Search Publications
Optical Night Sky Brightness Measurements from the Stratosphere
Jauzac, Mathilde; Sivanandam, Suresh; Tam, Sut-Ieng +27 more
This paper presents optical night sky brightness measurements from the stratosphere using CCD images taken with the Super-pressure Balloon-borne Imaging Telescope (SuperBIT). The data used for estimating the backgrounds were obtained during three commissioning flights in 2016, 2018, and 2019 at altitudes ranging from 28 to 34 km above sea level. F…
Broadband X-ray analysis of 1E 1740.7-2942: constraints on spin, inclination, and a tentative black hole mass
Castro, M.; Stecchini, Paulo E.; Braga, J. +2 more
1E 1740.7-2942 is one of the strongest hard X-ray emitters in the Galactic Centre region, believed to be a black hole in a high-mass X-ray binary system. Although extensively studied in X-rays, many aspects about the underlying nature of the system are still unknown. For example, X-ray data analyses of 1E 1740.7-2942 to date have not yet unveiled …
Correcting the effect of magnetic tongues on the tilt angle of bipolar active regions
López Fuentes, M. C.; Mandrini, C. H.; Démoulin, P. +2 more
Context. The magnetic polarities of bipolar active regions (ARs) exhibit elongations in line-of-sight magnetograms during their emergence. These elongations are referred to as magnetic tongues and attributed to the presence of twist in the emerging magnetic flux-ropes (FRs) that form ARs.
Aims: The presence of magnetic tongues affects the mea…
Probing the Physical Conditions and Star Formation Processes in the Galactic H II Region S305
Dewangan, L. K.; Ojha, D. K.; Pandey, Rakesh +5 more
We present multiscale and multiwavelength observations of the Galactic H II region S305, which is excited by massive O8.5V and O9.5V stars. Infrared images reveal an extended sphere-like shell (extension ∼7.5 pc; at Td = 17.5-27 K) enclosing the S305 H II region (size ∼5.5 pc; age ∼1.7 Myr). The extended structure observed in the Hersch…
Extended radio emission associated with a breakout eruption from the back side of the Sun
Palmerio, E.; Kilpua, E. K. J.; Lynch, B. J. +1 more
Context. Coronal mass ejections (CMEs) on the Sun are the largest explosions in the Solar System that can drive powerful plasma shocks. The eruptions, shocks, and other processes associated to CMEs are efficient particle accelerators and the accelerated electrons in particular can produce radio bursts through the plasma emission mechanism.
Ai…
The Velocity Dispersion Function for Quiescent Galaxies in Nine Strong-lensing Clusters
Diaferio, Antonaldo; Hwang, Ho Seong; Geller, Margaret J. +2 more
We measure the central stellar velocity dispersion function for quiescent galaxies in a set of nine northern clusters in the redshift range 0.18 < z < 0.29 and with strong lensing arcs in Hubble Space Telescope images. The velocity dispersion function links galaxies directly to their dark matter halos. From dense SDSS and MMT/Hectospec spect…
KIC 8975515: A fast-rotating (γ Dor - δ Sct) hybrid star with Rossby modes and a slower δ Sct companion in a long-period orbit
Jofré, P.; Lampens, P.; Samadi-Ghadim, A. +1 more
Aims: KIC 8975515 is a double-lined spectroscopic binary system with hybrid nature. Regular monitoring with the échelle spectrograph HERMES show that both components have matching atmospheric properties (Teff ∼ 7400 K), and that one of them is a fast rotator (v sin i = 162 versus 32 km s-1). Our aim is to study the Keple…
CHEOPS observations of TESS primary mission monotransits
Lendl, Monika; Pollacco, Don; Cooke, Benjamin F. +2 more
We set out to look at the overlap between CHaracterizing ExOPlanets Satellite (CHEOPS) sky coverage and Transiting Exoplanet Survey Satellite (TESS) primary mission monotransits to determine what fraction of TESS monotransits may be observed by CHEOPS. We carry out a simulation of TESS transits based on the stellar population in TICv8 in the prima…
Temporal and Spatial Scales in Coronal Rain Revealed by UV Imaging and Spectroscopic Observations
Toriumi, Shin; Antolin, Patrick; Katsukawa, Yukio +1 more
Coronal rain corresponds to cool and dense clumps in the corona accreting towards the solar surface; it is often observed above solar active regions. These clumps are generally thought to be produced by a thermal instability in the corona and their lifetime is limited by the time they take to reach the chromosphere. Although the rain usually fragm…
NGTS-12b: A sub-Saturn mass transiting exoplanet in a 7.53 day orbit
Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano +35 more
We report the discovery of the transiting exoplanet NGTS-12b by the Next Generation Transit Survey (NGTS). The host star, NGTS-12, is a V = 12.38 mag star with an effective temperature of Teff = 5690 ± 130 K. NGTS-12b orbits with a period of P = 7.53 d, making it the longest period planet discovered to date by the main NGTS survey. We v…