- ID:
- ivo://CDS.VizieR/J/AJ/154/273
- Title:
- New orbits for 18 binaries
- Short Name:
- J/AJ/154/273
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Orbital elements of 18 visual binaries are computed using the measurements collected in the Fourth Catalog of Interferometric Measurements of Binary Stars; 15 orbits are determined for the first time and three orbits are revised. Eleven of the binaries, denoted as HDS, were discovered during the Hipparcos mission. The remaining binaries were discovered a few years earlier or later than 1991. All studied pairs are close, and all measured separations are less than 0.46". The shortest orbital period is 10 years and the longest orbital period is 127 years. Dynamical parallaxes and total masses of systems are derived from the orbital elements. We also give absolute magnitudes, spectral types, and (O-C) residuals in {theta} and {rho}.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/ApJ/759/L41
- Title:
- New radial velocities of HD 97658
- Short Name:
- J/ApJ/759/L41
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The radial velocity-discovered exoplanet HD 97658b was recently announced to transit, with a derived planetary radius of 2.93+/-0.28R_{oplus}_. As a transiting super-Earth orbiting a bright star, this planet would make an attractive candidate for additional observations, including studies of its atmospheric properties. We present and analyze follow-up photometric observations of the HD 97658 system acquired with the Microvariability and Oscillations of STars space telescope. Our results show no transit with the depth and ephemeris reported in the announcement paper. For the same ephemeris, we rule out transits for a planet with radius larger than 2.09R_{oplus}_, corresponding to the reported 3{sigma} lower limit. We also report new radial velocity measurements which continue to support the existence of an exoplanet with a period of 9.5 days, and obtain improved orbital parameters.
- ID:
- ivo://CDS.VizieR/J/ApJ/794/143
- Title:
- New SpeX Observations of M7-L6 Dwarfs
- Short Name:
- J/ApJ/794/143
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Multiplicity is a key statistic for understanding the formation of very low mass (VLM) stars and brown dwarfs. Currently, the separation distribution of VLM binaries remains poorly constrained at small separations (<=1 AU), leading to uncertainty in the overall binary fraction. We approach this problem by searching for late-M/early-L plus T dwarf spectral binaries whose combined light spectra exhibit distinct peculiarities, allowing for separation-independent identification. We define a set of spectral indices designed to identify these systems, and we use a spectral template fitting method to confirm and characterize spectral binary candidates from a library of 815 spectra from the SpeX Prism Spectral Libraries. We present 11 new binary candidates, confirm 3 previously reported candidates, and rule out 2 previously identified candidates, all with primary and secondary spectral types in the range M7-L7 and T1-T8, respectively. We find that subdwarfs and blue L dwarfs are the primary contaminants in our sample and propose a method for segregating these sources. If confirmed by follow-up observations, these systems may add to the growing list of tight separation binaries, whose orbital properties may yield further insight into brown dwarf formation scenarios.
- ID:
- ivo://CDS.VizieR/J/MNRAS/429/2001
- Title:
- New transiting planet candidates from Kepler
- Short Name:
- J/MNRAS/429/2001
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have performed an extensive search for planet candidates in the publicly available Kepler long cadence data from quarters Q1 through Q6. The search method consists of initial de-trending of the data, applying the trend filtering algorithm, searching for transit signals with the Box Least Squares fitting method in three frequency domains, visual inspection of the potential transit candidates and an in-depth analysis of the shortlisted candidates. In this paper we present 150 new periodic planet candidates and seven single transit events, 72 of which are in multiple systems. The periods of these planet candidates vary from ~0.17 to ~440d. 124 of the planet candidates have radii smaller than 3R_{earth}_. We recover 82.5 per cent of the Batalha et al. (2012, Cat. J/ApJS/204/24). Kepler Objects of Interest (KOI) catalogue. We also report 40 newly identified false positives - systems that look like transiting planets, but are probably due to blended eclipsing binaries. Our search improves the statistics in the short-period and small-planet radii parameter ranges.
