- ID:
- ivo://CDS.VizieR/J/A+A/568/A127
- Title:
- Light curves of WASP-67 transit events
- Short Name:
- J/A+A/568/A127
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The extrasolar planet WASP-67 b is the first hot Jupiter definitively known to undergo only partial eclipses. The lack of the second and third contact points in this planetary system makes it difficult to obtain accurate measurements of its physical parameters. Aims. By using new high-precision photometric data, we confirm that WASP-67 b shows grazing eclipses and compute accurate estimates of the physical properties of the planet and its parent star. Methods. We present high-quality, multi-colour, broad-band photometric observations comprising five light curves covering two transit events, obtained using two medium-class telescopes and the telescope-defocussing technique. One transit was observed through a Bessel-R filter and the other simultaneously through filters similar to Sloan griz. We modelled these data using jktebop. The physical parameters of the system were obtained from the analysis of these light curves and from published spectroscopic measurements. Results. All five of our light curves satisfy the criterion for being grazing eclipses. We revise the physical parameters of the whole WASP-67 system and, in particular, significantly improve the measurements of the planet's radius and density as compared to the values in the discovery paper. The transit ephemeris was also substantially refined. We investigated the variation of the planet's radius as a function of the wavelength, using the simultaneous multi-band data, finding that our measurements are consistent with a flat spectrum to within the experimental uncertainties.
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- ID:
- ivo://CDS.VizieR/J/A+A/562/A126
- Title:
- Light curves of WASP-80 transit events
- Short Name:
- J/A+A/562/A126
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- WASP-80 is one of only two systems known to contain a hot Jupiter which transits its M-dwarf host star. We present eight light curves of one transit event, obtained simultaneously using two defocussed telescopes. These data were taken through the Bessell I, Sloan g'r'i'z' and near-infrared JHK passbands. We use our data to search for opacity-induced changes in the planetary radius, but find that all values agree with each other. Our data are therefore consistent with a flat transmission spectrum to within the observational uncertainties. We also measure an activity index of the host star of logR'_HK=-4.495, meaning that WASP-80A shows strong chromospheric activity. The non-detection of starspots implies that, if they exist, they must be small and symmetrically distributed on the stellar surface. We model all available optical transit light curves and obtain improved physical properties and orbital ephemerides for the system.
- ID:
- ivo://CDS.VizieR/J/ApJ/708/717
- Title:
- Light curve templates of RR Lyrae stars
- Short Name:
- J/ApJ/708/717
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an improved analysis of halo substructure traced by RR Lyrae stars in the Sloan Digital Sky Survey (SDSS) stripe 82 region. With the addition of SDSS-II data, a revised selection method based on new ugriz light curve templates results in a sample of 483 RR Lyrae stars that is essentially free of contamination. The main result from our first study persists: the spatial distribution of halo stars at galactocentric distances 5-100kpc is highly inhomogeneous. At least 20% of halo stars within 30kpc from the Galactic center can be statistically associated with substructure. We present strong direct evidence, based on both RR Lyrae stars and main-sequence stars, that the halo stellar number density profile significantly steepens beyond a Galactocentric distance of ~30kpc, and a larger fraction of the stars are associated with substructure. By using a novel method that simultaneously combines data for RR Lyrae and main-sequence stars, and using photometric metallicity estimates for main-sequence stars derived from deep co-added u-band data, we measure the metallicity of the Sagittarius dSph tidal stream (trailing arm) toward RA~2h-3h and DE~0{deg} to be 0.3dex higher ([Fe/H]=-1.2) than that of surrounding halo field stars.
- ID:
- ivo://CDS.VizieR/J/A+A/574/A60
- Title:
- Light curve templates of SNe Ib/c from SDSS
- Short Name:
- J/A+A/574/A60
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present optical (ugriz) light curve templates of supernovae Ib/c from the SDSS II SN survey.
- ID:
- ivo://CDS.VizieR/J/AJ/156/6
- Title:
- Light element abundances of RGB & AGB stars in M10
- Short Name:
- J/AJ/156/6
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CN and CH band measurements for 137 red giant branch (RGB) and asymptotic giant branch (AGB) stars in the Galactic globular cluster M10. Our measurements come from low-resolution spectroscopy taken with the Hydra spectrograph on the WIYN-3.5 m telescope. We use these measurements to identify two populations of stars within the cluster, CN-normal and CN-enhanced, and find that in our sample 60% of stars are CN-enhanced. Our large sample allows us to conduct a detailed analysis on the carbon and nitrogen abundances and the radial distribution of each population separately. Our analysis of the radial dependence shows that each population has the same radial distribution in the cluster, which is likely due to the cluster being dynamically evolved. We also compare our results to other methods of classifying multiple populations in globular clusters such as the Na-O anti-correlation and the HST pseudo-color-magnitude diagrams. We find that these three methods of identifying multiple populations are in good agreement with each other for M10 and all lead to an estimate of the fraction of second-generation stars approximately equal to 60%. Among AGB stars, when classified by the CN band, there appears to be a lack of second-generation stars when compared to the RGB stars. However, when classified by [N/Fe], we find a similar 60% of AGB stars in the second generation. Finally, we use the measured carbon and nitrogen abundances in RGB stars to study the change of each element with magnitude as stars evolve up the RGB, comparing the results to globular clusters of similar metallicity, M3 and M13.
