Search Publications
Structural shock verification by numerical analysis of the EPD payload units on board Solar Orbiter spacecraft
Ravanbakhsh, Ali; García-Pérez, Andrés; Sorribes-Palmer, Félix +1 more
Electronic components can be seriously damaged during the launch of spacecraft due to the intense shock loads, which are generated by the launch operations such as the separations of the launcher stages and the release of the spacecraft. A shock verification program should be carried out in the development phase of space instruments to guarantee t…
Assessment of CESE-HLLD ambient solar wind model results using multipoint observation
Feng, Xueshang; Wei, Fengsi; Li, Huichao
For a three-dimensional magnetohydrodynamics solar wind model, it is necessary to carry out assessment studies to reveal its ability and limitation. In this paper, the ambient solar wind results of year 2008 generated by the CESE-HLLD 3D MHD model are compared with multipoint in-situ measurements during the late declining phase of solar cycle 23. …
Spectroscopic classification of a complete sample of astrometrically-selected quasar candidates using Gaia DR2
Milvang-Jensen, B.; Fynbo, J. P. U.; Steinhardt, C. L. +20 more
Here we explore the efficiency and fidelity of a purely astrometric selection of quasars as point sources with zero proper motions in the Gaia data release 2 (DR2). We have built a complete candidate sample including 104 Gaia-DR2 point sources, which are brighter than 20th magnitude in the Gaia G-band within one degree of the north Galactic pole (…
Active-region Tilt Angles from White-light Images and Magnetograms: The Role of Magnetic Tongues
Démoulin, Pascal; Mandrini, Cristina H.; Poisson, Mariano +1 more
The presence of elongations in active-region (AR) polarities, called magnetic tongues, is mostly visible during their emergence phase. AR tilts have been measured thoroughly using long-term white-light (WL) databases, sometimes combined with magnetic-field information. Since the influence of magnetic tongues on WL tilt measurements has not been ta…
Disk of 2MASS 15491331-3539118 = GQ Lup C as seen by HST and WISE
Alcalá, J. M.; Manara, C. F.; Frasca, A. +7 more
Aims: Very recently, a second companion on a wider orbit has been discovered around GQ Lup. This is a low-mass accreting star that is partially obscured by a disk seen at high inclination. If detected, this disk may be compared to the known disk around the primary.
Methods: We detected this disk on archive HST and WISE data.
Results…
Distortion of Magnetic Fields in BHR 71
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +9 more
The magnetic field structure of a star-forming Bok globule BHR 71 was determined based on near-infrared polarimetric observations of background stars. The magnetic field in BHR 71 was mapped from 25 stars. By using a simple 2D parabolic function, the plane-of-sky magnetic axis of the core was found to be θmag = 125° ± 11°. The plane-of-…
Is this an early stage merger? A case study on molecular gas and star formation properties of Arp 240
Wilson, C. D.; Iono, Daisuke; Saito, Toshiki +2 more
We present new high-resolution 12CO J = 1-0, J = 2-1, and 13CO J = 1-0 maps of the early stage merger Arp 240 (NGC 5257/8) obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). Simulations in the literature suggest that the merger has just completed its first passage; however, we find that this system has a l…
A Survey for C II Emission-line Stars in the Large Magellanic Cloud
Massey, Philip; Morrell, Nidia; Neugent, Kathryn F. +1 more
We present a narrowband imaging survey of the Large Magellanic Cloud (LMC), designed to isolate the C II λλ7231, 7236 emission lines in objects as faint as mλ7400 ∼ 18. The work is motivated by the recent serendipitous discovery in the LMC of the first confirmed extragalactic [WC11] star, whose spectrum is dominated by C II emission, an…
The Solar Orbiter mission
Forveille, Thierry; Shore, Steve
Time-domain Study of the Young Massive Cluster Westerlund 2 with the Hubble Space Telescope. I
Anderson, J.; Lennon, D. J.; Bastian, N. +8 more
Time-domain studies of pre-main-sequence (PMS) stars have long been used to investigate star properties during their early evolutionary phases and to trace the evolution of circumstellar environments. Historically these studies have been confined to the nearest, low-density, star-forming regions. We used the Wide Field Camera 3 on board the Hubble…