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Coronal Mass Ejections and Type II Radio Emission Variability during a Magnetic Cycle on the Solar-type Star ϵ Eridani
Ó Fionnagáin, Dúalta; Kavanagh, Robert D.; Vidotto, Aline A. +5 more
We simulate possible stellar coronal mass ejection (CME) scenarios over the magnetic cycle of ϵ Eridani (18 Eridani; HD 22049). We use three separate epochs from 2008, 2011, and 2013, and estimate the radio emission frequencies associated with these events. These stellar eruptions have proven to be elusive, although a promising approach to detect …
KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant
Borkovits, Tamás; Miglio, Andrea; Appourchaux, Thierry +13 more
KIC 7955301 is a hierarchical triple system with clear eclipse timing and depth variations that was discovered by the Kepler satellite during its original mission. It is composed of a non-eclipsing primary star at the bottom of the red giant branch (RGB) on a 209-day orbit with a K/G-type main-sequence (MS) inner eclipsing binary (EB), orbiting in…
Radio monitoring of transient Be/X-ray binaries and the inflow-outflow coupling of strongly magnetized accreting neutron stars
Degenaar, N.; Wijnands, R.; Miller-Jones, J. C. A. +5 more
Strongly magnetized (B ≥ 1012 G) accreting neutron stars (NSs) are prime targets for studying the launching of jets by objects with a solid surface; while classical jet-launching models predict that such NSs cannot launch jets, recent observations and models argue otherwise. Transient Be/X-ray binaries (BeXRBs) are critical laboratories…
TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant
Trifonov, Trifon; Lester, Kathryn V.; Latham, David W. +41 more
The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritize the thousands of transiting planet candidates for follow-up characterization. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from MINERV…
Sh 2-301: A Blistered H II Region Undergoing Star Formation
Pandey, Rakesh; Sharma, Saurabh; Panwar, Neelam +6 more
We present a multiwavelength study of the H II region Sh 2-301 (S301) using deep optical data, near-infrared data, radio continuum data, and other archival data at longer wavelengths. A cluster of young stellar objects (YSOs) is identified in the northeast (NE) direction of S301. The Hα and radio continuum images trace the distribution of the ioni…
AT2020hur: A Possible Optical Counterpart of FRB 180916B
Dai, Zi-Gao; Li, Long; Li, Qiao-Chu +4 more
The physical origin of fast radio bursts (FRBs) remains unclear. Finding multiwavelength counterparts of FRBs can provide a breakthrough for understanding their nature. In this work, we perform a systematic search for astronomical transients whose positions are consistent with FRBs. We find an unclassified optical transient AT2020hur (α = 01h…
Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy
Ueda, Yoshihiro; Terashima, Yuichi; Matsuhara, Hideo +13 more
We report optical spectroscopic observations of four blue-excess dust-obscured galaxies (BluDOGs) identified by the Subaru Hyper Suprime-Cam. BluDOGs are a subclass of dust-obscured galaxies (DOGs; defined with the extremely red color (i - [22])AB ≥ 7.0; Toba et al., showing a significant flux excess in the optical g and r bands over th…
Discovery of strongly lensed quasars in the Ultraviolet Near Infrared Optical Northern Survey (UNIONS)
Fabbro, S.; Gavazzi, R.; Cuillandre, J. -C. +13 more
We report the discovery of five new doubly imaged lensed quasars from the first 2500 square degrees of the ongoing Canada-France Imaging Survey (CFIS), which is a component of the Ultraviolet Near Infrared Optical Northern Survey. The systems are preselected in the initial catalogues of either Gaia pairs or MILLIQUAS quasars. We then take advantag…
Thermal Tides in the Martian Atmosphere Near Northern Summer Solstice Observed by ACS/TIRVIM Onboard TGO
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +8 more
Thermal tides in the Martian atmosphere are analyzed using temperature profiles retrieved from nadir observations obtained by the TIRVIM Fourier-spectrometer, part of the Atmospheric Chemistry Suite onboard the ExoMars Trace Gas Orbiter. The data is selected near the northern summer solstice at solar longitude (LS) 75°-105° of Martian Y…
The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +109 more
We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M* = 1.109 ± 0.043M⊙, R* = 1.043 ± 0.009 R⊙) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 ground-based photometry, `Alopeke and PHARO high-resolution imaging, TRES and…