- ID:
- ivo://CDS.VizieR/J/AJ/142/84
- Title:
- 10 new transit light curves of HAT-P-13b
- Short Name:
- J/AJ/142/84
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 10 new transit light curves of the transiting hot Jupiter HAT-P-13b, obtained during two observational seasons by three different telescopes. When combined with 12 previously published light curves, we have a sample consisting of 22 transit light curves, spanning 1041 days across four observational seasons. We use this sample to examine the recently observed large-amplitude transit timing variations (TTVs) by Pal et al. (2011MNRAS.413L..43P) and give refined system parameters. We find that the transit times are consistent with a linear ephemeris, with the exception of a single transit time, from UT 2009 November 5, for which the measured mid-transit time significantly deviates from our linear ephemeris. The nature of this deviation is not clear, and the rest of the data do not show any significant TTVs.
- ID:
- ivo://CDS.VizieR/J/A+A/539/A28
- Title:
- New transit photometry for super-Earth 55 Cnc e
- Short Name:
- J/A+A/539/A28
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5um. An individual analysis of these new data leads to a planet radius of 2.21^+0.15^_-0.16_R_{earth}_, in good agreement with the values previously derived from the MOST and Spitzer transit discovery data. A global analysis of both Spitzer transit time-series improves the precision on the radius of the planet at 4.5um to 2.20+/-0.12R_{earth}_. We also performed an independent analysis of the MOST data, paying particular attention to the influence of the systematic effects of instrumental origin on the derived parameters and errors by including them in a global model instead of performing a preliminary detrending-filtering processing. We deduce from this reanalysis of MOST data an optical planet radius of 2.04+/-0.15R_{earth}_ that is consistent with our Spitzer infrared radius
- ID:
- ivo://CDS.VizieR/J/other/JDSO/6.30
- Title:
- New Wide Common Proper Motion Binaries
- Short Name:
- J/other/JDSO/6.3
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this work we report the discovery of 150 new double stars of which 142 are wide common proper motion stellar systems. In addition to this, we report the study of 23 recently catalogued wide common proper motion binaries discovered by other observers. Spectral types, photometric distances, kinematics and ages were determined from data obtained consulting the literature. Several criteria were used to determine the nature of each double star. Orbital periods and the semimajor axes were calculated.
- ID:
- ivo://CDS.VizieR/J/A+A/472/577
- Title:
- NGC 330 Be stars and binaries
- Short Name:
- J/A+A/472/577
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Observations of hot stars belonging to the young cluster SMC-NGC 330 and its surrounding region were obtained with the VLT-GIRAFFE facilities in MEDUSA mode. We investigated the B and Be star properties and proportions in this environment of low metallicity. We also searched for rapid variability in Be stars using photometric databases. Using spectroscopic measurements, we characterized the emission and properties of Be stars. By cross-correlation with photometric databases such as MACHO and OGLE, we searched for binaries in our sample of hot stars, as well as for short-term variability in Be stars. We report on the global characteristics of the Be star sample.
- ID:
- ivo://CDS.VizieR/J/A+AS/126/273
- Title:
- Nice double star measurements
- Short Name:
- J/A+AS/126/273
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the last observations from two lists: General program and MLR pairs, made with the 50cm refractor of Nice Observatory.
- ID:
- ivo://CDS.VizieR/J/AJ/126/1665
- Title:
- NICMOS observations of NGC 2024
- Short Name:
- J/AJ/126/1665
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an analysis of NICMOS observations of the embedded cluster associated with NGC 2024. An analysis of the cluster color-magnitude diagram (CMD) using the models of D'Antona & Mazzitelli and Baraffe et al. (published in 1997MmSAI..68..807D and 1998, Cat. <J/A+A/337/403>, respectively) indicates that the ratio of intermediate-mass (1.0-10.0M_{sun}_) to low-mass (0.1-1.0M_{sun}_) stars is consistent with the stellar initial mass function (IMF) for the field. In addition to the CMD analysis, we present results on the multiplicity of stars in the region. Three companions (in a sample of 95 potential primaries) were found, with angular separations between 0.4" and 1.0", translating to a projected linear separation of 184-460AU for an estimated distance of 460pc. The completeness of binary detections is assessed using recovery fractions calculated by a series of tests using artificially generated companions to potential primaries in the data frames. We find that the binary fraction in NGC 2024 is consistent with that of Duquennoy & Mayor (published in 1991A&A...248..485D) for solar neighborhood stars over the range of separations and companion masses appropriate for our survey.
