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Solar Toroidal Field Evolution Spanning Four Sunspot Cycles Seen by the Wilcox Solar Observatory, the Solar and Heliospheric Observatory/Michelson Doppler Imager, and the Solar Dynamics Observatory/Helioseismic and Magnetic Imager
Scherrer, Philip H.; Liu, Allison L.
Forty-four years of Wilcox Solar Observatory, 14 years of Michelson Doppler Imager on the Solar and Heliospheric Observatory, and 11 years of Helioseismic and Magnetic Imager on the Solar Dynamics Observatory magnetic field data have been studied to determine the east-west inclination-the toroidal component-of the magnetic field. Maps of the zonal…
ESASky SSOSS: Solar System Object Search Service and the case of Psyche
Valtchanov, I.; López-Caniego, M.; Küppers, M. +18 more
Context. The store of data collected in public astronomical archives across the world is continuously expanding and, thus, providing a convenient interface for accessing this information is a major concern for ensuring a second life for the data. In this context, Solar System objects (SSOs) are often difficult or even impossible to query, owing to…
Exoplanet Two-Square Degree Survey With SAO RAS Robotic Facilities
Korablev, Oleg I.; Valeev, Azamat F.; Yakovlev, Oleg Ya. +15 more
We used the 0.5-m robotic telescope located at the Special Astrophysical Observatory of the Russian Academy of Sciences for monitoring two square degrees of the sky with the aim of detecting new exoplanets. A dimming of the visible brightness is expected due to the exoplanets transiting their host stars. We analyzed about 25,000 raw images of star…
Dents in the Veil: protostellar feedback in Orion
Bally, J.; Goicoechea, J. R.; van der Tak, F. F. S. +3 more
Context. Interest in stellar feedback has recently increased because new studies suggest that radiative and mechanical feedback from young massive stars significantly regulates the physical and chemical composition of the interstellar medium. Recent SOFIA [C II] 158 µm observations of the Orion Veil have revealed that the expanding bubble is…
Massive Multi-Mission Statistical Study and Analytical Modeling of the Earth's Magnetopause: 3. An Asymmetric Non Indented Magnetopause Analytical Model
Lavraud, B.; Jeandet, A.; Aunai, N. +3 more
In a companion statistical study, we showed that the expression of the magnetopause surface as a power law of an elliptic function of the zenith angle θ holds at lunar distances, that the flaring of the magnetopause surface is influenced by the Interplanetary Magnetic Field (IMF) By component and that the IMF Bx component had…
UV Counterpart of an X-Ray Ultrafast Outflow in IRAS 17020+4544
Kriss, Gerard A.; Mehdipour, Missagh; Nicastro, Fabrizio +7 more
We report on the discovery of a UV absorption counterpart of a low-ionization X-ray ultrafast outflow (UFO) in the narrow-line Seyfert 1 galaxy IRAS 17020+4544. This UV signature of the UFO is seen as a narrow and blueshifted Lyα absorption feature in the far-UV spectrum, taken with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telesco…
Common patterns in pulse profiles of high-mass X-ray binaries
Kretschmar, P.; Caballero, I.; Fürst, F. +2 more
Context. X-ray pulsars are binary systems which consist of a neutron star in orbit with a mass donor (companion). In these systems the neutron accretes matter from the companion star, which creates accretion columns or hot spots on the neutron star surface and gives rise to pulsations in the X-ray light curve. The pulse profiles carry information …
TIC 114936199: A Quadruple Star System with a 12 Day Outer-orbit Eclipse
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +19 more
We report the discovery with TESS of a remarkable quadruple star system with a 2+1+1 configuration. The two unique characteristics of this system are that (i) the inner eclipsing binary (stars Aa and Ab) eclipses the star in the outermost orbit (star C), and (ii) these outer fourth-body eclipses last for ~12 days, the longest of any such system kn…
On the physical nature of the Wilson-Bappu effect: revising the gravity and temperature dependence
Schröder, K. -P.; Jack, D.; Rosas-Portilla, F.
We present a sample of 32 stars of spectral types G and K and luminosity classes I-V, with moderate activity levels, covering four orders of magnitude of surface gravity and a representative range of effective temperature. For each star we obtained high signal-to-noise ratio (S/N) spectra from the Telescopio Internacional de Guanajuato Robótico-Es…
Characterizing spatial variations of PAH emission in the reflection nebula NGC 1333
Peeters, E.; Wolfire, M.; Knight, C. +1 more
Infrared emission features at 3.3, 6.2, 7.7, 8.6, and 11.2 µm, attributed to polycyclic aromatic hydrocarbons (PAHs), show variations in relative intensity, shape, and peak position. These variations depend on the physical conditions of the photodissociation region (PDR) in which strong PAH emission arises but their relationship has yet to be full…