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22401. Transit of exoplanet WASP-21b
ID:
ivo://CDS.VizieR/J/A+A/519/A98
Title:
Transit of exoplanet WASP-21b
Short Name:
J/A+A/519/A98
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of WASP-21b, a new transiting exoplanet discovered by the Wide Angle Search for Planets (WASP) Consortium and established and characterized with the FIES, SOPHIE, CORALIE and HARPS fiber-fed echelle spectrographs. A 4.3-d period, 1.1% transit depth and 3.4-h duration are derived for WASP-21b using SuperWASP-North and high precision photometric observations at the Liverpool Telescope. Simultaneous fitting to the photometric and radial velocity data with a Markov Chain Monte Carlo procedure leads to a planet in the mass regime of Saturn. With a radius of 1.07R_Jup_ and mass of 0.30M_Jup_, WASP-21b has a density close to 0.24{rho}_Jup_ corresponding to the distribution peak at low density of transiting gaseous giant planets. With a host star metallicity [Fe/H] of -0.46, WASP-21b strengthens the correlation between planetary density and host star metallicity for the five known Saturn-like transiting planets. Furthermore there are clear indications that WASP-21b is the first transiting planet belonging to the thick disc.
22402. Transit of HAT-P-5
ID:
ivo://CDS.VizieR/J/MNRAS/422/3099
Title:
Transit of HAT-P-5
Short Name:
J/MNRAS/422/3099
Date:
21 Oct 2021
Publisher:
CDS
Description:
The radii of giant planets, as measured from transit observations, may vary with wavelength due to Rayleigh scattering or variations in opacity. Such an effect is predicted to be large enough to detect using ground-based observations at multiple wavelengths. We present the defocused photometry of a transit in the HAT-P-5 system, obtained simultaneously through Stroemgren u, Gunn g and r, and Johnson I filters. Two more transit events were observed through a Gunn r filter.
22403. Transit of super-Earth 55 Cnc e
ID:
ivo://CDS.VizieR/J/A+A/533/A114
Title:
Transit of super-Earth 55 Cnc e
Short Name:
J/A+A/533/A114
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report on the detection of a transit of the super-Earth 55 Cnc e with warm Spitzer in IRAC's 4.5um band.
22404. Transit of TrES-1
ID:
ivo://CDS.VizieR/J/ApJ/657/1098
Title:
Transit of TrES-1
Short Name:
J/ApJ/657/1098
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present z-band photometry of three consecutive transits of the exoplanet TrES-1, with an accuracy of 0.15% and a cadence of 40s. We improve on estimates of the system parameters, finding in particular that the planetary radius is 1.081+/-0.029R_Jup_ and the stellar radius is 0.011+/-0.020R_{sun}_. The uncertainties include both the statistical error and the systematic error arising from the uncertainty in the stellar mass. The transit times are determined to within about 15s and allow us to refine the estimate of the mean orbital period: P=3.0300737+/-0.0000026days. We find no evidence for starspots or other irregularities that have been previously reported.
22405. Transit parameters for planets around subgiants
ID:
ivo://CDS.VizieR/J/AJ/157/149
Title:
Transit parameters for planets around subgiants
Short Name:
J/AJ/157/149
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the discovery of seven new planets and eight planet candidates around subgiant stars, as additions to the known sample of planets around "retired A stars". Among these are the possible first three-planet systems around subgiant stars, HD 163607 and HD 4917. Additionally, we present calculations of possible transit times, durations, depths, and probabilities for all known planets around subgiant (3<logg<4) stars, focused on possible transits during the TESS mission. While most have transit probabilities of 1%-2%, we find that there are three planets with transit probabilities >9%.
