Search Publications
Three small transiting planets around the M-dwarf host star LP 358-499
Poppenhaeger, K.; Wells, R.; Watson, C. A.
We report on the detection of three transiting small planets around the low-mass star LP 358-499 (K2-133), using photometric data from the Kepler-K2 mission. Using multiband photometry, we determine the host star to be an early M dwarf with an age likely older than a gigayear. The three detected planets K2-133 b, c and d have orbital periods of ca…
The Effect of the Betatron Mechanism on the Dynamics of Superthermal Electron Fluxes within Dipolizations in the Magnetotail
Daly, P. W.; Malykhin, A. Yu.; Grigorenko, E. E. +1 more
The dynamics of high-energy electron fluxes (with energies over 40 keV) is analyzed in 13 events of magnetic field dipolization observed by the Cluster satellites in the near-tail of the Earth magnetosphere. In all of the events, the observed energetic electron fluxes are enhanced simultaneously with initial dipolization. Good correlation (correla…
K2 spots rotation in the helium star HD144941
Ramsay, Gavin; Jeffery, C. Simon
HD144941 is an evolved early-type metal-poor low-mass star with a hydrogen-poor surface. It is frequently associated with other intermediate helium-rich subdwarfs and extreme helium stars. Previous photometric studies have failed to detect any variability. New observations with the K2 mission show complex but periodic variations with a full amplit…
Near-infrared to Mid-infrared Observations of Galaxy Mergers: NGC 2782 and NGC 7727
Lebouteiller, Vianney; Onaka, Takashi; Sakon, Itsuki +5 more
We present the results of near-infrared-to-mid-infrared (NIR-to-MIR) imaging and NIR spectroscopic observations of two galaxy mergers, NGC 2782 (Arp 215) and NGC 7727 (Arp 222), with the Infrared Camera on board AKARI. NGC 2782 shows extended MIR emission in the eastern side of the galaxy, which corresponds to the eastern tidal tail seen in the H …
An on Orbit Determination of Point Spread Functions for the Interface Region Imaging Spectrograph
De Pontieu, Bart; Kankelborg, Charles; Wülser, Jean-Pierre +1 more
Using the 2016 Mercury transit of the Sun, we characterize on orbit spatial point spread functions (PSFs) for the Near- (NUV) and Far- (FUV) Ultra-Violet spectrograph channels of NASA's Interface Region Imaging Spectrograph (IRIS). A semi-blind Richardson-Lucy deconvolution method is used to estimate PSFs for each channel. Corresponding estimates …
A Hubble Space Telescope survey for novae in M87 - III. Are novae good standard candles 15 d after maximum brightness?
Welch, D. L.; Lauer, Tod R.; Mikołajewska, Joanna +13 more
Ten weeks of daily imaging of the giant elliptical galaxy M87 with the Hubble Space Telescope (HST) has yielded 41 nova light curves of unprecedented quality for extragalactic cataclysmic variables. We have recently used these light curves to demonstrate that the observational scatter in the so-called maximum-magnitude rate of decline (MMRD) relat…
ExoMars 2016 Schiaparelli Module Trajectory and Atmospheric Profiles Reconstruction. Analysis of the On-board Inertial and Radar Measurements
Debei, S.; Karatekin, O.; Colombatti, G. +5 more
On 19th October 2016 Schiaparelli module of the ExoMars 2016 mission flew through the Mars atmosphere. After successful entry and descent under parachute, the module failed the last part of the descent and crashed on the Mars surface. Nevertheless the data transmitted in real-time by Schiaparelli during the entry and descent, together w…
XMM-Newton study of the supersoft symbiotic system Draco C1
Sasaki, Manami; Saeedi, Sara; Ducci, Lorenzo
We present the results of the analysis of thirty-one XMM-Newton observations of the symbiotic star Draco C1 located in the Draco dwarf spheroidal galaxy. This object had been identified as a supersoft source based on ROSAT data. We analysed X-ray, ultraviolet (UV) and optical data taken with XMM-Newton in order to obtain the physical parameters an…
The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86 GHz
An, T.; Frey, S.; Yang, J. +10 more
Radio-loud active galactic nuclei (AGNs), hosting powerful relativistic jet outflows, provide an excellent laboratory for studying jet physics. Very long baseline interferometry (VLBI) enables high-resolution imaging on milli-arcsecond (mas) and sub-mas scales, making it a powerful tool to explore the inner jet structure, shedding light on the for…
Deprojected Trajectory of Blobs in the Inner Corona
Blanco-Cano, X.; Panasenco, O.; Stenborg, G. +1 more
We have carried out a statistical analysis of the kinematical behavior of small white-light transients (blobs) as tracers of the slow solar wind. The characterization of these faint white-light structures gives us insight on the origin and acceleration of the slow solar wind. The vantage observing points provided by the SECCHI and LASCO instrument…