Search Publications
NGTS-2b: an inflated hot-Jupiter transiting a bright F-dwarf
Smalley, Barry; Wheatley, Peter J.; Bayliss, Daniel +42 more
We report the discovery of NGTS-2b, an inflated hot-Jupiter transiting a bright F5V star (2MASS J14202949 - 3112074; Teff = 6478^{+94}_{-89} K), discovered as part of the Next Generation Transit Survey (NGTS). The planet is in a P = 4.51 d orbit with mass 0.74^{+0.13}_{-0.12}MJ, radius 1.595^{+0.047}_{-0.045}RJ, an…
Sequential Eruptions Triggered by Flux Emergence: Observations and Modeling
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +5 more
We describe and analyze observations by the Solar Dynamics Observatory of the emergence of a small, bipolar active region within an area of unipolar magnetic flux that was surrounded by a circular, quiescent filament. Within only 8 hours from the start of the emergence, a partial splitting of the filament and two consecutive coronal mass ejections…
A refined search for pulsations in white dwarf companions to millisecond pulsars
Hermes, J. J.; Althaus, Leandro G.; Gianninas, A. +7 more
We present optical high-speed photometry of three millisecond pulsars with low-mass (<0.3 M⊙) white dwarf companions, bringing the total number of such systems with follow-up time-series photometry to five. We confirm the detection of pulsations in one system, the white dwarf companion to PSR J1738+0333, and show that the pulsation f…
ALMA Observations of the Solar Chromosphere on the Polar Limb
Shimojo, Masumi; Okamoto, Takenori J.; Yokoyama, Takaaki +1 more
We report the results of the Atacama Large Millimeter/sub-millimeter Array (ALMA) observations of the solar chromosphere on the southern polar limb. Coordinated observations with the Interface Region Imaging Spectrograph (IRIS) are also conducted. ALMA provided unprecedented high spatial resolution in the millimeter band (≈2.″0) at 100 GHz frequen…
Dense Molecular Gas in the Starburst Nucleus of NGC 1808
Salak, Dragan; Tomiyasu, Yuto; Nakai, Naomasa +3 more
Dense molecular gas tracers in the central 1 kpc region of the superwind galaxy NGC 1808 have been imaged by ALMA at a resolution of 1″ (∼50 pc). Integrated intensities and line intensity ratios of HCN (1-0), H13CN (1-0), HCO+ (1-0), H13CO+ (1-0), HOC+ (1-0), HCO+ (4-3), CS (2-1), C…
An imaging spectroscopic survey of the planetary nebula NGC 7009 with MUSE★
Walsh, J. R.; Barlow, M. J.; Monreal-Ibero, A. +6 more
Aims: The spatial structure of the emission lines and continuum over the 50″ extent of the nearby, O-rich, PN NGC 7009 (Saturn Nebula) have been observed with the MUSE integral field spectrograph on the ESO Very Large Telescope. This study concentrates on maps of line emission and their interpretation in terms of physical conditions.
Met…
The velocity ellipsoid in the Galactic disc using Gaia DR1
Majewski, Steven R.; Anguiano, Borja; Freeman, Kenneth C. +2 more
The stellar velocity ellipsoid of the solar neighbour (d < 200 pc) is re-examined using intermediate-old mono-abundance stellar groups with high-quality chemistry data together with parallaxes and proper motions from Gaia DR1. We find the average velocity dispersion values for the three space velocity components for the thin and thick discs of …
Ionospheric Irregularities at Mars Probed by MARSIS Topside Sounding
Gurnett, D. A.; Halekas, J. S.; Kopf, A. J. +2 more
The upper ionosphere of Mars contains a variety of perturbations driven by solar wind forcing from above and upward propagating atmospheric waves from below. Here we explore the global distribution and variability of ionospheric irregularities around the exobase at Mars by analyzing topside sounding data from the Mars Advanced Radar for Subsurface…
Wide-field Optical Spectroscopy of Abell 133: A Search for Filaments Reported in X-Ray Observations
Kelson, Daniel D.; Patel, Shannon G.; Connor, Thomas +7 more
Filaments of the cosmic web have long been associated with the threadlike structures seen in galaxy redshift surveys. However, despite their baryon content being dominated by hot gas, these filaments have been an elusive target for X-ray observations. Recently, detections of filaments in very deep (2.4 Ms) observations with Chandra were reported a…
The First Continuous Optical Monitoring of the Transitional Millisecond Pulsar PSR J1023+0038 with Kepler
D'Avanzo, P.; Campana, S.; Stella, L. +10 more
We report on the first continuous, 80-day optical monitoring of the transitional millisecond pulsar PSR J1023+0038 carried out in mid 2017 with Kepler in the K2 configuration, when an X-ray subluminous accretion disk was present in the binary. Flares lasting from minutes to 14 hr were observed for 15.6% of the time, which is a larger fraction than…