Search Publications
Flares confirmed for the first time to be from the primary component of an eclipsing binary
Li, Kai; Gao, Xing; Sun, Guo-You +3 more
Only a handful of precise observations of flare detected from a contact binary so far. This paper presents the photometric and spectroscopic analysis of a contact binary (ASAS J082243+1927.0). Two flare events detected from this object were observed in the data of TESS. The two flare events both occurred at the secondary minimum. Considering the t…
Detection of 12 426 SB2 candidates in the LAMOST-MRS, using a binary spectral model
Han, Zhanwen; Kovalev, Mikhail; Zhou, Zenghua +1 more
We use an updated method for the detection of double-lined spectroscopic binaries (SB2s) using Vsin i values from spectral fits. The method is applied to all spectra from Large sky Area Multi-Object fiber Spectroscopic Telescope Medium Resolution Survey. Using this method, we detect 12 426 SB2 candidates, where 4321 are already known and 8105 are …
Detection and preliminary characterization of polluted white dwarfs from Gaia EDR3 and LAMOST
Vanderburg, Andrew; Seager, Sara; Badenas-Agusti, Mariona +4 more
We present a catalogue of 62 polluted white dwarfs observed by the 9th Low-Resolution Data Release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST LRS DR9v1; R≈1800) and the Early Data Release 3 (EDR3) of the Gaia Mission. Among these stellar remnants, 30 are new discoveries with previously unknown traces of calcium pollut…
Weakly supervised anomaly detection in the Milky Way
Buckley, Matthew R.; Shih, David; Thanvantri, Sowmya +3 more
Large-scale astrophysics data sets present an opportunity for new machine learning techniques to identify regions of interest that might otherwise be overlooked by traditional searches. To this end, we demonstrate how Classification Without Labels (CWOLA), a weakly supervised anomaly detection method, can help identify cold stellar streams within …
The most variable VVV sources: eruptive protostars, dipping giants in the nuclear disc and others
Minniti, D.; Bayo, A.; Saito, R. K. +16 more
We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young stellar objects (YSOs) and detect unusual or new types of infrared variable source. We find 222 variable or transi…
Massive star formation in the hub-filament system of RCW 117
Ojha, D. K.; Vig, S.; Ghosh, S. K. +1 more
We present a multiwavelength investigation of the hub-filament system RCW 117 (IRAS 17059-4132), which shows intricate filamentary features in the far-infrared, mapped using Herschel images. We obtain the column density and dust temperature maps for the region using the Herschel images and identify 88 cores and 12 filaments from the column density…
Strongly magnetized accretion in two ultracompact binary systems
Zurek, David R.; Maccarone, Thomas J.; Kupfer, Thomas +5 more
We present the discoveries of two of AM CVn systems, Gaia14aae and SDSS J080449.49+161624.8, which show X-ray pulsations at their orbital periods, indicative of magnetically collimated accretion. Both also show indications of higher rates of mass transfer relative to the expectations from binary evolution driven purely by gravitational radiation, …
Clues to growth and disruption of two neighbouring spiral arms of the Milky Way
Matsunaga, Noriyuki; Kawata, Daisuke; Taniguchi, Daisuke +3 more
Studying the nature of spiral arms is essential for understanding the formation of the intricate disc structure of the Milky Way. The European Space Agency's Gaia mission has provided revolutionary observational data that have uncovered detailed kinematical features of stars in the Milky Way. However, so far the nature of spiral arms continues to …
Modelling the seasonal cycle of Uranus's colour and magnitude, and comparison with Neptune
Pérez-Hoyos, Santiago; Toledo, Daniel; Irwin, Patrick G J +9 more
We present a quantitative analysis of the seasonal record of Uranus's disc-averaged colour and photometric magnitude in Strömgren b and y filters (centred at 467 and 551 nm, respectively), recorded at the Lowell Observatory from 1950 to 2016, and supplemented with HST/WFC3 observations from 2016 to 2022. We find that the seasonal variations of mag…
XMM-Newton-discovered Fast X-ray Transients: host galaxies and limits on contemporaneous detections of optical counterparts
Stern, D.; Bauer, F. E.; Smartt, S. J. +18 more
Extragalactic fast X-ray transients (FXTs) are a class of soft (0.3-10 keV) X-ray transients lasting a few hundred seconds to several hours. Several progenitor mechanisms have been suggested to produce FXTs, including supernova shock breakouts, binary neutron star mergers, or tidal disruptions involving an intermediate-mass black hole and a white …