- ID:
- ivo://CDS.VizieR/J/ApJS/222/14
- Title:
- Planetary candidates from 1st yr K2 mission
- Short Name:
- J/ApJS/222/14
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Kepler Space Telescope is currently searching for planets transiting stars along the ecliptic plane as part of its extended K2 mission. We processed the publicly released data from the first year of K2 observations (Campaigns 0, 1, 2, and 3) and searched for periodic eclipse signals consistent with planetary transits. Out of the 59174 targets that we searched, we detect 234 planetary candidates around 208 stars. These candidates range in size from gas giants to smaller than the Earth, and range in orbital periods from hours to over a month. We conducted initial reconnaissance spectroscopy of 68 of the brighter candidate host stars, and present high-resolution optical spectra for these stars. We make all of our data products, including light curves, spectra, and vetting diagnostics available to users online.
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Search Results
1212. Planetary nebulae in M33
- ID:
- ivo://CDS.VizieR/J/ApJ/614/167
- Title:
- Planetary nebulae in M33
- Short Name:
- J/ApJ/614/167
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the results of a photometric and spectroscopic survey for planetary nebulae (PNs) over the entire body of the Local Group spiral galaxy M33. We use our sample of 152 PNs to show that the bright end of the galaxy's [OIII]{lambda}5007 planetary nebula luminosity function (PNLF) has the same sharp cutoff seen in other galaxies.
- ID:
- ivo://CDS.VizieR/J/AJ/131/2089
- Title:
- Planetary nebulae in NGC 3379 and NGC 3384
- Short Name:
- J/AJ/131/2089
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on observations of four early-type galaxies performed with the Rutgers Fabry-Perot in order to search for planetary nebulae (PNe) in these systems. The aim is to use the PNe as kinematic tracers of the galaxy potential. We describe our data reduction and analysis procedure and show that the proper calibration of our detection statistic is crucial in getting down to our limiting magnitude of m_5007_=26.1. In the case of the two Leo galaxies, we find moderately sized samples: 54 PNe in NGC 3379 and 50 PNe in NGC 3384; NGC 4636 (two PNe) and NGC 1549 (six PNe) are included for completeness. We present our samples in tabular form, as well as the spectrum for each PN.
- ID:
- ivo://CDS.VizieR/J/MNRAS/393/329
- Title:
- Planetary nebulae of NGC 4494
- Short Name:
- J/MNRAS/393/329
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new Planetary Nebula Spectrograph observations of the ordinary elliptical galaxy NGC 4494, resulting in positions and velocities of 255 planetary nebulae out to seven effective radii (25kpc). We also present new wide-field surface photometry from MMT/Megacam, and long-slit stellar kinematics from VLT/FORS2.
- ID:
- ivo://CDS.VizieR/J/A+AS/132/13
- Title:
- Planetary nebulae radial velocities
- Short Name:
- J/A+AS/132/13
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a compilation of radial velocities for 867 galactic planetary nebulae (Table 2.ps [postscript format] and Table2.dat [ascii format]).
- ID:
- ivo://CDS.VizieR/J/A+AS/125/289
- Title:
- Planetary nebulae radial velocities
- Short Name:
- J/A+AS/125/289
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The table lists the heliocentric radial velocities for planetary nebulae in the direction of the Galactic bulge. The accuracy is about 2km/s. The measurements were made in June and July 1993, using the ESO CAT with spectral resolution of 30000-60000. Halpha, [NII] 6548 and 6584 and [O III] 5007 were observed.
