Search Publications
NEMESIS: Exoplanet Transit Survey of Nearby M-dwarfs in TESS FFIs. I.
Feliz, Dax L.; Stassun, Keivan G.; Collins, Kevin I. +4 more
In this work, we present an analysis of 33,054 M-dwarf stars, located within 100 parsecs, via the Transiting Exoplanet Survey Satellite (TESS) full-frame images (FFIs) of observed sectors 1-5. We present a new pipeline called NEMESIS, developed to extract detrended photometry, and to perform transit searches of single-sector data in TESS FFIs. As …
Progenitor mass distribution for 22 historic core-collapse supernovae
Dolphin, Andrew E.; Williams, Benjamin F.; Dalcanton, Julianne J. +2 more
We infer the progenitor mass distribution for 22 historic core-collapse supernovae (CCSNe) using a Bayesian hierarchical model. For this inference, we use the local star formation histories to estimate the age for each supernova (SN). These star formation histories often show multiple bursts of star formation; our model assumes that one burst is a…
Quantifying the Lobe Reconnection Rate During Dominant IMF By Periods and Different Dipole Tilt Orientations
Østgaard, N.; Reistad, J. P.; Laundal, K. M. +5 more
Lobe reconnection is usually thought to play an important role in geospace dynamics only when the Interplanetary Magnetic Field (IMF) is mainly northward. This is because the most common and unambiguous signature of lobe reconnection is the strong sunward convection in the polar cap ionosphere observed during these conditions. During more typical …
The structure of the Milky Way based on unWISE 3.4 µm integrated photometry
Mosenkov, Aleksandr V.; Camps, Peter; Savchenko, Sergey S. +1 more
We present a detailed analysis of the Galaxy structure using an unWISE wide-field image at $3.4\,\mu$m. We perform a 3D photometric decomposition of the Milky Way taking into account (i) the projection of the Galaxy on the celestial sphere and (ii) that the observer is located within the Galaxy at the solar radius. We consider a large set of photo…
A panoramic view of the Local Group dwarf galaxy NGC 6822
Mackey, Dougal; Da Costa, Gary S.; Zhang, Shumeng
We present a panoramic survey of the isolated Local Group dwarf irregular galaxy NGC 6822. Our photometry reaches ~2-3 mag deeper than most previous studies and spans the widest area around the dwarf compared to any prior work. We observe no stellar overdensities in the outskirts of NGC 6822 to V ~ 30 mag arcsec-2 and a projected radius…
First-year ion-acoustic wave observations in the solar wind by the RPW/TDS instrument on board Solar Orbiter
Maksimovic, M.; Bale, S. D.; Chust, T. +21 more
Context. Electric field measurements of the Time Domain Sampler (TDS) receiver, part of the Radio and Plasma Waves (RPW) instrument on board Solar Orbiter, often exhibit very intense broadband wave emissions at frequencies below 20 kHz in the spacecraft frame. During the first year of the mission, the RPW/TDS instrument was operating from the firs…
Reducing Ground-based Astrometric Errors with Gaia and Gaussian Processes
Bacon, D.; Bechtol, K.; Smith, M. +65 more
Stochastic field distortions caused by atmospheric turbulence are a fundamental limitation to the astrometric accuracy of ground-based imaging. This distortion field is measurable at the locations of stars with accurate positions provided by the Gaia DR2 catalog; we develop the use of Gaussian process regression (GPR) to interpolate the distortion…
The most luminous blue quasars at 3.0 < z < 3.3. II. C IV/X-ray emission and accretion disc physics
Marconi, A.; Vignali, C.; Gilli, R. +12 more
We analyse the properties of the high-ionisation C IVλ1549 broad emission line in connection with the X-ray emission of 30 bright, optically selected quasars at z ≃ 3.0−3.3 with pointed XMM-Newton observations, which were selected to test the suitability of active galactic nuclei as cosmological tools. In our previous work, we found that a large f…
Exploring the hot gaseous halo around an extremely massive and relativistic jet launching spiral galaxy with XMM-Newton
Fabian, A. C.; Ho, L. C.; Combes, F. +6 more
We present a deep XMM-Newton observation of the extremely massive, rapidly rotating, relativistic-jet-launching spiral galaxy 2MASX J23453268-0449256. Diffuse X-ray emission from the hot gaseous halo around the galaxy is robustly detected out to a radius of 160 kpc, corresponding roughly to 35 per cent of the virial radius (≈450 kpc). We fit the X…
Probing the Cold Deep Depths of the California Molecular Cloud: The Icy Relationship between CO and Dust
Alves, João; Lada, Charles J.; Lombardi, Marco +3 more
We study the relationship between molecular gas and dust in the California Molecular Cloud over an unprecedented dynamic range of cloud depth (AV = 3-60 mag). We compare deep Herschel-based measurements of dust extinction with observations of the 12CO, 13CO, and C18O J = 2 - 1 lines on sub-parsec scales …