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16 papers
A new way to find symbiotic stars: accretion disc detection with continuum survey photometry
A. B. Lucy, J. L. Sokoloski, G. J. M. Luna +10
Symbiotic stars are binaries in which a cool and evolved star of luminosity class I-III accretes onto a smaller companion. However, direct accretion signatures like disc flickering…
NGTS-21b: An Inflated Super-Jupiter Orbiting a Metal-poor K dwarf
Douglas R. Alves, James S. Jenkins, Jose I. Vines +29
We report the discovery of NGTS-21b, a massive hot Jupiter orbiting a low-mass star as part of the Next Generation Transit Survey (NGTS). The planet has a mass and radius of $2.36…
Optical Studies of Ten Hard X-ray Selected Cataclysmic Binaries
J. P. Halpern, J. R. Thorstensen
We conducted time-resolved optical spectroscopy and/or photometry of ten cataclysmic binaries that were discovered in hard X-ray surveys, with the goal of measuring their orbital p…
NGTS-19b : A high mass transiting brown dwarf in a 17-day eccentric orbit
Jack S. Acton, Michael R. Goad, Matthew R. Burleigh +34
We present the discovery of NGTS-19b, a high mass transiting brown dwarf discovered by the Next Generation Transit Survey (NGTS). We investigate the system using follow up photomet…
NGTS 15b, 16b, 17b and 18b: four hot Jupiters from the Next Generation Transit Survey
Rosanna H. Tilbrook, Matthew R. Burleigh, Jean C. Costes +36
We report the discovery of four new hot Jupiters with the Next Generation Transit Survey (NGTS). NGTS-15b, NGTS-16b, NGTS-17b, and NGTS-18b are short-period (d) planets orbiti…
Two Long-Period Cataclysmic Variable Stars: ASASSN-14ho and V1062 Cyg
L. Claire Gasque, Callum A. Hening, Raphael E. Hviding +5
We report spectroscopy and photometry of the cataclysmic variable stars ASASSN-14ho and V1062 Cyg. Both are dwarf novae with spectra dominated by their secondary stars, which we cl…
Fast quasi-periodic oscillations in the eclipsing polar VV Puppis from VLT and XMM-Newton observations
J. M. Bonnet-Bidaud, M. Mouchet, E. Falize +7
We present high time resolution optical photometric data of the polar VV Puppis obtained simultaneously in three filters (u', HeII 4686, r') with the ULTRACAM camera mounted at…
High-speed photometry of faint cataclysmic variables - IX. Targets from multiple transient surveys
K. Paterson, P. A. Woudt, B. Warner +5
We present high-speed photometric observations of 25 cataclysmic variables detected by the All Sky Automated Search for Super-Novae (ASAS-SN), the Mobile Astronomical System of the…
Discovery, observations and modelling of a new eclipsing polar: MASTER OT J061451.70-272535.5
H. Breytenbach, D. A. H. Buckley, P. Hakala +9
We report the discovery of a new eclipsing polar, MASTER OT J061451.70-272535.5, detected as an optical transient by MASTER auto-detection software at the recently commissioned MAS…
High-speed photometry of the eclipsing polar UZ Fornacis
Z. N. Khangale, S. B. Potter, E. J. Kotze +2
We present 33 new mid-eclipse times spanning approximately eight years of the eclipsing polar UZ Fornacis. We have used our new observations to test the two-planet model previously…
Optical Studies of 15 Hard X-ray Selected Cataclysmic Binaries
J. P. Halpern, J. R. Thorstensen, P. Cho +5
We conducted time-resolved optical spectroscopy and/or time-series photometry of 15 cataclysmic binaries that were discovered in hard X-ray surveys by the Swift Burst Alert Telesco…
The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
The Astropy Collaboration, A. M. Price-Whelan, B. M. Sipőcz +134
The Astropy project supports and fosters the development of open-source and openly-developed Python packages that provide commonly-needed functionality to the astronomical communit…
IGR J19552+0044: A new asynchronous short period polar: "Filling the gap between intermediate and ordinary polars"
G. Tovmassian, D. Gonzalez-Buitrago, J. Thorstensen +23
Based on XMM--Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. We conducted follow-up optical observations to identify the sourc…
Size and shape of Chariklo from multi-epoch stellar occultations
R Leiva, B Sicardy, J I B Camargo +28
We use data from five stellar occultations observed between 2013 and 2016 to constrain Chariklo's size and shape, and the ring reflectivity. We consider four possible models for Ch…
The structure of Chariklo's rings from stellar occultations
D. Bérard, B. Sicardy, J. I. B. Camargo +79
Two narrow and dense rings (called C1R and C2R) were discovered around the Centaur object (10199) Chariklo during a stellar occultation observed on 2013 June 3. Following this disc…
On the area of accretion curtains from fast aperiodic time variability of the intermediate polar EX Hya
Andrey N. Semena, Mikhail G. Revnivtsev, David A. H. Buckley +6
We present results of a study of the fast timing variability of the magnetic cataclysmic variable (mCV) EX Hya. It was previously shown that one may expect the rapid flux variabili…