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The effect of phased recurrent units in the classification of multiple catalogues of astronomical light curves
Cabrera-Vives, G.; Protopapas, P.; Carrasco-Davis, R. +2 more
In the new era of very large telescopes, where data are crucial to expand scientific knowledge, we have witnessed many deep learning applications for the automatic classification of light curves. Recurrent neural networks (RNNs) are one of the models used for these applications, and the Long Short-Term Memory (LSTM) unit stands out for being an ex…
Study of the Inner Structure of the Molecular Torus in IRAS 08572+3915 NW with Velocity Decomposition of CO Rovibrational Absorption Lines
Onishi, Shusuke; Nakagawa, Takao; Baba, Shunsuke +6 more
Understanding the inner structure of the clumpy molecular torus surrounding the active galactic nucleus is essential in revealing the forming mechanism. However, spatially resolving the torus is difficult because of its size of a few parsecs. Thus, to probe the clump conditions in the torus, we performed the velocity decomposition of the CO rovibr…
Neglected X-ray discovered polars. III. RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925
Burwitz, V.; Beuermann, K.; Schwope, A. +2 more
We report results on the ROSAT-discovered noneclipsing short-period polars RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925 collected over 30 years. We present accurate linear orbital ephemerides that allow a correct phasing of data taken decades apart. Three of the systems show cyclotron and Zeeman lines tha…
Interferometric Imaging of λ Andromedae: Evidence of Starspots and Rotation
White, R. J.; Baron, F.; Parks, J. R. +14 more
Presented are the first interferometric images of cool starspots on the chromospherically active giant λ Andromedae. Using the Michigan Infra-Red Combiner coupled to the Center for High Angular Resolution Astronomy Array, 26 interferometric observations were made between 2008 August 17 and 2011 September 24. The photometric time series acquired at…
On the Nature of Propagating Intensity Disturbances in Polar Plumes during the 2017 Total Solar Eclipse
Madjarska, Maria S.; Lim, Eun-Kyung; Yang, Heesu +8 more
The propagating intensity disturbances (PIDs) in plumes are still poorly understood, and their identity (magnetoacoustic waves or flows) remains an open question. We investigate PIDs in five plumes located in the northern polar coronal hole observed during the 2017 total solar eclipse. Three plumes are associated with coronal bright points, jets, …
Discovery of a Wind-blown Bubble Associated with the Supernova Remnant G346.6-0.2: A Hint for the Origin of Recombining Plasma
Filipović, M. D.; Suzuki, H.; Fukui, Y. +3 more
We report on CO and H I studies of the mixed-morphology supernova remnant (SNR) G346.6-0.2. We find a wind-blown bubble along the radio continuum shell with an expansion velocity of ~10 km s-1, which was likely formed by strong stellar winds from the high-mass progenitor of the SNR. The radial velocities of the CO/H I bubbles at V …
Detection of a high-temperature blackbody hump in black hole spectra - the strongly redshifted annihilation line
Titarchuk, Lev; Seifina, Elena
We detected a so-called high-temperature blackbody (HBB) component, found in the 15-40 keV range, in the broad-band X-ray energy spectra of black hole (BH) candidate sources. A detailed study of this spectral feature is presented using data from five of the Galactic BH binaries, Cyg X-1, GX 339-4, GRS 1915+105, SS 433, and V4641 Sgr in the low/har…
Sr and Ba abundances: Comparing machine-learning with star-by-star analyses. High-resolution re-analysis of suspected LAMOST barium stars
Jorissen, A.; Escorza, A.; Van Winckel, H. +6 more
Context. A new large sample of 895 s-process-rich candidates out of 454 180 giant stars surveyed by LAMOST at a low spectral resolution (R ~ 1800) has been reported by Norfolk et al. (2019, MNRAS, 490, 2219; hereafter N19).
Aims: This study is aimed at confirming the s-process enrichment at the higher resolution (R ~ 86 000) offered by the HE…
Evidence for stellar contamination in the transmission spectra of HAT-P-12b
Pallé, E.; Yan, F.; Chen, G. +4 more
Context. Transmission spectroscopy characterizes the wavelength dependence of transit depth, revealing atmospheric absorption features in planetary terminator regions. In this context, different optical transmission spectra of HAT-P-12b reported in previous studies exhibited discrepant atmospheric features (e.g., Rayleigh scattering and alkali abs…
Bayesian Cross-matching of High Proper-motion Stars in Gaia DR2 and Photometric Metallicities for 1.7 million K and M Dwarfs
Lépine, Sébastien; Medan, Ilija; Hartman, Zachary
We present a Bayesian method to cross-match 5,827,988 high proper-motion Gaia sources ( > 40 mas yr1) to various photometric surveys: Two Micron All Sky Survey, AllWISE data release from the Wide-field Infrared Explorer (WISE) mission, Galaxy Evolution Explorer, Radial Velocity Experiment, Sloan Digital Sky Survey, and Panoramic Surv…