Article
Astronomy & Astrophysics
Ekrem M. Esmer, Ozgur Basturk, Tobias C. Hinse, Selim O. Selam, Alexandre C. M. Correia
Summary: The study aims to analyze eclipse timing variations in the HW Vir system to determine the properties of circumbinary planets. By using robust model selection methods and error calculation techniques, the study found the masses of the binary system and the potential circumbinary objects' parameters, showing unstable orbital configurations for the outer circumbinary object.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
S. B. Brown-Sevilla, V Nascimbeni, L. Borsato, L. Tartaglia, D. Nardiello, V Granata, M. Libralato, M. Damasso, G. Piotto, D. Pollacco, R. G. West, L. S. Colombo, A. Cunial, G. Piazza, F. Scaggiante
Summary: This study presents an analysis of 28 high-precision light curves of the controversial HW Vir eclipsing binary system, revealing that previous planetary models do not fit the new photometric data. A new approach based on a global-search genetic algorithm was developed to find two distinct families of solutions, which although fitting the observed timings well, were dynamically unstable on a 10(5)-yr time-scale. This highlights the need for caution in accepting formal solutions that may not be physically meaningful, and emphasizes the importance of continued observational and modeling efforts to understand the unexplained eclipse time variations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ekrem Murat Esmer, Ozgur Basturk, Selim Osman Selam
Summary: This study analysed the mid-eclipse timings of NY Virginis to investigate the potential circumbinary exoplanets. By modelling the available eclipse light curves and fitting a Newtonian timing model, the researchers derived orbital parameters and masses of the potential circumbinary planets. The results showed stable orbital configurations with low eccentricity, but adding a quadratic term to the model could induce eccentricity and instability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Thomas A. Baycroft, Amaury H. M. J. Triaud, Pierre Kervella
Summary: The study suggests the possibility of a circumbinary companion orbiting the common-envelope eclipsing binary HW Virginis, but previous proposed companions have lacked predictability and orbital stability. The analysis also reveals that other periodic signals are likely caused by physical processes on the white dwarf. The full Gaia epoch astrometry data release is expected to provide further confirmation of the existence of circumbinary planets and exploration of white dwarf physics around HW Virginis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Wolf, H. Kucakova, P. Zasche, K. Hornoch, J. Kara, J. Merc, M. Zejda
Summary: The study presents new observational data on three dwarf eclipsing binaries, discussing the potential existence of third bodies with short orbital periods. For SDSS J143547.87+373338.5 and NSVS 07826147, period variations can be modeled simply based on a single circumbinary object, while for NSVS 14256825, more complex behavior may be involved.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. S. Baran, R. H. Ostensen, U. Heber, A. Irrgang, S. Sanjayan, J. H. Telting, M. D. Reed, J. Ostrowski
Summary: This study provides an overview of HW-Vir type eclipsing systems based on space observations from the TESS mission. The analysis focuses on AA Doradus, with detailed examination of its properties and confirmation of stable orbital period through eclipse timing measurements. The study also suggests possible pulsations in the system, which will be confirmed or rejected with further cadence data in the future.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Huseyin Er, Aykut Ozdonmez, Ilham Nasiroglu
Summary: Several post-common envelope eclipsing binaries have been found to have variations in their orbital periods, potentially due to the presence of additional bodies in the system or other physical effects. The sdB+M eclipsing system NY Vir has shown such variations in the past decade, with recent observations indicating a new trend in the O - C diagram. Further research is needed to understand the mechanism behind these changes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ekrem Murat Esmer, Ozgur Basturk, Selim Osman Selam, Sinan Alis
Summary: This study announces the discovery of two new planetary-mass companions in the Kepler-451 binary system, which can explain the periodic variations observed. The researchers updated the orbital period and eccentricity of the middle planet and found that all three Jovian planets in the system have similar masses. The stability of the system was confirmed through a dynamical stability test.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
D. Pulley, I. D. Sharp, J. Mallett, S. von Harrach
