- ID:
- ivo://CDS.VizieR/J/A+A/502/695
- Title:
- Observations of HD 80606 planetary system
- Short Name:
- J/A+A/502/695
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We recently reported the photometric and spectroscopic detection of the primary transit of the 111-day-period, eccentric extra-solar planet HD 80606b, at Observatoire de Haute-Provence, France. The whole egress of the primary transit and a section of its central part were observed, allowing the measurement of the planetary radius, and evidence for a spin-orbit misalignment through the observation of the Rossiter-McLaughlin anomaly. The ingress not having been observed for this long-duration transit, uncertainties remained in the parameters of the system. We present here a refined, combined analysis of our photometric and spectroscopic data, together with further published radial velocities, ground-based photometry, and Spitzer photometry around the secondary eclipse, as well as new photometric measurements of HD 80606 acquired at Mount Hopkins, Arizona, just before the beginning of the primary transit.
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- ID:
- ivo://CDS.VizieR/J/A+A/437/705
- Title:
- Observations of PHEMU97 and PHEMU03 at Ukkel
- Short Name:
- J/A+A/437/705
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper we describe the observations of the mutual phenomena of the Galilean Satellites of Jupiter performed at the Royal Observatory of Belgium, as part of the PHEMU97 and PHEMU03 campaigns. The paper describes the observational technique, the data reduction and summarises the results obtained.
- ID:
- ivo://CDS.VizieR/J/other/SoSyR/53.368
- Title:
- Observations of the Galilean moons
- Short Name:
- J/other/SoSyR/53
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results of observations of the Galilean moons of Jupiter were carried out at the Normal Astrograph of the Pulkovo Observatory in 2018. We obtained 452 positions of the Galilean moons of Jupiter in the Gaia DR1 catalog system (ICRF, J2000.0) and 671 differential coordinates of the satellites relative to each other. The obtained mean errors in the satellites normal positions on the right ascension and declination, which demonstrate the intrinsic convergence of the observational results, are (eps)RA=0.003" and (eps)DE= 0.003", respectively, for the entire observational period. The errors of one difference are (sigm)RA=0.070", and (sigm)DE=0.067",respectively. The equatorial coordinates of the moons were compared to eight motion theories of planets and satellites. On average, the (O.C) residuals in the both coordinates relative to the motion theories are 0.014". The best agreement with observations is achieved by combination of all four motion theories of satellites with the planetary theory EPM2017, which yields average (O-C) residuals of approximately 0.01" for each of them. The new results were compared to those of the 2016-2017 observational season. As in the past, peculiarities in the behavior of the (O-C) residuals for Io and Ganymede have been noticed.
- ID:
- ivo://CDS.VizieR/J/A+A/500/L45
- Title:
- Observations of transits of the TrES-2 exoplanet
- Short Name:
- J/A+A/500/L45
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report a possible change in the orbit parameters of the TrES-2 exoplanet. With a period of 2.470621 days, the TrES-2 exoplanet exhibits almost "grazing" transits 110.4-minutes duration as measured in 2006 by Holman and collaborators (2007, Cat. <J/ApJ/664/1185>). We observed two transits of TrES-2 in 2008 using the 1.2m Oskar-Luhning telescope (OLT) of Hamburg observatory employing CCD photometry in an i-band and a near to R-band filter. A careful lightcurve analysis including a re-analys is of the 2006 observations shows that the current transit duration has shortened since 2006 by ~3.16-minutes. Although the new observations were taken in a different filter we argue that the observed change in transit duration time cannot be attributed to the treatment of limb darkening. If we assume the stellar and planetary radii to be constant, a change in orbit inclination is the most likely cause of this change in transit duration.
- ID:
- ivo://CDS.VizieR/J/MNRAS/376/1707
- Title:
- 1996-2006 observations of Triton
- Short Name:
- J/MNRAS/376/1707
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Astrometric positions of the Neptunian Satellite Triton are given for the opposition of Neptune for the years 1996, 2003, 2005 and 2006. The 943 observed positions were obtained at the Cassegrain focus of a 156-cm reflector. In our reduction, the up-to-date catalogue of stars UCAC2 was chosen to ensure a proper astrometric calibration. Our observed positions are compared to theoretical positions provided from JPL and IMCCE ephemerides. The observed minus calculated residuals have s.d. values of the order of 0.04arcsec.
