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ODEA: Orbital Dynamics in a complex Evolving Architecture. Application to the planetary system HD 106906
De Rosa, R. J.; Lagrange, A. -M.; Beust, H. +3 more
Context. Mixed-variable symplectic integrators are widely used in orbital dynamics. However, they have been developed for Solar system-type architectures, and can not handle evolving hierarchy, in particular in systems with two or more stellar components. Such configuration may have occurred in the history of HD 106906, a tight pair of F-type star…
Lack of close-in, massive planets of main-sequence A-type stars from Kepler
Skarka, Marek; Grziwa, Sascha; Guenther, Eike W. +5 more
Some theories of planet formation and evolution predict that intermediate-mass stars host more hot Jupiters than Sun-like stars, others reach the conclusion that such objects are very rare. By determining the frequencies of those planets we can test those theories.
Ionization age of iron ejecta in the Galactic Type Ia supernova remnant G306.3-0.9
Uchida, Hiroyuki; Bamba, Aya; Tsuru, Takeshi Go +5 more
We present a 190 ks observation of the Galactic supernova remnant (SNR) G306.3-0.9 with Suzaku. To study ejecta properties of this possible Type Ia SNR, the absolute energy-scale at the Fe-K band was calibrated to a level of uncertainty less than 10 eV by a cross-calibration with the Hitomi microcalorimeter using the Perseus cluster spectra. This …
Colorado Ultraviolet Transit Experiment data simulator
France, Kevin; Rüdisser, Hannah T.; Koskinen, Tommi +5 more
The Colorado Ultraviolet Transit Experiment (CUTE) is a 6U NASA CubeSat carrying on board a low-resolution (R ∼ 2000 to 3000), near-UV (2500 to 3300 Å) spectrograph. It has a rectangular primary Cassegrain telescope to maximize the collecting area. CUTE, which is planned for launch in spring 2020, is designed to monitor transiting extra-solar plan…
Evidence of Interacting Elongated Filaments in the Star-forming Site AFGL 5142
Dewangan, L. K.; Ojha, D. K.; Baug, T. +1 more
To probe the ongoing physical mechanism, we studied a wide-scale environment around AFGL 5142 (area ∼25 pc × 20 pc) using a multiwavelength approach. The Herschel column density (N(H2)) map reveals a massive inverted Y-like structure (mass ∼6280 M ⊙), which hosts a pair of elongated filaments (lengths >10 pc). The Herschel…
New Insights into Interstellar Object 1I/2017 U1 (‘Oumuamua) from SOHO/STEREO Nondetections
Knight, Matthew M.; Hui, Man-To
Object 1I/2017 U1 (‘Oumuamua) is the first interstellar small body ever discovered in the solar system. By the time of discovery, it had already passed perihelion. To investigate the behavior of ‘Oumuamua around perihelion, we searched for it in Solar and Heliospheric Observatory (SOHO) and Solar TErrestrial RElations Observatory (STEREO) images f…
Updated orbital ephemeris of the ADC source X 1822-371: a stable orbital expansion over 40 years
Sanna, A.; Tailo, M.; Di Salvo, T. +6 more
Aims: Source
The 82nd Name-List of Variable Stars. Part I - RA 0hr to 18hr, Novae and Globular-cluster Variables
Pastukhova, E. N.; Khruslov, A. V.; Samus, N. N. +3 more
We present the first part of a new Name-List of variable stars containing information on 1291 variable stars recently designated in the system of the General Catalogue of Variable Stars. With the exception of Novae and other unusual variables named upon request from the IAU CBAT or by our initiative, these stars are in the range of J2000.0 right a…
The dynamic chromosphere: Pushing the boundaries of observations and models
Pereira, Tiago M. D.
The interface between the bright solar surface and the million-degree corona continues to hold the key to many unsolved problems in solar physics. Advances in instrumentation now allow us to observe the dynamic structures of the solar chromosphere down to less than 0.″1 with cadences of just a few seconds and in multiple pola…
Observations of X‑ray reverberation around black holes
Ponti, G.; De Marco, B.
The X‑ray emission from accreting black hole (BH) systems displays strong variability. Short reverberation lags are expected between the primary hard X‑ray continuum and the reprocessed disk emission. These lags depend on light‑travel distances, thus offering the opportunity to map the geometry of the innermost accretion flow. X‑ray reverberation …