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2441. HATNet Pleiades Rotation Period Catalogue
ID:
ivo://CDS.VizieR/J/MNRAS/408/475
Title:
HATNet Pleiades Rotation Period Catalogue
Short Name:
J/MNRAS/408/475
Date:
21 Oct 2021
Publisher:
CDS
Description:
Using data from the Hungarian-made Automated Telescope Network (HATNet) survey for transiting exoplanets, we measure photometric rotation periods for 368 Pleiades stars with 0.4~<M~<1.3M_{sun}_. We detect periodic variability for 74 per cent of the cluster members in this mass range that are within our field-of-view, and 93 per cent of the members with 0.7~<M~<1.0M_{sun}_. This increases, by a factor of 5, the number of Pleiades members with measured periods. We compare these data to the rich sample of spectroscopically determined projected equatorial rotation velocities (vsini) available in the literature for this cluster. Included in our sample are 14 newly identified probable cluster members which have proper motions, photometry and rotation periods consistent with membership.
2442. HATNET variability survey
ID:
ivo://CDS.VizieR/J/AJ/128/1761
Title:
HATNET variability survey
Short Name:
J/AJ/128/1761
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Hungarian-made Automated Telescope Network (HATnet) is an ongoing project to detect transiting extrasolar planets using small-aperture (11cm diameter) robotic telescopes. In this paper, we present the results from using image subtraction photometry to reduce a crowded stellar field observed with one of the HATnet telescopes (HAT-5). This field was chosen to overlap with the planned Kepler mission. We obtained I-band light curves for 98,000 objects in a 67 square degree field of view centered at J2000 ({alpha},{delta})=(19h44m00.0s, +37{deg}32'00.0"), near the Galactic plane in the constellations Cygnus and Lyra. These observations include 788 exposures of 5' length over 30-days. For the brightest stars (I~8.0) we achieved a precision of 3.5mmag, falling to 0.1mag at the faint end (I~14). From these light curves we identify 1617 variable stars, of which 1439 are newly discovered.
2443. HAT-P-18 and HAT-P-19 follow-up
ID:
ivo://CDS.VizieR/J/ApJ/726/52
Title:
HAT-P-18 and HAT-P-19 follow-up
Short Name:
J/ApJ/726/52
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of two new transiting extrasolar planets. HAT-P-18b orbits the V=12.759 K2 dwarf star GSC 2594-00646, with a period P=5.508023+/-0.000006 days, transit epoch T_c_=2454715.02174+/-0.00020(BJD), and transit duration 0.1131+/-0.0009 days. The host star has a mass of 0.77+/-0.03M_{sun}_, radius of 0.75+/-0.04R_{sun}_, effective temperature 4803+/-80K, and metallicity [Fe/H]=+0.10+/-0.08. The planetary companion has a mass of 0.197+/-0.013M_J_ and radius of 0.995+/-0.052R_J_, yielding a mean density of 0.25+/-0.04g/cm^3^. HAT-P-19b orbits the V=12.901 K1 dwarf star GSC 2283-00589, with a period P=4.008778+/-0.000006 days, transit epoch T_c_=2455091.53417+/-0.00034(BJD), and transit duration 0.1182+/-0.0014 days. The host star has a mass of 0.84+/-0.04M_{sun}_, radius of 0.82+/-0.05R_{sun}_, effective temperature 4990+/-130K, and metallicity [Fe/H]=+0.23+/-0.08. The planetary companion has a mass of 0.292+/-0.018M_J_ and radius of 1.132+/-0.072R_J_, yielding a mean density of 0.25+/-0.04g/cm^3^. The radial velocity residuals for HAT-P-19 exhibit a linear trend in time, which indicates the presence of a third body in the system. Comparing these observations with theoretical models, we find that HAT-P-18b and HAT-P-19b are each consistent with a hydrogen-helium-dominated gas giant planet with negligible core mass. HAT-P-18b and HAT-P-19b join HAT-P-12b and WASP-21b in an emerging group of low-density Saturn-mass planets, with negligible inferred core masses. However, unlike HAT-P-12b and WASP-21b, both HAT-P-18b and HAT-P-19b orbit stars with super-solar metallicity.
