- ID:
- ivo://CDS.VizieR/J/ApJ/683/1076
- Title:
- Transits of exoplanet XO-3b
- Short Name:
- J/ApJ/683/1076
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present photometry of 13 transits of XO-3b, a massive transiting planet on an eccentric orbit. Previous data led to two inconsistent estimates of the planetary radius. Our data strongly favor the smaller radius, with increased precision: R_p_=1.217+/-0.073R_{sun}_. A conflict remains between the mean stellar density determined from the light curve, and the stellar surface gravity determined from the shapes of spectral lines. We argue the light curve should take precedence, and revise the system parameters accordingly. The planetary radius is about 1{sigma} larger than the theoretical radius for a hydrogen-helium planet of the given mass and insolation. To help in planning future observations, we provide refined transit and occultation ephemerides.
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6932. Transits of GJ 1214
- ID:
- ivo://CDS.VizieR/J/A+A/549/A10
- Title:
- Transits of GJ 1214
- Short Name:
- J/A+A/549/A10
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 11 high-precision photometric transit observations of the transiting super-Earth planet GJ 1214 b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods.
- ID:
- ivo://CDS.VizieR/J/A+A/557/A30
- Title:
- Transits of HAT-P-16 and WASP-21
- Short Name:
- J/A+A/557/A30
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first photometric follow-up of the transiting planet HAT-P-16 b, and new photometric observations of WASP-21 b, obtained simultaneously with two medium-class telescopes located in different countries, using the telescope defocussing technique. We modeled these and other published data in order to estimate the physical parameters of the two planetary systems.
- ID:
- ivo://CDS.VizieR/J/A+A/518/A25
- Title:
- Transits of HD40307b by Spitzer
- Short Name:
- J/A+A/518/A25
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We used Spitzer and its IRAC camera to search for the transit of the super-Earth HD 40307b. The hypothesis that the planet transits could not be firmly discarded from our first photometric monitoring of a transit window because of the uncertainty coming from the modeling of the photometric baseline. To obtain a firm result, two more transit windows were observed and a global Bayesian analysis of the three IRAC time series and the HARPS radial velocities was performed. Unfortunately, the hypothesis that the planet transited during the observed phase window is firmly rejected, while the probability that the planet does transit but that the eclipse was missed by our observations is nearly negligible (0.26%)
- ID:
- ivo://CDS.VizieR/J/A+A/509/A4
- Title:
- Transits of 12 new exoplanet candidates
- Short Name:
- J/A+A/509/A4
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We used VLT/VIMOS images in the V band to obtain light curves of extrasolar planetary transits OGLE-TR-111 and OGLE-TR-113, and candidate planetary transits: OGLE-TR-82, OGLE-TR-86, OGLE-TR-91, OGLE-TR-106, OGLE-TR-109, OGLE-TR-110, OGLE-TR-159, OGLE-TR-167, OGLE-TR-170, OGLE-TR-171. Using difference imaging photometry, we were able to achieve millimagnitude errors in the individual data points. We present the analysis of the data and the light curves, by measuring transit amplitudes and ephemerides, and by calculating geometrical parameters for some of the systems. We observed 9 OGLE objects at the predicted transit moments. Two other transits were shifted in time by a few hours. For another seven objects we expected to observe transits during the VIMOS run, but they were not detected. The stars OGLE-TR-111 and OGLE-TR-113 are probably the only OGLE objects in the observed sample to host planets, with the other objects being very likely eclipsing binaries or multiple systems. In this paper we also report on four new transiting candidates which we have found in the data.
6936. Transits of OGLE-TR-132b
- ID:
- ivo://CDS.VizieR/J/ApJ/728/125
- Title:
- Transits of OGLE-TR-132b
- Short Name:
- J/ApJ/728/125
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the results of the first transit timing variation analysis of the very hot Jupiter OGLE-TR-132b, using 10 transits collected over a seven-year period. Our analysis combines three previously published transit light curves with seven new transits, which were observed between 2008 February and 2009 May with the new MagIC-e2V instrument on the Magellan Telescopes in Chile. We provide a revised planetary radius of R_p_=1.23+/-0.07R_J_, which is slightly larger, but consistent within the errors, than that given by previously published results. Analysis of the planet-to-star radius ratio, orbital separation, inclination, and transit duration reveals no apparent variation in any of those parameters during the time span observed. We also find no sign of transit timing variations larger than -108+/-49s, with most residuals very close to zero. This allows us to place an upper limit of 5-10M_{earth}_ for a coplanar, low-eccentricity perturber in either the 2:1 or 3:2 mean-motion resonance with OGLE-TR-132b. We similarly find that the data are entirely consistent with a constant orbital period and there is no evidence for orbital decay within the limits of precision of our data.