- ID:
- ivo://CDS.VizieR/J/A+A/425/1107
- Title:
- Observations of Triton and Proteus
- Short Name:
- J/A+A/425/1107
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Earth based observations of Proteus are made highly difficult by the magnitude difference with Neptune, and the closeness to the planet. To overcome these difficulties, observation campaigns using a Hg-mask coronograph developed for astrometry are being pursued at the Laboratorio Nacional de Astrofisica, Brazil. The observations are made at visible light wavelengths with the 1.6 m reflector telescope. The large 4'x4' field of view of the camera makes it possible to image a sufficient number of background stars that are used to carry out the astrometric analysis of these data. The first results of the campaigns are presented in this paper. They include 45 independent observations made over 2 nights in 2002. The positions are referred to the Hipparcos/Tycho2 (<I/239>/<I/259>)frame. The mean offsets relative to the JPL ephemeris are =0.083" ({sigma}=0.148") in the x={DELTA}RAcosDE direction, and -0.051" ({sigma}=0.115") in the y={DELTA}DE direction. Additional astrometric data need to be collected in order to investigate further the possible offset of Proteus with respect to the Voyager ephemerides.
- ID:
- ivo://CDS.VizieR/J/ApJ/722/880
- Title:
- Observations of two transits of HD 80606b
- Short Name:
- J/ApJ/722/880
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present ground-based optical observations of the 2009 September and 2010 January transits of HD 80606b. Based on three partial light curves of the 2009 September event, we derive a midtransit time of T_c_[HJD]=2455099.196+/-0.026, which is about 1{sigma} away from the previously predicted time. We observed the 2010 January event from nine different locations, with most phases of the transit being observed by at least three different teams. We determine a midtransit time of T_c_[HJD]=2455210.6502+/-0.0064, which is within 1.3{sigma} of the time derived from a Spitzer observation of the same event.
- ID:
- ivo://CDS.VizieR/J/A+A/556/A118
- Title:
- Occultation of HIP 107302 by Jupiter
- Short Name:
- J/A+A/556/A118
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Occultations of bright stars by planets provide information on the state of their atmospheres. An occultation of the bright star 45 Capricornii (HIP 107302) by Jupiter occurred on the night of 3/4 August 2009. The event was observed at multiple sites in Europe, Africa and South America and with instruments ranging in aperture from 0.4m to 2.2m. All observations, except one, were carried out in methane absorption bands centred at 0.89um and 2.2um to minimise the planetary contribution to the measured stellar flux. Following the application of special post-processing techniques, differential photometry was performed. Nearby bright satellites were used as reference sources.
- ID:
- ivo://CDS.VizieR/J/AJ/146/12
- Title:
- Occultations through Saturn's C ring
- Short Name:
- J/AJ/146/12
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Saturn's C ring contains multiple spiral patterns that appear to be density waves driven by periodic gravitational perturbations. In other parts of Saturn's rings, such waves are generated by Lindblad resonances with Saturn's various moons, but most of the wave-like C-ring features are not situated near any strong resonance with any known moon. Using stellar occultation data obtained by the Visual and Infrared Mapping Spectrometer on board the Cassini spacecraft, we investigate the origin of six unidentified C-ring waves located between 80900 and 87200km from Saturn's center. By measuring differences in the waves' phases among the different occultations, we are able to determine both the number of arms in each spiral pattern and the speeds at which these patterns rotate around the planet. We find that all six of these waves have between two and four arms and pattern speeds between 1660{deg}/day and 1861{deg}/day. These speeds are too large to be attributed to any satellite resonance. Instead, they are comparable to the predicted pattern speeds of waves generated by low-order normal-mode oscillations within the planet. The precise pattern speeds associated with these waves should therefore provide strong constraints on Saturn's internal structure. Furthermore, we identify multiple waves with the same number of arms and very similar pattern speeds, indicating that multiple m=3 and m=2 sectoral (l=m) modes may exist within the planet.
- ID:
- ivo://CDS.VizieR/J/MNRAS/343/1131
- Title:
- 1998-2000 OGLE events microlensing limits
- Short Name:
- J/MNRAS/343/1131
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We analyse three years (1998-2000) of Optical Gravitational Lensing Experiment (OGLE) observations of microlensing events to place limits on the abundance of planets with a planet-to-star mass ratio q=10^-3^ at distances ~1-4AU from their host stars, i.e. 'cool Jupiters'. We fit a total of 145 events using a maximum-likelihood fit that adjusts six parameters. Each data point on the light curve allows us to exclude planets close to the two images of the source appearing on opposite sides of the Einstein ring of the lens star. We proceed to compute detection probability maps for each event, using {Delta}{chi}^2^ threshold values of 25, 60 and 100, and combine the results from all events to place global constraints. Our selection criteria returned five candidate events for a planet with mass ratio q=10^-3^.