- ID:
- ivo://CDS.VizieR/J/other/PZP/9.3
- Title:
- Light elements for 25 Mira type variables
- Short Name:
- J/other/PZP/9.3
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We could study the variables thanks to the publicly available electronic archives of CCD observations of the ASAS-3 project (Pojmanski, 2002, Cat. <II/264>) and to images of the US Naval Observatory Image and Catalogue Archive (https://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/icas). We recovered the variables NSV 07017 and NSV 07082 suspected by Luyten (1933AN....249..395L); NSV 07106 suspected by Luyten (1933AN....250..259L); NSV 06939, NSV 06975, NSV 06991, NSV 07011, NSV 07025, NSV 07035, NSV 07045, NSV 07047, NSV 07051 and NSV 07062 suspected by Luyten (1934AN....253..135L); NSV 06907, NSV 06946, NSV 07022 and NSV 07083 suspected by Luyten (1935AN....256..325L); NSV 07106 suspected by Luyten (1936AN....258..121L). Finding charts for these suspected variables have never been published.
- ID:
- ivo://CDS.VizieR/V/141
- Title:
- Light-Motion Curve Catalogue (LMCC) in Stripe 82
- Short Name:
- V/141
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a public archive of light-motion curves in Sloan Digital Sky Survey (SDSS) Stripe 82, covering 99{deg} in right ascension (20.7h to 3.3h) and spanning 2.52{deg} in declination (-1.26 to 1.26), for a total sky area of about 249sq.deg. Stripe 82 has been repeatedly monitored in the u, g, r, i and z bands over a seven-year baseline. Objects are cross-matched between runs, taking into account the effects of any proper motion. The resulting catalogue contains almost 4million light-motion curves of stellar objects and galaxies. The photometry are recalibrated to correct for varying photometric zeropoints, achieving ~20mmag and 30mmag root-mean-square (RMS) accuracy down to 18mag in the g, r, i and z bands for point sources and extended sources, respectively. The astrometry are recalibrated to correct for inherent systematic errors in the SDSS astrometric solutions, achieving 32mas and 35mas RMS accuracy down to 18mag for point sources and extended sources, respectively. For each light-motion curve, 229 photometric and astrometric quantities are derived and stored in a higher-level catalogue. On the photometric side, these include mean exponential and PSF magnitudes along with uncertainties, RMS scatter, {chi}^2^ per degree of freedom, various magnitude distribution percentiles, object type (stellar or galaxy), and eclipse, Stetson and Vidrih variability indices. On the astrometric side, these quantities include mean positions, proper motions as well as their uncertainties and {chi}^2^ per degree of freedom. The here presented light-motion curve catalogue is complete down to r~21.5mag and is at present the deepest large-area photometric and astrometric variability catalogue available.
- ID:
- ivo://CDS.VizieR/J/A+A/299/557
- Title:
- Light variations on Beta Pic
- Short Name:
- J/A+A/299/557
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have analyzed {beta} Pictoris photometric measurements obtained from La Silla by the Geneva Observatory from 1975 to 1992. These data show evidence of variations in the brightness of the star, with no color dependency. Here, we demonstrate that the light variations are present on long as well as on short time scales. On a long time scale, we show that the apparent magnitude of {beta} Pictoris decreased by 0.011+/-0.004mag from 1979 to 1982. Moreover, when we consider all the measurements, the chance that there is no variation at all can be estimated to be less than 10^-4^. On short time scales there is a peculiar feature observed during about 30 days; the variations may be as high as 0.04mag magnitude. A maximum entropy reconstruction of the photometric data is tentatively proposed and some physical interpretations are presented.
- ID:
- ivo://CDS.VizieR/J/other/Nat/474.484
- Title:
- Ligth curves of 4 supernovae
- Short Name:
- J/other/Nat/474.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Supernovae are stellar explosions driven by gravitational or thermonuclear energy that is observed as electromagnetic radiation emitted over weeks or more. In all known supernovae, this radiation comes from internal energy deposited in the outflowing ejecta by one or more of the following processes: radioactive decay of freshly synthesized elements (typically <SUP>56</SUP>Ni), the explosion shock in the envelope of a supergiant star, and interaction between the debris and slowly moving, hydrogen-rich circumstellar material. Here we report observations of a class of luminous supernovae whose properties cannot be explained by any of these processes. The class includes four new supernovae that we have discovered and two previously unexplained events (SN 2005ap and SCP 06F6) that we can now identify as members of the same class.
- ID:
- ivo://CDS.VizieR/J/AJ/134/179
- Title:
- Ligth minimum times of TY Boo
- Short Name:
- J/AJ/134/179
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a detailed period analysis of TY Bootis, based on all available light minimum times covering about 80 years. We discovered that there exists a cyclic variation overlaying a secular period decrease from the distorted (O-C) diagram. A long-term decrease with a sinusoidal oscillation (i.e., eq. (2)) or with a light-time effect (i.e., eq. (3)) may be reasonable due to the smaller difference between their sum of residuals. The sinusoidal change with a period of 59.7 yr for equation (2) can be attributed to either a light-time effect or cyclic magnetic activity of both components. For the assumed third body, the period and eccentricity of the light-time orbit are P_3_=58.6yr and e'=0.1744, respectively. If the existence of an additional unseen body is true, this binary may be a tertiary system. The long-term orbital period decrease suggests that TY Boo is undergoing a mass transfer from the primary component to the secondary component at a rate of dm/dt=-3.15x10^-8^M_{sun}_/yr for equation (2) or dm/dt=-2.90x10^-8^M_{sun}_/yr for equation (3). As its mass transfers, accompanied by angular momentum loss due to mass outflow L_2_, this binary will evolve into a deep contact configuration.
