Search Publications
A Layered Debris Disk around M Star TWA 7 in Scattered Light
Stark, Christopher C.; Debes, John H.; Roberge, Aki +15 more
We have obtained Hubble Space Telescope (HST) coronagraphic observations of the circumstellar disk around M star TWA 7 using the Space Telescope Imaging Spectrograph (STIS) instrument in visible light. Together with archival observations, including HST/NICMOS using the F160W filter and Very Large Telescope/SPHERE at the H-band in polarized light, …
Measurement of Magnetic Field Fluctuations in the Parker Solar Probe and Solar Orbiter Missions
Maksimovic, M.; Bale, S. D.; Krasnoselskikh, V. +17 more
The search coil magnetometer (SCM) measures the magnetic signature of solar wind fluctuations with three components in the 3 Hz-50 kHz range and one single component in the 1 kHz-1 MHz range. This instrument is important for providing in situ observations of transients caused by interplanetary shocks and reconnection, for the identification of ele…
The dust mass in Cassiopeia A from infrared and optical line flux differences
De Looze, I.; Barlow, M. J.; Milisavljevic, D. +2 more
The large quantities of dust that have been found in a number of high-redshift galaxies have led to suggestions that core-collapse supernovae (CCSNe) are the main sources of their dust and have motivated the measurement of the dust masses formed by local CCSNe. For Cassiopeia A (Cas A), an oxygen-rich remnant of a Type IIb CCSN, a dust mass of 0.6…
The Nuclear Star Cluster and Nuclear Stellar Disk of the Milky Way: Different Stellar Populations and Star Formation Histories
Neumayer, Nadine; Schödel, Rainer; Nogueras-Lara, Francisco
The Milky Way's nuclear stellar disk (NSD) and nuclear star cluster (NSC) are the main features of the Galactic center. Nevertheless, their observation is hampered by the extreme source crowding and high extinction. Hence, their relation and formation scenario are not fully clear yet. We aim to detect the stellar populations from the NSC and the N…
The rapid transition from star formation to AGN-dominated rest-frame ultraviolet light at z ≃ 4
Häußler, B.; Bowler, R. A. A.; Jarvis, M. J. +1 more
With the advent of deep optical-to-near-infrared extragalactic imaging on the degree scale, samples of high-redshift sources are being selected that contain both bright star-forming (SF) galaxies and faint active galactic nuclei (AGN). In this study, we investigate the transition between SF- and AGN-dominated systems at z ≃ 4 in the rest-frame ult…
Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling
Vincentelli, F. M.; Casella, P.; Maccarone, T. +7 more
We present the results regarding the analysis of the fast X-ray/infrared (IR) variability of the black hole transient MAXI J1535-571. The data studied in this work consist of two strictly simultaneous observations performed with XMM-Newton (X-rays: 0.7-10 keV), VLT/HAWK-I (Ks band, 2.2 µm) and VLT/VISIR (M and PAH2_2 bands, 4.85 a…
Disk Masses and Dust Evolution of Protoplanetary Disks around Brown Dwarfs
Espaillat, Catherine C.; Rilinger, Anneliese M.
We present the largest sample of brown dwarf (BD) protoplanetary disk spectral energy distributions modeled to date. We compile 49 objects with ALMA observations from four star-forming regions: ρ Ophiuchus, Taurus, Lupus, and Upper Scorpius. Studying multiple regions with various ages enables us to probe disk evolution over time. Specifically, fro…
The First Retrieval of a Substellar Subdwarf: A Cloud-free SDSS J125637.13-022452.4
Gonzales, Eileen C.; Marley, Mark; Faherty, Jacqueline K. +5 more
We present the first retrieval analysis of a substellar subdwarf, SDSS J125637.13-022452.4 (SDSS J1256-0224), using the Brewster retrieval code base. We find SDSS J1256-0224 is best fit by a cloud-free model with an ion (neutral H, H-, and electron) abundance corresponding to ${\left[\mathrm{Fe}/{\rm{H}}\right]}_{\mathrm{ion}}=-1.5$ . H…
Seasonal and Geographical Variability of the Martian Ionosphere From Mars Express Observations
González-Galindo, F.; Němec, F.; Tellmann, S. +4 more
We study the seasonal and geographical variability of the peak electron density and the altitude of the main ionospheric peak at Mars. For this purpose, we use the data obtained by the ESA Mars Express mission, namely by the radar MARSIS and the radio occultation experiment MaRS. The accumulation of data during the long lifetime of Mars Express pr…
Multiscale views of an Alfvénic slow solar wind: 3D velocity distribution functions observed by the Proton-Alpha Sensor of Solar Orbiter
André, N.; Fedorov, A.; Livi, S. +29 more
Context. The Alfvénic slow solar wind is of particular interest, as it is often characterized by intense magnetic turbulence, complex proton 3D velocity distribution functions (VDF), and an ensuing richness of kinetic and dynamic processes.
Aims: We take advantage of the fast time cadence of measurements taken by the Proton-Alpha Sensor (PAS)…