- ID:
- ivo://CDS.VizieR/J/A+A/646/A131
- Title:
- Four Jovian planets RV and activity indexes
- Short Name:
- J/A+A/646/A131
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of planetary companions orbiting four low-luminosity giant stars with M* between 1.04 and 1.39M_{sun}_. All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS (EXPRESS) program and the Pan-Pacific Planet Search (PPPS). The companion signals were revealed by multi-epoch precision radial velocities obtained in nearly a decade. The planetary companions exhibit orbital periods between ~1.2 and 7.1 years, minimum masses of m_p_*sini~1.8-3.7M_Jup_, and eccentricities between 0.08 and 0.42. With these four new systems, we have detected planetary companions to 11 out of the 37 giant stars that are common targets in the EXPRESS and PPPS. After excluding four compact binaries from the common sample, we obtained a fraction of giant planets (m_p_~1-2M_Jup_) orbiting within 5AU from their parent star of f=33.3^+9.0^_-7.1_%. This fraction is slightly higher than but consistent at the 1{sigma} level with previous results obtained by different radial velocity surveys. Finally, this value is substantially higher than the fraction predicted by planet formation models of gas giants around stars more massive than the Sun.
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Search Results
- ID:
- ivo://CDS.VizieR/J/AJ/156/140
- Title:
- Four new eclipsing mid M-dwarf systems from MEarth
- Short Name:
- J/AJ/156/140
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using data from the MEarth-North and MEarth-South transit surveys, we present the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP 796-24, and LP 991-15. Combining the MEarth photometry with spectroscopic follow-up observations, we show that LP 107-25 and LP 796-24 are short-period (1.388 and 0.523 day, respectively) eclipsing binaries in triple-lined systems with substantial third-light contamination from distant companions. LP 261-75 is a short-period (1.882 day) single-lined system consisting of a mid M-dwarf eclipsed by a probable brown dwarf secondary, with another distant visual brown dwarf companion. LP 991-15 is a long-period (29.3 day) double-lined eclipsing binary on an eccentric orbit with a geometry that produces only primary eclipses. A spectroscopic orbit is given for LP 991-15, and initial orbits for LP 107-25 and LP 261-75.
- ID:
- ivo://CDS.VizieR/J/A+A/572/A93
- Title:
- Four new transiting planets
- Short Name:
- J/A+A/572/A93
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The characterization of four new transiting extrasolar planets is presented here. KOI-188b and KOI-195b are bloated hot Saturns, with orbital periods of 3.8 and 3.2-days, and masses of 0.25 and 0.34M_Jup_, respectively. They are located in the low-mass range of known transiting, giant planets. KOI-192b has a similar mass (0.29M_Jup_) but a longer orbital period of 10.3 days. This places it in a domain where only few planets are known. KOI-830b, finally, with a mass of 1.27M_Jup_ and a period of 3.5-days, is a typical hot Jupiter. The four planets have radii of 0.98, 1.09, 1.2, and 1.08R_Jup_, respectively. We detected no significant eccentricity in any of the systems, while the accuracy of our data does not rule out possible moderate eccentricities. The four objects were first identified by the Kepler Team as promising candidates from photometry of the Kepler satellite. We establish here their planetary nature thanks to the radial velocity follow-up we secured with the HARPS-N spectrograph at the Telescopio Nazionale Galileo. The combined analyses of the whole datasets allow us to fully characterize the four planetary systems. These new objects increase the number of well-characterized exoplanets for statistics, and provide new targets for individual follow-up studies. The pre-screening we performed with the SOPHIE spectrograph at the Observatoire de Haute-Provence as part of that study also allowed us to conclude that a fifth candidate, KOI-219.01, is not a planet but is a false positive.
- ID:
- ivo://CDS.VizieR/J/A+A/549/A134
- Title:
- Four new WASP transiting close-in giant planets
- Short Name:
- J/A+A/549/A134
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the discovery of four new transiting hot jupiters, detected mainly from SuperWASP-North and SOPHIE observations. These new planets, WASP-52b, WASP-58b, WASP-59b, and WASP-60b, have orbital periods ranging from 1.7 to 7.9-days, masses between 0.46 and 0.94M_Jup_, and radii between 0.73 and 1.49 R_Jup_.
- ID:
- ivo://CDS.VizieR/J/A+A/377/801
- Title:
- Fourth list of the Karachentsev catalog
- Short Name:
- J/A+A/377/801
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper presents HI observations of 165 dwarf galaxy candidates from the Karachentsev catalog of candidates for nearby dwarf galaxies prepared from film copies of POSSII and the ESO/SERC southern extension. Now a total of 601 galaxies from the published Karachentsev catalog have been searched for HI emission. Table 1 lists coordinates and general optical properties while Table 2 presents HI data and some global properties of these galaxies.
