Search Publications
The eROSITA Final Equatorial-Depth Survey (eFEDS). The first archetypal quasar in the feedback phase discovered by eROSITA
Silverman, J. D.; Georgakakis, A.; Salvato, M. +18 more
Theoretical models of the co-evolution of galaxies and active galactic nuclei (AGNs) ascribe an important role in the feedback process to a short, luminous, obscured, and dust-enshrouded phase during which the accretion rate of the supermassive black hole is expected to be at its maximum and the associated AGN-driven winds are also predicted to be…
The Accretion Process in the DQ Tau Binary System
Ábrahám, P.; Kóspál, Á.; Fiorellino, E. +1 more
Mass accretion from the circumstellar disk onto the protostar is a fundamental process during star formation. Measuring the mass accretion rate is particularly challenging for stars belonging to binary systems, because it is often difficult to discriminate which component is accreting. DQ Tau is an almost equal-mass spectroscopic binary system whe…
Three-dimensional magnetic fields of molecular clouds
Tahani, Mehrnoosh
To investigate the role of magnetic fields in the evolution of the interstellar medium, formation and evolution of molecular clouds, and ultimately the formation of stars, their three-dimensional (3D) magnetic fields must be probed. Observing only one component of magnetic fields (along the line of sight or parallel to the plane of the sky) is ins…
Binaries with Possible Compact Components Discovered from the LAMOST Time-domain Survey of Four K2 Plates
Liu, Jifeng; Zhang, Haotong; Wang, Song +4 more
Time-domain spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) can provide accurate and high-cadence radial velocities (RVs). In this work, we search for binaries with compact components with the RV monitoring method by using the LAMOST time-domain survey of four K2 plates. Three binary systems including…
A strong H− opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b
Schlawin, E.; Pino, L.; Désert, J. -M. +11 more
We present the analysis of a spectroscopic secondary eclipse of the hottest transiting exoplanet detected to date, KELT-9b, obtained with the Wide Field Camera 3 aboard the Hubble Space Telescope. We complement these data with literature information on stellar pulsations and Spitzer/Infrared Array Camera and Transiting Exoplanet Survey Satellite e…
Discovery of 16 New Members of the Solar Neighborhood Using Proper Motions from CatWISE2020
Meisner, Aaron M.; Kirkpatrick, J. Davy; Schneider, Adam C. +15 more
In an effort to identify nearby and unusual cold objects in the solar neighborhood, we searched for previously unidentified moving objects using CatWISE2020 proper motion data combined with machine learning methods. We paired the motion candidates with their counterparts in 2MASS, UHS, and VHS. Then we searched for white dwarf, brown dwarf, and su…
Independent Evidence for Earlier Formation Epochs of Fossil Groups of Galaxies through the Intracluster Light: The Case for RX J100742.53+380046.6
Koekemoer, Anton M.; Dupke, Renato A.; Carrasco, Eleazar R. +9 more
Fossil groups (FG) of galaxies still present a puzzle to theories of structure formation. Despite the low number of bright galaxies, they have relatively high velocity dispersions and ICM temperatures often corresponding to cluster-like potential wells. Their measured concentrations are typically high, indicating early formation epochs as expected…
H2O distribution in the disc of HD 100546 and HD 163296: the role of dust dynamics and planet-disc interaction
Lodato, G.; Fedele, D.; van Dishoeck, E. F. +3 more
Water plays a fundamental role in the formation of planets and their atmospheres. Far-infrared observations with the Herschel Space Observatory revealed a surprisingly low abundance of cold-water reservoirs in protoplanetary discs. On the other hand, a handful of discs show emission of hot water transitions excited at temperatures above a few hund…
An Adaptive Optics Census of Companions to Northern Stars Within 25 pc with Robo-AO
Baranec, Christoph; Law, Nicholas M.; Riddle, Reed +8 more
In order to assess the multiplicity statistics of stars across spectral types and populations in a volume-limited sample, we censused nearby stars for companions with Robo-AO. We report on observations of 1157 stars of all spectral types within 25 pc with decl. >-13° searching for tight companions. We detected 154 companion candidates with sepa…
Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
Schultheis, M.; Minniti, D.; Valentini, M. +19 more
The central part of the Galaxy hosts a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner halo, inner thick disc, inner thin disc, as well as debris from past accretion events. We identified a sample of 58 candidate stars belonging to the stellar population o…