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Solar jet-like features rooted in flare ribbons
Hou, Yijun; Yang, Shuhong; Zhang, Jun +1 more
Employing the high spatio-temporal Interface Region Imaging Spectrograph 1330 Å observations, we investigated the jet-like features that occurred during the X8.2 class flare in NOAA active region (AR) 12673 on 2017 September 10. These jet-like features were rooted in the flare ribbons. We examined 15 features, and the mean values of the lifetimes,…
Estimation of singly transiting K2 planet periods with Gaia parallaxes
Jordán, Andrés; Espinoza, Néstor; Brahm, Rafael +1 more
When a planet is only observed to transit once, direct measurement of its period is impossible. It is possible, however, to constrain the periods of single transiters, and this is desirable as they are likely to represent the cold and far extremes of the planet population observed by any particular survey. Improving the accuracy with which the per…
Imaging Observations of Chromospheric Evaporation in a Circular-ribbon Flare
Huang, Y.; Li, D.; Zhang, Q. M.
In this paper, we report our multiwavelength imaging observations of chromospheric evaporation in a C5.5 circular-ribbon flare (CRF) on 2014 August 24. The flare was observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, the X-ray Telescope (XRT) on board the Hinode spacecraft, and the ground-based Nobeyama Rad…
BRITE photometry of the massive post-RLOF system HD149 404
Gosset, E.; Handler, G.; Wade, G. A. +12 more
Context. HD 149 404 is an evolved non-eclipsing O-star binary that has previously undergone a Roche lobe overflow interaction.
Aims: Understanding some key properties of the system requires a determination of the orbital inclination and of the dimensions of the components.
Methods: The BRITE-Heweliusz satellite was used to collect photom…
The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
Neumayer, Nadine; Georgiev, Iskren Y.; Baumgardt, Holger +11 more
We analyse high spatial resolution near infrared (NIR) imaging of NGC 6384, a Milky Way like galaxy, using ARGOS commissioning data at the Large Binocular Telescope (LBT). ARGOS provides a stable PSFFWHM = 0{^''.}2-0{^''.}3 AO correction of the ground layer across the LUCI 2 NIR camera 4 × 4 arcmin field by using s…
The Kepler Smear Campaign: Light Curves for 102 Very Bright Stars
Davies, Guy R.; Bieryla, Allyson; Latham, David W. +19 more
We present the first data release of the Kepler Smear Campaign, using collateral “smear” data obtained in the Kepler four-year mission to reconstruct light curves of 102 stars too bright to have been otherwise targeted. We describe the pipeline developed to extract and calibrate these light curves and show that we attain photometric precision comp…
Large angular scale fluctuations of near-infrared extragalactic background light based on the IRTS observations
Jeong, Woong-Seob; Lee, Hyung Mok; Tanaka, Masahiro +4 more
We measure the spatial fluctuations of the Near-Infrared Extragalactic Background Light (NIREBL) from 2° to 20° in angular scale at the 1.6 and 2.2 µ m using data obtained with Near-Infrared Spectrometer (NIRS) on board the Infrared Telescope in Space (IRTS). The brightness of the NIREBL is estimated by subtracting foreground components such…
Colors of Trans-Neptunian Contact Binaries
Thirouin, Audrey; Sheppard, Scott S.
The g‧r‧i‧ colors of seven likely and potential contact binaries in the Kuiper Belt were acquired with the Magellan-Baade telescope and combined with colors from the literature to understand contact binary surfaces. The likely and potential contact binaries discovered in the dynamically cold classical population display very red/ultra-red colors. …
On Doppler Shift and Its Center-to-limb Variation in Active Regions in the Transition Region
Tripathi, Durgesh; Ghosh, Avyarthana; Klimchuk, James A.
A comprehensive understanding of the structure of Doppler motions in the transition region including the center-to-limb variation and its relationship with the magnetic field structure is vital for the understanding of mass and energy transfer in the solar atmosphere. In this paper, we have performed such a study in an active region using the Si I…
Chandra and Hubble Space Telescope observations of dark gamma-ray bursts and their host galaxies
Lyman, J. D.; Fruchter, A. S.; Perley, D. A. +8 more
We present a study of 21 dark gamma-ray burst (GRB) host galaxies, predominantly using X-ray afterglows obtained with the Chandra X-Ray Observatory (CXO) to precisely locate the burst in deep Hubble Space Telescope (HST) imaging of the burst region. The host galaxies are well-detected in F160W in all but one case and in F606W imaging in 60 per cen…