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Radio fossils, relics, and haloes in Abell 3266: cluster archaeology with ASKAP-EMU and the ATCA
Diego, J. M.; Tasse, C.; Eckert, D. +21 more
Abell 3266 is a massive and complex merging galaxy cluster that exhibits significant substructure. We present new, highly sensitive radio continuum observations of Abell 3266 performed with the Australian Square Kilometre Array Pathfinder (0.8-1.1 GHz) and the Australia Telescope Compact Array (1.1-3.1 GHz). These deep observations provide new ins…
New low mass ratio contact binaries in the Catalina Sky Survey
Ferreira Lopes, C. E.; Drake, Andrew J.; Catelan, Márcio +3 more
We present the identification and photometric analysis of 30 new low mass ratio (LMR) totally eclipsing contact binaries found in Catalina Sky Survey data. The LMR candidates are identified using Fourier coefficients and visual inspection. We perform a detailed scan in the parameter plane of mass ratio (q) versus inclination (i) using PHOEBE -0.31…
Detection of δ Scuti Pulsators in the Eclipsing Binaries Observed by TESS
Zhang, Xiaobin; Xiong, Jianping; Ji, Kaifan +6 more
Based on 2 minute cadence TESS data from sectors 1-50, we report the results of the systematic extraction of δ Scuti-type pulsations in the 6431 eclipsing binaries with orbital periods shorter than 13 days. A total number of 242 pulsators were found in those systems, including 143 new discoveries. We examined their pulsation properties based on th…
Six new compact triply eclipsing triples found with TESS
Mitnyan, T.; Pál, A.; Vanderburg, A. +21 more
In this work, we report the discovery and analysis of six new compact triply eclipsing triple star systems found with the TESS mission: TICs 37743815, 42565581, 54060695, 178010808, 242132789, and 456194776. All of these exhibit distinct third-body eclipses where the inner eclipsing binary (EB) occults the third ('tertiary') star, or vice versa. W…
The Rapid X-Ray and UV Evolution of ASASSN-14ko
Lin, Chien-Cheng; Holoien, Thomas W. -S.; Auchettl, Katie +13 more
ASASSN-14ko is a recently discovered periodically flaring transient at the center of the active galactic nucleus (AGN) ESO 253-G003 with a slowly decreasing period. Here, we show that the flares originate from the northern, brighter nucleus in this dual-AGN, post-merger system. The light curves for the two flares that occurred in 2020 May and Sept…
Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
Guterman, P.; Alonso, R.; Deleuil, M. +115 more
We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of four transiting planets, namely TOI-561 b (P = 0.45 d, R = 1.42 R⊕, M = 2.0 M⊕)…
Shock cooling of a red-supergiant supernova at redshift 3 in lensed images
Filippenko, Alexei V.; Kelly, Patrick L.; Oguri, Masamune +6 more
The core-collapse supernova of a massive star rapidly brightens when a shock, produced following the collapse of its core, reaches the stellar surface. As the shock-heated star subsequently expands and cools, its early-time light curve should have a simple dependence on the size of the progenitor1 and therefore final evolutionary state.…
The evolution of CNO elements in galaxies
Romano, Donatella
After hydrogen and helium, oxygen, carbon, and nitrogen—hereinafter, the CNO elements—are the most abundant species in the universe. They are observed in all kinds of astrophysical environments, from the smallest to the largest scales, and are at the basis of all known forms of life, hence, the constituents of any biomarker. As such, their study p…
PHANGS-HST: new methods for star cluster identification in nearby galaxies
White, Richard L.; Kruijssen, J. M. Diederik; Rosolowsky, Erik +14 more
We present an innovative and widely applicable approach for the detection and classification of stellar clusters, developed for the PHANGS-HST Treasury Program, an NUV-to-I band imaging campaign of 38 spiral galaxies. Our pipeline first generates a unified master source list for stars and candidate clusters, to enable a self-consistent inventory o…
Discovery of post-mass-transfer helium-burning red giants using asteroseismology
Wu, Yaqian; Bi, Shaolan; Li, Yaguang +14 more
A star expands to become a red giant when it has fused all the hydrogen in its core into helium. If the star is in a binary system, its envelope can overflow onto its companion or be ejected into space, leaving a hot core and potentially forming a subdwarf B star1-3. However, most red giants that have partially transferred envelopes in …