2444. HAT-P-32 and HAT-P-33 follow-up
ID:
ivo://CDS.VizieR/J/ApJ/742/59
Title:
HAT-P-32 and HAT-P-33 follow-up
Short Name:
J/ApJ/742/59
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of two exoplanets transiting high-jitter stars. HAT-P-32b orbits the bright V=11.289 late-F-early-G dwarf star GSC 3281-00800, with a period P=2.150008+/-0.000001d. The stellar and planetary masses and radii depend on the eccentricity of the system, which is poorly constrained due to the high-velocity jitter (~80m/s). Assuming a circular orbit, the star has a mass of 1.16+/-0.04M_{sun}_ and radius of 1.22+/-0.02R_{sun}_, while the planet has a mass of 0.860+/-0.164M_J_ and a radius of 1.789+/-0.025R_J_. The second planet, HAT-P-33b, orbits the bright V=11.188 late-F dwarf star GSC 2461-00988, with a period P=3.474474+/-0.000001d. As for HAT-P-32, the stellar and planetary masses and radii of HAT-P-33 depend on the eccentricity, which is poorly constrained due to the high jitter (~50m/s). In this case, spectral line bisector spans (BSs) are significantly anti-correlated with the radial velocity residuals, and we are able to use this correlation to reduce the residual rms to ~35m/s. We find that the star has a mass of 1.38+/-0.04M_{sun}_ and a radius of 1.64+/-0.03R_{sun}_ while the planet has a mass of 0.762+/-0.101M_J_ and a radius of 1.686+/-0.045R_J_ for an assumed circular orbit. Due to the large BS variations exhibited by both stars we rely on detailed modeling of the photometric light curves to rule out blend scenarios. Both planets are among the largest radii transiting planets discovered to date.
2445. HAT-P-28 and HAT-P-29 photometry
ID:
ivo://CDS.VizieR/J/ApJ/733/116
Title:
HAT-P-28 and HAT-P-29 photometry
Short Name:
J/ApJ/733/116
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the discovery of two transiting exoplanets. HAT-P-28b orbits a V=13.03 G3 dwarf star with a period P=3.2572 days and has a mass of 0.63+/-0.04M_J_ and a radius of 1.21^+0.11^_-0.08_R_J_ yielding a mean density of 0.44+/-0.09g/cm^3^. HAT-P-29b orbits a V=11.90 F8 dwarf star with a period P=5.7232 days and has a mass of 0.78^+0.08^_-0.04_M_J_ and a radius of 1.11^+0.14^_-0.08_R_J_ yielding a mean density of 0.71+/-0.18g/cm^3^. We discuss the properties of these planets in the context of other known transiting planets
2446. HAT-P-36 and WASP-11/HAT-P-10 light curves
ID:
ivo://CDS.VizieR/J/A+A/579/A136
Title:
HAT-P-36 and WASP-11/HAT-P-10 light curves
Short Name:
J/A+A/579/A136
Date:
21 Oct 2021
Publisher:
CDS
Description:
Orbital obliquity is thought to be a fundamental parameter in tracing the physical mechanisms that cause the migration of giant planets from the snow line down to roughly 10^-2^au from their host stars. We are carrying out a large programme to estimate the spin-orbit alignment of a sample of transiting planetary systems to study what the possible configurations of orbital obliquity are and whether they correlate with other stellar or planetary properties. We determine the true and the projected obliquity of HAT-P-36 and WASP-11/HAT-P-10 systems, respectively, which are both composed of a relatively cool star (with effective temperature Teff<6100K) and a hot-Jupiter planet. Thanks to the high-resolution spectrograph HARPS-N, we observed the Rossiter-McLaughlin effect for both systems by acquiring precise (3-8m/s) radial-velocity measurements during planetary transit events. We also present photometric observations comprising six light curves that cover five transit events, which were obtained using three medium-class telescopes. One transit of WASP-11/HAT-P-10 was followed simultaneously from two observatories. The three transit light curves of HAT-P-36 b show anomalies that are attributable to starspot complexes on the surface of the parent star, in agreement with the analysis of its spectra that indicates moderate activity (logR'_HK_=-4.65dex). By analysing the complete HATNet data set of HAT-P-36, we estimated the stellar rotation period by detecting a periodic photometric modulation in the light curve caused by star spots, obtaining Prot=15.3+/-0.4days, which implies that the inclination of the stellar rotational axis with respect to the line of sight is i=65+/-34degrees. We used the new spectroscopic and photometric data to revise the main physical parameters and measure the sky-projected misalignment angle of the two systems. We found {lambda}=-14+/-18{deg} for HAT-P-36 and {lambda}=-7+/-5{deg} for WASP-11/HAT-P-10, indicating in both cases a good spin-orbit alignment. In the case of HAT-P-36, we were also able to estimate an upper limit of its real obliquity, which turned out to be <63{deg}.