22406. Transit photometry of NGTS-14Ab
ID:
ivo://CDS.VizieR/J/A+A/646/A183
Title:
Transit photometry of NGTS-14Ab
Short Name:
J/A+A/646/A183
Date:
21 Oct 2021
Publisher:
CDS
Description:
The sub-Jovian or Neptunian desert is a previously-identified region of parameter space where there is a relative dearth of intermediate- mass planets at short orbital periods. We present the discovery of a new transiting planetary system within the Neptunian desert, NGTS-14A. Transits of NGTS-14Ab were discovered in photometry from the Next Generation Transit Survey (NGTS). Follow-up transit photometry was conducted from several ground-based facilities, as well as extracted from TESS full- frame images. We combine radial velocities from the HARPS spectrograph with the photometry in a global analysis to determine the system parameters. NGTS-14Ab has a radius about 30 per cent larger than that of Neptune (0.444+/-0.030R_Jup_), and is around 70 per cent more massive than Neptune (0.092+/-0.012 M_Jup_). It transits the main-sequence K1 star, NGTS-14A, with a period of 3.54 days, just far enough to have maintained at least some of its primordial atmosphere. We have also identified a possible long-period stellar mass companion to the system, NGTS-14B.
22407. Transit search in the V1400 Cen system
ID:
ivo://CDS.VizieR/J/A+A/652/A117
Title:
Transit search in the V1400 Cen system
Short Name:
J/A+A/652/A117
Date:
22 Feb 2022
Publisher:
CDS
Description:
In 2007, the young star 1SWASP J140747.93-394542.6 (V1400 Cen) underwent a complex series of deep eclipses over 56 days. This was attributed to the transit of a ring system filling a large fraction of the Hill sphere of an unseen substellar companion. Subsequent photometric monitoring has not found any other deep transits from this candidate ring system, but if there are more substellar companions and if they are coplanar with the potential ring system, there is a chance that they will transit the star as well. This young star is active, and the light curves show a 5% modulation in amplitude with a dominant rotation period of 3.2 days due to starspots rotating into and out of view. We model and remove the rotational modulation of the J1407 light curve and search for additional transit signatures of substellar companions orbiting around J1407. We combine the photometry of J1407 from several observatories, spanning a 19 year baseline. We remove the rotational modulation by modeling the variability as a periodic signal, whose periodicity changes slowly with time over several years due to the activity cycle of the star. A transit least squares (TLS) analysis is used to search for any periodic transiting signals within the cleaned light curve. We identify an activity cycle of J1407 with a period of 5.4yr. A TLS search does not find any plausible periodic eclipses in the light curve, from 1.2% amplitude at 5 days up to 1.9% at 20 days. This sensitivity is confirmed by injecting artificial transits into the light curve and determining the recovery fraction as a function of transit depth and orbital period. J1407 is confirmed as a young active star with an activity cycle consistent with a rapidly rotating solar mass star. With the rotational modulation removed, the TLS analysis reaches down to planetary mass radii for young exoplanets, ruling out transiting companions with radii larger than about 1R_Jup_.
22408. Transits observed in OGLE 2001-2003
ID:
ivo://CDS.VizieR/II/278
Title:
Transits observed in OGLE 2001-2003
Short Name:
II/278
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present results of an extensive photometric search for planetary and low-luminosity object transits in the Galactic disk stars commencing the third phase of the Optical Gravitational Lensing Experiment - OGLE-III.
22409. Transits, occultation times and RVs of WASP-12b
ID:
ivo://CDS.VizieR/J/ApJ/888/L5
Title:
Transits, occultation times and RVs of WASP-12b
Short Name:
J/ApJ/888/L5
Date:
25 Oct 2021 10:19:53
Publisher:
CDS
Description:
WASP-12b is a transiting hot Jupiter on a 1.09 day orbit around a late-F star. Since the planet's discovery in 2008, the time interval between transits has been decreasing by 29+/-2ms/yr. This is a possible sign of orbital decay, although the previously available data left open the possibility that the planet's orbit is slightly eccentric and is undergoing apsidal precession. Here, we present new transit and occultation observations that provide more decisive evidence for orbital decay, which is favored over apsidal precession by a {Delta}BIC of 22.3 or Bayes factor of 70000. We also present new radial-velocity data that rule out the Romer effect as the cause of the period change. This makes WASP-12 the first planetary system for which we can be confident that the orbit is decaying. The decay timescale for the orbit is P/{dot}P=3.25+/-0.23Myr. Interpreting the decay as the result of tidal dissipation, the modified stellar tidal quality factor is Q_*_^'^=1.8x10^5^.
22410. Transits of exoplanet XO-3b
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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