- ID:
- ivo://CDS.VizieR/J/AJ/110/1699
- Title:
- F-P observations of globular clusters
- Short Name:
- J/AJ/110/1699
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the Rutgers Imaging Fabry-Perot Spectrophotometer on the CTIO 4-m telescope, we have measured radial velocities for 548 stars in 47 Tuc (NGC 104), 128 stars in NGC 6397, and 132 stars in M30 (NGC 7099), with uncertainties between 0.5 and 5km/s. In 47 Tuc and NGC 6397, the dispersion profiles at first increase with decreasing radii but then flatten in the central 0.4'. This is the same behavior seen in our previously published profile for M15. The measured stellar velocities show that 47 Tuc is rotating, with a projected rotation axis that is aligned with the isophotal minor axis. We also find a similar alignment for the rotation that we previously measured in M15. A map of the average velocity in the central regions derived from the integrated light shows rotation for NGC 6397 and 47 Tuc. For 47 Tuc, NGC 6397, and M15, the amplitude of the projected rotation measured at a radius of 0.6' using the individual stellar velocities is equal to, or smaller than, that measured at a radius of 0.2' using the integrated light. This is not consistent with the solid-body rotation usually assumed for the inner regions. To study further the form of the projected rotation we have used two-dimensional spline smoothing to derive a mean velocity map for 47 Tuc using the individual stellar velocities. This map shows that the projected rotation velocity reaches a plateau at a radius of 3' and that the radial dependence of the projected rotation velocity deviates significantly from solid body beyond 2'. We have repeat measurements of the two "high-velocity" stars of Meylan, Dubath, and Mayor. However, we detect more stars with similar large offsets from the cluster mean velocity. The number of stars that we measure with large velocity offsets is consistent with a normal distribution, so that there is no need to invoke a special creation mechanism for these stars.
- ID:
- ivo://CDS.VizieR/J/ApJS/224/41
- Title:
- Frequency spacing of {delta} Scuti stars. II.
- Short Name:
- J/ApJS/224/41
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A sequence search method was developed for searching for regular frequency spacing in {delta} Scuti stars by visual inspection (VI) and algorithmic search. The sample contains 90 {delta} Scuti stars observed by CoRoT. An example is given to represent the VI. The algorithm (SSA) is described in detail in section 3.2. The data treatment of the CoRoT light curves, the criteria for frequency filtering, and the spacings derived by two methods (i.e., three approaches: VI, SSA, and FT (Fourier Transform)) are given for each target. Echelle diagrams are presented for 77 targets for which at least one sequence of regular spacing was identified. Comparing the spacing and the shifts between pairs of echelle ridges revealed that at least one pair of echelle ridges is shifted to midway between the spacing for 22 stars. The estimated rotational frequencies compared to the shifts revealed rotationally split doublets, triplets, and multiplets not only for single frequencies, but for the complete echelle ridges in 31 {delta} Scuti stars. Using several possible assumptions for the origin of the spacings, we derived the large separation ({Delta}_nu_) that are distributed along the mean density versus large separations relation derived from stellar models.
- ID:
- ivo://CDS.VizieR/J/other/AstBu/74.62
- Title:
- Fundamental parameters of CP stars
- Short Name:
- J/other/AstBu/74
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The paper presents the results of determination of fundamental parameters (effective temperature, surface gravity, luminosity, mass, radius, rotation velocity, and radial velocity) for 146 stars observed at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the Main Stellar Spectrograph during 2009-2011; 124 of the stars are magnetic or potentially magnetic objects. We obtained and analyzed at least 500 pairs of circularly-polarized-emission spectra. Various methods and approaches were used in estimating the fundamental parameters.
- ID:
- ivo://CDS.VizieR/J/A+A/476/217
- Title:
- Fundamental parameters of five old open clusters
- Short Name:
- J/A+A/476/217
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The outer parts of the Milky Way disk are believed to be one of the main arenas where the accretion of external material in the form of dwarf galaxies and subsequent formation of streams is taking place. The Monoceros stream and the Canis Major and Argo over-densities are notorious examples. Understanding whether what we detect is the signature of accretion or, more conservatively, simply the intrinsic nature of the disk, represents one of the major goals of modern Galactic astronomy. We try to shed more light on the properties of the outer disk by exploring the properties of distant anti-center old open clusters. We want to verify whether distant clusters follow the chemical and dynamical behavior of the solar vicinity disk, or whether their properties can be better explained in terms of an extra-galactic population.
- ID:
- ivo://CDS.VizieR/J/ApJ/765/2
- Title:
- FUV radial velocities of 59 Cyg
- Short Name:
- J/ApJ/765/2
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on the detection of a hot subdwarf component in the Be binary system, 59 Cygni. The spectral signature is found in cross-correlation functions of photospheric model spectra with far-ultraviolet spectra obtained by the International Ultraviolet Explorer Satellite, and we used radial velocities from the cross-correlation functions to determine a double-lined spectroscopic orbit. The individual spectra of the binary components were extracted using a Doppler tomography algorithm. The flux of the system is dominated by the rapidly rotating Be star. However, the subdwarf contributes approximately 4% of the UV flux, and its spectrum bears a strong resemblance to that of the hot sdO star BD +75{deg}325. Based on the appearance of the UV spectrum and the orbital elements, we present estimates for the stellar masses, radii, and temperatures. The presence of the hot companion causes excess emission from the outer part of the Be disk facing the companion. We present a set of red spectra that show the orbital phase variations of the He I {lambda}6678 emission formed in the heated region of the disk, which probably occurs near the disk outer boundary. 59 Cygni, FY Canis Majoris, and {phi} Persei comprise the known set of Be binaries with detected hot evolved companions, which are the stripped down remains of mass transfer. Their properties demonstrate that some fraction of Be stars were spun up through angular momentum transfer by Roche lobe overflow.