Search Publications
The reduced proper motion selected halo: Methods and description of the catalogue
Helmi, Amina; Koppelman, Helmer H.
Context. The Gaia mission has provided the largest ever astrometric chart of the Milky Way. Using it to map the Galactic halo is helpful for disentangling its merger history.
Aims: The identification of halo stars in Gaia DR2 with reliable distance estimates requires special methods because such stars are typically farther away and scarce.
Three faint-source microlensing planets detected via the resonant-caustic channel
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
Aims: We conducted a project of reinvestigating the 2017-2019 microlensing data collected by high-cadence surveys with the aim of finding planets that were missed due to the deviations of planetary signals from the typical form of short-term anomalies.
Methods: The project led us to find three planets, KMT-2017-BLG-2509Lb, OGLE-2017-BLG-…
Blue extreme disk-runaway stars with Gaia EDR3
Raddi, Roberto; Irrgang, Andreas; Heber, Ulrich +1 more
Since the discovery of hypervelocity stars in 2005, it has been widely believed that only the disruption of a binary system by a supermassive black hole at the Galactic center (GC), that is, the so-called Hills mechanism, is capable of accelerating stars to beyond the Galactic escape velocity. In the meantime, however, driven by the Gaia space mis…
Atacama Cosmology Telescope measurements of a large sample of candidates from the Massive and Distant Clusters of WISE Survey. Sunyaev-Zeldovich effect confirmation of MaDCoWS candidates using ACT
Hilton, Matt; Sifón, Cristóbal; Choi, Steve K. +35 more
Context. Galaxy clusters are an important tool for cosmology, and their detection and characterization are key goals for current and future surveys. Using data from the Wide-field Infrared Survey Explorer (WISE), the Massive and Distant Clusters of WISE Survey (MaDCoWS) located 2839 significant galaxy overdensities at redshifts 0.7 ≲ z ≲ 1.5, whic…
The MUSE Hubble Ultra Deep Field Survey. XVI. The angular momentum of low-mass star-forming galaxies: A cautionary tale and insights from TNG50
Bacon, Roland; Contini, Thierry; Richard, Johan +14 more
We investigate the specific angular momentum (sAM) j(< r) profiles of intermediate redshift (0.4 < z < 1.4) star-forming galaxies (SFGs) in the relatively unexplored regime of low masses (down to M⋆ ∼ 108 M⊙) and small sizes (down to Re ∼ 1.5 kpc), and we characterize the sAM scaling relation (i…
A multiwavelength analysis of the spiral arms in the protoplanetary disk around WaOph 6
Ménard, F.; Ginski, C.; Garufi, A. +23 more
Context. In recent years, protoplanetary disks with spiral structures have been detected in scattered light, millimeter continuum, and CO gas emission. The mechanisms causing these structures are still under debate. A popular scenario to drive the spiral arms is the one of a planet perturbing the material in the disk. However, if the disk is massi…
V-band photometry of asteroids from ASAS-SN. Finding asteroids with slow spin
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +3 more
We present V-band photometry of the 20 000 brightest asteroids using data from the All-Sky Automated Survey for Supernovae (ASAS-SN) between 2012 and 2018. We were able to apply the convex inversion method to more than 5000 asteroids with more than 60 good measurements in order to derive their sidereal rotation periods, spin axis orientations, and…
The baryon cycle of Seven Dwarfs with superbubble feedback
Madau, Piero; Mayer, Lucio; Mina, Mattia +3 more
We present results from a high-resolution, cosmological, ΛCDM simulation of a group of field dwarf galaxies with the "superbubble" model for clustered SN feedback, accounting for thermal conduction and cold gas evaporation. We compared our results to a previous simulation which has the same initial condition and galaxy formation physics (other tha…
Launching the asymmetric bipolar jet of DO Tau
Bacciotti, F.; Fedele, D.; Coffey, D. +5 more
Context. The role of bipolar jets in the formation of stars, and in particular how they are launched, is still not well understood.
Aims: We probe the protostellar jet launching mechanism using high-resolution observations of the near-infrared (IR) [Fe II]λ1.53,1.64 µm emission lines.
Methods: We consider the case of the bipolar je…
The far reaches of the β Pictoris debris disk
Janson, Markus; Brandeker, Alexis; Olofsson, Göran +1 more
The nearby young star β Pictoris hosts a rich and complex planetary system, with at least two giant planets and a nearly edge-on debris disk that contains several dynamical subpopulations of planetesimals. While the inner ranges of the debris disk have been studied extensively, less information is known about the outer, fainter parts of the disk. …