- ID:
- ivo://CDS.VizieR/J/MNRAS/370/1181
- Title:
- Library of Lick/IDS indices for binaries
- Short Name:
- J/MNRAS/370/1181
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using evolutionary population synthesis, we present 13 refined absorption-line indices defined by the Lick Observatory Image Dissector Scanner (Lick/IDS) system for an extensive set of instantaneous-burst binary stellar populations (BSPs) at high resolution (~0.3{AA}), and 38 indices at intermediate resolution (3{AA}). The ages of the populations are at an interval of 1Gyr in the range 115 Gyr, and the metallicities are in the range 0.004-0.03. These indices are obtained by two methods: (i) using the empirical fitting functions (FFs method); (ii) measured directly from the synthetic spectra (DC method). Together with our previous paper, a data base of Lick/IDS spectral absorption-line indices for BSPs at high and intermediate resolutions is provided. This set of indices includes 21 indices of Worthey et al. (1994, Cat. <J/ApJS/94/687>), four Balmer indices defined by Worthey & Ottaviani (1997, Cat. <J/ApJS/111/377>), and 13 indices with the new passband definitions of Trager et al. (1998, Cat. <J/ApJS/116/1>, hereafter T98.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/623/A114
- Title:
- Light curve of K2-292 (HD 119130)
- Short Name:
- J/A+A/623/A114
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the discovery and characterisation of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17-d orbit around a bright (V=9.9mag) solar-like G3 V star with a mass and radius of Ms=1.00+/-0.03M_{sun}_ and Rs=1.09+/-0.03R_{sun}_ respectively. We model simultaneously the K2 photometry and CARMENES spectroscopic data and derive a radius of Rp=2.63_-0.10+^+0.12^R_{earth}_ and mass of Mp=24.5_-4.4_^+4.4^M_{earth}_, yielding a mean density of 7.4_-1.5_^+1.6^g/cm^3^, which makes it one of the densest sub-Neptune planets known to date. We also detect a linear trend in radial velocities of HD 119130 that suggests a long-period companion with a minimum mass on the order of 33M_{earth}_. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.
- ID:
- ivo://CDS.VizieR/J/ApJ/718/1353
- Title:
- Light curve of the triple system NLTT 41135
- Short Name:
- J/ApJ/718/1353
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of an eclipsing companion to NLTT 41135, a nearby M5 dwarf that was already known to have a wider, slightly more massive common proper motion companion, NLTT 41136, at 2.4" separation. Analysis of combined-light and RV curves of the system indicates that NLTT 41135B is a (31-34)+/-3M_Jup_ brown dwarf (where the range depends on the unknown metallicity of the host star) on a circular orbit. The visual M dwarf pair appears to be physically bound, so the system forms a hierarchical triple, with masses approximately in the ratio 8:6:1. The eclipses are grazing, preventing an unambiguous measurement of the secondary radius, but follow-up observations of the secondary eclipse (e.g., with the James Webb Space Telescope) could permit measurements of the surface brightness ratio between the two objects, and thus place constraints on models of brown dwarfs.
- ID:
- ivo://CDS.VizieR/J/A+A/633/A30
- Title:
- Light curves and RVs of WASP-174
- Short Name:
- J/A+A/633/A30
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The transiting exoplanetary system WASP-174 was reported to be composed by a main-sequence F star and a giant planet, WASP-174b. However only an upper limit was placed on the planet mass, and a highly uncertain planetary radius was determined. We aim to better characterise both the star and the planet and precisely measure their orbital and physical parameters. In order to constrain the mass of the planet, we obtained new measurements of the radial velocity of the star and joined them with those from the discovery paper. Photometric data Q1 from the HATSouth survey and new multi-band, high-quality (precision reached up to 0.37mmag) photometric follow-up observations of transit events were acquired and analysed for getting accurate photometric parameters. We fit the model to all the observations, including data from the TESS space telescope, in two different modes: incorporating the stellar isochrones into the fit, and using an empirical method to get the stellar parameters. The two modes resulted to be consistent with each other. We confirm the grazing nature of the WASP-174b transits, which is also corroborated by simultaneously observing the transit through four optical bands and noting how the transit depth changes due to the limb-darkening effect. We estimate that 76% of the disk of the planet actually eclipses the parent star at mid-transit of its transit events. We find that WASP-174b is a highly-inflated hot giant planet with a mass of 0.330M_Jup_ and a radius of 1.435R_Jup_, and is therefore a good target for transmission-spectroscopy observations. With a density of 0.135g/cm^3^, it is amongst the lowest-density planets ever discovered with precisely measured mass and radius.
