A PLANET IN AN 840 DAY ORBIT AROUND A KEPLER MAIN-SEQUENCE A STAR FOUND FROM PHASE MODULATION OF ITS PULSATIONS
@article{Murphy2016API, title={A PLANET IN AN 840 DAY ORBIT AROUND A KEPLER MAIN-SEQUENCE A STAR FOUND FROM PHASE MODULATION OF ITS PULSATIONS}, author={Simon J. Murphy and Timothy R. Bedding and Hiromoto Shibahashi}, journal={The Astrophysical Journal}, year={2016}, volume={827} }
We have detected a 12 M planet orbiting in or near the habitable zone of a main-sequence A star via the pulsational phase shifts induced by orbital motion. The planet has an orbital period of 840 ± 20 days and an eccentricity of 0.15. All known planets orbiting main-sequence A stars have been found via the transit method or by direct imaging. The absence of astrometric or radial velocity detections of planets around these hosts makes ours the first discovery using the orbital motion. It is also…
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References
SHOWING 1-10 OF 34 REFERENCES
A giant planet orbiting the ‘extreme horizontal branch’ star V 391 Pegasi
- Physics, GeologyNature
- 2007
The detection of a planet orbiting a post-red-giant star demonstrates that planets with orbital distances of less than 2 au can survive the red-Giant expansion of their parent stars.
Direct Imaging of Multiple Planets Orbiting the Star HR 8799
- Physics, GeologyScience
- 2008
High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units.
Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
- Physics, Geology
- 2014
(abridged) We have obtained precise radial velocities for a sample of 373 G and K type giants at Lick Observatory regularly over more than 12 years. Planets have been identified around 15 giant…
A Giant Planet Imaged in the Disk of the Young Star β Pictoris
- Physics, GeologyScience
- 2010
It is shown that the ~10-million-year-oldβ Pictoris system hosts a massive giant planet, β Pictoris b, located 8 to 15 astronomical units from the star, which confirms that gas giant planets form rapidly within disks and validates the use of disk structures as fingerprints of embedded planets.
Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants
- Physics, Geology
- 2007
We report precision Doppler measurements of three intermediate-mass subgiants obtained at Lick and Keck Observatories. All three stars show variability in their radial velocities consistent with…
Kepler detection of a new extreme planetary system orbiting the subdwarf-B pulsator KIC 10001893
- Physics, Geology
- 2014
KIC 10001893 is one out of 19 subdwarf-B (sdB) pulsators observed by the Kepler spacecraft in its primary mission. In addition to tens of pulsation frequencies in the g-mode domain, its Fourier…
Finding binaries from phase modulation of pulsating stars with Kepler – IV. Detection limits and radial velocity verification
- Physics, Geology
- 2016
We explore the detection limits of the phase modulation (PM) method of finding binary systems among multi-periodic pulsating stars. The method is an attractive way of finding non-transiting planets…
"Retired" Planet Hosts: Not So Massive, Maybe Just Portly After Lunch
- Physics, Geology
- 2011
Studies of the planet abundance as a function of stellar mass have suggested a strong increase in the frequency of planet occurrence around stars more massive than $1.5 M_\odot$, and that such stars…
RETIRED A STARS AND THEIR COMPANIONS. VII. 18 NEW JOVIAN PLANETS
- Physics, Geology
- 2011
We report the detection of 18 Jovian planets discovered as part of our Doppler survey of subgiant stars at Keck Observatory, with follow-up Doppler and photometric observations made at McDonald and…
HAT-P-57b: A Short-Period Giant Planet Transiting A Bright Rapidly Rotating A8V Star Confirmed Via Doppler Tomography
- Physics, Geology
- 2015
We present the discovery of HAT-P-57b, a P = 2.4653 day transiting planet around a V = 10.465 +- 0.029 mag, Teff = 7500 +- 250 K main sequence A8V star with a projected rotation velocity of v sin i =…