Search Publications
Analytic modeling of recurrent Forbush decreases caused by corotating interaction regions
Vršnak, B.; Dumbović, M.; Heber, B. +1 more
Context. On scales of days, the galactic cosmic ray (GCR) flux is affected by coronal mass ejections and corotating interaction regions (CIRs), causing so-called Forbush decreases and recurrent Forbush decreases (RFDs), respectively.
Aims: We explain the properties and behavior of RFDs recorded at about 1 au that are caused by CIRs generated …
On the Characterization of GJ 504: A Magnetically Active Planet-host Star Observed by the Transiting Exoplanet Survey Satellite (TESS)
Stassun, Keivan G.; García, Rafael A.; Corsaro, Enrico +11 more
We present the results of the analysis of the photometric data collected in long- and short-cadence mode by the Transiting Exoplanet Survey Satellite for GJ 504, a well-studied planet-hosting solar-like star, whose fundamental parameters have been largely debated during the last decade. Several attempts have been made by the present authors to iso…
Numerical simulations of radar echoes rule out basal CO2 ice deposits at Ultimi Scopuli, Mars
Orosei, Roberto; Cartacci, Marco; Cicchetti, Andrea +10 more
The principal objective of the radar sounder MARSIS experiment is to look for ice and water in the Martian subsurface. One particular focus of investigations, since 2005, has been the search for basal liquid water in the south polar layered deposits (SPLD). Anomalously strong basal echoes detected from four distinct areas at the base of the deposi…
Using Multiple Emission Line Ratios to Constrain the Slope of the Dust Attenuation Law
Papovich, Casey; Cleri, Nikko J.; Trump, Jonathan R. +2 more
We explore the possibility and practical limitations of using a three-line approach to measure both the slope and normalization of the dust attenuation law in individual galaxies. To do this, we focus on a sample of 11 galaxies with existing ground-based Balmer Hα and Hβ measurements from slit spectra, plus space-based grism constraints on Paschen…
The Missing Metal Problem in Galaxy Clusters: Characterizing the Early Enrichment Population
Bregman, Joel N.; Blackwell, Anne E.; Snowden, Steven L.
Rich and poor galaxy clusters have the same measured halo metallicity, 0.35-0.4 Z ⊙, even though they are an order of magnitude apart in stellar fraction, M */M gas. The measured intracluster medium (ICM) metallicity in high-mass clusters cannot be explained by the visible stellar population as stars typically make…
HORuS transmission spectroscopy and revised planetary parameters of KELT-7 b
Rebolo, R.; del Burgo, C.; Montes, D. +7 more
We report on the high-resolution spectroscopic observations of two planetary transits of the hot Jupiter KELT-7b (Mp = 1.28 ± 0.17MJup, Teq = 2028 K) observed with the High Optical Resolution Spectrograph (HORuS) mounted on the 10.4-m Gran Telescopio Canarias (GTC). A new set of stellar parameters are obtained for …
Galaxy Rotation Parameters from OB2 Stars with Proper Motions and Parallaxes from the Gaia EDR3 Catalog
Bobylev, V. V.; Bajkova, A. T.
We have analyzed the kinematics of OB2 stars with proper motions and parallaxes selected by Xu et al. from the Gaia EDR3 catalog. The relative parallax errors for all the stars in this sample do not exceed 10%. Based on a sample of 9750 stars, the group velocity components ${{(U,V,W)}_{ \odot }} = $ (7.21, 7.46, 8.52) ± (0.13, 0.20, 0.10) km/s wer…
Spectroscopic observation of a transition region network jet
Peter, H.; Chitta, L. P.; Gorman, J.
Aims: Ubiquitous transition region (TR) network jets are considered to be substantial sources of mass and energy to the corona and solar wind. We conduct a case study of a network jet to better understand the nature of mass flows along its length and the energetics involved in its launch.
Methods: We present an observation of a jet with …
HD 60431, the CP2 star with the shortest rotational period. Physical parameters and period analysis
Paunzen, E.; Bernhard, K.; Hümmerich, S. +5 more
Context. CP2 stars show periodic photometric, spectroscopic, and magnetic variations with the rotational period. They are generally slow rotators, with rotational periods exceeding half a day, except for the late B-type star HD 60431, which has an unusually short rotational period of 0.4755 days. As slow rotation is deemed a necessary criterion fo…
ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI
Gies, Douglas R.; Monnier, John D.; Lanthermann, Cyprien +18 more
We started a survey with CHARA/MIRC-X and VLTI/GRAVITY to search for low-mass companions orbiting individual components of intermediate-mass binary systems. With the incredible precision of these instruments, we can detect astrometric "wobbles" from companions down to a few tens of microarcseconds. This allows us to detect any previously unseen tr…