- ID:
- ivo://CDS.VizieR/J/other/FrASS/8.624907
- Title:
- (Sub)Stellar companions of exoplanet hosts
- Short Name:
- J/other/FrASS/8.
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- We present the latest results of an ongoing multiplicity survey of exoplanet hosts, which was initiated at the Astrophysical Institute and University Observatory Jena, using data from the second data release of the ESA-Gaia mission. In this study the multiplicity of 289 targets was investigated, all located within a distance of about 500pc from the Sun. In total, 41 binary, and five hierarchical triple star systems with exoplanets were detected in the course of this project, yielding a multiplicity rate of the exoplanet hosts of about 16%. A total of 61 companions (47 stars, a white dwarf, and 13 brown dwarfs) were detected around the targets, whose equidistance and common proper motion with the exoplanet hosts were proven with their precise Gaia DR2 astrometry, which also agrees with the gravitational stability of most of these systems. The detected companions exhibit masses from about 0.016 up to 1.66M_{sun}_ and projected separations in the range between about 52 and 9555au.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/ApJ/610/1064
- Title:
- Substellar population of lambda Ori
- Short Name:
- J/ApJ/610/1064
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- By collecting optical and infrared photometry and low-resolution spectroscopy, we have identified a large number of low-mass stars and brown dwarf candidates belonging to the young cluster (~5Myr) associated with the binary star {lambda} Orionis. The lowest mass object found is an M8.5 with an estimated mass of 0.02M_{Sun}_ (~0.01M_{Sun}_ for objects without spectroscopic confirmation). For those objects with spectroscopy, the measured strength of the H{alpha} emission line follows a distribution similar to other clusters with the same age range, with larger equivalent widths for cooler spectral types.
- ID:
- ivo://CDS.VizieR/J/A+A/470/39
- Title:
- Substructures in WINGS clusters
- Short Name:
- J/A+A/470/39
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We search for and characterize substructures in the projected distribution of galaxies observed in the wide field CCD images of the 77 nearby clusters of the WIde-field Nearby Galaxy-cluster Survey (WINGS). This sample is complete in X-ray flux in the redshift range 0.04<z<0.07. We search for substructures in WINGS clusters with DEDICA, an adaptive-kernel procedure. We test the procedure on Monte-Carlo simulations of the observed frames and determine the reliability for the detected structures.
21044. S5 0716+714 UBVRI photometry
- ID:
- ivo://CDS.VizieR/J/A+A/402/151
- Title:
- S5 0716+714 UBVRI photometry
- Short Name:
- J/A+A/402/151
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- 4854 UBVRI photometric data on the BL Lacertae object S5 0716+71 taken from 8 Observatories in the period 1994-2001 are presented; a table for each optical band is given, containing the observation time, the source magnitude, the error on the source magnitude, and a label indicating the Observatory where the observation was done.
- ID:
- ivo://CDS.VizieR/J/A+A/629/A35
- Title:
- Succinonitrile and excited states spectroscopy
- Short Name:
- J/A+A/629/A35
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Dinitriles with a saturated hydrocarbon skeleton and a -CN group at each end can have large electric dipole moments. Their formation can be related to highly reactive radicals such as CH_2_CN, C_2_N or CN. Thus, these saturated dinitriles are potential candidates to be observed in the ISM. Our goal is the investigation of the rotational spectrum of one of the simplest dinitriles NC-CH_2_-CH_2_-CN, succinonitrile, whose actual rotational parameters are not precise enough to allow its detection it in the ISM. In addition, the rotational spectra for its vibrational excited states will be analyzed. The rotational spectra of succinonitrile was measured in the frequency range 72-116.5GHz using a new broadband millimeter-wave spectrometer based on radio astronomy receivers with Fast Fourier Transform backends. The identification of the vibrational excited states of succinonitrile was supported by high-level ab initio calculations on the harmonic and anharmonic force fields. A total of 459 rotational transitions with maximum values of J and Ka quantum numbers 70 and 14, respectively, were measured for the ground vibrational state of succinonitrile. The analysis allowed us to accurately determine the rotational, quartic and sextic centrifugal distortion constants. Up to eleven vibrational excited states, resulted from the four lowest frequency vibrational modes nu13, nu12, nu24 and nu23 were identified. In addition to the four fundamental modes, we observed overtones together with some combination states. The rotational parameters for the ground state were employed to unsuccessfully search for succinonitrile in the cold and warm molecular clouds Orion KL, Sgr B2(N), B1-b and TMC-1,using the spectral surveys captured by IRAM 30m at 3mm and the Yebes 40m at 1.3cm and 7mm.