- ID:
- ivo://CDS.VizieR/J/A+A/559/A32
- Title:
- Light curves of GJ3470b
- Short Name:
- J/A+A/559/A32
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- GJ3470b is a rare example of a "hot Uranus" transiting exoplanet orbiting a nearby M1.5 dwarf. It is crucial for atmospheric studies because it is one of the most inflated low-mass planets known, bridging the boundary between "super-Earths" and Neptunian planets. We present two new ground-based light curves of GJ3470b gathered by the LBC camera at the Large Binocular Telescope. Simultaneous photometry in the ultraviolet ({lambda}_c_=357.5nm) and optical infrared ({lambda}_c_=963.5nm) allowed us to detect a significant change in the effective radius of GJ3470b as a function of wavelength. This can be interpreted as a signature of scattering processes occurring in the planetary atmosphere, which should be cloud-free and with a low mean molecular weight. The unprecedented accuracy of our measurements demonstrates that the photometric detection of Earth-sized planets around M dwarfs is achievable using 8-10m size ground-based telescopes. We provide updated planetary parameters and a greatly improved orbital ephemeris for any forthcoming study of this planet.
- ID:
- ivo://CDS.VizieR/J/A+A/551/A11
- Title:
- Light curves of HAT-P-8
- Short Name:
- J/A+A/551/A11
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The extrasolar planet HAT-P-8 b was thought to be one of the more inflated transiting hot Jupiters. Aims. By using new and existing photometric data, we computed precise estimates of the physical properties of the system. Methods. We present photometric observations comprising eleven light curves covering six transit events, obtained using five medium-class telescopes and telescope-defocussing technique. One transit was simultaneously obtained through four optical filters, and two transits were followed contemporaneously from two observatories. We modelled these and seven published datasets using the jktebop code. The physical parameters of the system were obtained from these results and from published spectroscopic measurements. In addition, we investigated the theoretically-predicted variation of the apparent planetary radius as a function of wavelength, covering the range 330-960nm. Results. We find that HAT-P-8 b has a significantly lower radius (1.321R_Jup_) and mass (1.275M_Jup_) compared to previous estimates (1.50R_Jup_ and 1.52M_Jup_ respectively). We also detect a radius variation in the optical bands that, when compared with synthetic spectra of the planet, may indicate the presence of a strong optical absorber, perhaps TiO and VO gases, near the terminator of HAT-P-8 b. Conclusions. These new results imply that HAT-P-8 b is not significantly inflated, and that its position in the planetary mass-radius diagram is congruent with those of many other transiting extrasolar planets.
- ID:
- ivo://CDS.VizieR/J/A+A/532/A24
- Title:
- Light curves of HAT-P-13b
- Short Name:
- J/A+A/532/A24
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- TASTE (The Asiago Search for Transit timing variations of Exoplanets) project is collecting high-precision, short-cadence light curves for a selected sample of transiting exoplanets. It has been claimed that the hot jupiter HAT-P-13b suddenly deviated from a linear ephemeris by ~20min, implying that there is a perturber in the system. Using five new transits, we discuss the plausibility of this transit time variation (TTV), and show that a periodic signal should not be excluded. More follow-up observations are required to constrain the mass and the orbit of the hypothetical perturber.
