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Characterizing Undetected Stellar Companions with Combined Data Sets
Kraus, Adam L.; Mann, Andrew W.; Wood, Mackenna L.
Binaries play a critical role in the formation, evolution, and fundamental properties of planets, stars, and stellar associations. Observational studies in these areas often include a mix of observations aimed at detecting or ruling out the presence of stellar companions. Rarely can nondetections rule out all possible binary configurations. Here w…
KMOS study of the mass accretion rate from Class I to Class II in NGC 1333
Fiorellino, Eleonora; Giannini, Teresa; Nisini, Brunella +6 more
Context. The mass accretion rate (\Mdot;acc) is the fundamental parameter to understand the process of mass assembly that results in the formation of a low-mass star. This parameter has been largely studied in Classical T Tauri stars in star-forming regions with ages of ∼1 − 10 Myr. However, little is known about the accretion propertie…
Powerful winds in high-redshift obscured and red quasars
Hamann, Fred; Veilleux, Sylvain; Zakamska, Nadia L. +10 more
Quasar-driven outflows must have made their most significant impact on galaxy formation during the epoch when massive galaxies were forming most rapidly. To study the impact of quasar feedback, we conducted rest-frame optical integral field spectrograph (IFS) observations of three extremely red quasars (ERQs) and one type-2 quasar at z = 2-3, obta…
Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD
Vandaele, Ann Carine; Aoki, Shohei; Liuzzi, Giuliano +15 more
The nucleation fraction of local volume galaxies
Neumayer, Nadine; Greene, Jenny E.; Seth, Anil C. +2 more
Nuclear star clusters (NSCs) are a common phenomenon in galaxy centres and are found in a vast majority of galaxies of intermediate stellar mass $\approx 10^9\, \mathrm{M}_{\odot }$. Recent investigations suggest that they are rarely found in the least and most massive galaxies and that the nucleation fraction increases in dense environments. It i…
Transient HCl in the atmosphere of Mars
Montmessin, Franck; Belyaev, Denis A.; Fedorova, Anna A. +23 more
A major quest in Mars' exploration has been the hunt for atmospheric gases, potentially unveiling ongoing activity of geophysical or biological origin. Here, we report the first detection of a halogen gas, HCl, which could, in theory, originate from contemporary volcanic degassing or chlorine released from gas-solid reactions. Our detections made …
A million asteroid observations in the Sloan Digital Sky Survey
Carry, Benoit; Sergeyev, Alexey V.
Context. The populations of small bodies of the Solar System (asteroids, comets, Kuiper-Belt objects) are used to constrain the origin and evolution of the Solar System. Both their orbital distribution and composition distribution are required to track the dynamical pathway from their regions of formation to their current locations.
Aims: We …
ALMA Lensing Cluster Survey: An ALMA Galaxy Signposting a MUSE Galaxy Group at z = 4.3 Behind "El Gordo"
Magdis, G. E.; Zitrin, A.; Grillo, C. +24 more
We report the discovery of a Multi Unit Spectroscopic Explorer (MUSE) galaxy group at z = 4.32 lensed by the massive galaxy cluster ACT-CL J0102-4915 (aka El Gordo) at z = 0.87, associated with a 1.2 mm source that is at a 2.07 ± 0.88 kpc projected distance from one of the group galaxies. Three images of the whole system appear in the image plane.…
The most massive white dwarfs in the solar neighbourhood
Bergeron, P.; Blouin, Simon; Kilic, Mukremin +1 more
We present an analysis of the most massive white dwarf candidates in the Montreal White Dwarf Database 100 pc sample. We identify 25 objects that would be more massive than $1.3\, {\rm M}_{\odot }$ if they had pure H atmospheres and CO cores, including two outliers with unusually high photometric mass estimates near the Chandrasekhar limit. We pro…
An Earth-mass planet in a time of COVID-19: KMT-2020-BLG-0414Lb
Maoz, Dan; Tan, Thiam-Guan; Han, Cheongho +58 more
We report the discovery of KMT-2020-BLG-0414Lb, with a planet-to-host mass ratio q 2 = 0.9-1.2 × 10-5 = 3-4 ⊕ at 1σ, which is the lowest mass-ratio microlensing planet to date. Together with two other recent discoveries (4 ≲ q/q ⊕ ≲ 6), it fills out the previous empty sector at the bottom of the triangular (log s, …