Search Publications
The Herschel Orion Protostar Survey: Spectral Energy Distributions and Fits Using a Grid of Protostellar Models
Manoj, P.; Megeath, S. T.; Watson, D. M. +12 more
We present key results from the Herschel Orion Protostar Survey: spectral energy distributions (SEDs) and model fits of 330 young stellar objects, predominantly protostars, in the Orion molecular clouds. This is the largest sample of protostars studied in a single, nearby star formation complex. With near-infrared photometry from 2MASS, mid- and f…
Slow Solar Wind: Observations and Modeling
Li, B.; Harra, L.; Riley, P. +9 more
While it is certain that the fast solar wind originates from coronal holes, where and how the slow solar wind (SSW) is formed remains an outstanding question in solar physics even in the post-SOHO era. The quest for the SSW origin forms a major objective for the planned future missions such as the Solar Orbiter and Solar Probe Plus. Nonetheless, r…
The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence M Dwarfs
McArthur, B. E.; Benedict, G. F.; Franz, O. G. +8 more
We present a mass-luminosity relation (MLR) for red dwarfs spanning a range of masses from 0.62 {{ M }}⊙ to the end of the stellar main sequence at 0.08 {{ M }}⊙ . The relation is based on 47 stars for which dynamical masses have been determined, primarily using astrometric data from Fine Guidance Sensors (FGS) 3 and 1r, whi…
The superluminous transient ASASSN-15lh as a tidal disruption event from a Kerr black hole
Sollerman, J.; Gal-Yam, A.; Kim, S. +47 more
When a star passes within the tidal radius of a supermassive black hole, it will be torn apart1. For a star with the mass of the Sun (M ⊙) and a non-spinning black hole with a mass <108 M ⊙, the tidal radius lies outside the black hole event horizon2 and the disruption results in a luminous…
Eclipsing Binaries as Benchmarks for Trigonometric Parallaxes in the Gaia Era
Torres, Guillermo; Stassun, Keivan G.
We present fits to the broadband photometric spectral energy distributions (SEDs) of 158 eclipsing binaries (EBs) in the Tycho-2 catalog. These EBs were selected because they have highly precise stellar radii, effective temperatures, and in many cases metallicities previously determined in the literature, and thus have bolometric luminosities that…
The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
Tripp, Todd M.; Prochaska, J. Xavier; Cantalupo, Sebastiano +6 more
The total contribution of diffuse halo gas to the galaxy baryon budget strongly depends on its dominant ionization state. In this paper, we address the physical conditions in the highly ionized circumgalactic medium (CGM) traced by {{O}} {{VI}} absorption lines observed in COS-Halos spectra. We analyze the observed ionic column densities, absorpti…
The MUSCLES Treasury Survey. III. X-Ray to Infrared Spectra of 11 M and K Stars Hosting Planets
Redfield, Seth; Brown, Alexander; France, Kevin +8 more
We present a catalog of panchromatic spectral energy distributions (SEDs) for 7 M and 4 K dwarf stars that span X-ray to infrared wavelengths (5 Å -5.5 µm). These SEDs are composites of Chandra or XMM-Newton data from 5-∼50 Å, a plasma emission model from ∼50-100 Å, broadband empirical estimates from 100-1170 Å, Hubble Space Telescope data f…
SZ effects in the Magneticum Pathfinder simulation: comparison with the Planck, SPT, and ACT results
Sunyaev, R.; Dolag, K.; Komatsu, E.
We calculate the one-point probability density distribution functions (PDF) and the power spectra of the thermal and kinetic Sunyaev-Zeldovich (tSZ and kSZ) effects and the mean Compton Y parameter using the Magneticum Pathfinder simulations, state-of-the-art cosmological hydrodynamical simulations of a large cosmological volume of (896 Mpc h…
The Influence of Nonuniform Cloud Cover on Transit Transmission Spectra
Line, Michael R.; Parmentier, Vivien
We model the impact of nonuniform cloud cover on transit transmission spectra. Patchy clouds exist in nearly every solar system atmosphere, brown dwarfs, and transiting exoplanets. Our major findings suggest that fractional cloud coverage can exactly mimic high mean molecular weight atmospheres and vice versa over certain wavelength regions, in pa…
The R136 star cluster dissected with Hubble Space Telescope/STIS. I. Far-ultraviolet spectroscopic census and the origin of He II λ1640 in young star clusters
Howarth, I. D.; Angus, C. R.; Lennon, D. J. +17 more
We introduce a Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) stellar census of R136a, the central ionizing star cluster of 30 Doradus. We present low resolution far-ultraviolet STIS spectroscopy of R136 using 17 contiguous 52 arcsec × 0.2 arcsec slits which together provide complete coverage of the central 0.85 parsec (3…