- ID:
- ivo://CDS.VizieR/J/ApJS/226/7
- Title:
- Planet candidates discovered using K2's 1st yr
- Short Name:
- J/ApJS/226/7
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 197 planet candidates discovered using data from the first year of the NASA K2 mission (Campaigns 0-4), along with the results of an intensive program of photometric analyses, stellar spectroscopy, high-resolution imaging, and statistical validation. We distill these candidates into sets of 104 validated planets (57 in multi-planet systems), 30 false positives, and 63 remaining candidates. Our validated systems span a range of properties, with median values of R_P_=2.3R_{Earth}_, P=8.6 days, Teff=5300K, and Kp=12.7mag. Stellar spectroscopy provides precise stellar and planetary parameters for most of these systems. We show that K2 has increased by 30% the number of small planets known to orbit moderately bright stars (1-4R_{Earth}_, Kp=9-13mag). Of particular interest are 76 planets smaller than 2R_{Earth}_, 15 orbiting stars brighter than Kp=11.5mag, 5 receiving Earth-like irradiation levels, and several multi-planet systems-including 4 planets orbiting the M dwarf K2-72 near mean-motion resonances. By quantifying the likelihood that each candidate is a planet we demonstrate that our candidate sample has an overall false positive rate of 15%-30%, with rates substantially lower for small candidates (<2R_{Earth}_) and larger for candidates with radii >8R_{Earth}_ and/or with P<3days. Extrapolation of the current planetary yield suggests that K2 will discover between 500 and 1000 planets in its planned four-year mission, assuming sufficient follow-up resources are available. Efficient observing and analysis, together with an organized and coherent follow-up strategy, are essential for maximizing the efficacy of planet-validation efforts for K2, TESS, and future large-scale surveys.
- ID:
- ivo://CDS.VizieR/J/A+A/620/A139
- Title:
- Planet candidates in open clusters
- Short Name:
- J/A+A/620/A139
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Detecting exoplanets in clusters of different ages is a powerful tool for understanding a number of open questions, such as how the occurrence rate of planets depends on stellar metallicity, on mass, or on stellar environment. We present the first results of our HARPS long-term radial velocity (RV) survey which aims to discover exoplanets around intermediate-mass (between ~2 and 6M_{sun}_) evolved stars in open clusters. We selected 826 bona fide HARPS observations of 114 giants from an initial list of 29 open clusters and computed the half-peak to peak variability of the HARPS RV measurements, namely {Delta}RV/2, for each target, to search for the best planet-host candidates. We also performed time series analyses for a few targets for which we have enough observations to search for orbital solutions. Although we attempted to rule out the presence of binaries on the basis of previous surveys, we detected 14 new binary candidates in our sample, most of them identified from a comparison between HARPS and CORAVEL data. We also suggest 11 new planet-host candidates based on a relation between the stellar surface gravity and {Delta}RV/2. Ten of the candidates are less than 3M_{sun}_, showing evidence of a low planet occurrence rate for massive stars. One of the planet-host candidates and one of the binary candidates show very clear RV periodic variations, allowing us to confirm the discovery of a new planet and to compute the orbital solution for the binary. The planet is IC 4651 9122b, with a minimum mass of msini=6.3M_J_ and a semimajor axis a=2.0AU. The binary companion is NGC 5822 201B, with a very low minimum mass of msini=0.11M_{sun}_ and a semimajor axis a=6.5AU, which is comparable to the Jupiter distance to the Sun.
- ID:
- ivo://CDS.VizieR/J/ApJ/697/544
- Title:
- Planets orbiting metal-poor dwarfs. II.
- Short Name:
- J/ApJ/697/544
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an analysis of three years of precision radial velocity (RV) measurements of 160 metal-poor stars observed with HIRES on the Keck 1 telescope. We report on variability and long-term velocity trends for each star in our sample. We identify several long-term, low-amplitude RV variables worthy of followup with direct imaging techniques. We place lower limits on the detectable companion mass as a function of orbital period. Our survey would have detected, with a 99.5% confidence level, over 95% of all companions on low-eccentricity orbits with velocity semiamplitude K>~100m/s, or M_p_sini>~3.0M_J_(P/yr)^(1/3)^, for orbital periods P<~3yr. None of the stars in our sample exhibits RV variations compatible with the presence of Jovian planets with periods shorter than the survey duration.
- ID:
- ivo://CDS.VizieR/J/A+A/335/183
- Title:
- Pleiades low-mass stars rotational velocities
- Short Name:
- J/A+A/335/183
- Date:
- 13 Dec 2021 10:00:41
- Publisher:
- CDS
- Description:
- We present new vsini measurements for 235 low-mass stars in the Pleiades. The differential rotational broadening has been resolved for all the stars in our sample. These results, combined with previously published measurements, provide a complete and unbiased rotation data set for stars in the mass range from 0.6 to 1.2M_{sun}_. Applying a numerical inversion technique on the vsini distributions, we derive the distributions of equatorial velocities for low-mass Pleiades members. We find that half of the Pleiades dwarfs with a mass between 0.6 to 1M_{sun}_ have rotation rates lower than 10km/s.
