Search Publications
Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
Smolec, R.; Thompson, I. B.; Villanova, S. +17 more
Aims: Our goal is to determine, with high accuracy, the physical and orbital parameters of two double-lined eclipsing binary systems, where the components are two giant stars. We also aim to study the evolutionary status of the binaries, to derive the distances towards them by using a surface brightness-colour relation, and to compare these m…
CORALIE radial velocity search for companions around evolved stars (CASCADES). II. Seismic masses for three red giants orbited by long-period massive planets
Buldgen, G.; Eggenberger, P.; Ségransan, D. +10 more
Context. The advent of asteroseismology as the golden path to precisely characterize single stars naturally led to synergies with the field of exoplanetology. Today, the precise determination of stellar masses, radii and ages for exoplanet-host stars is a driving force in the development of dedicated software and techniques to achieve this goal. H…
Development of Chaos Terrain as Subaqueous Slide Blocks in Galilaei Crater, Mars
Nizam, Nabila; Divola, Claire; Day, Mackenzie +2 more
Chaos terrain, expressed as enigmatic blocky landscapes on Mars, has poorly understood origins. Several hypotheses have been put forward to explain chaos terrain formation, but none fully account for the morphologies observed in Galilaei crater, the focus of this study. Previously inferred to be a paleolake, Galilaei crater hosts chaos terrain com…
The evolutionary state of the chemically peculiar members of the open cluster NGC 2516
Hubrig, S.; Schöller, M.; Piskunov, A. E. +1 more
We aim at establishing safe membership and evolutionary status of 11 chemically peculiar (CP) stars that are residing in the domain of the open cluster NGC 2516 and are frequently referred to as cluster members. We queried the Gaia EDR3 catalogue in an area with a radius of 1° and selected 37 508 stars brighter than G = 19 mag. The cluster members…
Improving Multiday Solar Wind Speed Forecasts
Arge, C. N.; Henney, C. J.; Dayeh, M. A. +4 more
We analyze the residual errors for the Wang-Sheeley-Arge (WSA) solar wind speed forecasts as a function of the photospheric magnetic field expansion factor (fp) and the minimum separation angle (d) in the photosphere between the footpoints of open field lines and the nearest coronal hole boundary. We find the map of residual speed error…
C,T1,T2: A Complementary Method to Detect Multiple Populations with the Washington Filter System
Geisler, D.; Villanova, S.; Frelijj, H. +1 more
In this research we test the ability of a three Washington filter combination, (C − T1) − (T1 − T2), compared with that of the traditional C − T1 color to find multiple populations on two globular clusters: NGC 7099 and NGC 1851, types I and II Globular clusters, respectively. Our improved photometry and…
XMM-Newton detection of soft time lags in the TDE candidate AT 2018fyk
Zhang, Wenda
In this letter, we report a tentative detection of soft time lags (i.e. variability of softer photons lags behind the variability of harder photons) in one XMM-Newton observation of the tidal disruption event (TDE) candidate AT 2018fyk while the source was in the hard spectral state. The lags are detected at $6.51\times 10^{-5}~\rm Hz$. The amplit…
Geology of the Crüger-Sirsalis Basin: Evidence for prolonged volcanism in the southwestern near side of the Moon
Bhatt, Megha; Bhardwaj, Anil; Srivastava, Neeraj +1 more
The Pre-Nectarian Crüger-Sirsalis Basin (centered at 16.0°S, 293.0°E; ~ 475 km in diameter) is a primarily degraded and obscured impact basin on the Moon. This study presents the first geological description of the Crüger-Sirsalis Basin using remote sensing datasets from Lunar Reconnaissance Orbiter (LRO), Chandrayaan-1, and Kaguya missions. An in…
On the Status of the Star Schulte 12 in the Association Cyg OB2
Klochkova, V. G.; Panchuk, V. E.; Islentieva, E. S.
High-resolution spectra of the LBV candidate Schulte 12 in the Cyg OB2 association were obtained at the 6-m BTA telescope with the NES echelle spectrograph on the arbitrary dates in 2001-2022. Variability of the emission profile of Hα and absorptions of He I, Si II with time was found. Based on the radial velocity measurements at 10 obs…
Activity of the Young Star with an Exoplanet Kepler-1627
Savanov, I. S.
Based on data from the Kepler Space Telescope archive, we have studied the photometric variability of the young solar analog Kepler-1627, a G8V-type star with a planet of 3.777 Earth radii in size and an orbital period ${∼}$7.2 days. Kepler-1627 is a member of the $δ$ Lyr cluster with an age of 38 Myr and is currently the system with the youngest …