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Counter-evidence against multiple frequency nature of 0.75 mHz oscillation in V4743 Sgr
Ness, J. -U.; Dobrotka, A.
All X-ray light curves of nova V4743 Sgr (2002), taken during and after outburst, contain a 0.75 mHz periodic signal that can most plausibly be interpreted as being excited by the rotation of the white dwarf in an intermediate polar system. This interpretation faces the challenge of an apparent multifrequency nature of this signal in the light cur…
The cislunar low-thrust trajectories via the libration point
Qu, Qingyu; Xu, Ming; Peng, Kun
The low-thrust propulsion will be one of the most important propulsion in the future due to its large specific impulse. Different from traditional low-thrust trajectories (LTTs) yielded by some optimization algorithms, the gradient-based design methodology is investigated for LTTs in this paper with the help of invariant manifolds of
Unveiling the AGN in IC 883: discovery of a parsec-scale radio jet
Bondi, M.; Muxlow, T. W. B.; Argo, M. K. +12 more
IC 883 is a luminous infrared galaxy (LIRG) classified as a starburst-active galactic nucleus (AGN) composite. In a previous study, we detected a low-luminosity AGN (LLAGN) radio candidate. Here, we report on our radio follow-up at three frequencies that provides direct and unequivocal evidence of the AGN activity in IC 883. Our analysis of archiv…
Evidence of a non-conservative mass transfer for XTE J0929-314
Sanna, A.; Di Salvo, T.; Burderi, L. +5 more
Context. In 1998 the first accreting millisecond pulsar, SAX J1808.4-3658, was discovered and to date 18 systems showing coherent, high frequency (>100 Hz) pulsations in low-mass X-ray binaries are known. Since their discovery, this class of sources has shown interesting and sometimes puzzling behaviours. In particular, apart from a few excepti…
Relative outflow enhancements during major geomagnetic storms - Cluster observations
Nilsson, Hans; Slapak, Rikard; Schillings, Audrey +2 more
The rate of ion outflow from the polar ionosphere is known to vary by orders of magnitude, depending on the geomagnetic activity. However, the upper limit of the outflow rate during the largest geomagnetic storms is not well constrained due to poor spatial coverage during storm events. In this paper, we analyse six major geomagnetic storms between…
High-Resolution Vector Magnetograms of the Sun's Poles from Hinode: Flux Distributions and Global Coronal Modeling
Petrie, Gordon
The Sun's polar fields play a leading role in structuring the large-scale solar atmosphere and in determining the interplanetary magnetic field. They are also believed to supply the seed field for the subsequent solar activity cycle. However, present-day synoptic observations do not have sufficient spatial resolution or sensitivity to diagnose acc…
Properties of the Closest Young Binaries. I. DF Tau’s Unequal Circumstellar Disk Evolution
Prato, L.; Schaefer, G.; Simon, M. +6 more
We present high-resolution, spatially resolved, near-infrared spectroscopy and imaging of the two components of DF Tau, a young, low-mass, visual binary in the Taurus star-forming region. With these data, we provide a more precise orbital solution for the system, determine component spectral types, radial velocity, veiling and v\sin i values, and …
Unusual void galaxy DDO 68: implications of the HST-resolved photometry
Makarova, L. N.; Makarov, D. I.; Pustilnik, S. A. +1 more
DDO 68 (UGC 5340) is an unusual dwarf galaxy with extremely low gas metallicity [12 + log (O/H) = 7.14] residing in the nearby Lynx-Cancer void. Despite its apparent isolation, it shows both optical and H I morphological evidence for strong tidal disturbance. Here, we study the resolved stellar populations of DDO 68 using deep images from the HST …
Sudden Penumbral Reappearance and Umbral Motion Induced by an M7.9 Solar Flare
Yang, Jiayan; Hong, Junchao; Xu, Zhe +2 more
The sudden flare-related changes of sunspot structures have been recognized as the photospheric responses to the solar eruptions in the corona. In this study, we report two distinctive sunspots variations associated with the flare SOL2015-06-25T08:16 (M7.9). Along the flaring polarity inversion line (PIL), the originally decayed penumbra showed a …
Statistical study of the alteration of the magnetic structure of magnetic clouds in the Earth's magnetosheath
Escoubet, C. P.; Kilpua, E. K. J.; Turc, L. +2 more
The magnetosheath plays a central role in the solar wind-magnetospheric coupling. Yet the effects of its crossing on solar wind structures such as magnetic clouds (MCs) are generally overlooked when assessing their geoeffectivity. Using 82 MCs observed simultaneously in the solar wind and the magnetosheath, we carry out the first statistical study…