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CHEOPS finds KELT-1b darker than expected in visible light. Discrepancy between the CHEOPS and TESS eclipse depths
Guterman, P.; Alonso, R.; Deleuil, M. +78 more
Recent studies based on photometry from the Transiting Exoplanet Survey Satellite (TESS) have suggested that the dayside of KELT-1b, a strongly irradiated brown dwarf, is significantly brighter in visible light than what would be expected based on Spitzer observations in the infrared. We observed eight eclipses of KELT-1b with CHaracterising ExOPl…
The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation
Hermes, J. J.; Blouin, Simon; Zakamska, Nadia L. +12 more
A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary star explodes, the surviving donor can be spontaneously released as a hypervelocity runaway. One such runaway donor candidate is LP 398-9, whose orbital trajectory trac…
The (Black Hole Mass)-(Spheroid Stellar Density) Relations: M BH-µ (and M BH-Σ) and M BH-ρ
Graham, Alister W.; Davis, Benjamin L.; Sahu, Nandini
This paper is the fourth in a series presenting (galaxy morphology, and thus galaxy formation)-dependent black hole (BH) mass, M BH, scaling relations. We have used a sample of 119 galaxies with directly measured M BH and host spheroid parameters obtained from multicomponent decomposition of, primarily, 3.6 µm Spitzer i…
Stellar feedback in M83 as observed with MUSE. I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas
Della Bruna, Lorenza; Robert, Carmelle; Rousseau-Nepton, Laurie +14 more
Context. Young massive stars inject energy and momentum into the surrounding gas, creating a multi-phase interstellar medium (ISM) and regulating further star formation. The main challenge of studying stellar feedback proves to be the variety of scales spanned by this phenomenon, ranging from the immediate surrounding of the stars (H II regions, 1…
The CARMENES search for exoplanets around M dwarfs. Rotational variation in activity indicators of Ross 318, YZ CMi, TYC 3529-1437-1, and EV Lac
Amado, P. J.; Bauer, F. F.; Caballero, J. A. +22 more
Context. The Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Échelle Spectrographs (CARMENES) instrument is searching for periodic radial-velocity (RV) variations of M dwarfs, which are induced by orbiting planets. However, there are other potential sources of such variations, including rotational modu…
The VLT-FLAMES Tarantula Survey. Observational evidence for two distinct populations of massive runaway stars in 30 Doradus
van Loon, J. Th.; Crowther, P. A.; Lennon, D. J. +17 more
Context. The origin of massive runaway stars is an important unsolved problem in astrophysics. Two main scenarios have been proposed, namely: dynamical ejection or release from a binary at the first core collapse. However, their relative contribution remains heavily debated.
Aims: Taking advantage of two large spectroscopic campaigns towards …
Transit timing variations of AU Microscopii b and c
Alonso, R.; Deleuil, M.; Erikson, A. +76 more
Here we report large-amplitude transit timing variations (TTVs) for AU Microcopii b and c as detected in combined TESS (2018, 2020) and CHEOPS (2020, 2021) transit observations. AU Mic is a young planetary system with a debris disk and two transiting warm Neptunes. A TTV on the order of several minutes was previously reported for AU Mic b, which w…
Peculiar Radio-X-Ray Relationship in Active Stars
Ray, T. P.; Callingham, J. R.; Shimwell, T. W. +5 more
The empirical relationship between the nonthermal 5 GHz radio luminosity and the soft X-ray luminosity of active stellar coronae, canonically called the Güdel-Benz relationship, has been a cornerstone of stellar radio astronomy, as it explicitly ties the radio emission to the coronal heating mechanisms. The relationship extends from microflares on…
Surface magnetism of rapidly rotating red giants: Single versus close binary stars
Yu, Jie; Gaulme, Patrick; Gehan, Charlotte
According to dynamo theory, stars with convective envelopes efficiently generate surface magnetic fields, which manifest as magnetic activity in the form of starspots, faculae, and/or flares, when their rotation period is shorter than their convective turnover time. Most red giants, having undergone significant spin down while expanding, have slow…
EXORCISM: A Spectroscopic Survey of Young Eruptive Variables (EXor and Candidates)
Rossi, A.; Testa, V.; Lorenzetti, D. +9 more
We present an optical/near-IR survey of 11 variable young stars (EXors and EXor candidates) aimed at deriving and monitoring their accretion properties. About 30 optical and near-infrared spectra ( ${\mathfrak{R}}\sim 1500\mbox{--}2000$ ) were collected between 2014 and 2019 with the Large Binocular Telescope (LBT). From the spectral analysis we h…