- ID:
- ivo://CDS.VizieR/J/A+A/527/A85
- Title:
- Light curves of HAT-P-3b and HAT-P-14b
- Short Name:
- J/A+A/527/A85
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A promising method for detecting earth-sized exoplanets is the timing analysis of a known transit. The technique allows a search for variations in either the transit duration or the center induced by the perturbation of a third body, e.g. a second planet or an exomoon. By applying this method, the TASTE (The Asiago Search for Transit Timing variations of Exoplanets) project will collect high- precision, short-cadence light curves for a selected sample of transits by using imaging differential photometry at the Asiago 1.82m telescope. The first light curves show that our project can achieve a competitive timing accuracy, as well as a significant improvement of the orbital parameters. We derived refined ephemerides for HAT-P-3b and HAT-P-14b with a timing accuracy of 11 and 25s, respectively.
- ID:
- ivo://CDS.VizieR/J/ApJ/754/136
- Title:
- Light curves of HD 149026b in 3.6-16um
- Short Name:
- J/ApJ/754/136
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The dayside of HD 149026b is near the edge of detectability by the Spitzer Space Telescope. We report on 11 secondary-eclipse events at 3.6, 4.5, 3x5.8, 4x8.0, and 2x16{mu}m plus three primary-transit events at 8.0{mu}m. The eclipse depths from jointly fit models at each wavelength are 0.040%+/-0.003% at 3.6{mu}m, 0.034%+/-0.006% at 4.5{mu}m, 0.044%+/-0.010% at 5.8{mu}m, 0.052%+/-0.006% at 8.0{mu}m, and 0.085%+/-0.032% at 16{mu}m. Multiple observations at the longer wavelengths improved eclipse-depth signal-to-noise ratios by up to a factor of two and improved estimates of the planet-to-star radius ratio (R_p_/R_{sstarf}_=0.0518+/-0.0006). We also identify no significant deviations from a circular orbit and, using this model, report an improved period of 2.8758916+/-0.0000014 days. Chemical-equilibrium models find no indication of a temperature inversion in the dayside atmosphere of HD 149026b. Our best-fit model favors large amounts of CO and CO_2_, moderate heat redistribution (f=0.5), and a strongly enhanced metallicity. These analyses use BiLinearly-Interpolated Subpixel Sensitivity (BLISS) mapping, a new technique to model two position-dependent systematics (intrapixel variability and pixelation) by mapping the pixel surface at high resolution. BLISS mapping outperforms previous methods in both speed and goodness of fit. We also present an orthogonalization technique for linearly correlated parameters that accelerates the convergence of Markov chains that employ the Metropolis random walk sampler.
- ID:
- ivo://CDS.VizieR/J/MNRAS/443/2391
- Title:
- Light curves of Qatar-2 transit events
- Short Name:
- J/MNRAS/443/2391
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 17 high-precision light curves of five transits of the planet Qatar-2 b, obtained from four defocused 2m-class telescopes. Three of the transits were observed simultaneously in the Sloan g'r'i'z' passbands using the seven-beam Gamma Ray Burst Optical and Near-Infrared Detector imager on the MPG/ESO 2.2m telescope. A fourth was observed simultaneously in Gunn grz using the Centro Astronomico Hispano Aleman 2.2m telescope with Bonn University Simultaneous Camera, and in r using the Cassini 1.52m telescope. Every light curve shows small anomalies due to the passage of the planetary shadow over a cool spot on the surface of the host star. We fit the light curves with the prism+gemc model to obtain the photometric parameters of the system and the position, size and contrast of each spot. We use these photometric parameters and published spectroscopic measurements to obtain the physical properties of the system to high precision, finding a larger radius and lower density for both star and planet than previously thought. By tracking the change in position of one star-spot between two transit observations, we measure the orbital obliquity of Qatar-2b to be lambda=4.3{deg}+/-4.5{deg}, strongly indicating an alignment of the stellar spin with the orbit of the planet. We calculate the rotation period and velocity of the cool host star to be 11.5+/-0.2d and 3.28+/-0.04km/s at a colatitude of 74{deg}. We assemble the planet's transmission spectrum over the 386-976 nm wavelength range and search for variations of the measured radius of Qatar-2 b as a function of wavelength. Our analysis highlights a possible H_2_/He Rayleigh scattering in the blue.
