- ID:
- ivo://CDS.VizieR/J/MNRAS/510/3102
- Title:
- PN Ou5 gri and RV curves
- Short Name:
- J/MNRAS/510/3102
- Date:
- 19 Jan 2022 08:33:22
- Publisher:
- CDS
- Description:
- We present a detailed study of the stellar and orbital parameters of the post-common envelope binary central star of the planetary nebula Ou5. Low-resolution spectra obtained during the primary eclipse - to our knowledge the first isolated spectra of the companion to a post-common-envelope planetary nebula central star - were compared to catalogue spectra, indicating that the companion star is a late K- or early M-type dwarf. Simultaneous modelling of multi-band photometry and time-resolved radial velocity measurements was then used to independently determine the parameters of both stars as well as the orbital period and inclination. The modelling indicates that the companion star is low mass (~0.25M_{sun}_) and has a radius significantly larger than would be expected for its mass. Furthermore, the effective temperature and surface gravity of nebular progenitor, as derived by the modelling, do not lie on single-star post-AGB evolutionary tracks, instead being more consistent with a post-RGB evolution. However, an accurate determination of the component masses is challenging. This is principally due to the uncertainty on the locus of the spectral lines generated by the irradiation of the companion's atmosphere by the hot primary (used to derive companion star's radial velocities), as well as the lack of radial velocities of the primary.
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- ID:
- ivo://CDS.VizieR/J/A+A/616/A39
- Title:
- Power-2 limb-darkening law from STAGGER-grid
- Short Name:
- J/A+A/616/A39
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Inaccurate limb-darkening models can be a significant source of error in the analysis of the light curves for transiting exoplanet and eclipsing binary star systems, particularly for high-precision light curves at optical wavelengths. The power-2 limb-darkening law, I_{lambda}_({mu})=1-c(1-{mu}^{alpha}^), has recently been proposed as a good compromise between complexity and precision in the treatment of limb-darkening. My aim is to develop a practical implementation of the power-2 limb-darkening law and to quantify the accuracy of this implementation. I have used synthetic spectra based on the 3D stellar atmosphere models from the Stagger-grid to compute the limb- darkening for several passbands (UBVRI, CHEOPS, TESS, Kepler, etc.). The parameters of the power-2 limb-darkening laws are optimized using a least-squares fit to a simulated light curve computed directly from the tabulated I_{lambda}_({mu}) values. I use the transformed parameters h_1_=1-c(1-2^(-{alpha})^) and h_2_=c2^(-{alpha}^) to directly compare these optimized limb-darkening parameters to the limb darkening measured from Kepler light curves of 16 transiting exoplanet systems. The posterior probability distributions (PPDs) of the transformed parameters h_1_ and h_2_ resulting from the light curve analysis are found to be much less strongly correlated than the PPDs for c and {alpha}. The agreement between the computed and observed values of (h_1_, h_2_) is generally very good but there are significant differences between the observed and computed values for Kepler-17, the only star in the sample that shows significant variability between the eclipses due to magnetic activity (star spots). The tabulation of h_1_ and h_2_ provided here can be used to accurately model the light curves of transiting exoplanets. I also provide estimates of the priors that should be applied to transformed parameters h_1_ and h_2_ based on my analysis of the Kepler light curves of 16 stars transiting exoplanets.
- ID:
- ivo://CDS.VizieR/J/AJ/135/850
- Title:
- Properties of eclipsing binaries found in TrES
- Short Name:
- J/AJ/135/850
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In recent years, we have witnessed an explosion of photometric time-series data, collected for the purpose of finding a small number of rare sources, such as transiting extrasolar planets and gravitational microlenses. Once combed, these data are often set aside, and are not further searched for the many other variable sources that they undoubtedly contain. To this end, we describe a pipeline that is designed to systematically analyze such data, while requiring minimal user interaction. We ran our pipeline on a subset of the Trans-Atlantic Exoplanet Survey dataset, and used it to identify and model 773 eclipsing binary systems. For each system we conducted a joint analysis of its light curve, colors, and theoretical isochrones. This analysis provided us with estimates of the binary's absolute physical properties, including the masses and ages of their stellar components, as well as their physical separations and distances. We identified three types of eclipsing binaries that are of particular interest and merit further observations. The first category includes 11 low-mass candidates, which may assist current efforts to explain the discrepancies between the observation and the models of stars at the bottom of the main sequence. The other two categories include 34 binaries with eccentric orbits, and 20 binaries with abnormal light curves. Finally, this uniform catalog enabled us to identify a number of relations that provide further constraints on binary population models and tidal circularization theory.
