Search Publications
Scattering of exocomets by a planet chain: exozodi levels and the delivery of cometary material to inner planets
Kral, Quentin; Wyatt, Mark C.; Marino, Sebastian +1 more
Exocomets scattered by planets have been invoked to explain observations in multiple contexts, including the frequently found near- and mid-infrared excess around nearby stars arising from exozodiacal dust. Here we investigate how the process of inward scattering of comets originating in an outer belt is affected by the architecture of a planetary…
Bipolar Ionization Cones in the Extended Narrow-line Region of Nearby QSO2s
Colina, L.; Elvis, M.; Storchi-Bergmann, T. +8 more
We have used narrowband [O III] λλ4959, 5007 and Hα+[N II] λλ6548, 84 Hubble Space Telescope (HST) images of nine luminous (L[O III] > 1042 erg s-1) type 2 QSOs with redshifts 0.1 < z < 0.5 in order to constrain the geometry of their extended narrow-line regions (ENLRs), as recent ground-based studies suggest that th…
CLUMP-3D: Three-dimensional Shape and Structure of 20 CLASH Galaxy Clusters from Combined Weak and Strong Lensing
Zitrin, Adi; Umetsu, Keiichi; Meneghetti, Massimo +5 more
We perform a three-dimensional triaxial analysis of 16 X-ray regular and 4 high-magnification galaxy clusters selected from the CLASH survey by combining two-dimensional weak-lensing and central strong-lensing constraints. In a Bayesian framework, we constrain the intrinsic structure and geometry of each individual cluster assuming a triaxial Nava…
ALMACAL - III. A combined ALMA and MUSE survey for neutral, molecular, and ionized gas in an H I-absorption-selected system
Smail, I.; Swinbank, A. M.; Klitsch, A. +5 more
Studying the flow of baryons into and out of galaxies is an important part of understanding the evolution of galaxies over time. We present a detailed case study of the environment around an intervening Ly α absorption line system at zabs = 0.633, seen towards the quasar J0423-0130 (zQSO = 0.915). We detect with ALMA the
The Impact of Stellar Distances on Habitable Zone Planets
Kane, Stephen R.
Among the most highly valued of exoplanetary discoveries are those of terrestrial planets found to reside within the habitable zone (HZ) of the host star. In particular, those HZ planets with relatively bright host stars will serve as priority targets for characterization observations, such as those involving mass determinations, transmission spec…
Asteroid models reconstructed from the Lowell Photometric Database and WISE data
Alí-Lagoa, V.; Hanuš, J.; Ďurech, J.
Context. Information about the spin state of asteroids is important for our understanding of the dynamical processes affecting them. However, spin properties of asteroids are known for only a small fraction of the whole population.
Aims: To enlarge the sample of asteroids with a known rotation state and basic shape properties, we combined spa…
Characterization of dust activity on Mars from MY27 to MY32 by PFS-MEX observations
Aoki, Shohei; Giuranna, Marco; Wolkenberg, Paulina +4 more
We present spatial and temporal distributions of dust on Mars from Ls = 331° in MY 26 until Ls = 80° in MY33 retrieved from the measurements taken by the Planetary Fourier Spectrometer (PFS) aboard Mars Express. In agreement with previous observations, large dust opacity is observed mostly in the southern hemisphere spring/summer and particularly …
Optical spectroscopy of local type-1 AGN LINERs
García-Burillo, S.; Balmaverde, B.; González-Martín, O. +6 more
The Balmer emission originated in the broad-line region (BLR) of active galactic nuclei (AGNs) could be either weak and difficult to detect, or even absent, for low-luminosity AGNs, as low-ionization nuclear emission-line regions (LINERs). Our goals in this paper are threefold. First, we want to explore the AGN nature of nearby type-1 LINERs. Seco…
Using Machine Learning Methods to Forecast if Solar Flares Will Be Associated with CMEs and SEPs
Karoff, Christoffer; Inceoglu, Fadil; Jeppesen, Jacob H. +3 more
Among the eruptive activity phenomena observed on the Sun, those that threaten human technology the most are flares with associated coronal mass ejections (CMEs) and solar energetic particles (SEPs). Flares with associated CMEs and SEPs are produced by magnetohydrodynamical processes in magnetically active regions (ARs) on the Sun. However, these …
A New Dark Vortex on Neptune
de Pater, Imke; Wong, Michael H.; Baranec, Christoph +12 more
An outburst of cloud activity on Neptune in 2015 led to speculation about whether the clouds were convective in nature, a wave phenomenon, or bright companions to an unseen dark vortex (similar to the Great Dark Spot studied in detail by Voyager 2). The Hubble Space Telescope (HST) finally answered this question by discovering a new dark vortex at…