- ID:
- ivo://CDS.VizieR/J/A+A/579/A115
- Title:
- SUDARE-VOICE variability-selection of AGN
- Short Name:
- J/A+A/579/A115
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- One of the most peculiar characteristics of active galactic nuclei (AGNs) is their variability over all wavelengths. This property has been used in the past to select AGN samples and is foreseen to be one of the detection techniques applied in future multi-epoch surveys, complementing photometric and spectroscopic methods. In this paper, we aim to construct and characterise an AGN sample using a multi-epoch dataset in the r band from the SUDARE-VOICE survey. Our work makes use of the VST monitoring programme of an area surrounding the Chandra Deep Field South to select variable sources. We use data spanning a six-month period over an area of 2 square degrees, to identify AGN based on their photometric variability. The selected sample includes 175 AGN candidates with magnitude r<23mag. We distinguish different classes of variable sources through their lightcurves, as well as X-ray, spectroscopic, SED, optical, and IR information overlapping with our survey. We find that 12% of the sample (21/175) is represented by supernovae (SN). Of the remaining sources, 4% (6/154) are stars, while 66% (102/154) are likely AGNs based on the available diagnostics. We estimate an upper limit to the contamination of the variability selected AGN sample =~34%, but we point out that restricting the analysis to the sources with available multi-wavelength ancillary information, the purity of our sample is close to 80% (102 AGN out of 128 non-SN sources with multi-wavelength diagnostics). Our work thus confirms the efficiency of the variability selection method, in agreement with our previous work on the COSMOS field. In addition we show that the variability approach is roughly consistent with the infrared selection.
- ID:
- ivo://CDS.VizieR/J/A+A/584/A62
- Title:
- SUDARE VST-OmegaCAM search supernova rates
- Short Name:
- J/A+A/584/A62
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We describe the observing strategy, data reduction tools, and early results of a supernova (SN) search project, named SUDARE, conducted with the ESO VST telescope, which is aimed at measuring the rate of the different types of SNe in the redshift range 0.2<z<0.8. The search was performed in two of the best studied extragalactic fields, CDFS and COSMOS, for which a wealth of ancillary data are available in the literature or in public archives. We developed a pipeline for the data reduction and rapid identification of transients. As a result of the frequent monitoring of the two selected fields, we obtained light curve and colour information for the transients sources that were used to select and classify SNe by means of an especially developed tool. To accurately characterise the surveyed stellar population, we exploit public data and our own observations to measure the galaxy photometric redshifts and rest frame colours. We obtained a final sample of 117 SNe, most of which are SN Ia (57%) with the remaining ones being core collapse events, of which 44% are type II, 22% type IIn and 34% type Ib/c. To link the transients, we built a catalogue of ~1.3x10^5^ galaxies in the redshift range 0<z<=1, with a limiting magnitude K_AB_=23.5mag. We measured the SN rate per unit volume for SN Ia and core collapse SNe in different bins of redshifts. The values are consistent with other measurements from the literature. The dispersion of the rate measurements for SNe-Ia is comparable to the scatter of the theoretical tracks for single degenerate (SD) and double degenerate (DD) binary systems models, therefore it is not possible to disentangle among the two different progenitor scenarios. However, among the three tested models (SD and the two flavours of DD that either have a steep DDC or a wide DDW delay time distribution), the SD appears to give a better fit across the whole redshift range, whereas the DDC better matches the steep rise up to redshift ~1.2. The DDW instead appears to be less favoured. Unlike recent claims, the core collapse SN rate is fully consistent with the prediction that is based on recent estimates of star formation history and standard progenitor mass range.