6937. Transits of OGLE-TR-111b
- ID:
- ivo://CDS.VizieR/J/ApJ/714/13
- Title:
- Transits of OGLE-TR-111b
- Short Name:
- J/ApJ/714/13
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present six new transits of the exoplanet OGLE-TR-111b observed with the Magellan Telescopes in Chile between 2008 April and 2009 March. We combine these new transits with five previously published transit epochs for this planet between 2005 and 2006 to extend the analysis of transit timing variations (TTVs) reported for this system. We derive a new planetary radius value of 1.019+/-0.026R_J_, which is intermediate to the previously reported radii of 1.067+/-0.054R_J_ and 0.922+/-0.057R_J_. We also examine the TTV and duration change claims of Diaz et al. (2008ApJ...682L..49D). Our analysis of all 11 transit epochs does not reveal any points with deviations larger than 2{sigma}, and most points are well within 1{sigma}. Although the transit duration nominally decreases over the four year span of the data, systematic errors in the photometry can account for this result. Therefore, there is no compelling evidence for either a timing or a duration variation in this system. Numerical integrations place an upper limit of about 1M_{earth}_ on the mass of a potential second planet in a 2:1 mean-motion resonance with OGLE-TR-111b.
- ID:
- ivo://CDS.VizieR/J/AJ/141/179
- Title:
- Transits of TrES-4b, HAT-P-3b and WASP-12b
- Short Name:
- J/AJ/141/179
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present transit photometry of three exoplanets, TrES-4b, HAT-P-3b, and WASP-12b, allowing for refined estimates of the systems' parameters. TrES-4b and WASP-12b were confirmed to be "bloated" planets, with radii of 1.706+/-0.056R_Jup_ and 1.736+/-0.092R_Jup_, respectively. These planets are too large to be explained with standard models of gas giant planets. In contrast, HAT-P-3b has a radius of 0.827+/-0.055R_Jup_, smaller than a pure hydrogen-helium planet and indicative of a highly metal-enriched composition. Analyses of the transit timings revealed no significant departures from strict periodicity. For TrES-4, our relatively recent observations allow for improvement in the orbital ephemerides, which is useful for planning future observations.
6939. Transits of WASP-33
- ID:
- ivo://CDS.VizieR/J/A+A/526/L10
- Title:
- Transits of WASP-33
- Short Name:
- J/A+A/526/L10
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the discovery of photometric oscillations in the host star of the exoplanet WASP-33b (HD 15082). The data were obtained in the R band in both transit and out-of-transit phases from the 0.3-m telescope and the Montcabrer Observatory and the 0.8-m telescope at the Montsec Astronomical Observatory. Proper fitting and subsequent removal of the transit signal reveals stellar photometric variations with a semi-amplitude of about 1mmag. The detailed analysis of the periodogram yields a structure of significant signals around a frequency of 21 cyc per day, which is typical of delta Scuti-type variable stars. An accurate study of the power spectrum reveals a possible commensurability with the planet orbital motion with a factor of 26, but this remains to be confirmed with additional time-series data that will permit the identification of the significant frequencies. These findings make WASP-33 the first transiting exoplanet host star with delta Scutt variability and a very interesting candidate to search for star-planet interactions.
6940. Transits of WASP-19b
- ID:
- ivo://CDS.VizieR/J/MNRAS/436/2
- Title:
- Transits of WASP-19b
- Short Name:
- J/MNRAS/436/2
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new ground-based, multi-colour, broad-band photometric measurements of the physical parameters, transmission and emission spectra of the transiting extrasolar planet WASP-19b. The measurements are based on observations of eight transits and four occultations through a Gunn i filter using the 1.54-m Danish Telescope, 14 transits through an Rc filter at the Perth Exoplanet Survey Telescope (PEST) observatory and one transit observed simultaneously through four optical (Sloan g', r', i', z') and three near-infrared (J, H, K) filters, using the Gamma Ray Burst Optical and Near-Infrared Detector (GROND) instrument on the MPG/ESO 2.2-m telescope. The GROND optical light curves have a point-to-point scatter around the best-fitting model between 0.52 and 0.65 mmag rms. We use these new data to measure refined physical parameters for the system. We find the planet to be more bloated (R_b_=1.410+/-0.017R_Jup_; M_b_=1.139+/-0.030M_Jup_) and the system to be twice as old as initially thought. We also used published and archived data sets to study the transit timings, which do not depart from a linear ephemeris. We detected an anomaly in the GROND transit light curve which is compatible with a spot on the photosphere of the parent star. The starspot position, size, spot contrast and temperature were established. Using our new and published measurements, we assembled the planet's transmission spectrum over the 370-2350nm wavelength range and its emission spectrum over the 750-8000nm range. By comparing these data to theoretical models we investigated the theoretically predicted variation of the apparent radius of WASP-19b as a function of wavelength and studied the composition and thermal structure of its atmosphere. We conclude that: (i) there is no evidence for strong optical absorbers at low pressure, supporting the common idea that the planet's atmosphere lacks a dayside inversion; (ii) the temperature of the planet is not homogenized, because the high warming of its dayside causes the planet to be more efficient in re-radiating than redistributing energy to the night side; (iii) the planet seems to be outside of any current classification scheme.