Search Publications
A search for intermediate-mass black holes in compact stellar systems through optical emissions from tidal disruption events
Norris, Mark A.; Pomeroy, Richard T.
Intermediate-mass black holes (IMBHs) are expected to exist in globular clusters (GCs) and compact stellar systems (CSSs) in general, but none have been conclusively detected. Tidal disruption events (TDEs), where a star is tidally disrupted by the gravitational field of a black hole, have been observed to occur around the supermassive black holes…
BepiColombo observations of cold oxygen and carbon ions in the flank of the induced magnetosphere of Venus
André, N.; Fedorov, A.; Krupp, N. +25 more
On 10 August 2021, the Mercury-bound BepiColombo spacecraft performed its second fly-by of Venus and provided a short-lived observation of its induced magnetosphere. Here we report results recorded by the Mass Spectrum Analyzer on board Mio, which reveal the presence of cold O+ and C+ with an average total flux of ~4 ± 1 × 10…
Properties of sunspot light bridges on a geometric height scale
Ruiz Cobo, B.; Asensio Ramos, A.; Esteban Pozuelo, S. +1 more
Context. Investigating light bridges (LBs) helps us comprehend key aspects of sunspots. However, few studies have analyzed the properties of LBs in terms of the geometric height, which is a more realistic perspective given the corrugation of the solar atmosphere. Aims. We aim to shed light on LBs by studying the variation in their physical propert…
Three young planets around the K-dwarf K2-198: high-energy environment, evaporation history, and expected future
Baratella, M.; Poppenhaeger, K.; Ilin, E. +1 more
Planets orbiting young stars are thought to experience atmospheric evaporation as a result of the host stars' high-magnetic activity. We study the evaporation history and expected future of the three known transiting exoplanets in the young multiplanet system K2-198. Based on spectroscopic and photometric measurements, we estimate an age of the K-…
Maser Investigation toward Off-Plane Stars (MIOPS): Detection of SiO Masers in the Galactic Thick Disk and Halo
Li, Juan; Gong, Yan; Menten, Karl M. +7 more
Studying stars that are located off the Galactic plane is important for understanding the formation history of the Milky Way. We searched for SiO masers toward off-plane O-rich asymptotic giant branch (AGB) stars from the catalog presented by Mauron et al. in order to shed light on the origins of these objects. A total of 102 stars were observed i…
Neglected Silicon Dioxide Polymorphs as Clouds in Substellar Atmospheres
Moran, Sarah E.; Marley, Mark S.; Crossley, Samuel D.
Direct mid-infrared signatures of silicate clouds in substellar atmospheres were first detected in Spitzer observations of brown dwarfs, although their existence was previously inferred from near-infrared spectra. With JWST's Mid-Infrared Instrument, we can now more deeply probe silicate features from 8 to 10 µm, exploring specific particle …
Studying the variability of fluorescence emission and the presence of clumpy wind in HMXB GX 301-2 using XMM-Newton
Paul, Biswajit; Roy, Kinjal; Manikantan, Hemanth
We present the results from an analysis of data from an XMM-Newton observation of the accreting high-mass X-ray binary pulsar GX 301-2. Spectral analysis in the non-flaring segment of the observation revealed that the equivalent width of the iron fluorescence emission is correlated with the observed absorption column density and the ratio of the i…
Spectroscopic Constraints on the Mid-infrared Attenuation Curve. I. Attenuation Model Using Polycyclic Aromatic Hydrocarbon Emission
Nakagawa, Takao; Baba, Shunsuke; Imanishi, Masatoshi +4 more
We introduce a novel model to spectroscopically constrain the mid-infrared (MIR) extinction/attenuation curve from 3–17 µm, using polycyclic aromatic hydrocarbon (PAH) emission drawn from an AKARI–Spitzer extragalactic cross-archival data set. Currently proposed MIR extinction curves vary significantly in their slopes toward the near-infrare…
CHEX-MATE: The intracluster medium entropy distribution in the gravity-dominated regime
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +26 more
We characterise the intracluster gas entropy profiles of 32 very high-mass (M500 > 7.75 × 1014 M⊙) Planck SZ-detected galaxy clusters (HIGHMz), selected from the CHEX-MATE sample, allowing us to study the intracluster medium (ICM) entropy distribution in a regime where non-gravitational effects are expected to b…
Lithium Abundances from the LAMOST Medium-resolution Survey Data Release 9
Gao, Qi; Shi, Jian-Rong; Li, Chun-Qian +9 more
Lithium is a fragile but crucial chemical element in the Universe, and exhibits interesting and complex behaviors. Thanks to the mass of spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution survey (MRS), we can investigate the lithium abundances in a large and diverse sample of stars, whi…