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Planet Masses, Radii, and Orbits from NASA's K2 Mission
Andrew W. Howard, Evan Sinukoff, Sarah Blunt +50
We report the masses, sizes, and orbital properties of 86 planets orbiting 55 stars observed by NASA's K2 Mission with follow-up Doppler measurements by the HIRES spectrometer at t…
Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc
Lea A. Hirsch, Lee Rosenthal, Benjamin J. Fulton +10
We explore the impact of outer stellar companions on the occurrence rate of giant planets detected with radial velocities. We searched for stellar and planetary companions to a vol…
WASP-107b's density is even lower: a case study for the physics of planetary gas envelope accretion and orbital migration
Caroline Piaulet, Björn Benneke, Ryan A. Rubenzahl +21
With a mass in the Neptune regime and a radius of Jupiter, WASP-107b presents a challenge to planet formation theories. Meanwhile, the planet's low surface gravity and the star's b…
An extremely low-density and temperate giant exoplanet
A. Santerne, L. Malavolta, M. R. Kosiarek +68
Transiting extrasolar planets are key objects in the study of the formation, migration, and evolution of planetary systems. In particular, the exploration of the atmospheres of gia…
The Discovery of the Long-Period, Eccentric Planet Kepler-88 d and System Characterization with Radial Velocities and Photodynamical Analysis
Lauren M. Weiss, Daniel C. Fabrycky, Eric Agol +7
We present the discovery of Kepler-88 d ( days, , ) based on six years of radial veloc…
K2-291 b: A rocky super-Earth in a 2.2 day orbit
Molly R. Kosiarek, Sarah Blunt, Mercedes Lopez-Morales +43
K2-291 (EPIC 247418783) is a solar-type star with a radius of R_star = 0.899 0.034 R_sun and mass of M_star=0.934 0.038 M_sun. From K2 C13 data, we found one super-Eart…
Spitzer transit follow-up of planet candidates from the K2 mission
John H. Livingston, Ian J. M. Crossfield, Michael W. Werner +21
We present precision 4.5 m Spitzer transit photometry of eight planet candidates discovered by the K2 mission: K2-52 b, K2-53 b, EPIC 205084841.01, K2-289 b, K2-174 b, K2-87 b,…
Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits
Molly R. Kosiarek, Ian J. M. Crossfield, Kevin K. Hardegree-Ullman +36
We report improved masses, radii, and densities for four planets in two bright M-dwarf systems, K2-3 and GJ3470, derived from a combination of new radial velocity and transit obser…
Deep exploration of Eridani with Keck Ms-band vortex coronagraphy and radial velocities: mass and orbital parameters of the giant exoplanet
Dimitri Mawet, Lea Hirsch, Eve J. Lee +27
We present the most sensitive direct imaging and radial velocity (RV) exploration of Eridani to date. Eridani is an adolescent planetary system, reminiscent of the early So…
60 Validated Planets from K2 Campaigns 5-8
John H. Livingston, Ian J. M. Crossfield, Erik A. Petigura +13
We present a uniform analysis of 155 candidates from the second year of NASA's mission (Campaigns 5-8), yielding 60 statistically validated planets spanning a range of propert…
Kepler-1656b: a Dense Sub-Saturn With an Extreme Eccentricity
Madison T. Brady, Erik A. Petigura, Heather A. Knutson +6
Kepler-1656b is a 5 planet with an orbital period of 32 days initially detected by the prime Kepler mission. We obtained precision radial velocities of Kepler-1656 with Keck/…
The California-Kepler Survey. VI: Kepler Multis and Singles Have Similar Planet and Stellar Properties Indicating a Common Origin
Lauren M. Weiss, Howard T. Isaacson, Geoffrey W. Marcy +7
The California-Kepler Survey (CKS) catalog contains precise stellar and planetary properties for the \Kepler\ planet candidates, including systems with multiple detected transiting…
Dynamics and Formation of the Near-Resonant K2-24 System: Insights from Transit-Timing Variations and Radial Velocities
Erik A. Petigura, Björn Benneke, Konstantin Batygin +8
While planets between the size of Uranus and Saturn are absent within the Solar System, the star K2-24 hosts two such planets, K2-24b and c, with radii equal to and $7.5~…
A 2 Earth Radius Planet Orbiting the Bright Nearby K-Dwarf Wolf 503
Merrin S. Peterson, Björn Benneke, Courtney D. Dressing +20
Since its launch in 2009, the Kepler telescope has found thousands of planets with radii between that of Earth and Neptune. Recent studies of the distribution of these planets have…
HAT-P-11: Discovery of a Second Planet and a Clue to Understanding Exoplanet Obliquities
Samuel W. Yee, Erik A. Petigura, Benjamin J. Fulton +10
HAT-P-11 is a mid-K dwarf that hosts one of the first Neptune-sized planets found outside the solar system. The orbit of HAT-P-11b is misaligned with the star's spin --- one of the…
Do close-in giant planets orbiting evolved stars prefer eccentric orbits?
Samuel K. Grunblatt, Daniel Huber, Eric Gaidos +7
The NASA Kepler and K2 Missions have recently revealed a population of transiting giant planets orbiting moderately evolved, low-luminosity red giant branch stars. Here, we present…
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars III: A High Mass & Low Envelope Fraction for the Warm Neptune K2-55b
Courtney D. Dressing, Evan Sinukoff, Benjamin J. Fulton +23
K2-55b is a Neptune-sized planet orbiting a K7 dwarf with a radius of , a mass of , and an effective temperature of $4300^{+1…
275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0-10
Andrew W. Mayo, Andrew Vanderburg, David W. Latham +25
Since 2014, NASA's K2 mission has observed large portions of the ecliptic plane in search of transiting planets and has detected hundreds of planet candidates. With observations pl…
Planetary Candidates from K2 Campaign 16
Liang Yu, Ian J. M. Crossfield, Joshua E. Schlieder +20
Given that Campaign 16 of the K2 mission is one of just two K2 campaigns observed so far in "forward-facing" mode, which enables immediate follow-up observations from the ground, w…
Two warm, low-density sub-Jovian planets orbiting bright stars in K2 campaigns 13 and 14
Liang Yu, Joseph E. Rodriguez, Jason D. Eastman +25
We report the discovery of two planets transiting the bright stars HD 89345 (EPIC 248777106, , ) in K2 Campaign 14 and HD 286123 (EPIC 247098361, , $K=8.…
Validation and Initial Characterization of the Long Period Planet Kepler-1654 b
C. A. Beichman, H. A. C. Giles, R. Akeson +12
Fewer than 20 transiting Kepler planets have periods longer than one year. Our early search of the Kepler light curves revealed one such system, Kepler-1654 b (originally KIC~84106…
The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets
Erik A. Petigura, Geoffrey W. Marcy, Joshua N. Winn +7
Probing the connection between a star's metallicity and the presence and properties of any associated planets offers an observational link between conditions during the epoch of pl…
The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
Jessie L. Christiansen, Ian J. M. Crossfield, Geert Barentsen +25
K2-138 is a moderately bright (V = 12.2, K = 10.3) main sequence K-star observed in Campaign 12 of the NASA K2 mission. It hosts five small (1.6-3.3R_Earth) transiting planets in a…
Planet Candidates from K2 Campaigns 5-8 and Follow-Up Optical Spectroscopy
Erik A. Petigura, Ian J. M. Crossfield, Howard Isaacson +10
We present 151 planet candidates orbiting 141 stars from K2 campaigns 5-8 (C5-C8), identified through a systematic search of K2 photometry. In addition, we identify 16 targets as l…