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HADES RV Programme with HARPS-N at TNG. VI. GJ 3942 b behind dominant activity signals
Rebolo, R.; Ribas, I.; Morales, J. C. +29 more
Context. Short- to mid-term magnetic phenomena on the stellar surface of M-type stars can resemble the effects of planets in radial velocity data, and may also hide them.
Aims: We analyze 145 spectroscopic HARPS-N observations of GJ 3942 taken over the past five years and additional photometry in order to disentangle stellar activity effects …
XMM-Newton observation of MV Lyr and the sandwiched model confirmation
Ness, J. -U.; Dobrotka, A.; Nucita, A. A. +1 more
We present spectral and timing analyses of simultaneous X-ray and UV observations of the VY Scl system MV Lyr taken by XMM-Newton, containing the longest continuous X-ray + UV light curve and highest signal-to-noise X-ray (EPIC) spectrum to date. The RGS spectrum displays emission lines plus continuum, confirming model approaches to be based on th…
HD 164492C: a rapidly rotating, Hα-bright, magnetic early B star associated with a 12.5 d spectroscopic binary
Rivinius, Th.; Wade, G. A.; Alecian, E. +6 more
We employ high-resolution spectroscopy and spectropolarimetry to derive the physical properties and magnetic characteristics of the multiple system HD 164492C, located in the young open cluster M20. The spectrum reveals evidence of three components: a broad-lined early B star (HD 164492C1), a narrow-lined early B star (HD 164492C2) and a late B st…
D/H Ratios on Saturn and Jupiter from Cassini CIRS
Fletcher, L. N.; Lellouch, E.; Irwin, P. G. J. +7 more
We present new measurements of the deuterium abundance on Jupiter and Saturn, showing evidence that Saturn's atmosphere contains less deuterium than Jupiter's. We analyzed far-infrared spectra from the Cassini Composite Infrared Spectrometer to measure the abundance of HD on both giant planets. Our estimate of the Jovian D/H = (2.95 ± 0.55) × 10
Search for Hydrogenated C60 (Fulleranes) in Circumstellar Envelopes
Zhang, Yong; Kwok, Sun; Sadjadi, SeyedAbdolreza +1 more
The recent detection of fullerene (C60) in space and the positive assignment of five diffuse interstellar bands to {{{C}}}60+ reinforce the notion that fullerene-related compounds can be efficiently formed in circumstellar envelopes and be present in significant quantities in the interstellar medium. Experimental s…
The Relation Between Magnetic Fields and X-ray Emission for Solar Microflares and Active Regions
Kirichenko, A. S.; Bogachev, S. A.
We present the result of a comparison between magnetic field parameters and the intensity of X-ray emission for solar microflares with Geosynchronous Operational Environmental Satellites (GOES) classes from A0.02 to B5.1. For our study, we used the monochromatic MgXII Imaging Spectroheliometer (MISH), the Full-disk EUV Telescope (FET), and the Sol…
Proper Motions of Jets on the Kiloparsec Scale: New Results with HST
Anderson, Jay; Sparks, William B.; Georganopoulos, Markos +7 more
The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we are now able to reach accuracies in proper-motion measurements on the order of a tenth of a mill…
The Radial Distributions of the Two Main-sequence Components in the Young Massive Star Cluster NGC 1856
Milone, Antonino P.; Deng, Licai; de Grijs, Richard +1 more
The recent discovery of double main sequences in the young, massive star cluster NGC 1856 has caught significant attention. The observations can be explained by invoking two stellar generations with different ages and metallicities or by a single generation of stars composed of two populations characterized by different rotation rates. We analyzed…
Background derivation and image flattening: getimages
Men'shchikov, A.
Modern high-resolution images obtained with space observatories display extremely strong intensity variations across images on all spatial scales. Source extraction in such images with methods based on global thresholding may bring unacceptably large numbers of spurious sources in bright areas while failing to detect sources in low-background or l…
Nitric oxide nightglow and Martian mesospheric circulation from MAVEN/IUVS observations and LMD-MGCM predictions
Forget, F.; Montmessin, F.; González-Galindo, F. +19 more
We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter, the southern hemisphere during fall equinox, and equatorial latitudes during summer in the northern hemisphere based on observations of the δ and γ bands between 190 and 270 nm by the Imaging UltraViolet Spectrograph (IUVS) on the Mars Atmo…