- ID:
- ivo://CDS.VizieR/J/AJ/119/1389
- Title:
- Properties of the binary star FS Monocerotis
- Short Name:
- J/AJ/119/1389
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present photometric observations in B and V as well as spectroscopic observations of the 1.9 day-period, double-lined main-sequence eclipsing binary FS Mon. From the analysis of the light curves and radial velocity curves, we have determined the masses and radii of the components: 1.631+/-0.012 M_sun_ and 2.051+/-0.012 R_sun_ for the primary component; 1.461+/-0.010 M_sun_ and 1.629+/-0.012 R_sun_ for the secondary component. The formal uncertainties are all less than 1%. Based on our light curves as well as on the combined-light photometry of the system, we estimate effective temperatures of 6715+/-100 K for the primary and 6550+/-100 K for the secondary component, corresponding to spectral types of F2 and F4, respectively. Projected rotational velocities (v sin i) from the spectrograms are measured as 52+/-2 km.s^-1^ and 43+/-3 km.s^-1^, respectively, from the spectrograms and are consistent with rotation that is synchronous with the orbital motion.
- ID:
- ivo://CDS.VizieR/J/AJ/128/1840
- Title:
- Properties of the eclipsing binary star MU Cas
- Short Name:
- J/AJ/128/1840
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 6151 differential observations in the V filter measured by a robotic telescope, as well as 29 pairs of radial velocities from high-resolution spectroscopic observations, of the detached, EA-type, 9.65day period double-lined eclipsing binary star MU Cas.
- ID:
- ivo://CDS.VizieR/J/AJ/142/185
- Title:
- Properties of the eclipsing binary stars HY Vir
- Short Name:
- J/AJ/142/185
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- HY Vir is found to be a double-lined F0m+F5 binary star with relatively shallow (0.3mag) partial eclipses. Previous studies of the system are improved with 7509 differential photometric observations from the URSA WebScope and 8862 from the NFO (New Forest Observatory) WebScope, and 68 high-resolution spectroscopic observations from the Tennessee State University 2m automatic spectroscopic telescope, and the 1m coude-feed spectrometer at Kitt Peak National Observatory (KPNO). Very accurate (better than 0.5%) masses and radii are determined from analysis of the new light curves and radial velocity curves. Theoretical models match the absolute properties of the stars at an age of about 1.35Gy.
- ID:
- ivo://CDS.VizieR/J/AJ/128/1340
- Title:
- Properties of the eclipsing binary star V459 Cas
- Short Name:
- J/AJ/128/1340
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 5064 differential observations in the V filter measured by a robotic telescope, as well as 30 pairs of radial velocities from high-resolution spectroscopic observations, of the detached, EA-type, 8.46day period double-lined eclipsing binary star V459 Cas.
- ID:
- ivo://CDS.VizieR/J/AJ/128/1324
- Title:
- Properties of the eclipsing binary star V885 Cyg
- Short Name:
- J/AJ/128/1324
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 4179 differential observations in the V filter measured by a robotic telescope, as well as 25 pairs of radial velocities from high-resolution spectroscopic observations, of the detached, EB-type, 1.69day period double-lined eclipsing binary star V885 Cyg.
479. psi Cen light curves
- ID:
- ivo://CDS.VizieR/J/A+A/456/651
- Title:
- psi Cen light curves
- Short Name:
- J/A+A/456/651
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an extensive high-precision light curve of the bright star psi Centauri, obtained with the star tracker on board the WIRE satellite, which shows that this star is an eclipsing binary. We have obtained photometry from the SMEI instrument on board the Coriolis satellite, which together with the WIRE data allows us to determine the orbital period and photometric parameters of the eclipsing system. The WIRE light curve contains 41334 datapoints with a point-to-point scatter of 2mmag and a total length of 28.7days. The SMEI light curve contains 3448 datapoints with a point-to- point scatter of 20mmag and spas several observing seasons.
- 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.
