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The 'Giraffe': discovery of a stripped red giant in an interacting binary with an 2 M⊙ lower giant
Ilyin, I.; Kochanek, C. S.; Badenes, C. +13 more
We report the discovery of a stripped giant + lower giant Algol-type binary, 2M04123153+6738486 (2M0412), identified during a search for non-interacting compact object - star binaries. 2M0412 is an evolved (Teff, giant ≃ 4000 K), luminous (Lgiant ≃ 150 L⊙) red giant in a circular P = 81.2 d binary. 2M0412 is a know…
Progenitor, environment, and modelling of the interacting transient AT 2016jbu (Gaia16cfr)
Sollerman, J.; Reichart, D. E.; Harrison, D. L. +67 more
We present the bolometric light curve, identification and analysis of the progenitor candidate, and preliminary modelling of AT 2016jbu (Gaia16cfr). We find a progenitor consistent with a ~ 22-25 M⊙ yellow hypergiant surrounded by a dusty circumstellar shell, in agreement with what has been previously reported. We see evidence for signi…
A novel black hole mass scaling relation based on coronal gas, and its dependence with the accretion disc
Panda, Swayamtrupta; Rodríguez-Ardila, Alberto; Marinello, Murilo +1 more
Using bona-fide black hole (BH) mass estimates from reverberation mapping and the line ratio [Si VI] 1.963$\rm{\mu m}$/Brγbroad as tracer of the AGN ionizing continuum, a novel BH-mass scaling relation of the form log(MBH) = (6.40 ± 0.17) - (1.99 ± 0.37) × log ([Si VI]/Brγbroad), dispersion 0.47 dex, over the BH ma…
Current Challenges in Cepheid Distance Calibrations Using Gaia Early Data Release 3
Madore, Barry F.; Freedman, Wendy L.; Lee, Abigail J. +1 more
Using parallaxes from Gaia Early Data Release 3 (EDR3), we determine multi-wavelength BVI c , JHK s , and [3.6] and [4.5] micron absolute magnitudes for 37 nearby Milky Way Cepheids, covering the period range between 5 and 60 days. We apply these period-luminosity relations to Cepheids in the Large and Small Magellanic Clou…
AGN impact on the molecular gas in galactic centres as probed by CO lines
Vallini, Livia; Mingozzi, Matilde; Vignali, Cristian +5 more
We present a detailed analysis of the X-ray, infrared, and carbon monoxide (CO) emission for a sample of 35 local (z ≤ 0.15), active (LX ≥ 1042 erg s-1) galaxies. Our goal is to infer the contribution of far-ultraviolet (FUV) radiation from star formation (SF), and X-ray radiation from the active galactic nuclei (A…
Turbulence in the Outer Heliosphere
Zank, Gary P.; Adhikari, Laxman; Zhao, Lingling +9 more
The solar wind (SW) and local interstellar medium (LISM) are turbulent media. Their interaction is governed by complex physical processes and creates heliospheric regions with significantly different properties in terms of particle populations, bulk flow and turbulence. Our knowledge of the solar wind turbulence nature and dynamics mostly relies o…
TOI-3884 b: A rare 6-RE planet that transits a low-mass star with a giant and likely polar spot
Bouchy, F.; Bonfils, X.; Ciardi, D. R. +19 more
The Transiting Exoplanet Survey Satellite mission identified a deep and asymmetric transit-like signal with a periodicity of 4.5 days orbiting the M4 dwarf star TOI-3884. The signal has been confirmed by follow-up observations collected by the ExTrA facility and Las Cumbres Observatory Global Telescope, which reveal that the transit is chromatic. …
Detection of 2460 double-lined spectroscopic binary candidates in the LAMOST-MRS using projected rotational velocities and a binary spectral model
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei
We present a new method for the detection of double-lined spectroscopic binaries (SB2s) using Vsin i values from spectral fits. The method is tested on synthetic and real spectra from the Large Sky Area Multi-Object fiber Spectroscopic Telescope Medium Resolution Survey. It can reliably detect SB2 candidates for double-lined binaries with $V \sin …
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
Mendes, L.; Russano, G.; Nofrarias, M. +79 more
We present an in depth analysis of the transient events, or glitches, detected at a rate of about one per day in the differential acceleration data of LISA Pathfinder. We show that these glitches fall in two rather distinct categories: fast transients in the interferometric motion readout on one side, and true force transient events on the other. …
A solar coronal loop in a box: Energy generation and heating
Peter, H.; Chitta, L. P.; Solanki, S. K. +4 more
Context. Coronal loops are the basic building block of the upper solar atmosphere as seen in the extreme UV and X-rays. Comprehending how these are energized, structured, and evolve is key to understanding stellar coronae.
Aims: Here we investigate how the energy to heat the loop is generated by photospheric magneto-convection, transported in…