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A Hubble Space Telescope Search for a Sub-Earth-sized Exoplanet in the GJ 436 System
Stevenson, Kevin B.; Kreidberg, Laura; Bean, Jacob L. +1 more
The detection of small planets orbiting nearby stars is an important step toward the identification of Earth twins. In previous work using the Spitzer Space Telescope, we found evidence to support at least one sub-Earth-sized exoplanet orbiting the nearby mid-M dwarf star GJ 436. As a follow up, here we used the Hubble Space Telescope (HST) to inv…
Hydrogen Fluoride toward Luminous Nearby Galaxies: NGC 253 and NGC 4945
Falgarone, E.; Lis, D. C.; Phillips, T. G. +4 more
We present the detection of hydrogen fluoride (HF) in two luminous nearby galaxies, NGC 253 and NGC 4945 using the Heterodyne Instrument for the Far-Infrared on board the Herschel Space Observatory. The HF line toward NGC 253 has a P-Cygni profile, while an asymmetric absorption profile is seen toward NGC 4945. The P-Cygni profile in NGC 253 sugge…
Evidence for two modes of black hole accretion in massive galaxies at z∼2
Ferguson, H. C.; Salvato, M.; Nandra, K. +18 more
We investigate the relationship between active galactic nucleus (AGN) activity and host galaxy properties using a sample of massive galaxies at z ∼ 2 in the Chandra Deep Field-South (CDFS). A sample of 268 galaxies with M* > 1010.5 M⊙ at 1.4 < z < 3 are selected from Hubble Space Telescope wide field camer…
The changing X-ray time lag in MCG-6-30-15
Fabian, A. C.; Miniutti, G.; Matt, G. +6 more
MCG-6-30-15 is one of the most observed narrow-line Seyfert 1 galaxies in the X-ray band. In this paper, we examine the X-ray time lags in this source using a total of 600 ks in observations (440 ks exposure) taken with the XMM-Newton telescope (300 ks in 2001 and 300 ks in 2013). Both the old and new observations show the usual hard lag that incr…
Collecting cometary dust particles on metal blacks with the COSIMA instrument onboard ROSETTA
Krüger, Harald; Langevin, Yves; Fischer, Henning +8 more
After a brief review of the instrument development and materials selection for collecting cometary dust in the vicinity of comet 67/P Churyumov-Gerasimenko we focus on laboratory verification for the capability of metal black targets to decelerate and capture dust particles (velocities in the order of 100 m/s; sizes of some 10 µm). The resul…
ECLAT Cluster Spacecraft Magnetotail Plasma Region Identifications (2001-2009)
Nakamura, R.; Volwerk, M.; Milan, S. E. +1 more
The European Space Agency's four-spacecraft Cluster mission has been observing the Earth's dynamical magnetotail region since early 2001. The magnetotail, and in particular the hot trapped plasma sheet, is a critical region in the coupled Sun-Earth system. Changes in the solar wind have direct influence on the properties and dynamical processes oc…
Evidence of strong energetic ion acceleration in the near-Earth magnetotail
Fränz, M.; Wei, Y.; Daly, P. W. +6 more
Until now it is still questionable whether ions are accelerated to energies above 100 keV in the near-Earth current sheet (CS), in the vicinity of a possible near-Earth neutral line. By using 11 years of 3-D energetic ion flux data for protons, helium, and oxygen (~150 keV-1 MeV) from the RAPID instrument on board Cluster 4, we statistically study…
The nature of supernovae 2010O and 2010P in Arp 299 - I. Near-infrared and optical evolution
Kankare, E.; Herrero-Illana, R.; Alberdi, A. +10 more
We present near-infrared and optical photometry, plus optical spectroscopy of two stripped-envelope supernovae (SNe) 2010O and 2010P that exploded in two different components of an interacting luminous infrared galaxy Arp 299 within only a few days of one another. SN 2010O is found to be photometrically and spectroscopically similar to many normal…
Tracking the Evolution of Quasi-periodic Oscillation in RE J1034+396 Using the Hilbert-Huang Transform
Hu, Chin-Ping; Chou, Yi; Yang, Ting-Chang +1 more
RE J1034+396, a narrow-line Seyfert 1 active galactic nucleus (AGN), is the first example of AGNs that exhibited a nearly coherent quasi-periodic oscillation (QPO) for the data collected by XMM-Newton in 2007. The spectral behaviors and timing properties of the QPO have been studied since its discovery. We present an analysis of the QPO in RE J103…
Transit Time of Coronal Mass Ejections under Different Ambient Solar Wind Conditions
Shanmugaraju, A.; Vršnak, Bojan
The speed [v(R)] of coronal mass ejections (CMEs) at various distances from the Sun is modeled (as proposed by Vršnak and Gopalswamy in J. Geophys. Res. 107, 2002, doi:10.1029/2001/JA000120) by using the equation of motion adrag=γ(v−w) and its quadratic form adrag=γ(v−w)|v−w|, where v and w are the speeds of the CME and solar…