CHARACTERIZING K2 PLANET DISCOVERIES: A SUPER-EARTH TRANSITING THE BRIGHT K DWARF HIP 116454

By Andrew Vanderburg, B. Montet, J. Johnson, Lars A. Buchhave, L. Zeng, F. Pepe, A. Cameron, D. Latham, E. Molinari, S. Udry and 36 more. 2014

82 citations recorded by the source corpus.

We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1 dwarf with high proper motion and a parallax-based distance of 55.2 ± 5.4 pc. Based on high-resolution optical spectroscopy, we find that the host star is metal-poor with [Fe/H] =−0.16 ± 0.08 and has a radius R⋆ = 0.716 ± 0.024 R☉ and mass M⋆ = 0.775 ± 0.027 M☉. The star was observed by the Kepler spacecraft during its Two-Wheeled Concept Engineering Test in 2014 February. During the 9 days of observations, K2 observed a single transit event. Using a new K2 photometric analysis technique, we are able to correct small telescope drifts and recover the observed transit at high confidence, corresponding to a planetary radius of Rp = 2.53 ± 0.18 R⊕. Radial velocity observations with the HARPS-N spectrograph reveal a 11.82 ± 1.33 M⊕ planet in a 9.1 day orbit, consistent with the transit depth, duration, and ephemeris. Follow-up photometric measurements from the MOST satellite confirm the transit observed in the K2 photometry and provide a refined ephemeris, making HIP 116454 b amenable for future follow-up observations of this latest addition to the growing population of transiting super-Earths around nearby, bright stars.

Subfields: Astronomy and Astrophysics, Instrumentation

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Citations in the corpus

STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 17 PLANETS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION (2015, background): “There has been considerable effort to recover these planetary signals, and to date six planets have been confirmed orbiting three stars in the K2 data (Armstrong et al. 2015; Crossfield et al. 2015; Vanderburg et al. 2015).”
A SYSTEMATIC SEARCH FOR TRANSITING PLANETS IN THE K2 DATA (2015, background): “These data have produced the first confirmed planet found with K2 (Vanderburg et al. 2014).”
PLANETARY CANDIDATES FROM THE FIRST YEAR OF THE K2 MISSION (2015, methodology): “We adopted a similar procedure to that described in Vanderburg et al. (2015b) and Becker et al. (2015), and modeled the flat field as splines in arclength (with breakpoints spaced roughly every 0.25 arcseconds in arclength), the transits of all planet candidates orbiting each star with Mandel &…”
A NEARBY M STAR WITH THREE TRANSITING SUPER-EARTHS DISCOVERED BY K2 (2015, background): “Along with HIP 116454 (Vanderburg et al. 2014), the discovery of K2-3 shows that K2 is already finding fascinating new targets for observation with JWST and heralds an era of further unprecedented discoveries in the TESS era.”
THE K2 ECLIPTIC PLANE INPUT CATALOG (EPIC) AND STELLAR CLASSIFICATIONS OF 138,600 TARGETS IN CAMPAIGNS 1–8 (2015, background): “…have a bimodal distribution as a result of programs targeting bright FGK dwarfs and red giants for transiting planet searches and galactic archeology (e.g. Vanderburg et al. 2015; Stello et al. 2015), while M dwarf exoplanet surveys (e.g. Crossfield et al. 2015) typically propose fainter targets.”
THE MASS OF Kepler-93b AND THE COMPOSITION OF TERRESTRIAL PLANETS (2014, unknown): “…et al. 2014), CoRoT-7b (Barros et al. 2014; Haywood et al. 2014), GJ1214b (Charbonneau et al. 2009), HD97658b (Dragomir et al. 2013), HIP116454b (Vanderburg et al. 2014), Kepler-36b (Carter et al. 2012), Kepler-78b (Pepe et al. 2013; Howard et al. 2013), and Kepler-10b and 10c (Dumusque et al.…”
K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0 (2015, background): “Already the K2 mission has been used to identify new candidate eclipsing binaries (Conroy et al. 2014), and produced new interesting planetary systems (Crossfield et al. 2015; Vanderburg et al. 2015).”
One of the closest exoplanet pairs to the 3:2 mean motion resonance: K2-19b and c (2015, background): “A number of interesting systems have already come to light (Crossfield et al. 2015; Vanderburg et al. 2014; Foreman-Mackey et al. 2015).”
WASP-47: A HOT JUPITER SYSTEM WITH TWO ADDITIONAL PLANETS DISCOVERED BY K2 (2015, methodology): “We used the resulting light curve and measured flat field as starting points in a simultaneous fit of the three transit signals, the flat field, and long term photometric variations (following Vanderburg et al. 2015).”
Inferring probabilistic stellar rotation periods using Gaussian processes (2017, methodology): “For single stars, GP rotation inference takes a reasonable amount of time and has already been used on exoplanet hosts (e.g. Haywood et al. 2014; Vanderburg et al. 2015).”