Search Publications
Temporal variation of the 3-micron hydrocarbon emissions at the 8-micron north polar hot spot of Jupiter: Comparison with solar wind activity
Kim, Sang Joon; Yung, Yuk L.; Miller, Steve +5 more
We have obtained Gemini/GNIRS 3.3-3.4 µm spectra of Jupiter at 65o North latitude over a range of longitudes roughly centered on the 8-µm CH4 north polar hot spot (8CNPHS). The spectra were measured on four occasions during a four-month period in 2018, in order to search for variability of the 3-µm emissions…
Observability of ultraviolet NI lines in the atmosphere of transiting Earth-like planets
France, Kevin; Cubillos, Patricio E.; Fossati, Luca +5 more
Nitrogen is a biosignature gas that cannot be maintained in its Earth-like ratio with CO2 under abiotic conditions. It has also been proven to be notoriously hard to detect at optical and infrared wavelengths. Fortunately, the ultraviolet region, which has only recently started being explored for terrestrial exoplanets, may provide new …
Enhancing coronal structures with radial local multi-scale filter
Ji, Kaifan; Bai, Xianyong; Liu, Hui +2 more
Images of the corona contain information over a wide range of spatial scales and various structures such as coronal holes, coronal loops, coronal mass ejections (CMEs), and helmet streamers with differences in brightness. Therefore, processing these images is important for determining various types of information. However, it is very difficult to …
Improving homology modeling from low-sequence identity templates in Rosetta: A case study in GPCRs
Bender, Brian Joseph; Marlow, Brennica; Meiler, Jens
CCD Photometry, Light Curve Modeling, and Period Study of the Overcontact Binary Systems NSVS 7245866 and V685 Pegasi
Alton, K. B.
Precise time-series multi-color (B, V, and Ic) light curve data were acquired at UnderOak Observatory (UO) from NSVS 7245866 (2017) and V685 Peg (2016). Prior to this investigation only monochromatic CCD data for both variables were available from automated surveys which employ sparse sampling strategies. Each target produced new times-of-minimum …
Spectroscopic observations of the machine-learning selected anomaly catalogue from the AllWISE Sky Survey
Gromadzki, M.; Thomas, R.; Sani, E. +7 more
We present the results of a programme to search and identify the nature of unusual sources within the All-sky Wide-field Infrared Survey Explorer (WISE) that is based on a machine-learning algorithm for anomaly detection, namely one-class support vector machines (OCSVM). Designed to detect sources deviating from a training set composed of known cl…
Vertical distribution of HMXBs in NGC 55: constraining their centre-of-mass velocity
Zezas, Andreas; Williams, Stephen J.; Andrews, Jeff J. +1 more
We analyse the vertical distribution of high-mass X-ray binaries (HMXBs) in NGC 55, the nearest edge-on galaxy to the Milky Way (MW), based on X-ray observations by Chandra. Adopting a statistical approach, we estimate the difference between the scale height of the vertical distribution of HMXBs and the vertical distribution of star-forming activi…
Feasibility of Observing Gamma-Ray Polarization from Cygnus X-1 Using a CubeSat
Chang, Hsiang-Kuang; Laurent, Philippe; Rodriguez, Jerome +7 more
Instruments flown on CubeSats are small. Meaningful applications of CubeSats in astronomical observations rely on the choice of a particular subject that is feasible for CubeSats. Here we report the result of a feasibility study for observing gamma-ray polarization from Cygnus X-1 using a small Compton polarimeter on board a 3U CubeSat. Silicon de…
Two-epoch Orbit Estimation for Wide Binaries Resolved in Hipparcos and Gaia
Makarov, Valeri V.
The Hipparcos catalog and its Double and Multiple System Annex (DMSA) lists 4099 components with individual proper motions and coordinates on the epoch 1991.25. Many of these long-period binary stars are also present in Gaia Data Release 2 (DR2). Using the available relative positions and proper motions separated by 24.25 yr, the equations of rela…
A study on the dynamic spectral indices for SEP events on 2000 July 14 and 2005 January 20
Le, Gui-Ming; Zhao, Ming-Xian
We have studied the dynamic proton spectra for the two solar energetic particle (SEP) events on 2000 July 14 (hereafter GLE59) and 2005 January 20 (hereafter GLE69). The source locations of GLE59 and GLE69 are N22W07 and N12W58 respectively. Proton fluxes >30 MeV have been used to compute the dynamic spectral indices of the two SEP events. Our …