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Superflares on the late-type giant KIC 2852961. Scaling effect behind flaring at different energy levels
Kriskovics, L.; Günther, M. N.; Bhatti, W. +7 more
Context. The most powerful superflares reaching 1039 erg bolometric energy are from giant stars. The mechanism behind flaring is thought to be the magnetic reconnection, which is closely related to magnetic activity (including starspots). However, it is poorly understood how the underlying magnetic dynamo works and how the flare activit…
The possible disappearance of a massive star in the low-metallicity galaxy PHL 293B
Smith, Nathan; Mehner, Andrea; Groh, Jose H. +4 more
We investigate a suspected very massive star in one of the most metal-poor dwarf galaxies, PHL 293B. Excitingly, we find the sudden disappearance of the stellar signatures from our 2019 spectra, in particular the broad H lines with P Cygni profiles that have been associated with a massive luminous blue variable (LBV) star. Such features are absent…
LRG-BEASTS: ground-based detection of sodium and a steep optical slope in the atmosphere of the highly inflated hot-saturn WASP-21b
Kirk, J.; Louden, T.; Wheatley, P. J. +7 more
We present the optical transmission spectrum of the highly inflated Saturn-mass exoplanet WASP-21b, using three transits obtained with the ACAM instrument on the William Herschel Telescope through the LRG-BEASTS survey (Low Resolution Ground-Based Exoplanet Atmosphere Survey using Transmission Spectroscopy). Our transmission spectrum covers a wave…
Bayesian Approach for Determining Microlens System Properties with High-angular-resolution Follow-up Imaging
Bennett, David P.; Koshimoto, Naoki; Suzuki, Daisuke
We present the details of the Bayesian analysis of the planetary microlensing event MOA-2016-BLG-227, whose excess flux is likely due to a source/lens companion or an unrelated ambient star, as well as of the assumed prior distributions. Furthermore, we apply this method to four reported planetary events, MOA-2008-BLG-310, MOA-2011-BLG-293, OGLE-2…
Detection of the phase curve and occultation of WASP-100b with TESS
Kipping, David; Jansen, Tiffany
We report the detection of the full orbital phase curve and occultation of the hot-Jupiter WASP-100b using TESS photometry. The phase curve is isolated by suppressing low-frequency stellar and instrumental modes using both a non-parametric harmonic notch filter (phasma) and semi-sector long polynomials. This yields a phase-curve signal of (73 ± 9)…
Coordination of the in situ payload of Solar Orbiter
Lewis, G. R.; Livi, S.; Müller, D. +36 more
Solar Orbiter's in situ coordination working group met frequently during the development of the mission with the goal of ensuring that its in situ payload has the necessary level of coordination to maximise science return. Here we present the results of that work, namely how the design of each of the in situ instruments (EPD, MAG, RPW, SWA) was gu…
Outer Radiation Belt Electron Lifetime Model Based on Combined Van Allen Probes and Cluster VLF Measurements
Aryan, Homayon; Boynton, Richard; Balikhin, Michael A. +4 more
The flux of energetic electrons in the outer radiation belt shows a high variability. The interactions of electrons with very low frequency (VLF) chorus waves play a significant role in controlling the flux variation of these particles. Quantifying the effects of these interactions is crucially important for accurately modeling the global dynamics…
Outside the Lyman-break box: detecting Lyman continuum emitters at 3.5 < z < 5.1 with CLAUDS
Ryan-Weber, E. V.; Arnouts, S.; Sawicki, M. +12 more
Identifying non-contaminated sample of high-redshift galaxies with escaping Lyman continuum (LyC) flux is important for understanding the sources and evolution of cosmic reionization. We present CLAUDS (CFHT Large Area u-band deep survey) u-band photometry of the COSMOS field to probe LyC radiation from spectroscopically confirmed galaxies at $z$ …
H2 emission in the low-ionization structures of the planetary nebulae NGC 7009 and NGC 6543
Gonçalves, Denise R.; Akras, Stavros; Ramos-Larios, Gerardo +1 more
Despite the many studies in the last decades, the low-ionization structures (LISs) of planetary nebulae (PNe) still hold several mysteries. Recent imaging surveys have demonstrated that LISs are composed of molecular gas. Here, we report H2 emission in the LISs of NGC 7009 and NGC 6543 by means of very deep narrow-band H2 ima…
Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko
Sierks, H.; Fulle, M.; Kührt, E. +25 more
Aims: We provide a measurement of the seasonal evolution of the dust deposit erosion and accretion in the Hapi region of comet 67P/Churyumov-Gerasimenko with a vertical accuracy of 0.2-0.9 m.
Methods: We used OSIRIS Narrow Angle Camera images with a spatial scale of lower than 1.30 m px-1 and developed a tool to monitor the ti…