Search Publications
Revised planet brightness temperatures using the Planck/LFI 2018 data release
Tomasi, Maurizio; Romelli, Erik; Maris, Michele +7 more
Aims: We present new estimates of the brightness temperatures of Jupiter, Saturn, Uranus, and Neptune based on the measurements carried in 2009-2013 by Planck/LFI at 30, 44, and 70 GHz and released to the public in 2018. This work extends the results presented in the 2013 and 2015 Planck/LFI Calibration Papers, based on the data acquired in 2…
HD 63021: Chromospheric Activity and Mass Transfer in a Close Binary
Lester, Kathryn V.; Labadie-Bartz, Jonathan; Stringfellow, Guy S. +13 more
Prompted by X-ray detections from multiple surveys, we investigated the A-type star HD 63021 and found that it is a double-lined spectroscopic binary with highly variable emission associated with the primary star. Analysis of our multiepoch spectroscopic observations, the majority of which were carried out on small-aperture telescopes, indicates a…
Radio Spectral Index Analysis of Southern Hemisphere Symbiotic Stars
Sokoloski, J. L.; Vrtilek, S. D.; Dickey, John M. +2 more
Symbiotic stars show emission across the electromagnetic spectrum from a wide array of physical processes. At centimeter waves, both synchrotron and thermal emissions are seen, often highly variable and associated with outbursts in the optical and X-rays. Most models of the radio emission include an ionized region within the dense wind of the red …
Dynamics in the Transition Region beneath Active Region Upflows Viewed by IRIS
Fu, Hui; Xia, Lidong; Huang, Zhenghua +2 more
Coronal upflows at the edges of active regions (ARs), which are a possible source of slow solar wind, have been found to connect with dynamics in the transition region. To infer at what scale transition region dynamics connect to AR upflows, we investigate the statistical properties of the small-scale dynamics in the transition region underneath t…
A new framework for understanding systematic errors in cluster lens modelling - I. Selection and treatment of cluster member galaxies
Keeton, Charles R.; Raney, Catie A.; Zimmerman, Dhruv T.
With high-quality data from programs like the Hubble Frontier Fields, cluster lensing has reached the point that models are dominated by systematic rather than statistical uncertainties. We introduce a Bayesian framework to quantify systematic effects by determining how different lens modelling choices affect the results. Our framework includes a …
Methods to determine thermal sensitivity of T-SAGE instrument for MICROSCOPE mission
Métris, Gilles; Rodrigues, Manuel; Touboul, Pierre +1 more
MICROSCOPE is a space mission launched in 2016 that aims to test the validity of the Equivalence Principle (EP), the main postulate of General Relativity (GR), with a precision never reached before (Touboul et al., 2001). EP states that two bodies of different compositions and masses fall with the same acceleration in the same gravitational field.…
Astrometric measurement and reduction of Pulkovo photographic observations of the main Saturnian satellites from 1972 to 2007 in the Gaia reference frame
Narizhnaya, N. V.; Apetyan, A. A.; Bikulova, D. A. +3 more
Context. We present a remeasurement of old photographic plates, providing important raw data for dynamical studies of the Saturnian satellite system. The unprecedentedly accurate realization of the Gaia reference frame allows us to make a precise calibration of digitized astronegatives of the Saturnian satellite images.
Aims: We reprocessed 3…
Substructure analysis of the RXCJ0232.2-4420 galaxy cluster
Kale, Ruta; Parekh, Viral; Laganá, Tatiana F.
RXCJ0232.2-4420, at z = 0.28, is a peculiar system hosting a radio halo source around the cool-core of the cluster. To investigate its formation and nature, we used archival Chandra and XMM-Newton X-ray data to study the dynamical state of the cluster and detect possible substructures in the hot gas. Its X-ray surface brightness distribution shows…
Multiple Mg II Absorption Systems in the Lines of Sight to Quadruply Lensed Quasar H1413+1143
Minowa, Yosuke; Kashino, Daichi; Kashikawa, Nobunari +6 more
We find multiple Mg II absorption systems at redshift z = 1.66, 2.069, and 2.097 in the spatially resolved spectra of the quadruply gravitationally lensed quasar H1413+1143 utilizing the Kyoto tridimensional spectrograph II (Kyoto 3D II) spectrograph on board the Subaru telescope. Here we present the first measurement of differences in Mg II absor…
A Transient Coronal Sigmoid in Active Region NOAA 11909: Build-up Phase, M-class Eruptive Flare, and Associated Fast Coronal Mass Ejection
Monstein, Christian; Joshi, Bhuwan; Manoharan, P. K. +2 more
In this article, we investigate the formation and disruption of a coronal sigmoid from the active region (AR) NOAA 11909 on 07 December 2013, by analyzing multi-wavelength and multi-instrument observations. Our analysis suggests that the formation of the sigmoid initiated ≈ 1 hour before its eruption through a coupling between two twisted coronal …