- ID:
- ivo://CDS.VizieR/J/ApJ/768/127
- Title:
- Q1-11 Kepler light curve of KIC 4862625
- Short Name:
- J/ApJ/768/127
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery and confirmation of a transiting circumbinary planet (PH1b) around KIC 4862625, an eclipsing binary in the Kepler field. The planet was discovered by volunteers searching the first six Quarters of publicly available Kepler data as part of the Planet Hunters citizen science project. Transits of the planet across the larger and brighter of the eclipsing stars are detectable by visual inspection every ~137 days, with seven transits identified in Quarters 1-11. The physical and orbital parameters of both the host stars and planet were obtained via a photometric-dynamical model, simultaneously fitting both the measured radial velocities and the Kepler light curve of KIC 4862625. The 6.18+/-0.17R_{Earth}_ planet orbits outside the 20 day orbit of an eclipsing binary consisting of an F dwarf (1.734+/-0.044R_{sun}_, 1.528+/-0.087M_{sun}_) and M dwarf (0.378+/-0.023R_{sun}_, 0.408+/-0.024M_{sun}_). For the planet, we find an upper mass limit of 169M_{Earth}_ (0.531 Jupiter masses) at the 99.7% confidence level. With a radius and mass less than that of Jupiter, PH1b is well within the planetary regime. Outside the planet's orbit, at ~1000 AU, a previously unknown visual binary has been identified that is likely bound to the planetary system, making this the first known case of a quadruple star system with a transiting planet.
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- ID:
- ivo://CDS.VizieR/J/PASP/124/1279
- Title:
- Q3 Kepler's combined photometry
- Short Name:
- J/PASP/124/1279
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Kepler Mission is searching for Earth-size planets orbiting solar-like stars by simultaneously observing >160000 stars to detect sequences of transit events in the photometric light curves. The Combined Differential Photometric Precision (CDPP) is the metric that defines the ease with which these weak terrestrial transit signatures can be detected. An understanding of CDPP is invaluable for evaluating the completeness of the Kepler survey and inferring the underlying planet population. This paper describes how the Kepler CDPP is calculated, and introduces tables of rms CDPP on a per-target basis for 3-, 6-, and 12-hr transit durations, which are now available for all Kepler observations. Quarter 3 is the first typical set of observations at the nominal length and completeness for a quarter, from 2009 September 18 to 2009 December 16, and we examine the properties of the rms CDPP distribution for this data set. Finally, we describe how to employ CDPP to calculate target completeness, an important use case.
- ID:
- ivo://CDS.VizieR/J/ApJ/768/155
- Title:
- Radial velocities and photometry of HD 38529 system
- Short Name:
- J/ApJ/768/155
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The transit signature of exoplanets provides an avenue through which characterization of exoplanetary properties may be undertaken, such as studies of mean density, structure, and atmospheric composition. The Transit Ephemeris Refinement and Monitoring Survey is a program to expand the catalog of transiting planets around bright host stars by refining the orbits of known planets discovered with the radial velocity technique. Here we present results for the HD 38529 system. We determine fundamental properties of the host star through direct interferometric measurements of the radius and through spectroscopic analysis. We provide new radial velocity measurements that are used to improve the Keplerian solution for the two known planets, and we find no evidence for a previously postulated third planet. We also present 12 years of precision robotic photometry of HD 38529 that demonstrate the inner planet does not transit and the host star exhibits cyclic variations in seasonal mean brightness with a timescale of approximately six years.
- ID:
- ivo://CDS.VizieR/J/ApJ/757/18
- Title:
- Radial velocities for 16 hot Jupiter host stars
- Short Name:
- J/ApJ/757/18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We provide evidence that the obliquities of stars with close-in giant planets were initially nearly random, and that the low obliquities that are often observed are a consequence of star-planet tidal interactions. The evidence is based on 14 new measurements of the Rossiter-McLaughlin effect (for the systems HAT-P-6, HAT-P-7, HAT-P-16, HAT-P-24, HAT-P-32, HAT-P-34, WASP-12, WASP-16, WASP-18, WASP-19, WASP-26, WASP-31, Gl 436, and Kepler-8), as well as a critical review of previous observations. The low-obliquity (well-aligned) systems are those for which the expected tidal timescale is short, and likewise the high-obliquity (misaligned and retrograde) systems are those for which the expected timescale is long. At face value, this finding indicates that the origin of hot Jupiters involves dynamical interactions like planet-planet interactions or the Kozai effect that tilt their orbits rather than inspiraling due to interaction with a protoplanetary disk. We discuss the status of this hypothesis and the observations that are needed for a more definitive conclusion.