Summary: Post-common envelope binary systems evolve when matter is transferred from the primary star to its secondary companion at a rate that cannot be accommodated. This results in the formation of a common envelope, which is subsequently ejected, leading to a binary system with a period between 2 and 3 hours. It is still unclear whether circumbinary companions form before or after the ejection of the common envelope. Through observations of eclipse timing variations, several systems with confirmed circumbinary planets have been identified. In this study, we analyze seven of these systems, discuss alternative causes, and evaluate the reliability of the eclipse timing variation methodology in identifying planetary companions. We conclude that the structure of these dynamic systems is not fully understood and that various factors contribute to the observed eclipse timing variations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Evan Fitzmaurice, David Martin, Romy Rodriguez Martinez, Patrick Vallely, Alexander P. Stephan, Kiersten M. Boley, Rick Pogge, Kareem El-Badry, Vedad Kunovac, Amaury H. M. J. Triaud
Summary: TOI-1259 is a transiting exoplanet with a bound outer white dwarf companion. Spectroscopy confirms that the white dwarf, TOI-1259B, is a DA type without evidence of heavy element pollution. The improved WD age measurement matches the gyrochronology of the main-sequence star and offers new perspectives on planets in binaries.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
David Martin, Kareem El-Badry, Vedad Kunovac, Amaury H. M. J. Triaud, Ruth Angus, Jessica Birky, Daniel Foreman-Mackey, Christina Hedges, Benjamin T. Montet, Simon J. Murphy, Alexandre Santerne, Keivan G. Stassun, Alexander P. Stephan, Ji Wang, Paul Benni, Vadim Krushinsky, Nikita Chazov, Nikolay Mishevskiy, Carl Ziegler, Abderahmane Soubkiou, Zouhair Benkhaldoun, Isabelle Boisse, Matthew Battley, Nicola J. Miller, Douglas A. Caldwell, Karen Collins, Christopher E. Henze, Natalia M. Guerrero, Jon M. Jenkins, David W. Latham, Adam Levine, Scott McDermott, Susan E. Mullally, George Ricker, Sara Seager, Avi Shporer, Andrew Vanderburg, Roland Vanderspek, Joshua N. Winn
Summary: TOI-1259Ab is a gas giant planet orbiting a K-dwarf, with a white dwarf companion in its system. Its deep transits make it a promising target for atmospheric characterization. By analyzing the age of the system through various measurements, there is consistency in the estimated total age.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Gavin B. Fezenko, Hsiang-Chih Hwang, Nadia L. Zakamska
Summary: Using Gaia data, we discovered eight new double-close-binary quadruple systems, suggesting an enhancement in the formation of short-period binaries due to the presence of wide companions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Amaury H. M. J. Triaud, Matthew R. Standing, Neda Heidari, David Martin, Isabelle Boisse, Alexandre Santerne, Alexandre C. M. Correia, Lorena Acuna, Matthew Battley, Xavier Bonfils, Andres Carmona, Andrew Collier Cameron, Pia Cortes-Zuleta, Georgina Dransfield, Shweta Dalal, Magali Deleuil, Xavier Delfosse, Joao Faria, Thierry Forveille, Nathan C. Hara, Guillaume Hebrard, Sergio Hoyer, Flavien Kiefer, Vedad Kunovac, Pierre F. L. Maxted, Eder Martioli, Nicola J. Miller, Richard P. Nelson, Mathilde Poveda, Hanno Rein, Lalitha Sairam, Stephane Udry, Emma Willett
Summary: This study reports the first successful detection of a circumbinary planet using the radial velocity method, and determines its mass. In addition, our observations demonstrate the ability of the radial velocity method to achieve precise measurements of photon noise, paving the way for future detections of more circumbinary planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Colin P. Folsom, Mihkel Kama, Tonis Eenmae, Indrek Kolka, Anna Aret, Vitalii Checha, Anni Kasikov, Laurits Leedjarv, Heleri Ramler
Summary: This study investigates an exoplanet candidate around the B6 star HD 235349, which was found to be a low-mass stellar companion instead of a planet. The primary star in this eclipsing binary system is a rare chemically peculiar star with overabundances of P, Ne, and Nd, mild overabundances of Ti and Mn, and mild underabundance of He. The lack of Hg and weak Mn overabundance suggest it may belong to the He-weak PGa star class.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
K. Gazeas, S. Zola, A. Liakos, B. Zakrzewski, S. M. Rucinski, J. M. Kreiner, W. Ogloza, M. Drozdz, D. Koziel-Wierzbowska, G. Stachowski, M. Siwak, A. Baran, D. Kjurkchieva, D. Marchev, A. Erdem, S. Szalankiewicz
Summary: This study presents the results of a spectroscopic and photometric investigation of 20 contact binary systems, revealing relationships between mass, radius, and luminosity as well as extracting new empirical power relations. About 30% of the systems show extreme values in parameters like mass ratio or fill-out factor. Some systems exhibit extremely low mass ratios or ultrashort orbital periods, indicating possible mass transfer progress. The presence of very short orbital periods confirms the slow merging process and explains why components still exist as main sequence stars in contact configurations after billions of years of evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
