266 citations · 1.8k across the 48 of their papers we have counts for
21 papers · 1 filter
Application of the Trend Filtering Algorithm in the search for multiperiodic signals
G. Kovacs, G. A. Bakos
During the past few years the Trend Filtering Algorithm (TFA) has become an important utility in filtering out time-dependent systematic effects in photometric databases for extras…
HAT-P-9b: A Low Density Planet Transiting a Moderately Faint F star
Avi Shporer, Gaspar A. Bakos, Francois Bouchy +14
We report the discovery of a planet transiting a moderately faint (V=12.3 mag) late F star, with an orbital period of 3.92289 +/- 0.00004 days. From the transit light curve and rad…
HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field
A. Pal, G. A. Bakos, G. Torres +14
We report on the latest discovery of the HATNet project; a very hot giant planet orbiting a bright (V = 10.5) star with a small semi-major axis of a = 0.0377 +/- 0.0005 AU. Ephemer…
On the Cepheid Metallicity Dichotomy
Geza Kovacs
With the aid of stellar atmosphere models, we derive iron abundances [Fe/H] from the OGLE B, V, I photometry on the Magellanic Cloud Cepheids. We show that in both clouds the avera…
Pulsational and evolutionary analysis of the double-mode RR Lyrae star BS Com
I. Dekany, G. Kovacs, J. Jurcsik +8
We derive the basic physical parameters of the field double-mode RR Lyrae star BS Com from its observed periods and the requirement of consistency between the pulsational and evolu…
HAT-P-5b: A Jupiter-like hot Jupiter Transiting a Bright Star
G. A. Bakos, A. Shporer, A. Pal +17
We report the discovery of a planet transiting a moderately bright (V = 12.00) G star, with an orbital period of 2.788491 +/-0.000025 days. From the transit light curve we determin…
HAT-P-3b: A heavy-element rich planet transiting a K dwarf star
G. Torres, G. A. Bakos, G. Kovacs +13
We report the discovery of a Jupiter-size planet transiting a relatively bright (V = 11.56) and metal-rich early K dwarf star with a period of about 2.9 days. On the basis of follo…
HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
G. A. Bakos, G. Kovacs, G. Torres +18
We report the discovery of a massive (Mp = 9.04+/-0.50 MJup) planet transiting the bright (V = 8.7) F8 star HD 147506, with an orbital period of 5.63341+/-0.00013 days and an eccen…
The Mass and Radius of the Unseen M-Dwarf Companion in the Single-Lined Eclipsing Binary HAT-TR-205-013
T. G. Beatty, J. M. Fernandez, D. W. Latham +7
We derive masses and radii for both components in the single-lined eclipsing binary HAT-TR-205-013, which consists of a F7V primary and a late M-dwarf secondary. The system's perio…
Signal Search and Reconstruction by a Trend Filtering Algorithm
G. Kovacs, G. A. Bakos
We present additional tests of our algorithm aimed at filtering out systematics due to data reduction and instrumental imperfections in time series obtained by ensemble photometry.…
HAT-P-1b: A Large-Radius, Low-Density Exoplanet Transiting one Member of a Stellar Binary
G. A. Bakos, R. W. Noyes, G. Kovacs +16
Using small automated telescopes in Arizona and Hawaii, the HATNet project has detected an object transiting one member of the double star system ADS 16402 AB. This system is a pai…
On the incidence rate of first overtone Blazhko stars in the Large Magellanic Cloud
Andrea Nagy, Geza Kovacs
By using the full span of multicolor data on a representative sample of first overtone RR Lyrae stars in the Large Magellanic Cloud (LMC) we revisit the problem of the incidence ra…
Metallicity effects on distances based on double-mode Cepheids
Geza Kovacs
We test the effect of systematic metallicity difference between the two types of double-mode Cepheids in the Magellanic Clouds. We show that lowering the metallicity for the short-…
Iron abundances derived from RR Lyrae light curves and low-dispersion spectroscopy
Geza Kovacs
With the aid of the All Sky Automated Survey (ASAS) database on the Galactic field, we compare the iron abundances of fundamental mode RR Lyrae stars derived from the Fourier param…
Consistent distances from Baade-Wesselink analyses of Cepheids and RR Lyraes
G. Kovács
By using the same algorithm in the Baade-Wesselink analyses of Galactic RR Lyrae and Cepheid variables, it is shown that, within 0.03 mag (1 sigma) statistical error, they yield th…
Globular Cluster Distances and Physical Properties from Double- and Fundamental Mode Variables
G. Kovács
We briefly describe a method of obtaining relative intrinsic stellar parameters, such as absolute magnitudes and colors from the light curves of fundamental mode RR Lyrae (RRab) st…
Nonradial Pulsations in Classical Pulsators
G. Kovács
Recent analyses of photometric data on globular clusters and galaxies enabled us to study more closely the long-periodic amplitude/phase modulation (Blazhko effect) in classical va…
On the double-mode RR Lyrae variables of the Sculptor dwarf galaxy
G. Kovacs
Frequency analysis of more than 300 stars of the OGLE database on Sculptor galaxy has led to the discovery of 18 double-mode RR Lyrae (RRd) variables. This yields a 20% incidence r…
The distance modulus of the Large Magellanic Cloud based on double-mode RR Lyrae stars
G. Kovacs
We use double-mode RR Lyrae (RRd) stars from the MACHO variable star database of the Large Magellanic Cloud (LMC) to estimate its distance, by utilizing photometric data, linear pu…
The distance modulus of the Small Magellanic Cloud based on double-mode Cepheids
G. Kovacs
We employ the very recent photometric data of the OGLE project together with stellar atmosphere and linear pulsation models to determine the distance modulus of the Small Magellani…
On the Light Curve - Luminosity Relation of RR Lyrae Stars
Geza Kovacs, Johanna Jurcsik
We use a large sample of RRab stars in globular clusters and in the Sculptor dwarf galaxy to decipher the relation between the Fourier decomposition and the luminosity. For fixing…