Search Publications
Sparse Box-fitting Least Squares
Zucker, Shay; Panahi, Aviad
We present a new implementation of the commonly used Box-fitting Least Squares (BLS) algorithm, for the detection of transiting exoplanets in photometric data. Unlike BLS, our new implementation—Sparse BLS, does not use binning of the data into phase bins, nor does it use any kind of phase grid. Thus, its detection efficiency does not depend on th…
The magnetic field in the dense photodissociation region of DR 21
Menten, Karl M.; Jacob, Arshia M.; Pillai, Thushara G. S. +3 more
Measuring interstellar magnetic fields is extremely important for understanding their role in different evolutionary stages of interstellar clouds and star formation. However, detecting the weak field is observationally challenging. We present measurements of the Zeeman effect in the 1665 and 1667 MHz (18 cm) lines of the hydroxyl radical (OH) lin…
Using VIRTIS on Venus Express to Constrain the Properties of the Giant Dark Cloud Observed in Images of Venus by IR2 on Akatsuki
Tsang, Constantine C. C.; Barstow, Joanna K.; McGouldrick, Kevin +1 more
A cloud opacity contrast feature that has been called a "long-lived sharp disruption" has been seen in the atmosphere of Venus in the near-infrared using Akatsuki's IR2 camera, most clearly at equatorial latitudes. This feature was found to have a consistent planet-circling period of 4.9 days, and subsequent searches of past imagery revealed that …
Azimuthal propagation of star formation in nearby spiral galaxies: NGC 628, NGC 3726, and NGC 6946
Gusev, A. S.; Sakhibov, F.; Hemmerich, C.
Star formation induced by a spiral shock wave, which in turn is generated by a spiral density wave, produces an azimuthal age gradient across the spiral arm, which has opposite signs on either side of the corotational resonance. An analysis of the spatial separation between young star clusters and nearby H II regions has made it possible to determ…
Discovery of extremely low-metallicity circumgalactic gas at z = 0.5 towards Q0454-220
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +3 more
We have obtained new observations of the absorption system at zabs = 0.48 towards QSO Q0454-220, which we use to constrain its chemical and physical conditions. The system features metal-enriched gas and previously unknown low-metallicity gas detected ${\sim} 200 \, \mathrm{km \, s^{-1}}$ blueward of the metal-enriched gas. The low-meta…
A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT
Rahaman, Majidul; Raja, Ramij; Datta, Abhirup +3 more
The presence of non-thermal electrons and large-scale magnetic fields in the intracluster medium is known through the detection of megaparsec (Mpc) scale diffuse radio synchrotron emission. Although a significant amount of progress in finding new diffuse radio sources has happened in the last decade, most of the investigation has been constrained …
Optical reconstruction of dust in the region of supernova remnant RX J1713.7−3946 from astrometric data
Krone-Martins, A.; Rowell, G.; Fukui, Y. +5 more
The origin of the radiation observed in the region of the supernova remnant RX J1713.7−3946, one of the brightest TeV emitters, has been debated since its discovery. The existence of atomic and molecular clouds in this object supports the idea that part of the GeV gamma-ray emission in this region originates from proton-proton collisions. However,…
Cloud structures in M 17 SWex : Possible cloud-cloud collision
Sanhueza, Patricio; Kim, Kee-Tae; Nakamura, Fumitaka +11 more
Using wide-field 13CO (J = 1-0) data taken with the Nobeyama 45 m telescope, we investigate cloud structures of the infrared dark cloud complex in M 17 with Spectral Clustering for Interstellar Molecular Emission Segmentation. In total, we identified 118 clouds that include 11 large clouds with radii larger than 1 pc. The clouds are mai…
NGTS-13b: a hot 4.8 Jupiter-mass planet transiting a subgiant star
Jordán, Andrés; Wheatley, Peter J.; Bayliss, Daniel +31 more
We report the discovery of the massive hot Jupiter NGTS-13b by the Next Generation Transit Survey (NGTS). The V = 12.7 host star is likely in the subgiant evolutionary phase with logg* = 4.04 ± 0.05, Teff = 5819 ± 73 K, M* = 1.30−0.18+0.11 M⊙, and R* = 1.79 ± 0.06 R⊙…
The TOPGöt high-mass star-forming sample. I. Methyl cyanide emission as tracer of early phases of star formation
Immer, K.; Testi, L.; Elia, D. +9 more
Aims: The TOPGöt project studies a sample of 86 high-mass star-forming regions in different evolutionary stages from starless cores to ultra compact HII regions. The aim of the survey is to analyze different molecular species in a statistically significant sample to study the chemical evolution in high-mass star-forming regions, and identify …