2447. HAT-P23 and WASP-48 light curves
ID:
ivo://CDS.VizieR/J/A+A/577/A54
Title:
HAT-P23 and WASP-48 light curves
Short Name:
J/A+A/577/A54
Date:
21 Oct 2021
Publisher:
CDS
Description:
Accurate and repeated photometric follow-up observations of planetary transit events are important to precisely characterize the physical properties of exoplanets. A good knowledge of the main characteristics of the exoplanets is fundamental in order to trace their origin and evolution. Multi-band photometric observations play an important role in this process. By using new photometric data, we computed precise estimates of the physical properties of two transiting planetary systems at equilibrium temperatures of ~2000K. We present new broadband, multi-colour photometric observations obtained using three small class telescopes and the telescope-defocussing technique. In particular we obtained 11 and 10 light curves covering 8 and 7 transits of HAT-P-23 and WASP-48, respectively. For each of the two targets, one transit event was simultaneously observed through four optical filters. One transit of WASP-48 b was monitored with two telescopes from the same observatory. The physical parameters of the systems were obtained by fitting the transit light curves with jktebop and from published spectroscopic measurements.
2448. HAT-P-42b and HAT-P-43b ri light curves
ID:
ivo://CDS.VizieR/J/A+A/558/A86
Title:
HAT-P-42b and HAT-P-43b ri light curves
Short Name:
J/A+A/558/A86
Date:
21 Oct 2021
Publisher:
CDS
Description:
We announce the discovery of two new transiting planets, and provide their accurate initial characterization. First identified from the HATNet wide-field photometric survey, these candidate transiting planets were then followed-up with a variety of photometric observations. Determining the planetary nature of the objects and characterizing the parameters of the systems were mainly done with the SOPHIE spectrograph at the 1.93m telescope at OHP and the TRES spectrograph at the 1.5m telescope at FLWO.
2449. HAT-P-3b and TrES-3b light curves and Mid-times
ID:
ivo://CDS.VizieR/J/PASP/129/F4401
Title:
HAT-P-3b and TrES-3b light curves and Mid-times
Short Name:
J/PASP/129/F4401
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present photometric light curves of the transiting extrasolar planets HAT-P-3b and TrES-3b obtained with multiple northern hemisphere telescope using the defocused photometry technique. We also present calculated Mid-times for all light curves.
2450. HAT-P-32b differential photometry time series
ID:
ivo://CDS.VizieR/J/A+A/624/A62
Title:
HAT-P-32b differential photometry time series
Short Name:
J/A+A/624/A62
Date:
21 Oct 2021
Publisher:
CDS
Description:
We obtained 11 photometric time series of secondary eclipse events of the hot Jupiter HAT-P-32b in the Sloan z' band. We inferred the eclipse depth and employed this value to derive an upper limit on the planetary geometric albedo.