore contraction and thermal histories relevant to Kepler-16b analogs documented in surveys by European Space Agency missions and interpreted by groups at University of Chicago.

Observational studies and characterization

Subsequent characterization has used transit photometry refinement by teams at Harvard–Smithsonian Center for Astrophysics and time-series analysis techniques developed at University of Oxford. Comparative follow-up with instruments on Hubble Space Telescope, ground-based observatories like Subaru Telescope and Very Large Telescope, and archival assessments in the Kepler Archive have influenced atmospheric retrievals by researchers at University College London and University of Washington. The system remains a benchmark in circumbinary research alongside targets studied in programs led by European Southern Observatory and National Optical Astronomy Observatory, and it features in educational materials from Smithsonian Institution and public outreach by Jet Propulsion Laboratory.

Category:Exoplanets