- ID:
- ivo://CDS.VizieR/J/ApJ/708/1366
- Title:
- Radial velocities for 61 Vir
- Short Name:
- J/ApJ/708/1366
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present precision radial velocity data that reveal a multiple exoplanet system orbiting the bright nearby G5V star 61 Virginis. Our 4.6 years of combined Keck/HIRES and Anglo-Australian Telescope precision radial velocities indicate the hitherto unknown presence of at least three planets orbiting this well-studied star. These planets are all on low-eccentricity orbits with periods of 4.2, 38.0, and 124.0 days, and projected masses (Msini) of 5.1, 18.2, and 24.0M_{earth}_, respectively. Test integrations of systems consistent with the radial velocity data suggest that the configuration is dynamically stable.
- ID:
- ivo://CDS.VizieR/J/A+A/512/A46
- Title:
- Radial velocities of BD-08 2823
- Short Name:
- J/A+A/512/A46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the detection of a planetary system around BD-08 2823, that includes at least one Uranus-mass planet and one Saturnmass planet. This discovery serendipitously originates from a search for planetary transits in the Hipparcos photometry database. This program preferentially selected active stars and did not allow the detection of new transiting planets. It allowed however the identification of the K3V star BD-08 2823 as a target harboring a multiplanet system, that we secured and characterized thanks to an intensive monitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellar activity level of BD-08 2823 complicates the analysis but does not prohibit the detection of two planets around this star. BD-08 2823b has a minimum mass of 14.4+/-2.1M_{earth}_ and an orbital period of 5.60days, whereas BD-08 2823c has a minimum mass of 0.33+/-0.03M_{Jup}_ and an orbital period of 237.6days. This new system strengthens the fact that low-mass planets are preferentially found in multiplanetary systems, but not around high-metallicity stars as this is the case for massive planets. It also supports the belief that active stars should not be neglected in exoplanet searches, even when searching for low-mass planets.
- ID:
- ivo://CDS.VizieR/J/A+A/512/A45
- Title:
- Radial velocities of BD+20 1790
- Short Name:
- J/A+A/512/A45
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- BD+20 1790 is a young active, metal-rich, late-type K5Ve star. We have undertaken a study of stellar activity and kinematics for this star over the past few years. Previous results show a high level of stellar activity, with the presence of prominence-like structures, spots on the surface, and strong flare events, despite the moderate rotational velocity of the star. In addition, radial velocity variations with a semi-amplitude of up to 1km/s were detected. We investigate the nature of these radial velocity variations, in order to determine whether they are due to stellar activity or the reflex motion of the star induced by a companion.
- ID:
- ivo://CDS.VizieR/J/A+A/613/A47
- Title:
- Radial velocities of 12 evolved stars
- Short Name:
- J/A+A/613/A47
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present radial velocities and line bisectors for 12 giants with high Li abundance. We report the discovery of two new planetary systems around HD238914 and TYC3318-01333-1, reveal a binary Li-rich giant HD181368. Although our current phase coverage is not complete, we suggest the presence of planetary mass companions around TYC3663-01966-1 and TYC3105-00152-1. We confirm the previous result for BD+48 740 (Adamow et al, 2012ApJ...754L..15A).
- ID:
- ivo://CDS.VizieR/J/ApJ/727/117
- Title:
- Radial velocities of four exoplanet candidates
- Short Name:
- J/ApJ/727/117
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new precise HIRES radial velocity (RV) data sets of five nearby stars obtained at Keck Observatory. HD 31253, HD 218566, HD 177830, HD 99492, and HD 74156 are host stars of spectral classes F through K and show RV variations consistent with new or additional planetary companions in Keplerian motion. The orbital parameters of the candidate planets in the five planetary systems span minimum masses of Msini=27.43M_{sun}_ to 8.28M_J_, periods of 17.05-4696.95 days and eccentricities ranging from circular to extremely eccentric (e~0.63). The fifth star, HD 74156, was known to have both a 52 day and a 2500 day planet, and was claimed to also harbor a third planet at 336 days, in apparent support of the "Packed Planetary System" hypothesis. Our greatly expanded data set for HD 74156 provides strong confirmation of both the 52 day and 2500 day planets, but strongly contradicts the existence of a 336 day planet, and offers no significant evidence for any other planets in the system.
- ID:
- ivo://CDS.VizieR/J/A+A/580/A14
- Title:
- Radial Velocities of 3 giant stars with planets
- Short Name:
- J/A+A/580/A14
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the discovery of two giant planets around the intermediate-mass evolved star HIP65891 and HIP107773. The best Keplerian fit to the HIP65891 and HIP107773 radial velocities leads to the following orbital parameters: P=1084.5d; Mpsini=6.0M_Jup_; e=0.13 and P=144.3d; Mpsini=2.0M_Jup_; e=0.09, respectively. In addition, we confirm the planetary nature of the outer object orbiting the giant star HIP67851. The orbital parameters of HIP67851c are: P=2131.8d, Mpsini=6.0M_Jup_, and e=0.17.