Search Publications
Ground-based detection of G star superflares with NGTS
Jackman, James A. G.; Wheatley, Peter J.; Günther, Maximilian N. +19 more
We present high cadence detections of two superflares from a bright G8 star (V = 11.56) with the Next Generation Transit Survey (NGTS). We improve upon previous superflare detections by resolving the flare rise and peak, allowing us to fit a solar flare inspired model without the need for arbitrary break points between rise and decay. Our data als…
Exploring cosmic origins with CORE: Effects of observer peculiar motion
Boulanger, F.; Ashdown, M.; Banday, A. J. +117 more
We discuss the effects on the cosmic microwave background (CMB), cosmic infrared background (CIB), and thermal Sunyaev-Zeldovich effect due to the peculiar motion of an observer with respect to the CMB rest frame, which induces boosting effects. After a brief review of the current observational and theoretical status, we investigate the scientific…
HERschel Observations of Edge-on Spirals (HEROES). IV. Dust energy balance problem
Holwerda, Benne W.; Clark, Christopher J. R.; Mosenkov, Aleksandr V. +15 more
We present results of the detailed dust energy balance study for the seven large edge-on galaxies in the HEROES sample using three-dimensional (3D) radiative transfer (RT) modelling. Based on available optical and near-infrared (NIR) observations of the HEROES galaxies, we derive the 3D distribution of stars and dust in these galaxies. For the sak…
Spectral and Imaging Observations of a Current Sheet Region in a Small-scale Magnetic Reconnection Event
Xue, Zhike; Yan, Xiaoli; Wang, Jincheng +5 more
We report a possible current sheet region associated with a small-scale magnetic reconnection event by using the spectral and imaging observations of the Interface Region Imaging Spectrograph (IRIS) and the magnetograms obtained by the Solar Dynamics Observatory on 2016 August 08. The length and width of the current sheet region are estimated to b…
The Rotational Evolution of Young, Binary M Dwarfs
Pinsonneault, Marc; Cody, Ann Marie; Hillenbrand, Lynne A. +5 more
We have analyzed K2 light curves for more than 3000 low-mass stars in the ∼8 Myr old Upper Sco association, the ∼125 Myr age Pleiades open cluster, and the ∼700 Myr old Hyades and Praesepe open clusters to determine stellar rotation rates. Many of these K2 targets show two distinct periods, and for the lowest-mass stars in these clusters, virtuall…
A revised shape model of asteroid (216) Kleopatra
Nolan, Michael C.; Springmann, Alessondra; Scheeres, Daniel J. +8 more
We used three different sets of Arecibo delay-Doppler radar images and five well-covered occultations to generate a revised three-dimensional shape model of asteroid (216) Kleopatra with a spatial resolution of ∼10 km. We find Kleopatra to be a bi-lobate contact binary of overall dimensions 276 × 94 × 78 km ± 15% and equivalent diameter Deq
SDSS J211852.96-073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy
Komossa, S.; Yang, Hui; Jin, Chichuan +6 more
We report on the identification of a new γ-ray-emitting narrow-line Seyfert 1 (NLS1) galaxy, SDSS J211852.96-073227.5 (hereinafter J2118-0732). The galaxy, at a redshift of 0.26, is associated with a radio source of flat/inverted spectrum at high radio frequencies. The analysis of its optical spectrum obtained in the Sloan Digital Sky Survey (SDSS…
Galactic outflows, star formation histories, and time-scales in starburst dwarf galaxies from STARBIRDS
McQuinn, Kristen B. W.; Skillman, Evan D.; Kelley, Tyler +2 more
Winds are predicted to be ubiquitous in low-mass, actively star-forming galaxies. Observationally, winds have been detected in relatively few local dwarf galaxies, with even fewer constraints placed on their time-scales. Here, we compare galactic outflows traced by diffuse, soft X-ray emission from Chandra Space Telescope archival observations to …
Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps
Ward-Thompson, Derek; Fuller, Gary; Kim, Kee-Tae +26 more
Context. Analysis of all-sky Planck submillimetre observations and the IRAS 100 µm data has led to the detection of a population of Galactic cold clumps. The clumps can be used to study star formation and dust properties in a wide range of Galactic environments.
Aims: Our aim is to measure dust spectral energy distribution (SED) variati…
Stellar ages and masses in the solar neighbourhood: Bayesian analysis using spectroscopy and Gaia DR1 parallaxes
Ting, Yuan-Sen; Dotter, Aaron; Lin, Jane +1 more
We present a Bayesian implementation of isochrone fitting in deriving stellar ages and masses, incorporating absolute K magnitude (M_K) derived from 2MASS photometry and Gaia DR1 parallax and differentiation between initial bulk metallicity and present-day surface metallicity, with allowance for incorporating further constraints (e.g. asteroseismo…