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Stellar multiplicity affects the correlation between protoplanetary disc masses and accretion rates: binaries explain high accretors in Upper Sco
Manara, Carlo F.; Zagaria, Francesco; Rosotti, Giovanni P. +1 more
In recent years, a correlation between mass accretion rates onto new-born stars and their protoplanetary disc masses was detected in nearby young star-forming regions. Although such a correlation can be interpreted as due to viscous-diffusion processes in the disc, highly accreting sources with low disc masses in more evolved regions remain puzzli…
The Magellanic Edges Survey - III. Kinematics of the disturbed LMC outskirts
Da Costa, G. S.; Belokurov, V.; Koposov, S. E. +3 more
We explore the structural and kinematic properties of the outskirts of the Large Magellanic Cloud (LMC) using data from the Magellanic Edges Survey (MagES) and Gaia EDR3. Even at large galactocentric radii (8° < R < 11°), we find the north-eastern LMC disc is relatively unperturbed: its kinematics are consistent with a disc of inclination ~3…
A Catalog of Early-type Hα Emission-line Stars and 62 Newly Confirmed Herbig Ae/Be Stars from LAMOST Data Release 7
Qin, Li; Luo, A. -Li; Hou, Wen +6 more
We derive a catalog of early-type emission-line stars including 30,023 spectra of 25,867 stars from LAMOST Data Release 7, in which 4189 have Simbad records. The spectra are classified into three morphological types (10 subtypes) based on Hα emission-line profiles. Some spectra contaminated by nebula emission lines such as from H II regions are fl…
Velocity dispersions of clusters in the Dark Energy Survey Y3 redMaPPer catalogue
Smith, M.; Lidman, C.; Davis, T. M. +97 more
We measure the velocity dispersions of clusters of galaxies selected by the red-sequence Matched-filter Probabilistic Percolation (redMaPPer) algorithm in the first three years of data from the Dark Energy Survey (DES), allowing us to probe cluster selection and richness estimation, λ, in light of cluster dynamics. Our sample consists of 126 clust…
A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system
Trifonov, Trifon; Hellier, Coel; Latham, David W. +47 more
It is commonly accepted that exoplanets with orbital periods shorter than one day, also known as ultra-short-period (USP) planets, formed further out within their natal protoplanetary disks before migrating to their current-day orbits via dynamical interactions. One of the most accepted theories suggests a violent scenario involving high-eccentric…
New Variable Hot Subdwarf Stars Identified from Anomalous Gaia Flux Errors, Observed by TESS, and Classified via Fourier Diagnostics
Hermes, J. J.; Lopez, Isaac D.; Kupfer, Thomas +7 more
Hot subdwarf stars are mostly stripped red giants that can exhibit photometric variations due to stellar pulsations, eclipses, the reflection effect, ellipsoidal modulation, and Doppler beaming. Detailed studies of their light curves help constrain stellar parameters through asteroseismological analyses or binary light-curve modeling and generally…
Bridging Optical and Far-infrared Emission-line Diagrams of Galaxies from Local to the Epoch of Reionization: Characteristic High [O III] 88 µm/SFR at z > 6
Harikane, Yuichi; Inoue, Akio K.; Hashimoto, Takuya +3 more
We present photoionization modeling of galaxy populations at z ∼ 0, 2, and >6 to bridge optical and far-infrared (FIR) emission-line diagrams. We collect galaxies with measurements of optical and/or FIR ([O III] 88 µm and [C II] 158 µm) emission-line fluxes and plot them on the [O III]λ5007/Hβ-[N II]λ6585/Hα (BPT) and L([O III]…
On the Neutron Star/Black Hole Mass Gap and Black Hole Searches
Shao, Yong
Mass distribution of black holes in low-mass X-ray binaries previously suggested the existence of a ~2-5 M ⊙ mass gap between the most massive neutron stars and the least massive black holes, while some recent evidence appears to support that this mass gap is being populated. Whether there is a mass gap or not can potentially shed light…
Binary parameters from astrometric and spectroscopic errors - candidate hierarchical triples and massive dark companions in Gaia DR3
Belokurov, Vasily; Evans, N. Wyn; Andrew, Shion +2 more
We show how astrometric and spectroscopic errors introduced by an unresolved binary system can be combined to give estimates of the binary period and mass ratio. This can be performed analytically if we assume we see one or more full orbits over our observational baseline, or numerically for all other cases. We apply this method to Gaia DR3 data, …
Modeling the 2020 November 29 solar energetic particle event using EUHFORIA and iPATH models
Li, Gang; Poedts, Stefaan; Ding, Zheyi +1 more
Aims: We present the implementation of a coupling between EUropean Heliospheric FORcasting Information Asset (EUHFORIA) and improved Particle Acceleration and Transport in the Heliosphere (iPATH) models. In this work, we simulate the widespread solar energetic particle (SEP) event of 2020 November 29 and compare the simulated time-intensity p…