Search Publications
Missions
Journals
Publication Years
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov-Gerasimenko
Da Deppo, Vania; Lellouch, Emmanuel; Buratti, Bonnie J. +24 more
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov-Gerasimenko. This shallow pit is one of several that later formed elsewhere on the comet, all in smooth terrain that primarily …
Investigation of the negative ionospheric response of the 8 September 2017 geomagnetic storm over the European sector
Oikonomou, Christina; Haralambous, Haris; Paul, Ashik +4 more
In this study, we investigate the negative ionospheric response over the European sector during two storms that took place on 8 September 2017, primarily, by exploiting observations over ten European locations. The spatial and temporal variations of TEC, foF2 and hmF2 ionospheric characteristics are examined with the aim to explain the physical me…
Gaia search for stellar companions of TESS Objects of Interest III
Mugrauer, Markus; Michel, Kai-Uwe; Zander, Jule
The latest results from our ongoing multiplicity study of (Community) TESS Objects of Interest are presented, using astro- and photometric data from the ESA-Gaia mission, to detect stellar companions of these stars and characterize their properties. A total of 124 binary and 7 hierarchical triple star systems were detected among 2175 targets, whos…
White-dwarf asteroseismology with the TESS space telescope
Córsico, A. H.
As white-dwarf (WD) stars cool, they go through one or more stages of g(gravity)-mode pulsational instability, becoming multiperiodic variable stars. Stars passing through these instability domains allow astronomers to study their interiors through asteroseismological techniques, as if they could ``look'' at their interiors by analyzing the spectr…
First detection of AlF line emission towards M-type AGB stars
Fonfría, J. P.; Velilla-Prieto, L.; Wedemeyer, S. +3 more
The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their contribution to the total F budget is not fully known due to the lack of observations. In this paper, we report the detection of aluminium monofluoride (AlF) line emission, …
Fundamental Properties of Late-Type Stars in Eclipsing Binaries
Ribas, Ignasi; Giménez, Álvaro; Morales, Juan Carlos +1 more
Evidence from the analysis of eclipsing binary systems revealed that late-type stars are larger and cooler than predicted by models, and that this is probably caused by stellar magnetic activity. In this work, we revisit this problem taking into account the advancements in the last decade. We provide and updated a list of 32 eclipsing binary or mu…
Flaring-associated Complex Dynamics in Two M Dwarfs Revealed by Fast, Time-resolved Spectroscopy
Wang, J.; Li, H. L.; Xin, L. P. +11 more
Habitability of an exoplanet is believed to be profoundly affected by activities of the host stars, although the related coronal mass ejections (CMEs) are still rarely detected in solar-like and late-type stars. We here report an observational study on the flares of two M dwarfs triggered by the high-cadence survey performed by the Ground-based Wi…
The Paschen Jump as a Diagnostic of the Diffuse Nebular Continuum Emission in Active Galactic Nuclei
Ho, Luis C.; Brandt, William N.; Barth, Aaron J. +17 more
Photoionization modeling of active galactic nuclei (AGN) predicts that diffuse continuum (DC) emission from the broad-line region makes a substantial contribution to the total continuum emission from ultraviolet through near-infrared wavelengths. Evidence for this DC component is present in the strong Balmer jump feature in AGN spectra, and possib…
A Submillimeter Survey of Faint Galaxies behind 10 Strong Lensing Clusters
Bauer, F. E.; Barger, A. J.; Cowie, L. L. +5 more
We present deep SCUBA-2 450 µm and 850 µm imaging of 10 strong lensing clusters. We provide a >4σ SCUBA-2 850 µm catalog of the 404 sources lying within a radius of $4\buildrel{\,\prime}\over{.} 5$ from the cluster centers. We also provide catalogs of the >4.5σ Atacama Large Millimeter/submillimeter Array (ALMA) 850 µ…
Viewing Angle Observations and Effects of Evolution with Redshift, Black Hole Mass, and Eddington Ratio in Quasar-based Cosmology
Pollo, Agnieszka; Czerny, Bożena; Prince, Raj +2 more
This study is focused on the observational measurement of the viewing angle of individual quasars by modeling the broadband quasar spectrum ranging from the IR to soft X-ray band. Sources are selected from various published catalogs, and their broadband quasi-simultaneous spectral data points were collected and used for modeling. We started with a…