Search Publications
The Influence of the Extreme Ultraviolet Spectral Energy Distribution on the Structure and Composition of the Upper Atmosphere of Exoplanets
Guo, J. H.; Ben-Jaffel, Lotfi
By varying the profiles of stellar extreme ultraviolet (EUV) spectral energy distributions (SEDs), we tested the influences of stellar EUV SEDs on the physical and chemical properties of an escaping atmosphere. We apply our model to study four exoplanets: HD 189733b, HD 209458b, GJ 436b, and Kepler-11b. We find that the total mass loss rates of an…
Toward Precision Black Hole Masses with ALMA: NGC 1332 as a Case Study in Molecular Disk Dynamics
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +4 more
We present first results from a program of Atacama Large Millimeter/submillimeter Array (ALMA) CO(2-1) observations of circumnuclear gas disks in early-type galaxies. The program was designed with the goal of detecting gas within the gravitational sphere of influence of the central black holes (BHs). In NGC 1332, the 0.″3-resolution ALMA data reve…
The Thermal State of KS 1731-260 after 14.5 years in Quiescence
Homan, Jeroen; Miller, Jon M.; Cackett, Edward M. +7 more
Crustal cooling of accretion-heated neutron stars provides insight into the stellar interior of neutron stars. The neutron star X-ray transient, KS 1731-260, was in outburst for 12.5 years before returning to quiescence in 2001. We have monitored the cooling of this source since then through Chandra and XMM-Newton observations. Here we present a 1…
Mass-loading of the solar wind at 67P/Churyumov-Gerasimenko. Observations and modelling
Holmström, M.; Behar, E.; Nilsson, H. +4 more
Context. The first long-term in-situ observation of the plasma environment in the vicinity of a comet, as provided by the European Rosetta spacecraft.
Aims: Here we offer characterisation of the solar wind flow near 67P/Churyumov-Gerasimenko (67P) and its long term evolution during low nucleus activity. We also aim to quantify and interpret t…
ALMA Observations of Lyα Blob 1: Halo Substructure Illuminated from Within
Taniguchi, Y.; Clements, D. L.; Avison, A. +26 more
We present new Atacama Large Millimeter/Submillimeter Array (ALMA) 850 µm continuum observations of the original Lyα Blob (LAB) in the SSA22 field at z = 3.1 (SSA22-LAB01). The ALMA map resolves the previously identified submillimeter source into three components with a total flux density of S 850 = 1.68 ± 0.06 mJy, corresponding …
Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin I and P/sin I for a Large Sample of Late-K and M Dwarfs
Mullan, D. J.; Gebran, M.; Houdebine, E. R. +1 more
The reliable determination of rotation-activity correlations (RACs) depends on precise measurements of the following stellar parameters: T eff, parallax, radius, metallicity, and rotational speed v sin I. In this paper, our goal is to focus on the determination of these parameters for a sample of K and M dwarfs. In a future paper (Paper…
Halo dust detection around NGC 891
Bianchi, S.; Hunt, L. K.; Schneider, R. +1 more
Context. Observations of edge-on galaxies allow us to investigate the vertical extent and properties of dust, gas and stellar distributions. NGC 891 has been studied for decades and represents one of the best studied cases of an edge-on galaxy.
Aims: We use deep Photoconductor Array Camera and Spectrometer (PACS) data together with Infrared A…
Properties of current sheet thinning at x ∼- 10 to -12 RE
Artemyev, A. V.; Runov, A.; Angelopoulos, V. +1 more
We report on Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations of current sheet thinning in Earth's magnetotail at around x =- 10 to -12 Earth radii. The THEMIS spacecraft configuration in October-December 2015 allows us to construct both gradients that contribute to the cross-tail current density jy=µ…
Late Time Multi-wavelength Observations of Swift J1644+5734: A Luminous Optical/IR Bump and Quiescent X-Ray Emission
Cenko, S. B.; Lyman, J. D.; Bloom, J. S. +10 more
We present late time multi-wavelength observations of Swift J1644+57, suggested to be a relativistic tidal disruption flare (TDF). Our observations extend to >4 years from discovery and show that 1.4 years after outburst the relativistic jet switched off on a timescale less than tens of days, corresponding to a power-law decay faster than t
Sympathetic Solar Filament Eruptions
Wang, Rui; Yang, Zhongwei; Liu, Ying D. +3 more
The 2015 March 15 coronal mass ejection as one of the two that together drove the largest geomagnetic storm of solar cycle 24 so far was associated with sympathetic filament eruptions. We investigate the relations between the different filaments involved in the eruption. A surge-like small-scale filament motion is confirmed as the trigger that ini…