21048. SuGOHI VI. List up to 2020
- ID:
- ivo://CDS.VizieR/J/A+A/642/A148
- Title:
- SuGOHI VI. List up to 2020
- Short Name:
- J/A+A/642/A148
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Strong lenses are extremely useful probes of the distribution of matter on galaxy and cluster scales at cosmological distances, but are rare and difficult to find. The number of currently known lenses is on the order of 1000. We wish to use crowdsourcing to carry out a lens search targeting massive galaxies selected from over 442 square degrees of photometric data from the Hyper Suprime-Cam (HSC) survey. We selected from the S16A internal data release of the HSC survey a sample of ~300000 galaxies with photometric redshifts in the range 0.2<zphot<1.2 and photometrically inferred stellar masses logM*>11.2. We crowdsourced lens finding on this sample of galaxies on the Zooniverse platform, as part of the Space Warps project. The sample was complemented by a large set of simulated lenses and visually selected non-lenses, for training purposes. Nearly 6000 citizen volunteers participated in the experiment. In parallel, we used YattaLens an automated lens finding algorithm, to look for lenses in the same sample of galaxies. Based on a statistical analysis of classification data from the volunteers, we selected a sample of the most promising ~1500 candidates which we then visually inspected: half of them turned out to be possible (grade C) lenses or better. Including lenses found by YattaLens or serendipitously noticed in the discussion section of the Space Warps website, we were able to find 14 definite lenses (grade A), 129 probable lenses (grade B) and 581 possible lenses. YattaLens found half the number of lenses discovered via crowdsourcing. Crowdsourcing is able to produce samples of lens candidates with high completeness and purity, compared to currently available automated algorithms. A hybrid approach, in which the visual inspection of samples of lens candidates pre-selected by discovery algorithms and/or coupled to machine learning is crowdsourced, will be a viable option for lens finding in the 2020s with forthcoming wide area surveys such as LSST, Euclid and WFIRST.
- ID:
- ivo://CDS.VizieR/J/A+A/610/A25
- Title:
- Sulamitis and Clarissa asteroids spectra
- Short Name:
- J/A+A/610/A25
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The low-inclination (i<80{deg}) primitive asteroid families in the inner main belt, that is, Polana-Eulalia, Erigone, Sulamitis, and Clarissa, are considered to be the most likely sources of near-Earth asteroids (101955) Bennu and (162173) Ryugu. These two primitive NEAs will be visited by NASA OSIRIS-REx and JAXA Hayabusa 2 missions, respectively, with the aim of collecting samples of material from their surfaces and returning them back to Earth. In this context, the Primitive Asteroid Spectroscopic Survey (PRIMASS) was born, with the main aim to characterize the possible origins of these NEAs and constrain their dynamical evolution. As part of the PRIMASS survey we have already studied the Polana and Erigone collisional families in previously published works. The main goal of the work presented here is to compositionally characterize the Sulamitis and Clarissa families using visible spectroscopy. We have observed 97 asteroids (64 from Sulamitis and 33 from Clarissa) with the OSIRIS instrument (0.5-0.9um) at the 10.4m Gran Telescopio Canarias (GTC). We found that about 60% of the sampled asteroids from the Sulamitis family show signs of aqueous alteration on their surfaces. We also found that the majority of the Clarissa members present no signs of hydration. The results obtained here show similarities between Sulamitis-Erigone, and Clarissa-Polana collisional families.
- ID:
- ivo://CDS.VizieR/J/A+A/655/A74
- Title:
- Sulfur ion irradiation experiments
- Short Name:
- J/A+A/655/A74
- Date:
- 10 Mar 2022 07:29:19
- Publisher:
- CDS
- Description:
- Sulfur (S) is of high interest in context of (astro)chemical evolution and habitability. However, the origin of S-bearing organic compounds in the Solar System is still not well-constrained. We tested by laboratory experiments whether complex organosulfur compounds can be formed when surfaces of icy Solar System bodies are submitted to high-energy S ions. Methods. Non-S-bearing organic residues, formed during the processing of astrophysical H_2_O:CH_3_ OH:NH_3_-bearing ice analogs, were irradiated with 105 keV-S 7+ ions at 10K and analyzed by high-resolving FT-ICR-MS. Resulting data were comprehensively analyzed, including the tools of network analysis. Out of many thousand detected compounds, 16% contain at least one sulfur atom (organosulfur (CHNOS) compounds), as verified via isotopic fine structures. These residue-related organosulfur compounds are different to the ones formed during S ion irradiation of ices at 10K. Furthermore, insoluble, apolar material was formed during the sulfur irradiation of residues. Potential organosulfur precursors (CHNO molecules) were identified by means of chemical network analysis. The finding of organosulfur compounds formed by sulfur irradiation of organic residues sheds new light into the rich and complex pristine organosulfur chemistry in the Solar System, as discussed here in context of current and future space missions. These results indicate that space weathering of Solar System bodies may lead to the formation of organosulfur compounds.
