Search Publications
Relating Streamer Flows to Density and Magnetic Structures at the Parker Solar Probe
Vourlidas, Angelos; Lavraud, Benoit; Poirier, Nicolas +34 more
The physical mechanisms that produce the slow solar wind are still highly debated. Parker Solar Probe's (PSP's) second solar encounter provided a new opportunity to relate in situ measurements of the nascent slow solar wind with white-light images of streamer flows. We exploit data taken by the Solar and Heliospheric Observatory, the Solar TErrest…
Massive Warm/Hot Galaxy Coronae. II. Isentropic Model
Faerman, Yakov; Sternberg, Amiel; McKee, Christopher F.
We construct a new analytic phenomenological model for the extended circumgalactic material (CGM) of L* galaxies. Our model reproduces the O VII/O VIII absorption observations of the Milky Way (MW) and the O VI measurements reported by the COS-Halos and eCGM surveys. The warm/hot gas is in hydrostatic equilibrium in an MW gravitational potential, …
MINESweeper: Spectrophotometric Modeling of Stars in the Gaia Era
Conroy, Charlie; Ting, Yuan-Sen; Cargile, Phillip A. +4 more
We present MINESweeper, a tool to measure stellar parameters by jointly fitting observed spectra and broadband photometry to model isochrones and spectral libraries. This approach enables the measurement of spectrophotometric distances, in addition to stellar parameters such as Teff, $\mathrm{log}g$, [Fe/H], [α/Fe], and radial velocity.…
The Rotation Curve, Mass Distribution, and Dark Matter Content of the Milky Way from Classical Cepheids
Bird, Sarah A.; Zhao, Gang; Flynn, Chris +1 more
With the increasing number of large stellar survey projects, the quality and quantity of excellent tracers for studying the Milky Way are rapidly growing, one of which is the classical Cepheids. Classical Cepheids are high-precision standard candles with very low typical uncertainties (<3%) available via the mid-infrared period-luminosity relat…
High molecular gas content and star formation rates in local galaxies that host quasars, outflows, and jets
Thomson, A. P.; Alexander, D. M.; Mainieri, V. +11 more
We use a sample of powerful $z\, \approx \, 0.1$ type 2 quasars ('obscured'; log [LAGN/erg s $^{-1}]\, \gtrsim \, 45$ ), which host kpc-scale ionized outflows and jets, to identify possible signatures of AGN feedback on the total molecular gas reservoirs of their host galaxies. Specifically, we present Atacama Pathfinder EXperiment (APE…
Testing the Kerr Black Hole Hypothesis Using X-Ray Reflection Spectroscopy and a Thin Disk Model with Finite Thickness
Tripathi, Ashutosh; Abdikamalov, Askar B.; Ayzenberg, Dimitry +5 more
X-ray reflection spectroscopy is a powerful tool for probing the strong gravity region of black holes and can be used for testing general relativity in the strong field regime. Simplifications of the available relativistic reflection models limit the capability of performing accurate measurements of the properties of black holes. In this paper, we…
Annular substructures in the transition disks around LkCa 15 and J1610
Ansdell, M.; Facchini, S.; Pinilla, P. +8 more
We present high-resolution millimeter continuum ALMA observations of the disks around the T Tauri stars LkCa 15 and 2MASS J16100501-2132318 (hereafter, J1610). These transition disks host dust-depleted inner regions, which have possibly been carved by massive planets, and they are of prime interest to the study of the imprints of planet-disk inter…
The Hi-GAL catalogue of dusty filamentary structures in the Galactic plane
Umana, G.; Moore, T. J. T.; Palmeirim, P. +27 more
The recent data collected by Herschel have confirmed that interstellar structures with a filamentary shape are ubiquitously present in the Milky Way. Filaments are thought to be formed by several physical mechanisms acting from large Galactic scales down to subparsec fractions of molecular clouds, and they might represent a possible link between s…
SN2019dge: A Helium-rich Ultra-stripped Envelope Supernova
Kulkarni, S. R.; Duev, Dmitry A.; Rusholme, Ben +28 more
We present observations of ZTF18abfcmjw (SN2019dge), a helium-rich supernova with a fast-evolving light curve indicating an extremely low ejecta mass (≈0.33 M⊙) and low kinetic energy (≈1.3 × 1050 erg). Early-time (<4 days after explosion) photometry reveals evidence of shock cooling from an extended helium-rich envelope o…
Caltech-NRAO Stripe 82 Survey (CNSS). III. The First Radio-discovered Tidal Disruption Event, CNSS J0019+00
Cenko, S. B.; Kulkarni, S. R.; Hallinan, G. +8 more
We present the discovery of a nuclear transient with the Caltech-NRAO Stripe 82 Survey (CNSS), a dedicated radio transient survey carried out with the Karl G. Jansky Very Large Array (VLA). This transient, CNSS J001947.3+003527, exhibited a turn-on over a timescale of ≲1 yr, increasing in flux density at 3 GHz from <0.14 mJy in 2014 February to…