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XMM-Newton Observations of Two Archival X-Ray Weak Type 1 Quasars: Obscuration Induced X-Ray Weakness and Variability
Brandt, W. N.; Luo, Bin; Yi, Weimin +6 more
We report XMM-Newton observations of two examples of an unclassified type of X-ray weak quasars from the Pu et al. survey of X-ray weak quasars in the Chandra archive, SDSS J083116.62+321329.6 at z = 1.797 and SDSS J142339.87+042041.1 at z = 1.702. They do not belong to the known populations of X-ray weak quasars that show broad absorption lines, …
An irradiated-Jupiter analogue hotter than the Sun
Maoz, Dan; Hallakoun, Na'ama; Leibundgut, Bruno +10 more
Planets orbiting close to hot stars experience intense extreme-ultraviolet radiation, potentially leading to atmosphere evaporation and to thermal dissociation of molecules. However, this extreme regime remains mainly unexplored due to observational challenges. Only a single known ultra-hot giant planet, KELT-9b, receives enough ultraviolet radiat…
The Similar Seven: A Set of Very Alike Exoplanets to Test Correlations between System Parameters and Atmospheric Properties
López-Morales, Mercedes; Jordán, Andrés; Brahm, Rafael +1 more
Studies of exoplanetary atmospheres have found no definite correlations between observed high-altitude aerosols and other system parameters. This could be, in part, because of the lack of homogeneous exoplanet samples for which specific parameters can be isolated and inspected. Here, we present a set of seven exoplanets with very similar system pa…
Post-outburst Evolution of Bona Fide FU Ori-type V2493 Cygnus: A Spectro-photometric Monitoring
Irawati, Puji; Pandey, Rakesh; Sharma, Saurabh +11 more
We present here the results of 8 yr of our near-simultaneous optical-near-infrared spectro-photometric monitoring of the bona fide FU Ori (FUor)-type candidate V2493 Cygnus (V2493 Cyg) starting from 2013 September to 2021 June. During our optical monitoring period (between 2015 October 16 and 2019 December 30), the V2493 Cyg is slowly dimming with…
Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable
Mukai, K.; Troja, E.; Cenko, S. B. +25 more
We present the results of our X-ray, ultraviolet, and optical follow-up campaigns of 1RXS J165424.6-433758, an X-ray source detected with the Swift Deep Galactic Plane Survey. The source X-ray spectrum (Swift and NuSTAR) is described by thermal bremsstrahlung radiation with a temperature of kT = 10.1 ± 1.2 keV, yielding an X-ray (0.3-10 keV8) lumi…
Convective blueshift strengths for 242 evolved stars
Reiners, A.; Zechmeister, M.; Jeffers, S. V. +1 more
Context. With the advent of extreme precision radial velocity (RV) surveys, seeking to detect planets at RV semi-amplitudes of 10 cm s−1, intrinsic stellar variability is the biggest challenge to detecting small exoplanets. To overcome the challenge we must first thoroughly understand all facets of stellar variability. Among those, conv…
Strong gravitational lensing by AGNs as a probe of the quasar-host relations in the distant Universe
Djorgovski, S. G.; Courbin, Frédéric; Sluse, Dominique +4 more
The tight correlations found between the mass of supermassive black holes and the luminosities, stellar masses and velocity dispersions of their host galaxies are often interpreted as a sign of their co-evolution. Studying these correlations across redshift provides a powerful insight into the evolutionary path followed by the quasar and its host …
Detection of wide binary and multiple nuclei of planetary nebulae using the Gaia DR3
Ali, A.; Khalil, J. M.; Mindil, A.
Context: this paper describes the detection of wide binary and multiple central stars (CSs) of Galactic planetary nebulae (PNe) using the most up-to-date data available from the Gaia Data Release 3 (Gaia DR3). Aims: the objective of this study is to benefit from the Gaia DR3's reliable measurements of parallax and proper motion to reveal the binar…
Geliosphere - parallel CPU and GPU based models of cosmic ray modulation in the heliosphere
Solanik, Michal; Bobík, Pavol; Genči, Ján
We present Geliosphere, a numerical model of the modulation of cosmic rays in the heliosphere. The current version of Geliosphere implements the stochastic differential equation method to solve Parker's equation. Sets of 1D and 2D models of Geliosphere solve Parker's equation in a backward-in-time manner for 2D models and in a backward-in-time and…
High-precision broadband linear polarimetry of early-type binaries. IV. The DH Cephei binary system in the open cluster of NGC 7380
Piirola, Vilppu; Berdyugin, Andrei V.; Sakanoi, Takeshi +2 more
Aims: DH Cephei is a well-known massive O+O-type binary system on the northern sky, situated at the center of young open cluster NGC 7380. Our high-precision multi-band polarimetry clearly reveals that variations of linear polarization in this system are synchronous with the phase of the orbital period. We used the observed variations of Stok…